Severe Storms

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0100 AM CDT Mon Aug 12 2019 Valid 131200Z - 141200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS OVER A PORTION OF THE MIDDLE ATLANTIC REGION... ...SUMMARY... Severe storms are expected Tuesday afternoon and early evening over the Middle Atlantic into southern portion of the Ohio Valley. Other strong to severe storms are possible over the Tennessee Valley and the central High Plains. ...Middle Atlantic and southern Ohio Valley regions... A convectively enhanced vorticity maximum embedded within a broad upper trough should reach OH by 12Z Tuesday, and this feature will continue east into the Northeast States and the northern portion of the Mid Atlantic during the day. At the start of the period a cold front will extend from a weak low over IN southwestward into northern TX. A warm or stationary front will stretch eastward from the low into southern PA. Storms will likely be ongoing from OH to western PA within zone of isentropic ascent north of stationary front. South of this activity, diabatic warming of the moistening surface layer will result in moderate instability with 1500-2000 J/kg MLCAPE expected. Additional storms should develop by late morning or afternoon in vicinity of the warm front across southern PA and northern VA, as well as farther south and west over the higher terrain and spread eastward into the warm sector. The NAM indicates the strongest kinematic environment, but might be overdone with convective feedback. Nevertheless, this region will reside within belt of moderate westerlies with 30-40 kt effective bulk shear supportive of organized storms including supercells. If enough destabilization can occur along the warm front, low-level hodographs may become supportive of a few tornadoes. Otherwise damaging wind will be the main threat. Other storms are expected to develop along southwestern extension of the cold front, especially from KY into the TN Valley during the afternoon where both the thermodynamic and kinematic parameter space should support mostly multicells and line segments with damaging wind the main threats. ...Central High Plains... A few storms are expected to develop along a lee trough and higher terrain within an evolving easterly post-frontal regime across the central High Plains. Modest low-level moisture beneath steep lapse rates will support up to 2000 j/kg MLCAPE, and this region will reside within belt of modest northwesterly winds aloft with 30-35 effective bulk shear. This environment may support a few instances of large hail and strong wind gusts before activity weakens by mid evening. Due to uncertainties regarding storm coverage will leave MRGL this update, but this region will continue to be monitored for a possible SLGT risk in later outlooks. ...Upper Mississippi Valley region... Isolated storms may develop over the upper Midwest in association with a southeast-advancing shortwave trough and within a weakly unstable environment. A belt of stronger unidirectional winds aloft will support up to 40 kt effective bulk shear. A few storms could produce locally strong wind gusts and hail, but overall threat should remain marginal. ...MAXIMUM RISK BY HAZARD... Tornado: 5% - Slight Wind: 30% - Enhanced Hail: 15% - Slight ..Dial.. 08/12/2019 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1235 AM CDT Mon Aug 12 2019 Valid 121200Z - 131200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM SOUTHEAST IA TO CENTRAL IL... ...SUMMARY... Severe thunderstorms are likely today over the middle Mississippi Valley to the Ohio Valley. Damaging gusts are the primary risk but a few tornadoes are possible. ...Mid MS/OH Valley Region... An impressive amount of deep convection has developed over the central Plains early this morning ahead of a disturbance that should approach western IA by sunrise. A reservoir of untapped buoyancy currently extends ahead of the MCS over eastern KS which should aid eastward progression of organized convection into the beginning of the upcoming day1 period. Latest NAM model guidance suggests leading edge of this activity will be near the MO River at sunrise; however, current speed/movement of the convection is considerably faster and storms could advance into western IA by 09z. It's not entirely clear whether the MCS will slow its forward propagation so confidence in timing/placement of this complex of storms is somewhat in doubt. Current