|Mesoscale Discussion 1307|
< Previous MD Next MD >
Mesoscale Discussion 1307
NWS Storm Prediction Center Norman OK
0523 PM CDT Thu Jul 13 2017
Areas affected...southeast Pennsylvania through central and southern
Concerning...Severe Thunderstorm Watch 412...413...
Valid 132223Z - 140000Z
The severe weather threat for Severe Thunderstorm Watch 412, 413
SUMMARY...Some threat for mainly a couple of instances of damaging
wind will persist over remainder of WW 413 from southeast PA through
central and southern NJ through about 00Z followed by a rapid
diminishing trend. Severe threat in WW 412 is ending.
DISCUSSION...Primary severe threat next hour or two will persist
with storms training southeast along a convective outflow boundary
from southeast PA through the southern half of NJ. Moderate
instability with around 2000 J/kg MLCAPE and unidirectional westerly
wind profiles with 30-35 kt effective bulk shear will support mostly
multicells with bowing segments as well as a few storms with weak
mid-level updraft rotation. A few instances of strong to damaging
wind gusts remain the primary threat through about 00Z, but a
stabilizing boundary layer should contribute to a rapid diminishing
trend prior to WW 413 expiration time of 01Z.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 40267607 40107429 39617418 39557458 39677558 39917635
Top/All Mesoscale Discussions/Forecast Products/Home