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 120548
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1148 PM CST Sat Dec 11 2021
Valid 121200Z - 131200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
A few thunderstorms will be possible across the coastal Pacific
Northwest through late afternoon.
...Pacific Northwest...
Upper heights will gradually fall across the Pacific Northwest today
as secondary upper trough approaches coastal WA/OR/northern CA late
in the period. Very cold temperatures aloft will result in steep
lower-tropospheric lapse rates such that scattered convection should
easily develop within onshore maritime air mass. Forecast soundings
suggest a few hundred J/kg SBCAPE should be adequate for updrafts to
penetrate levels necessary for lightning. Updrafts should wane after
sunset as boundary layer cools.
..Darrow/Squitieri.. 12/12/2021
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1300Z
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