outlook is predicated on MCS slowing a bit toward sunrise. For these reasons have adjusted severe probs west across IA/northern MO to account for possible severe at the beginning of the period. If boundary layer is able to warm/destabilize ahead of this activity, as NAM currently depicts, environmental parameters would seem supportive of organized convection continuing downstream, with some upward evolution expected by late morning. If convection maintains MCS structure then damaging winds will be the primary threat. However, forecast soundings across southeast IA into west-central IL exhibit favorable CAPE/shear for supercells and possible tornadoes. Will introduce low tornado probs to account for possible discrete updrafts by early afternoon. ...Eastern Dakotas... Early-morning water-vapor imagery depicts a well-defined short-wave trough over MT/WY shifting east toward the northern Plains. This feature is forecast to advance into the western Dakotas by 13/00z where it should aid scattered convection along/ahead of progressive wind shift. Hail/wind are the primary risks with scattered storms later today. ...ME... Weak mid-level height falls are forecast to spread south across ME later Monday. Deep westerly flow should allow boundary layer to warm such that inhibition is removed by 17z ahead of a zone of weak low-level confluence. Isolated thunderstorms are expected to develop across northern New England within a flow regime that could support storm organization capable of producing isolated damaging wind gusts. ..Darrow/Cook.. 08/12/2019 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1235 AM CDT Mon Aug 12 2019 Valid 121200Z - 131200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM SOUTHEAST IA TO CENTRAL IL... ...SUMMARY... Severe thunderstorms are likely today over the middle Mississippi Valley to the Ohio Valley. Damaging gusts are the primary risk but a few tornadoes are possible. ...Mid MS/OH Valley Region... An impressive amount of deep convection has developed over the central Plains early this morning ahead of a disturbance that should approach western IA by sunrise. A reservoir of untapped buoyancy currently extends ahead of the MCS over eastern KS which should aid eastward progression of organized convection into the beginning of the upcoming day1 period. Latest NAM model guidance suggests leading edge of this activity will be near the MO River at sunrise; however, current speed/movement of the convection is considerably faster and storms could advance into western IA by 09z. It's not entirely clear whether the MCS will slow its forward propagation so confidence in timing/placement of this complex of storms is somewhat in doubt. Current outlook is predicated on MCS slowing a bit toward sunrise. For these reasons have adjusted severe probs west across IA/northern MO to account for possible severe at the beginning of the period. If boundary layer is able to warm/destabilize ahead of this activity, as NAM currently depicts, environmental parameters would seem supportive of organized convection continuing downstream, with some upward evolution expected by late morning. If convection maintains MCS structure then damaging winds will be the primary threat. However, forecast soundings across southeast IA into west-central IL exhibit favorable CAPE/shear for supercells and possible tornadoes. Will introduce low tornado probs to account for possible discrete updrafts by early afternoon. ...Eastern Dakotas... Early-morning water-vapor imagery depicts a well-defined short-wave trough over MT/WY shifting east toward the northern Plains. This feature is forecast to advance into the western Dakotas by 13/00z where it should aid scattered convection along/ahead of progressive wind shift. Hail/wind are the primary risks with scattered storms later today. ...ME... Weak mid-level height falls are forecast to spread south across ME later Monday. Deep westerly flow should allow boundary layer to warm such that inhibition is removed by 17z ahead of a zone of weak low-level confluence. Isolated thunderstorms are expected to develop across northern New England within a flow regime that could support storm organization capable of producing isolated damaging wind gusts. ..Darrow/Cook.. 08/12/2019 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1235 AM CDT Mon Aug 12 2019 Valid 121200Z - 131200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM SOUTHEAST IA TO CENTRAL