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SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0747 PM CDT Thu Jul 17 2025 Valid 180100Z - 181200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN EASTERN MT TO FAR SOUTHWEST ND... ...SUMMARY... A couple supercells will remain capable of large hail and severe gusts through about midnight across eastern Montana. ...Northern Great Plains... A couple supercells are ongoing over north-central MT with a history of measured severe gusts and severe hail signatures per MRMS MESH. This activity should persist southeastward through at least late evening amid strong effective bulk shear but weak buoyancy and modest mid-level lapse rates per the 00Z GGW sounding. Most guidance outside of the RRFS suggest that convection will remain as discrete supercells before eventually waning as it impinges on minimal surface-based instability near the MT/ND border. With such a cool and dry boundary layer per surface observations across far eastern MT into ND, the overall severe threat should diminish towards midnight. Elevated convection should develop across parts of the Dakotas overnight, with weak MUCAPE marginalizing severe potential. ...Southern High Plains... A slow-moving, loosely organized cluster is ongoing east-southeast of the Sangre de Cristo Mountains in northeast NM. While the boundary layer is climatologically cool, it is moist and moderately unstable (per the 00Z AMA sounding), amid persistent low-level easterlies. This upslope flow regime should support cluster maintenance through late evening before gradually waning overnight. While heavy rain is the primary hazard (per WPC ERO SLGT risk), a few strong to marginal severe gusts and small hail remain possible. ...Northern ME... Convection has largely waned across New England and should continue to do so over the next hour. With some lingering deep convection across northern ME, a moist boundary layer and still sufficient deep-layer shear (per the CBW VWP) may support a weakly rotating storm or two before convection spreads entirely into NB. ...Eastern OK to the Delmarva... A couple microbursts capable of strong gusts may still occur in yet to be overturned areas across a broad swath from the Ozarks to the Mid-Atlantic Coast. With modest deep-layer shear and nocturnal boundary-layer cooling, severe probabilities appear negligible. ..Grams.. 07/18/2025 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0747 PM CDT Thu Jul 17 2025 Valid 180100Z - 181200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN EASTERN MT TO FAR SOUTHWEST ND... ...SUMMARY... A couple supercells will remain capable of large hail and severe gusts through about midnight across eastern Montana. ...Northern Great Plains... A couple supercells are ongoing over north-central MT with a history of measured severe gusts and severe hail signatures per MRMS MESH. This activity should persist southeastward through at least late evening amid strong effective bulk shear but weak buoyancy and modest mid-level lapse rates per the 00Z GGW sounding. Most guidance outside of the RRFS suggest that convection will remain as discrete supercells before eventually waning as it impinges on minimal surface-based instability near the MT/ND border. With such a cool and dry boundary layer per surface observations across far eastern MT into ND, the overall severe threat should diminish towards midnight. Elevated convection should develop across parts of the Dakotas overnight, with weak MUCAPE marginalizing severe potential. ...Southern High Plains... A slow-moving, loosely organized cluster is ongoing east-southeast of the Sangre de Cristo Mountains in northeast NM. While the boundary layer is climatologically cool, it is moist and moderately unstable (per the 00Z AMA sounding), amid persistent low-level easterlies. This upslope flow regime should support cluster maintenance through late evening before gradually waning overnight. While heavy rain is the primary hazard (per WPC ERO SLGT risk), a few strong to marginal severe gusts and small hail remain possible. ...Northern ME... Convection has largely waned across New England and should continue to do so over the next hour. With some lingering deep convection across northern ME, a moist boundary layer and still sufficient deep-layer shear (per the CBW VWP) may support a weakly rotating storm or two before convection spreads entirely into NB. ...Eastern OK to the Delmarva... A couple microbursts capable of strong gusts may still occur in yet to be overturned areas across a broad swath from the Ozarks to the Mid-Atlantic Coast. With modest deep-layer shear and nocturnal boundary-layer cooling, severe probabilities appear negligible. ..Grams.. 