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 301953
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0153 PM CST TUE DEC 30 2014
VALID 302000Z - 311200Z
...NO TSTM AREAS FORECAST...
...SUMMARY...
THUNDERSTORMS ARE UNLIKELY ACROSS THE UNITED STATES FOR THE
REMAINDER OF TODAY INTO TONIGHT.
...DISCUSSION...
NO CHANGES HAVE BEEN MADE TO THE ONGOING FORECAST.
..COHEN.. 12/30/2014
.PREV DISCUSSION... /ISSUED 0956 AM CST TUE DEC 30 2014/
...SYNOPSIS...
THE POSITIVELY TILTED TROUGH FROM THE GREAT BASIN INTO EASTERN
CANADA WILL SPLIT TODAY...WITH A CLOSED LOW DEVELOPING OVER SOUTHERN
CALIFORNIA AND THE LOWER COLORADO VALLEY...WHILE THE NORTHERN BRANCH
OF THE TROUGH TRAVERSES EAST ACROSS THE GREAT LAKES.
ELSEWHERE...FAST ZONAL FLOW WILL OVERSPREAD MUCH OF THE SOUTHERN
HALF OF THE U.S.
AT THE SURFACE...AN ARCTIC AIRMASS WILL CONTINUE TO SLIDE SOUTH AND
EAST ACROSS THE SOUTHERN PLAINS TOWARD THE LOWER MISSISSIPPI AND
TENNESSEE RIVER VALLEYS...AS A STRONG SURFACE HIGH ENCOMPASSES MUCH
OF THE CONUS FROM THE ROCKIES TO THE APPALACHIANS. A COLD FRONT OVER
THE NORTHERN FLORIDA PENINSULA WILL SAG SOUTHWARD THROUGH THE DAY.
WHILE A WARM AND MOIST AIRMASS IS IN PLACE OVER THE PENINSULA...WEAK
EFFECTIVE SHEAR AND POOR LAPSE RATES SHOULD LIMIT ACTIVITY TO
SHALLOW CONVECTIVE SHOWERS WITH LITTLE TO NO LIGHTNING EXPECTED.
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 0100Z
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