Post-Tropical Cyclone Jerry Wind Speed Probabilities Number 33
Post-Tropical Cyclone Jerry Public Advisory Number 33
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Post-Tropical Cyclone Jerry Forecast Advisory Number 33
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Tropical Storm Karen Graphics
Tropical Storm Karen Wind Speed Probabilities Number 14
Tropical Storm Karen Forecast Discussion Number 14
Tropical Storm Karen Public Advisory Number 14
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Hurricane Lorenzo Graphics
Tropical Storm Karen Forecast Advisory Number 14
Hurricane Lorenzo Wind Speed Probabilities Number 11
Hurricane Lorenzo Forecast Advisory Number 11
Hurricane Lorenzo Public Advisory Number 11
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SPC Sep 25, 2019 1300 UTC Day 1 Convective Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0752 AM CDT Wed Sep 25 2019 Valid 251300Z - 261200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE OZARKS WESTWARD OVER PARTS OF OKLAHOMA AND KANSAS...AS WELL AS PARTS OF ARIZONA AND SOUTHEASTERN CALIFORNIA... ...SUMMARY... Isolated severe winds and hail are possible this afternoon and evening from the Ozarks westward over parts of Oklahoma and Kansas, as well as parts of Arizona and southeastern California. ...Synopsis... In mid/upper levels, broadly cyclonic flow will cover the northern CONUS from the northern Rockies across much of the Midwest and Great Lakes. This flow belt, and a series of embedded shortwaves, will reside largely on the poleward side of a related surface front described below. A cut-off low -- initially located over the northern Baja/northern Gulf of CA area -- is expected to meander erratically near its present location through today, then move slowly northward up the lower Colorado River area overnight. At the surface, 11Z analysis showed a cold front from central Lake Superior across central WI, southern IA, and central KS, to a weak low over southwestern KS. By 00Z the front should reach Lake Huron, northern/central IN, southeastern/south-central MO, and north- central OK, then into an elongated area of low pressure covering southern CO, northeastern NM and the TX Panhandle. A separate, prefrontal surface trough and wind-shift line, likely related to an area of outflow, may develop from the TX Panhandle across central/ eastern OK. By 12Z, the front should reach Lake Ontario, the upper Ohio Valley, and eastern KY, becoming quasistationary across the southern Ozarks into central/western OK and the TX Panhandle. ...Ozarks and vicinity to western/central OK... Isolated to scattered thunderstorms, mainly in clusters, should develop over the region today, likely focused most densely around the front, outflow boundaries and differential-heating zones. Damaging to severe gusts and large hail are possible beneath the most vigorous cells. Latest low/middle-level satellite imagery and composited radar animations reveal an MCV over northeastern OK. This feature, and the associated swirl of clouds/precip and sporadic convection, should move eastward to east-southeastward across the southern Ozarks region through the day. A related outflow boundary, initially curving from northeastern OK south of OUN to near CHK and over west-central OK, should lose some definition through the day and retreat northward somewhat. Meanwhile, the front will decelerate over the MO Ozarks and southeastern KS. Given the likely plethora of subtle foci, strong mesoscale dependence of the risk, and related uncertainties still lingering at this hour, strong- severe storm concentration is expected to be highly inconsistent/ erratic across the outlook area. Away from patches of sustained clouds/precip, diurnal heating and rich low-level moisture (upper 60s to low 70s F surface dew points) will support MLCAPE of 2500- 4000 J/kg, but with only 25-30 kt effective-shear magnitudes for most of the afternoon due to modest low/middle-level flow. Convection initiation over central/northern/northwestern OK, and a nearby sliver of KS containing sufficient moisture, is highly uncertain due to weak low-level flow and related lack of boundary- layer forcing, as well as somewhat weaker theta-e near the front itself. Most progs develop little, if any, sustained convection across this corridor. Still, conditional severe potential exists, given the presence of strong warm-sector diurnal heating, ample low-level moisture, locally strong buoyancy, well-mixed boundary layer, winds veering with height, low-level shear marginally extending into supercellular parameter spaces by around 00Z, and vorticity-concentrating boundaries. ...Southern AZ/CA... Widely scattered thunderstorms are expected to develop across portions of south-central/central AZ and Sonora, pivoting cyclonically about the northern semicircle of the mid/upper vortex. Some of this activity ultimately may move westward or even southwestward over southeastern CA. Any sustained convection over southeastern AZ also may move northward to northeastward in a regime of strongly difluent mid/upper-level winds and largely meridional mean deep-layer flow. These thunderstorms will be capable of isolated severe hail and gusts. The organized severe threat still appears too low/conditional for more than a marginal area, given the modest magnitudes of both deep shear and max preconvective buoyancy. Still, the most intense cells may produce large hail and damaging gusts, given the proximity of the cold-core low, sufficient residual moisture for surface-based storms, and enough diurnal heating to build a well-mixed, inverted-v thermodynamic profile in the boundary layer. ..Edwards/Leitman.. 09/25/2019 Read more
