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 130040
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0640 PM CST Sun Dec 12 2021
Valid 130100Z - 131200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
A few thunderstorms will be possible across the coastal Pacific
Northwest tonight.
...Coastal Northwest...
Scattered, shallow, weak convection continues along the Pacific
northwest coast and immediate near-offshore environment within
broader upper trough. 00z soundings from UIL and SLE exhibit very
weak SBCAPE (around 50 J/kg) but steep surface-6km lapse rates (~8
C/km). This steep lapse rate environment will continue to support
scattered showers and perhaps a few flashes of lightning within the
strongest updrafts.
..Darrow.. 12/13/2021
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 0600Z
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