IL... ...SUMMARY... Severe thunderstorms are likely today over the middle Mississippi Valley to the Ohio Valley. Damaging gusts are the primary risk but a few tornadoes are possible. ...Mid MS/OH Valley Region... An impressive amount of deep convection has developed over the central Plains early this morning ahead of a disturbance that should approach western IA by sunrise. A reservoir of untapped buoyancy currently extends ahead of the MCS over eastern KS which should aid eastward progression of organized convection into the beginning of the upcoming day1 period. Latest NAM model guidance suggests leading edge of this activity will be near the MO River at sunrise; however, current speed/movement of the convection is considerably faster and storms could advance into western IA by 09z. It's not entirely clear whether the MCS will slow its forward propagation so confidence in timing/placement of this complex of storms is somewhat in doubt. Current outlook is predicated on MCS slowing a bit toward sunrise. For these reasons have adjusted severe probs west across IA/northern MO to account for possible severe at the beginning of the period. If boundary layer is able to warm/destabilize ahead of this activity, as NAM currently depicts, environmental parameters would seem supportive of organized convection continuing downstream, with some upward evolution expected by late morning. If convection maintains MCS structure then damaging winds will be the primary threat. However, forecast soundings across southeast IA into west-central IL exhibit favorable CAPE/shear for supercells and possible tornadoes. Will introduce low tornado probs to account for possible discrete updrafts by early afternoon. ...Eastern Dakotas... Early-morning water-vapor imagery depicts a well-defined short-wave trough over MT/WY shifting east toward the northern Plains. This feature is forecast to advance into the western Dakotas by 13/00z where it should aid scattered convection along/ahead of progressive wind shift. Hail/wind are the primary risks with scattered storms later today. ...ME... Weak mid-level height falls are forecast to spread south across ME later Monday. Deep westerly flow should allow boundary layer to warm such that inhibition is removed by 17z ahead of a zone of weak low-level confluence. Isolated thunderstorms are expected to develop across northern New England within a flow regime that could support storm organization capable of producing isolated damaging wind gusts. ..Darrow/Cook.. 08/12/2019 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1235 AM CDT Mon Aug 12 2019 Valid 121200Z - 131200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM SOUTHEAST IA TO CENTRAL IL... ...SUMMARY... Severe thunderstorms are likely today over the middle Mississippi Valley to the Ohio Valley. Damaging gusts are the primary risk but a few tornadoes are possible. ...Mid MS/OH Valley Region... An impressive amount of deep convection has developed over the central Plains early this morning ahead of a disturbance that should approach western IA by sunrise. A reservoir of untapped buoyancy currently extends ahead of the MCS over eastern KS which should aid eastward progression of organized convection into the beginning of the upcoming day1 period. Latest NAM model guidance suggests leading edge of this activity will be near the MO River at sunrise; however, current speed/movement of the convection is considerably faster and storms could advance into western IA by 09z. It's not entirely clear whether the MCS will slow its forward propagation so confidence in timing/placement of this complex of storms is somewhat in doubt. Current outlook is predicated on MCS slowing a bit toward sunrise. For these reasons have adjusted severe probs west across IA/northern MO to account for possible severe at the beginning of the period. If boundary layer is able to warm/destabilize ahead of this activity, as NAM currently depicts, environmental parameters would seem supportive of organized convection continuing downstream, with some upward evolution expected by late morning. If convection maintains MCS structure then damaging winds will be the primary threat. However, forecast soundings across southeast IA into west-central IL exhibit favorable CAPE/shear for supercells and possible tornadoes. Will introduce low tornado probs to account for possible discrete updrafts by early afternoon. ...Eastern Dakotas... Early-morning