07/18/2025 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0747 PM CDT Thu Jul 17 2025 Valid 180100Z - 181200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN EASTERN MT TO FAR SOUTHWEST ND... ...SUMMARY... A couple supercells will remain capable of large hail and severe gusts through about midnight across eastern Montana. ...Northern Great Plains... A couple supercells are ongoing over north-central MT with a history of measured severe gusts and severe hail signatures per MRMS MESH. This activity should persist southeastward through at least late evening amid strong effective bulk shear but weak buoyancy and modest mid-level lapse rates per the 00Z GGW sounding. Most guidance outside of the RRFS suggest that convection will remain as discrete supercells before eventually waning as it impinges on minimal surface-based instability near the MT/ND border. With such a cool and dry boundary layer per surface observations across far eastern MT into ND, the overall severe threat should diminish towards midnight. Elevated convection should develop across parts of the Dakotas overnight, with weak MUCAPE marginalizing severe potential. ...Southern High Plains... A slow-moving, loosely organized cluster is ongoing east-southeast of the Sangre de Cristo Mountains in northeast NM. While the boundary layer is climatologically cool, it is moist and moderately unstable (per the 00Z AMA sounding), amid persistent low-level easterlies. This upslope flow regime should support cluster maintenance through late evening before gradually waning overnight. While heavy rain is the primary hazard (per WPC ERO SLGT risk), a few strong to marginal severe gusts and small hail remain possible. ...Northern ME... Convection has largely waned across New England and should continue to do so over the next hour. With some lingering deep convection across northern ME, a moist boundary layer and still sufficient deep-layer shear (per the CBW VWP) may support a weakly rotating storm or two before convection spreads entirely into NB. ...Eastern OK to the Delmarva... A couple microbursts capable of strong gusts may still occur in yet to be overturned areas across a broad swath from the Ozarks to the Mid-Atlantic Coast. With modest deep-layer shear and nocturnal boundary-layer cooling, severe probabilities appear negligible. ..Grams.. 07/18/2025 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0747 PM CDT Thu Jul 17 2025 Valid 180100Z - 181200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN EASTERN MT TO FAR SOUTHWEST ND... ...SUMMARY... A couple supercells will remain capable of large hail and severe gusts through about midnight across eastern Montana. ...Northern Great Plains... A couple supercells are ongoing over north-central MT with a history of measured severe gusts and severe hail signatures per MRMS MESH. This activity should persist southeastward through at least late evening amid strong effective bulk shear but weak buoyancy and modest mid-level lapse rates per the 00Z GGW sounding. Most guidance outside of the RRFS suggest that convection will remain as discrete supercells before eventually waning as it impinges on minimal surface-based instability near the MT/ND border. With such a cool and dry boundary layer per surface observations across far eastern MT into ND, the overall severe threat should diminish towards midnight. Elevated convection should develop across parts of the Dakotas overnight, with weak MUCAPE marginalizing severe potential. ...Southern High Plains... A slow-moving, loosely organized cluster is ongoing east-southeast of the Sangre de Cristo Mountains in northeast NM. While the boundary layer is climatologically cool, it is moist and moderately unstable (per the 00Z AMA sounding), amid persistent low-level easterlies. This upslope flow regime should support cluster maintenance through late evening before gradually waning overnight. While heavy rain is the primary hazard (per WPC ERO SLGT risk), a few strong to marginal severe gusts and small hail remain possible. ...Northern ME... Convection has largely waned across New England and should continue to do so over the next hour. With some lingering deep convection across northern ME, a moist boundary layer and still sufficient deep-layer shear (per the CBW VWP) may support a weakly rotating storm or two before convection spreads entirely into NB. ...Eastern OK to the Delmarva... A couple microbursts capable of strong gusts may still occur in yet to be overturned areas across a broad swath from the Ozarks to the Mid-Atlantic Coast. With modest deep-layer shear and nocturnal boundary-layer cooling, severe probabilities appear negligible. ..Grams.. 07/18/2025 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0747 PM CDT Thu Jul 17 2025 Valid 180100Z - 181200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN EASTERN MT TO FAR SOUTHWEST ND... ...SUMMARY... A couple supercells will remain capable of large hail and severe gusts through about midnight across eastern Montana. ...Northern Great Plains... A couple supercells are ongoing over north-central MT with a history of measured severe gusts and severe hail signatures per MRMS MESH. This activity should persist southeastward through at least late evening amid strong effective bulk shear but weak buoyancy and modest mid-level lapse rates per the 00Z GGW sounding. Most guidance outside of the RRFS suggest that convection will remain as discrete supercells before eventually waning as it impinges on minimal surface-based instability near the MT/ND border. With such a cool and dry boundary layer per surface observations across far eastern MT into ND, the overall severe threat should diminish towards midnight. Elevated convection should develop across parts of the Dakotas overnight, with weak MUCAPE marginalizing severe potential. ...Southern High Plains... A slow-moving, loosely organized cluster is ongoing east-southeast of the Sangre de Cristo Mountains in northeast NM. While the boundary layer is climatologically cool, it is moist and moderately unstable (per the 00Z AMA sounding), amid persistent low-level easterlies. This upslope flow regime should support cluster maintenance through late evening before gradually waning overnight. While heavy rain is the primary hazard (per WPC ERO SLGT risk), a few strong to marginal severe gusts and small hail remain possible. ...Northern ME... Convection has largely waned across New England and should continue to do so over the next hour. With some lingering deep convection across northern ME, a moist boundary layer and still sufficient deep-layer shear (per the CBW VWP) may support a weakly rotating storm or two before convection spreads entirely into NB. ...Eastern OK to the Delmarva... A couple microbursts capable of strong gusts may still occur in yet to be overturned areas across a broad swath from the Ozarks to the Mid-Atlantic Coast. With modest deep-layer shear and nocturnal boundary-layer cooling, severe probabilities appear negligible. ..Grams.. 