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General Thunderstorm Obs. Thread


tombo82685
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MESOSCALE DISCUSSION 1347
NWS STORM PREDICTION CENTER NORMAN OK
0525 PM CDT THU JUL 09 2015

AREAS AFFECTED...ERN PA...NJ...NRN MD/DE

CONCERNING...SEVERE THUNDERSTORM WATCH
398...

VALID 092225Z - 100000Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 398
CONTINUES.

SUMMARY...STRONG WIND GUSTS PRIMARILY PRODUCING TREE DAMAGE WILL
REMAIN PROBABLE AS A SMALL QLCS EVOLVES E FROM WW 397 INTO WW
398...MAINLY ACROSS SERN PA AND MOST OF NJ INTO NRN MD/DE.

DISCUSSION...MEASURED WIND GUSTS OF 35-45 KT HAVE BEEN COMMON WITH
PASSAGE OF THE QLCS ACROSS S-CNTRL PA/N-CNTRL MD...REF
KMDT/KCXY/KDMW/KLNS METARS. DOWNSTREAM AIR MASS REMAINS RELATIVELY
WARM /OUTSIDE OF THE IMMEDIATE COASTAL AREA/...WITH SURFACE
TEMPERATURES IN THE LOWER TO MIDDLE 80S. THIS SHOULD BE SUPPORTIVE
OF CONTINUED DOWNWARD MOMENTUM TRANSPORT OF AROUND 40-45 KT 3-KM AGL
WLY FLOW /AS SAMPLED BY LWX VWP DATA/. GIVEN THE NEARLY
PERPENDICULAR NATURE OF MID-LEVEL FLOW TO THE ORIENTATION OF THE
LINE /ESPECIALLY ACROSS SERN PA/...THE RISK FOR STRONG WIND GUSTS
MAY BE GREATEST TOWARDS THE PHILADELPHIA AND TRENTON AREAS AROUND
00Z.

NRN PORTION OF WW 398 ACROSS NERN PA MAY STRUGGLE TO REALIZE STRONG
WINDS GIVEN PREDOMINANT STRATIFORM CHARACTER AND WEAKER INSTABILITY
WITH NRN EXTENT.
 
EDIT: Eh, kinda ninja'd.
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looks like a meso low over nw berks county? Neat little spin in there.

Yeah interesting feature. Gradually darkening skies. Doesn't look threatening though to the average joe not following the radar. (Ex: my neighbors)

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