water-vapor imagery depicts a well-defined short-wave trough over MT/WY shifting east toward the northern Plains. This feature is forecast to advance into the western Dakotas by 13/00z where it should aid scattered convection along/ahead of progressive wind shift. Hail/wind are the primary risks with scattered storms later today. ...ME... Weak mid-level height falls are forecast to spread south across ME later Monday. Deep westerly flow should allow boundary layer to warm such that inhibition is removed by 17z ahead of a zone of weak low-level confluence. Isolated thunderstorms are expected to develop across northern New England within a flow regime that could support storm organization capable of producing isolated damaging wind gusts. ..Darrow/Cook.. 08/12/2019 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1235 AM CDT Mon Aug 12 2019 Valid 121200Z - 131200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM SOUTHEAST IA TO CENTRAL IL... ...SUMMARY... Severe thunderstorms are likely today over the middle Mississippi Valley to the Ohio Valley. Damaging gusts are the primary risk but a few tornadoes are possible. ...Mid MS/OH Valley Region... An impressive amount of deep convection has developed over the central Plains early this morning ahead of a disturbance that should approach western IA by sunrise. A reservoir of untapped buoyancy currently extends ahead of the MCS over eastern KS which should aid eastward progression of organized convection into the beginning of the upcoming day1 period. Latest NAM model guidance suggests leading edge of this activity will be near the MO River at sunrise; however, current speed/movement of the convection is considerably faster and storms could advance into western IA by 09z. It's not entirely clear whether the MCS will slow its forward propagation so confidence in timing/placement of this complex of storms is somewhat in doubt. Current outlook is predicated on MCS slowing a bit toward sunrise. For these reasons have adjusted severe probs west across IA/northern MO to account for possible severe at the beginning of the period. If boundary layer is able to warm/destabilize ahead of this activity, as NAM currently depicts, environmental parameters would seem supportive of organized convection continuing downstream, with some upward evolution expected by late morning. If convection maintains MCS structure then damaging winds will be the primary threat. However, forecast soundings across southeast IA into west-central IL exhibit favorable CAPE/shear for supercells and possible tornadoes. Will introduce low tornado probs to account for possible discrete updrafts by early afternoon. ...Eastern Dakotas... Early-morning water-vapor imagery depicts a well-defined short-wave trough over MT/WY shifting east toward the northern Plains. This feature is forecast to advance into the western Dakotas by 13/00z where it should aid scattered convection along/ahead of progressive wind shift. Hail/wind are the primary risks with scattered storms later today. ...ME... Weak mid-level height falls are forecast to spread south across ME later Monday. Deep westerly flow should allow boundary layer to warm such that inhibition is removed by 17z ahead of a zone of weak low-level confluence. Isolated thunderstorms are expected to develop across northern New England within a flow regime that could support storm organization capable of producing isolated damaging wind gusts. ..Darrow/Cook.. 08/12/2019 Read more

WW 0573 Status Updates
STATUS REPORT ON WW 573 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 NNW BHK TO 30 SE OLF TO 65 NNE OLF. ..KERR..08/12/19 ATTN...WFO...GGW... STATUS REPORT FOR WS 573 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC021-083-085-109-120640- MT . MONTANA COUNTIES INCLUDED ARE DAWSON RICHLAND ROOSEVELT WIBAUX THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0573 Status Updates