07/18/2025 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0747 PM CDT Thu Jul 17 2025 Valid 180100Z - 181200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN EASTERN MT TO FAR SOUTHWEST ND... ...SUMMARY... A couple supercells will remain capable of large hail and severe gusts through about midnight across eastern Montana. ...Northern Great Plains... A couple supercells are ongoing over north-central MT with a history of measured severe gusts and severe hail signatures per MRMS MESH. This activity should persist southeastward through at least late evening amid strong effective bulk shear but weak buoyancy and modest mid-level lapse rates per the 00Z GGW sounding. Most guidance outside of the RRFS suggest that convection will remain as discrete supercells before eventually waning as it impinges on minimal surface-based instability near the MT/ND border. With such a cool and dry boundary layer per surface observations across far eastern MT into ND, the overall severe threat should diminish towards midnight. Elevated convection should develop across parts of the Dakotas overnight, with weak MUCAPE marginalizing severe potential. ...Southern High Plains... A slow-moving, loosely organized cluster is ongoing east-southeast of the Sangre de Cristo Mountains in northeast NM. While the boundary layer is climatologically cool, it is moist and moderately unstable (per the 00Z AMA sounding), amid persistent low-level easterlies. This upslope flow regime should support cluster maintenance through late evening before gradually waning overnight. While heavy rain is the primary hazard (per WPC ERO SLGT risk), a few strong to marginal severe gusts and small hail remain possible. ...Northern ME... Convection has largely waned across New England and should continue to do so over the next hour. With some lingering deep convection across northern ME, a moist boundary layer and still sufficient deep-layer shear (per the CBW VWP) may support a weakly rotating storm or two before convection spreads entirely into NB. ...Eastern OK to the Delmarva... A couple microbursts capable of strong gusts may still occur in yet to be overturned areas across a broad swath from the Ozarks to the Mid-Atlantic Coast. With modest deep-layer shear and nocturnal boundary-layer cooling, severe probabilities appear negligible. ..Grams.. 07/18/2025 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0747 PM CDT Thu Jul 17 2025 Valid 180100Z - 181200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN EASTERN MT TO FAR SOUTHWEST ND... ...SUMMARY... A couple supercells will remain capable of large hail and severe gusts through about midnight across eastern Montana. ...Northern Great Plains... A couple supercells are ongoing over north-central MT with a history of measured severe gusts and severe hail signatures per MRMS MESH. This activity should persist southeastward through at least late evening amid strong effective bulk shear but weak buoyancy and modest mid-level lapse rates per the 00Z GGW sounding. Most guidance outside of the RRFS suggest that convection will remain as discrete supercells before eventually waning as it impinges on minimal surface-based instability near the MT/ND border. With such a cool and dry boundary layer per surface observations across far eastern MT into ND, the overall severe threat should diminish towards midnight. Elevated convection should develop across parts of the Dakotas overnight, with weak MUCAPE marginalizing severe potential. ...Southern High Plains... A slow-moving, loosely organized cluster is ongoing east-southeast of the Sangre de Cristo Mountains in northeast NM. While the boundary layer is climatologically cool, it is moist and moderately unstable (per the 00Z AMA sounding), amid persistent low-level easterlies. This upslope flow regime should support cluster maintenance through late evening before gradually waning overnight. While heavy rain is the primary hazard (per WPC ERO SLGT risk), a few strong to marginal severe gusts and small hail remain possible. ...Northern ME... Convection has largely waned across New England and should continue to do so over the next hour. With some lingering deep convection across northern ME, a moist boundary layer and still sufficient deep-layer shear (per the CBW VWP) may support a weakly rotating storm or two before convection spreads entirely into NB. ...Eastern OK to the Delmarva... A couple microbursts capable of strong gusts may still occur in yet to be overturned areas across a broad swath from the Ozarks to the Mid-Atlantic Coast. With modest deep-layer shear and nocturnal boundary-layer cooling, severe probabilities appear negligible. ..Grams.. 07/18/2025 Read more

