Apr 15, 2023 0100 UTC Day 1 Convective Outlook
Updated: Sat Apr 15 00:48:53 UTC 2023 (20230415 0100Z Day 1 shapefile | 20230415 0100Z Day 1 KML)
Probabilistic to Categorical Outlook Conversion Table
Categorical Graphic
20230415 0100 UTC Day 1 Outlook Graphic
Day 1 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
SLIGHT 48,922 2,579,494 Omaha, NE...Wichita, KS...Lincoln, NE...Council Bluffs, IA...Bellevue, NE...
MARGINAL 161,921 12,434,515 San Antonio, TX...Raleigh, NC...Greensboro, NC...Durham, NC...Winston-Salem, NC...
Probabilistic Tornado Graphic
20230415 0100 UTC Day 1 Tornado Probabilities Graphic
Probability of a tornado within 25 miles of a point.
Hatched Area: 10% or greater probability of EF2 - EF5 tornadoes within 25 miles of a point.
Day 1 Tornado Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
No Risk Areas Forecast
Probabilistic Damaging Wind Graphic
20230415 0100 UTC Day 1 Damaging Wind Probabilities Graphic
Probability of damaging thunderstorm winds or wind gusts of 50 knots or higher within 25 miles of a point.
Hatched Area: 10% of greater probability of wind gusts 65 knots or greater within 25 miles of a point.
Day 1 Wind Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
SIG SEVERE 18,948 679,135 Lincoln, NE...Salina, KS...Hutchinson, KS...Junction City, KS...Great Bend, KS...
15 % 48,765 2,582,846 Omaha, NE...Wichita, KS...Lincoln, NE...Council Bluffs, IA...Bellevue, NE...
5 % 162,446 12,437,447 San Antonio, TX...Raleigh, NC...Greensboro, NC...Durham, NC...Winston-Salem, NC...
Probabilistic Large Hail Graphic
20230415 0100 UTC Day 1 Large Hail Probabilities Graphic
Probability of hail 1" or larger within 25 miles of a point.
Hatched Area: 10% or greater probability of hail 2" or larger within 25 miles of a point.
Day 1 Hail Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
SIG SEVERE 13,209 230,406 Salina, KS...Hutchinson, KS...
15 % 38,622 1,564,398 Wichita, KS...Lincoln, NE...Salina, KS...Manhattan, KS...Hutchinson, KS...
5 % 172,470 13,288,312 San Antonio, TX...Omaha, NE...Raleigh, NC...Greensboro, NC...Durham, NC...
   SPC AC 150048

   Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0748 PM CDT Fri Apr 14 2023

   Valid 150100Z - 151200Z

   ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
   THE CENTRAL PLAINS...

   ...SUMMARY...
   Severe thunderstorms capable of producing large hail and damaging
   winds are most likely this evening from southeast Nebraska into
   central Kansas and northwest Oklahoma. Additional isolated severe
   thunderstorms remain possible across south-central Texas this
   evening.

   ...01z Update...

   Early-evening water-vapor imagery depicts a short-wave trough
   ejecting east across CO/NM with the leading edge of large-scale
   forcing now spreading across the central High Plains. Isolated
   strong/severe thunderstorms are noted immediately ahead of this
   feature within the post-frontal upslope flow over southeast CO. This
   activity should continue to spread east ahead of the short wave.

   Of more significance, downstream, scattered convection continues to
   expand in areal coverage along the cold font from southeast NE into
   central KS. Pre-frontal dryline convection over southern
   KS/northwestern OK may continue to grow upscale as the cold front
   surges into the southwestern flank of this activity over the next
   few hours. Many of these updrafts are generating hail and this
   should be the primary concern, especially with supercells where hail
   could locally approach 2 inches in the strongest cores.
   Thunderstorms should propagate northeast along the frontal zone
   aided by a strengthening LLJ later this evening across eastern KS.

   Farther south, a low-latitude short-wave trough is progressing
   across northeast Mexico toward deep south Texas. Majority of
   lightning-producing convection is currently observed over the higher
   terrain south of the Big Bend. 00z sounding from DRT exhibited very
   steep lapse rates through 6km with seasonally strong wind profiles.
   It's not entirely clear how convectively active south-central TX
   will be ahead of this feature but some risk for isolated supercells
   remains across this region which could generate hail/wind.

   ..Darrow.. 04/15/2023

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   NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 0600Z