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 100518
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1118 PM CST Sat Dec 09 2017
Valid 101200Z - 111200Z
...NO THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Thunderstorms are not forecast across the Lower 48 states on Sunday.
...Synopsis...
The large-scale upper-level pattern across the CONUS on Sunday will
be characterized by a broad trough across much of the
central/eastern U.S. and a ridge extending north from northern
Mexico across the Pacific Northwest. Several vorticity maxima will
rotate around the trough, the strongest of which will move southeast
across the northern Plains and Upper Midwest Sunday night. Surface
high pressure extending from south Texas east across the southeast
U.S. will result in generally offshore low-level flow and preclude a
northward return of substantial moisture/instability. As a result,
thunderstorms are not anticipated on Sunday. However, an isolated
lightning strike will be possible across the Great Lakes associated
with lake-enhanced snow bands.
..Bunting/Elliott.. 12/10/2017
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1300Z
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