WW 0521 Status Updates
STATUS REPORT ON WW 521 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 WNW LEB TO 20 SW EFK TO 10 ESE EFK TO 75 NNE EFK. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1703 ..WENDT..07/17/25 ATTN...WFO...CAR...GYX...BTV... STATUS REPORT FOR WS 521 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MEC003-007-017-021-025-172340- ME . MAINE COUNTIES INCLUDED ARE AROOSTOOK FRANKLIN OXFORD PISCATAQUIS SOMERSET NHC003-007-009-172340- NH . NEW HAMPSHIRE COUNTIES INCLUDED ARE CARROLL COOS GRAFTON VTC005-009-017-019-172340- VT . VERMONT COUNTIES INCLUDED ARE CALEDONIA ESSEX ORANGE Read more

WW 0521 Status Updates
STATUS REPORT ON WW 521 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 WNW LEB TO 20 SW EFK TO 10 ESE EFK TO 75 NNE EFK. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1703 ..WENDT..07/17/25 ATTN...WFO...CAR...GYX...BTV... STATUS REPORT FOR WS 521 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MEC003-007-017-021-025-172340- ME . MAINE COUNTIES INCLUDED ARE AROOSTOOK FRANKLIN OXFORD PISCATAQUIS SOMERSET NHC003-007-009-172340- NH . NEW HAMPSHIRE COUNTIES INCLUDED ARE CARROLL COOS GRAFTON VTC005-009-017-019-172340- VT . VERMONT COUNTIES INCLUDED ARE CALEDONIA ESSEX ORANGE Read more

