SPC MD 1983

SPC MD 1983


Mesoscale Discussion 1983
NWS Storm Prediction Center Norman OK
0258 PM CDT Sun Aug 13 2023

Areas affected…eastern NH…Maine

Concerning…Severe Thunderstorm Watch 640…

Valid 131958Z – 132100Z

The severe weather threat for Severe Thunderstorm Watch 640

SUMMARY…The risk for isolated large hail and damaging gusts will
continue across the watch area. The greatest severe risk through
5pm EDT is over central Maine in association with a few multicells
and supercells.

DISCUSSION…Visible-satellite imagery shows a destabilizing cumulus
field over northern Maine, which is located downstream of
strong/severe thunderstorm activity. Surface temperatures are
gradually warming into the lower 70s where the stratus has eroded
for more than 1 hour, and this warmer and increasingly destabilizing
boundary layer will become more favorable for the ongoing storms to
maintain vigor as they move into northern portions of Maine. As
such, the greatest risk for large hail and damaging gusts will occur
with storms over central Maine as they move east near I-95.

Farther southwest, additional storms will move into western parts of
Maine and continue to develop over NH over the next 1-2 hours. It
is unclear regarding the coverage of severe activity with these
storms since some convective overturning via outflow has spread
across parts of western/southern Maine.

..Smith.. 08/13/2023

…Please see www.spc.noaa.gov for graphic product…


LAT…LON 42747118 42747125 42777135 42827143 43567173 43597173
45317108 46706999 47466922 47366823 47336816 47206796
47076779 45926775 45826776 44406796 44106833 43826889
42877082 42747118 42747118

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