STATUS REPORT ON WW 573 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 NNW BHK TO 30 SE OLF TO 65 NNE OLF. ..KERR..08/12/19 ATTN...WFO...GGW... STATUS REPORT FOR WS 573 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC021-083-085-109-120640- MT . MONTANA COUNTIES INCLUDED ARE DAWSON RICHLAND ROOSEVELT WIBAUX THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 573 SEVERE TSTM MT 112305Z - 120700Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 573 NWS Storm Prediction Center Norman OK 505 PM MDT Sun Aug 11 2019 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Northeast Montana * Effective this Sunday afternoon and Monday morning from 505 PM until 100 AM MDT. * Primary threats include... Scattered damaging wind gusts to 70 mph likely Scattered large hail and isolated very large hail events to 2 inches in diameter possible A tornado or two possible SUMMARY...Clusters of thunderstorms over central Montana will track east-northeastward across the watch area this evening. A few supercells and bow echoes capable of damaging winds and large hail are possible. The severe thunderstorm watch area is approximately along and 80 statute miles north and south of a line from 85 miles west southwest of Glasgow MT to 10 miles north northeast of Sidney MT. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU3). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 569...WW 570...WW 571...WW 572... AVIATION...A few severe thunderstorms with hail surface and aloft to 2 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 26030. ...Hart Read more

MD 1712 CONCERNING SEVERE THUNDERSTORM WATCH 574... FOR SOUTHERN NEBRASKA/NORTHERN KANSAS
Mesoscale Discussion 1712 NWS Storm Prediction Center Norman OK 1130 PM CDT Sun Aug 11 2019 Areas affected...southern Nebraska/northern Kansas Concerning...Severe Thunderstorm Watch 574... Valid 120430Z - 120630Z The severe weather threat for Severe Thunderstorm Watch 574 continues. SUMMARY...Severe risk continues across WW 574 -- particularly across the north-central Kansas/south-central Nebraska border counties. Risk for damaging winds, including the possibility for winds in excess of 70 MPH, remains evident. DISCUSSION...Latest radar loop shows a well-defined bow echo moving east-northeastward at 45 kt across the southern Nebraska/northern Kansas area, with the surging apex of the bow right along the border, affecting Harlon and Franklin Counties in Nebraska, and Phillips and Smith Counties in Kansas. While no obs sites have been in the direct path of the bow's apex, where the strongest winds are indicated by radar, gusts in excess of 70 MPH appear likely to be occurring. With a very moist/unstable airmass downstream of the convection available to continue to fuel stout updrafts, expect damaging wind risk to continue spreading across the watch area. ..Goss.. 08/12/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...OAX...TOP...ICT...GID...LBF...DDC...GLD... LAT...LON 38730022 39050033 40840038 41099636 39249659 38730022 Read more

WW 0572 Status Updates
STATUS REPORT ON WW 572 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 55 SSE GLD TO 25 E GLD TO 40 S MCK TO 20 WSW MCK TO 55 ENE SNY. ..GOSS..08/12/19 ATTN...WFO...GLD...LBF... STATUS REPORT FOR WT 572 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS KSC039-063-109-179-193-120440- KS . KANSAS COUNTIES INCLUDED ARE DECATUR GOVE LOGAN SHERIDAN THOMAS NEC063-085-087-101-111-135-145-120440- NE . NEBRASKA COUNTIES INCLUDED ARE FRONTIER HAYES HITCHCOCK KEITH LINCOLN PERKINS RED WILLOW THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0572 Status Updates
STATUS REPORT ON WW 572 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 55 SSE GLD TO 25 E GLD TO 40 S MCK TO 20 WSW MCK TO 55 ENE SNY. ..GOSS..08/12/19 ATTN...WFO...GLD...LBF... STATUS REPORT FOR WT 572 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS KSC039-063-109-179-193-120440- KS . KANSAS COUNTIES INCLUDED ARE DECATUR GOVE LOGAN SHERIDAN THOMAS NEC063-085-087-101-111-135-145-120440- NE . NEBRASKA COUNTIES INCLUDED ARE FRONTIER HAYES HITCHCOCK KEITH LINCOLN PERKINS RED WILLOW THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0572 Status Updates
STATUS REPORT ON WW 572 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 55 SSE GLD TO 25 E GLD TO 40 S MCK TO 20 WSW MCK TO 55 ENE SNY. ..GOSS..08/12/19 ATTN...WFO...GLD...LBF... STATUS REPORT FOR WT 572 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS KSC039-063-109-179-193-120440- KS . KANSAS COUNTIES INCLUDED ARE DECATUR GOVE LOGAN SHERIDAN THOMAS NEC063-085-087-101-111-135-145-120440- NE . NEBRASKA COUNTIES INCLUDED ARE FRONTIER HAYES HITCHCOCK KEITH LINCOLN PERKINS RED WILLOW THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0572 Status Updates
