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.
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 091233
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0633 AM CST Tue Nov 09 2021
Valid 091300Z - 101200Z
...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS WESTERN WA...
...SUMMARY...
A brief tornado or locally damaging wind event is possible this
afternoon, mainly across a portion of western Washington.
...Western WA/northwest OR...
A strong shortwave trough will spread inland later this morning with
a pocket of -30 C 500-mb temperatures centered on western WA this
afternoon. As the Pacific surface front advances farther inland,
westerly onshore flow in conjunction with the cooling mid-levels
will result in a destabilizing air mass. Scattered low-topped
convection is expected this afternoon with sporadic lightning
flashes in the more intense cells. Favorable low-level speed shear
should yield adequate hodograph curvature to foster a conditional
threat for a transient supercell. But scant buoyancy will most
likely preclude a more substantial severe threat beyond a
low-probability tornado and/or damaging wind event.
..Grams.. 11/09/2021
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1630Z
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