SPC Sep 25, 2019 1300 UTC Day 1 Convective Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0752 AM CDT Wed Sep 25 2019 Valid 251300Z - 261200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE OZARKS WESTWARD OVER PARTS OF OKLAHOMA AND KANSAS...AS WELL AS PARTS OF ARIZONA AND SOUTHEASTERN CALIFORNIA... ...SUMMARY... Isolated severe winds and hail are possible this afternoon and evening from the Ozarks westward over parts of Oklahoma and Kansas, as well as parts of Arizona and southeastern California. ...Synopsis... In mid/upper levels, broadly cyclonic flow will cover the northern CONUS from the northern Rockies across much of the Midwest and Great Lakes. This flow belt, and a series of embedded shortwaves, will reside largely on the poleward side of a related surface front described below. A cut-off low -- initially located over the northern Baja/northern Gulf of CA area -- is expected to meander erratically near its present location through today, then move slowly northward up the lower Colorado River area overnight. At the surface, 11Z analysis showed a cold front from central Lake Superior across central WI, southern IA, and central KS, to a weak low over southwestern KS. By 00Z the front should reach Lake Huron, northern/central IN, southeastern/south-central MO, and north- central OK, then into an elongated area of low pressure covering southern CO, northeastern NM and the TX Panhandle. A separate, prefrontal surface trough and wind-shift line, likely related to an area of outflow, may develop from the TX Panhandle across central/ eastern OK. By 12Z, the front should reach Lake Ontario, the upper Ohio Valley, and eastern KY, becoming quasistationary across the southern Ozarks into central/western OK and the TX Panhandle. ...Ozarks and vicinity to western/central OK... Isolated to scattered thunderstorms, mainly in clusters, should develop over the region today, likely focused most densely around the front, outflow boundaries and differential-heating zones. Damaging to severe gusts and large hail are possible beneath the most vigorous cells. Latest low/middle-level satellite imagery and composited radar animations reveal an MCV over northeastern OK. This feature, and the associated swirl of clouds/precip and sporadic convection, should move eastward to east-southeastward across the southern Ozarks region through the day. A related outflow boundary, initially curving from northeastern OK south of OUN to near CHK and over west-central OK, should lose some definition through the day and retreat northward somewhat. Meanwhile, the front will decelerate over the MO Ozarks and southeastern KS. Given the likely plethora of subtle foci, strong mesoscale dependence of the risk, and related uncertainties still lingering at this hour, strong- severe storm concentration is expected to be highly inconsistent/ erratic across the outlook area. Away from patches of sustained clouds/precip, diurnal heating and rich low-level moisture (upper 60s to low 70s F surface dew points) will support MLCAPE of 2500- 4000 J/kg, but with only 25-30 kt effective-shear magnitudes for most of the afternoon due to modest low/middle-level flow. Convection initiation over central/northern/northwestern OK, and a nearby sliver of KS containing sufficient moisture, is highly uncertain due to weak low-level flow and related lack of boundary- layer forcing, as well as somewhat weaker theta-e near the front itself. Most progs develop little, if any, sustained convection across this corridor. Still, conditional severe potential exists, given the presence of strong warm-sector diurnal heating, ample low-level moisture, locally strong buoyancy, well-mixed boundary layer, winds veering with height, low-level shear marginally extending into supercellular parameter spaces by around 00Z, and vorticity-concentrating boundaries. ...Southern AZ/CA... Widely scattered thunderstorms are expected to develop across portions of south-central/central AZ and Sonora, pivoting cyclonically about the northern semicircle of the mid/upper vortex. Some of this activity ultimately may move westward or even southwestward over southeastern CA. Any sustained convection over southeastern AZ also may move northward to northeastward in a regime of strongly difluent mid/upper-level winds and largely meridional mean deep-layer flow. These thunderstorms will be capable of isolated severe hail and gusts. The organized severe threat still appears too low/conditional for more than a marginal area, given the modest magnitudes of both deep shear and max preconvective buoyancy. Still, the most intense cells may produce large hail and damaging gusts, given the proximity of the cold-core low, sufficient residual moisture for surface-based storms, and enough diurnal heating to build a well-mixed, inverted-v thermodynamic profile in the boundary layer. ..Edwards/Leitman.. 09/25/2019 Read more