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 251213
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0613 AM CST Mon Dec 25 2017
Valid 251300Z - 261200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
A few lightning strikes may occur within lake effect snow bands
downwind of Lakes Erie and Ontario. Additionally, thundersnow will
be possible across coastal Maine through early afternoon.
...Discussion...
Broad, cyclonic midlevel flow will maintain a generally cool/cold,
stable airmass across much of the northern and eastern United
States. Cold-air advection across the Great Lakes will support lake
effect snows, which may yield a few lightning strikes within the
shallow convection downwind of Lakes Erie and Ontario. Additionally,
as a deepening cyclone moves northeast from near Cape Cod toward the
Canadian maritime provinces today, thundersnow may occur across
coastal Maine. See Mesoscale Discussion #1810 for more information
about this thundersnow potential.
..Marsh.. 12/25/2017
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