WW 0521 Status Updates
STATUS REPORT ON WW 521 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 WNW LEB TO 20 SW EFK TO 10 ESE EFK TO 75 NNE EFK. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1703 ..WENDT..07/17/25 ATTN...WFO...CAR...GYX...BTV... STATUS REPORT FOR WS 521 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MEC003-007-017-021-025-172340- ME . MAINE COUNTIES INCLUDED ARE AROOSTOOK FRANKLIN OXFORD PISCATAQUIS SOMERSET NHC003-007-009-172340- NH . NEW HAMPSHIRE COUNTIES INCLUDED ARE CARROLL COOS GRAFTON VTC005-009-017-019-172340- VT . VERMONT COUNTIES INCLUDED ARE CALEDONIA ESSEX ORANGE Read more

WW 0521 Status Updates
STATUS REPORT ON WW 521 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 WNW LEB TO 20 SW EFK TO 10 ESE EFK TO 75 NNE EFK. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1703 ..WENDT..07/17/25 ATTN...WFO...CAR...GYX...BTV... STATUS REPORT FOR WS 521 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MEC003-007-017-021-025-172340- ME . MAINE COUNTIES INCLUDED ARE AROOSTOOK FRANKLIN OXFORD PISCATAQUIS SOMERSET NHC003-007-009-172340- NH . NEW HAMPSHIRE COUNTIES INCLUDED ARE CARROLL COOS GRAFTON VTC005-009-017-019-172340- VT . VERMONT COUNTIES INCLUDED ARE CALEDONIA ESSEX ORANGE Read more

WW 0521 Status Updates
STATUS REPORT ON WW 521 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 WNW LEB TO 20 SW EFK TO 10 ESE EFK TO 75 NNE EFK. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1703 ..WENDT..07/17/25 ATTN...WFO...CAR...GYX...BTV... STATUS REPORT FOR WS 521 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MEC003-007-017-021-025-172340- ME . MAINE COUNTIES INCLUDED ARE AROOSTOOK FRANKLIN OXFORD PISCATAQUIS SOMERSET NHC003-007-009-172340- NH . NEW HAMPSHIRE COUNTIES INCLUDED ARE CARROLL COOS GRAFTON VTC005-009-017-019-172340- VT . VERMONT COUNTIES INCLUDED ARE CALEDONIA ESSEX ORANGE Read more

MD 1703 CONCERNING SEVERE THUNDERSTORM WATCH 521... FOR PORTIONS OF NORTHERN NEW ENGLAND
Mesoscale Discussion 1703 NWS Storm Prediction Center Norman OK 0543 PM CDT Thu Jul 17 2025 Areas affected...Portions of northern New England Concerning...Severe Thunderstorm Watch 521... Valid 172243Z - 180015Z The severe weather threat for Severe Thunderstorm Watch 521 continues. SUMMARY...Strong/damaging winds will remain possible into perhaps mid evening. A brief tornado could occur in northeast Maine over the next 1-2 hours. DISCUSSION...The KCBW VAD data continues to show large low-level hodographs. Convection in northeast Maine has certainly trended more linear over the past few hours, but a few marginal supercells remain and have shown moderate low-level rotation periodically. These storms will pose a threat for damaging winds and a brief tornado for another 1-2 hours before moving into the Canadian Maritimes. Farther south and west, a line of weak convection has developed along the Vermont/New Hampshire border. With temperatures ahead of this line currently in the mid/upper 80s F (at least in New Hampshire), there is at least some potential for a strong/damaging wind gust to occur. Deep-layer shear has also increased in this area as the shortwave trough has approached late this afternoon. That being said, diurnal cooling will also increase with time. It is unclear how strong this activity will be as it approaches western Maine later this evening. ..Wendt.. 07/17/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...CAR...GYX...BTV...ALY... LAT...LON 43147303 44687274 46486986 47126818 47136772 46306776 45506921 44756976 43107215 43147303 MOST PROBABLE PEAK TORNADO INTENSITY...85-115 MPH MOST PROBABLE PEAK WIND GUST...55-70 MPH Read more

WW 521 SEVERE TSTM ME NH NY VT 171825Z - 180100Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 521 NWS Storm Prediction Center Norman OK 225 PM EDT Thu Jul 17 2025 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Western and Northern Maine Northern and Central New Hampshire Far Northern New York Northern and Central Vermont * Effective this Thursday afternoon and evening from 225 PM until 900 PM EDT. * Primary threats include... Scattered damaging wind gusts to 65 mph possible A tornado or two possible SUMMARY...Scattered thunderstorms are forecast to develop and intensify this afternoon across the Watch area. A couple of transient supercells are possible as well as a few organized multicells. The primary severe hazard will be strong to severe gusts (50-65 mph) capable of wind damage, but a tornado is possible with the more intense transient supercells. The severe thunderstorm watch area is approximately along and 75 statute miles east and west of a line from 20 miles north northwest of Caribou ME to 15 miles south southwest of Montpelier VT. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU1). 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. && AVIATION...A few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 55 knots. A few cumulonimbi with maximum tops to 400. Mean storm motion vector 23030. ...Smith Read more

