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 220100
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0800 PM CDT Wed Apr 21 2021
Valid 220100Z - 221200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
A few isolated thunderstorms are possible in eastern Maine.
...Discussion...
Isolated thunderstorm activity is currently ongoing near the cold
front/surface low in eastern Maine. The cold front/surface low will
move offshore in the next few hours bringing and end to thunderstorm
activity in Maine.
The boundary layer has stabilized across the Midwest, thus bringing
an end to the thunderstorm threat.
An isolated lightning flash or two remains possible across portions
of Nevada and Utah, but this threat is waning as the boundary layer
cools.
Thunderstorm activity will likely remain offshore with stable
conditions prevailing across southern Florida and the Keys.
..Bentley/Thompson.. 04/22/2021
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 0600Z
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