Severe Storm Outlook Narrative (AC)
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274
ACUS11 KWNS 202349
SWOMCD
SPC MCD 202348
NYZ000-NJZ000-PAZ000-210115-

Mesoscale Discussion 1372
NWS Storm Prediction Center Norman OK
0648 PM CDT Thu Jul 20 2017

Areas affected...Eastern PA...NJ...Far Southeast NY

Concerning...Severe Thunderstorm Watch 426...

Valid 202348Z - 210115Z

The severe weather threat for Severe Thunderstorm Watch 426
continues.

SUMMARY...The threat of locally damaging wind continues across
mainly the southern portion of WW 426, with a general diminishing
trend expected with time this evening.

DISCUSSION...The northern portion of the long-lived MCS approaching
the Mid-Atlantic has weakened quite a bit across portions of
southeast NY, likely due to a lack of buoyancy and weak midlevel
lapse rates. A few stronger wind gusts remain possible along the
leading outflow as this convection approaches NYC, but the severe
threat appears to have diminished in this area and the northern
portions of the watch may be canceled early.

Further south, a stronger embedded cell is approaching the I-95
corridor north of Philadelphia. With more vigorous convection
persisting in this area, the threat for locally damaging wind will
continue for the next 1-2 hours as convection approaches the coast.
With time, nocturnal cooling/destabilization should eventually
result in a weakening trend with this activity as well.

..Dean.. 07/20/2017

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

ATTN...WFO...OKX...PHI...CTP...

LAT...LON   40557593 40757580 41037470 41397440 41227388 40947365
            40547361 40227401 39737416 39537432 39767478 39957525
            40187556 40557593




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