Severe Storm Outlook Narrative (AC)
Issued by NWS
ACUS11 KWNS 220318
SPC MCD 220318
Mesoscale Discussion 0307
NWS Storm Prediction Center Norman OK
1018 PM CDT Tue Mar 21 2017
Areas affected...far east-central GA into the SC coastal plain
Concerning...Severe Thunderstorm Watch 77...
Valid 220318Z - 220415Z
The severe weather threat for Severe Thunderstorm Watch 77
SUMMARY...Strong to severe gusts (45-65 mph) are likely with the
forward-propagating MCS with scattered wind damage becoming more
isolated towards the coast.
DISCUSSION...Radar mosaic shows a fragmented squall line over the SC
Piedmont and southward into far east-central GA. A measured gust at
KMMT near Columbia, SC observed 50-kt at 0238z coincident with the
squall line. The northern portion of the MCS is moving to the east
around 40-kt while the southern bow is moving east around 50-kt and
possesses a well-developed rear-inflow jet (accompanied by 2-3
mb/hour pressure rises). The cirrus canopy from the MCS is probably
limiting otherwise greater diurnal cooling over the I-95 corridor
which will lead to an appreciable risk for scattered wind damage
during the next 30-60 minutes. Cooler surface temperatures near the
immediate SC coast and larger convective inhibition will probably
lead to the threat for wind damage becoming more isolated as storms
reach the immediate coast.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 32428039 32888244 33738211 33708110 34318036 33977944