WW 0522 Status Updates
STATUS REPORT ON WW 522 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..DEAN..07/17/25 ATTN...WFO...TFX...GGW... STATUS REPORT FOR WS 522 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC005-015-027-033-041-051-055-069-071-073-101-105-172340- MT . MONTANA COUNTIES INCLUDED ARE BLAINE CHOUTEAU FERGUS GARFIELD HILL LIBERTY MCCONE PETROLEUM PHILLIPS PONDERA TOOLE VALLEY 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

755
ABNT20 KNHC 172325
TWOAT

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 PM EDT Thu Jul 17 2025

For the North Atlantic...Caribbean Sea and the Gulf of America:

Southeastern Louisiana (AL93):
Satellite, surface, and radar data indicate that the broad low
pressure area that had been moving westward along the northern Gulf
coast is now centered over southeastern Louisiana. This system is
forecast to move farther inland tonight and on Friday, and
development is therefore not expected. Nonetheless, heavy rainfall
could still produce localized flash flooding over portions of the
north-central Gulf Coast through Friday.

This will be the last update on this system from the National
Hurricane Center. For additional information on the ongoing
potential for heavy rainfall and flooding, please refer to products
issued by the Weather Prediction Center and your local National
Weather Service office.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...low...near 0 percent.

$$
Forecaster Berg

032
ABPZ20 KNHC 172309
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 PM PDT Thu Jul 17 2025

For the eastern and central North Pacific east of 180 longitude:

Tropical cyclone formation is not expected during the next 7 days.

$$
Forecaster Jelsema

000
ABPZ20 KNHC 172309
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 PM PDT Thu Jul 17 2025

For the eastern and central North Pacific east of 180 longitude:

Tropical cyclone formation is not expected during the next 7 days.

$$
Forecaster Jelsema

WW 0521 Status Updates
STATUS REPORT ON WW 521 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 WNW LEB TO 20 SW EFK TO 10 ESE EFK TO 75 NNE EFK. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1703 ..WENDT..07/17/25 ATTN...WFO...CAR...GYX...BTV... STATUS REPORT FOR WS 521 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MEC003-007-017-021-025-172340- ME . MAINE COUNTIES INCLUDED ARE AROOSTOOK FRANKLIN OXFORD PISCATAQUIS SOMERSET NHC003-007-009-172340- NH . NEW HAMPSHIRE COUNTIES INCLUDED ARE CARROLL COOS GRAFTON VTC005-009-017-019-172340- VT . VERMONT COUNTIES INCLUDED ARE CALEDONIA ESSEX ORANGE Read more

MD 1703 CONCERNING SEVERE THUNDERSTORM WATCH 521... FOR PORTIONS OF NORTHERN NEW ENGLAND
Mesoscale Discussion 1703 NWS Storm Prediction Center Norman OK 0543 PM CDT Thu Jul 17 2025 Areas affected...Portions of northern New England Concerning...Severe Thunderstorm Watch 521... Valid 172243Z - 180015Z The severe weather threat for Severe Thunderstorm Watch 521 continues. SUMMARY...Strong/damaging winds will remain possible into perhaps mid evening. A brief tornado could occur in northeast Maine over the next 1-2 hours. DISCUSSION...The KCBW VAD data continues to show large low-level hodographs. Convection in northeast Maine has certainly trended more linear over the past few hours, but a few marginal supercells remain and have shown moderate low-level rotation periodically. These storms will pose a threat for damaging winds and a brief tornado for another 1-2 hours before moving into the Canadian Maritimes. Farther south and west, a line of weak convection has developed along the Vermont/New Hampshire border. With temperatures ahead of this line currently in the mid/upper 80s F (at least in New Hampshire), there is at least some potential for a strong/damaging wind gust to occur. Deep-layer shear has also increased in this area as the shortwave trough has approached late this afternoon. That being said, diurnal cooling will also increase with time. It is unclear how strong this activity will be as it approaches western Maine later this evening. ..Wendt.. 07/17/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...CAR...GYX...BTV...ALY... LAT...LON 43147303 44687274 46486986 47126818 47136772 46306776 45506921 44756976 43107215 43147303 MOST PROBABLE PEAK TORNADO INTENSITY...85-115 MPH MOST PROBABLE PEAK WIND GUST...55-70 MPH Read more