Dec 11, 2017 0600 UTC Day 1 Convective Outlook
Updated: Mon Dec 11 05:25:04 UTC 2017 (20171211 1200Z Day 1 shapefile | 20171211 1200Z Day 1 KML)
Probabilistic to Categorical Outlook Conversion Table
Categorical Graphic
20171211 1200 UTC Day 1 Outlook Graphic
Day 1 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
No Risk Areas Forecast
Probabilistic Tornado Graphic
20171211 1200 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
20171211 1200 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
No Risk Areas Forecast
Probabilistic Large Hail Graphic
20171211 1200 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
No Risk Areas Forecast
   SPC AC 110525

   Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1125 PM CST Sun Dec 10 2017

   Valid 111200Z - 121200Z

   ...NO THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   Thunderstorms are not forecast across the Lower 48 states on Monday.

   ...Discussion...

   The mid-level pattern will remain characterized by a high-amplitude
   ridge across the western United States and a deep trough across the
   East. Subsidence beneath the western ridge and limited moisture
   across the East due to off-shore flow into the Gulf of Mexico and
   Atlantic Ocean will lead to a stable airmass across the contiguous
   United States. Thus, thunderstorms are not likely.

   ..Marsh.. 12/11/2017

   NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1300Z