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
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
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 301938
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0138 PM CST Sat Dec 30 2017
Valid 302000Z - 311200Z
...NO THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Thunderstorms are unlikely over the Lower 48 states through tonight.
...20Z Update...
Very isolated lightning was noted about an hour ago as a snow squall
moved from Lake Huron over the far northern tip of the lower MI
thumb. A lightning strike or two remains possible within any ongoing
or newly developed lake-effect bands but coverage will remain less
than 10%. Some isolated thunder also remains possible over the
western Gulf of Mexico as a surface low ejects northeastward but
land areas should remain void of any thunderstorms.
..Mosier.. 12/30/2017
.PREV DISCUSSION... /ISSUED 1005 AM CST Sat Dec 30 2017/
Surface high pressure will continue east of the Rockies with a
convectively stable environment in place over the CONUS. A weakly
unstable air mass is present over parts of the northwest and central
Gulf of Mexico. This may support an isolated thunderstorm over the
offshore Gulf waters south of the upper Texas and Louisiana coasts,
but overall thunderstorm probabilities are less than 10%.
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 0100Z
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