ACUS11 KWNS 032213
SWOMCD
SPC MCD 032213
PAZ000-WVZ000-032345-

Mesoscale Discussion 2220
NWS Storm Prediction Center Norman OK
0513 PM CDT Thu Sep 03 2026

Areas affected...portions of southeastern Pennsylvania

Concerning...Severe Thunderstorm Watch 649...650...

Valid 032213Z - 032345Z

The severe weather threat for Severe Thunderstorm Watch 649, 650
continues.

SUMMARY...An organizing MCS will yield a greater risk for severe
wind gusts across portions of southwestern Pennsylvania over the
next 1-2 hours.

DISCUSSION...Regional radar imagery depicts an organizing MCS across
portions of western Pennsylvania, with volume scans over the past 30
minutes from KPBZ depicting embedded velocities up to 65 kts at 600
ft AGL. Numerous reports of wind damage have been noted with this
complex, including downed trees and power lines, with a 62 mph wind
gust also recently measured at KHLG in far northern West Virginia.
The downstream environment remains favorable for damaging/severe
wind gusts, with steep low-level lapse rates (7.5-8.0 K/km),
moderately strong instability (2500-3000 J/kg MLCAPE), and around
30-40 kts of effective shear in place, as sampled by the 18z PIT
observed sounding and recent objective analysis. Given this
environment and the organizing MCS, a locally greater risk for
damaging/severe wind gusts is likely to accompany this system as it
progresses east-southeastward across portions of southwestern
Pennsylvania.

..Chalmers.. 09/03/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fjg!8w8qAzL_rCdMeLpXJO_WvZ8OjuThV4YjynI_rAAF7XuXCjtpMQKBxqEbLh-w3Wg_5sLSEVE-okNQ6EDEC5GE-xi1u0E$ for graphic product...

ATTN...WFO...CTP...PBZ...

LAT...LON 40807971 40837951 40837933 40597877 40387844 40087843
39837880 39857945 40038003 40318051 40428054 40668018
40737995 40807971

MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN


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