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ACUS11 KWNS 312019
SWOMCD
SPC MCD 312019
MAZ000-RIZ000-NHZ000-CTZ000-NYZ000-VTZ000-NJZ000-PAZ000-MDZ000-DEZ000-VAZ000-DC
Z000-312115-

Mesoscale Discussion 1622
NWS Storm Prediction Center Norman OK
0319 PM CDT Wed Jul 31 2019

Areas affected...portions of northern VA into southern New England

Concerning...Severe Thunderstorm Watch 547...

Valid 312019Z - 312115Z

The severe weather threat for Severe Thunderstorm Watch 547
continues.

SUMMARY...Strong to severe storms capable mainly of damaging winds
will continue across the watch area. A downstream watch may be
needed across parts of central and eastern VA.

DISCUSSION...Clusters and line segments have sporadically produced
severe reports this afternoon. Most notably, a 64 kt (74 mph) gust
at Boston Logan International Airport. Additional isolated hail
reports also have been noted, along with wind speeds generally in
the 35-45 kt range bring reported across the region. Much of the
convection from near Philadelphia to NYC to Boston has produced
pronounced outflow. This should lead to poorer low level lapse rates
and wind potential should decrease behind these clusters of storms
as they either weaken or move northeast offshore. In the short-term,
a few strong gusts are still possible with the strongest cells.

Further south, Convection has struggled to move off of higher
terrain from the WV Panhandle into northern VA and the Washington
D.C. area where early cloud cover has persisted into the afternoon,
resulting in an area of cooler temperatures and weaker instability.
South of this area however, a line of storms tracking toward
Charlottesville VA has become better organized and will encounter a
moderately unstable boundary layer with very steep low level lapse
rates. This area may need to be addressed by an additional watch
issuance downstream of WW 547.

..Leitman.. 07/31/2019

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

ATTN...WFO...GYX...BOX...OKX...ALY...PHI...AKQ...CTP...LWX...

LAT...LON   42676976 41776965 40797105 39927349 38387490 38017598
            37957722 37847877 38337917 39097782 40217581 41207461
            42737260 42676976



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