STATUS REPORT ON WW 572 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 55 SSE GLD TO 25 E GLD TO 40 S MCK TO 20 WSW MCK TO 55 ENE SNY. ..GOSS..08/12/19 ATTN...WFO...GLD...LBF... STATUS REPORT FOR WT 572 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS KSC039-063-109-179-193-120440- KS . KANSAS COUNTIES INCLUDED ARE DECATUR GOVE LOGAN SHERIDAN THOMAS NEC063-085-087-101-111-135-145-120440- NE . NEBRASKA COUNTIES INCLUDED ARE FRONTIER HAYES HITCHCOCK KEITH LINCOLN PERKINS RED WILLOW THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 572 TORNADO CO KS NE 112045Z - 120400Z
URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 572 NWS Storm Prediction Center Norman OK 245 PM MDT Sun Aug 11 2019 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Far eastern Colorado Northwest Kansas Southwest Nebraska * Effective this Sunday afternoon and evening from 245 PM until 1000 PM MDT. * Primary threats include... A couple tornadoes possible Scattered damaging winds and isolated significant gusts to 85 mph likely Scattered large hail and isolated very large hail events to 2.5 inches in diameter possible SUMMARY...Multiple discrete supercells will develop into far eastern Colorado with all severe hazards possible. These storms will likely consolidate and evolve into a bowing MCS that accelerates east along the Kansas-Nebraska border. This will yield an increasing risk for significant severe wind gusts later this evening. The tornado watch area is approximately along and 90 statute miles north and south of a line from 65 miles west southwest of Imperial NE to 25 miles south southeast of Mccook NE. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU2). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. && OTHER WATCH INFORMATION...CONTINUE...WW 569...WW 570...WW 571... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 2.5 inches. Extreme turbulence and surface wind gusts to 75 knots. A few cumulonimbi with maximum tops to 600. Mean storm motion vector 25035. ...Grams Read more

WW 0573 Status Updates
STATUS REPORT ON WW 573 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 NW MLS TO 50 N MLS TO 30 SW OLF TO 25 WNW OLF TO 35 NE GGW TO 60 NNE GGW. ..COOK..08/12/19 ATTN...WFO...GGW... STATUS REPORT FOR WS 573 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC021-055-079-083-085-109-120440- MT . MONTANA COUNTIES INCLUDED ARE DAWSON MCCONE PRAIRIE RICHLAND ROOSEVELT WIBAUX THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0573 Status Updates
STATUS REPORT ON WW 573 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 NW MLS TO 50 N MLS TO 30 SW OLF TO 25 WNW OLF TO 35 NE GGW TO 60 NNE GGW. ..COOK..08/12/19 ATTN...WFO...GGW... STATUS REPORT FOR WS 573 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC021-055-079-083-085-109-120440- MT . MONTANA COUNTIES INCLUDED ARE DAWSON MCCONE PRAIRIE RICHLAND ROOSEVELT WIBAUX THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

MD 1711 CONCERNING TORNADO WATCH 571... FOR SOUTHEASTERN MONTANA...FAR NORTHERN WYOMING...AND WESTERN/CENTRAL SOUTH DAKOTA
Mesoscale Discussion 1711 NWS Storm Prediction Center Norman OK 0945 PM CDT Sun Aug 11 2019 Areas affected...southeastern Montana...far northern Wyoming...and western/central South Dakota Concerning...Tornado Watch 571... Valid 120245Z - 120345Z The severe weather threat for Tornado Watch 571 continues. SUMMARY...Portions of WW 571 will need to be extended for a few more hours to address the ongoing severe threats in the WW areas. DISCUSSION...Ongoing convective clusters/linear complexes continue to forward-propagate eastward across remaining portions of WW 571 - one cluster over southeastern MT just east of Billings and another near /south of PHP. The pre-convective environments ahead of these storms remain supportive of all modes of severe weather, though hail and wind are the main threats given storm mode. The linear complex in Montana has a history of severe wind gusts and significant hail, and although substantial overturning/stabilization has occurred across western South Dakota and vicinity, this stabilized air will probably not impact the ongoing severe MCS in that area for the next couple of hours or so. ..Cook.. 08/12/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...ABR...BIS...LBF...UNR...BYZ...GGW... LAT...LON 46910705 46960592 46440354 45540187 44310104 43669992 43299961 43059984 42930092 43170166 43950191 44820233 45290376 45210476 44940579 44740629 44580682 44830762 45180803 45670820 46410774 46680741 46910705 Read more

WW 0574 Status Updates
STATUS FOR WATCH 0574 HAS NOT BEEN ISSUED YET Read more

WW 0574 Status Updates
STATUS FOR WATCH 0574 HAS NOT BEEN ISSUED YET Read more