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Central PA and the fringes - Summer into Fall


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Today is actually a pretty good setup. The key for me is the expected time of day for favorable initiation. These storms are forecasted to fire and hold strong during our climatologically best time for severe (21z-2z). That time frame always peaks my interest since that's when you get your best heating. Might be a good day for once.

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http://www.spc.noaa.gov/products/md/md1339.html

 

MESOSCALE DISCUSSION 1339
NWS STORM PREDICTION CENTER NORMAN OK
1159 AM CDT THU JUL 09 2015

AREAS AFFECTED...PORTIONS OF PA/MD/WV AND FAR NORTH VA

CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY

VALID 091659Z - 091900Z

PROBABILITY OF WATCH ISSUANCE...95 PERCENT

SUMMARY...A TORNADO WATCH WILL LIKELY BE NEEDED FOR AN INCREASING
DAMAGING WIND/ISOLATED TORNADO RISK BY MID/LATE AFTERNOON
PARTICULARLY ACROSS CENTRAL/EASTERN PORTIONS OF PA/MD/WV AND
ADJACENT FAR NORTHERN VA.

DISCUSSION...A SURFACE LOW CONTINUES TO SHIFT EASTWARD ACROSS LAKE
ERIE VICINITY TOWARD NORTHERN PA EARLY THIS AFTERNOON...WHILE A
PRECEDING WARM FRONT WILL CONTINUE TO GRADUALLY SPREAD NORTHWARD
ACROSS PA/NJ. UPSTREAM STORMS CURRENTLY ACROSS NORTHERN WV/FAR
SOUTHWEST PA AT 17Z SHOULD FURTHER INCREASE AND POTENTIALLY GROW
UPSCALE OVER TIME...WHILE ADDITIONAL/SEMI-DISCRETE STORMS SHOULD
ALSO DEVELOP/INCREASE JUST AHEAD OF/PERIPHERAL TO THIS ACTIVITY.
INITIAL SIGNS OF THIS MAY ALREADY BE OCCURRING ACROSS CENTRAL PA
COINCIDENT WITH A DEEPENING CU FIELD PER VISIBLE SATELLITE IMAGERY
AMID AN INCREASINGLY UNSTABLE/WEAKLY INHIBITED WARM SECTOR.

ORGANIZED STORM MODES INCLUDING WHAT MAY BE A COMBINATION OF
SEMI-DISCRETE SUPERCELLS AND AN UPSCALE-GROWING CONVECTIVE LINE/BOWS
WILL BE AIDED BY A SEASONALLY STRONG STRENGTHENING BELT OF
LOW/MID-TROPOSPHERIC WEST-SOUTHWESTERLY WINDS AS NOTED IN UPSTREAM
UPPER-AIR OBSERVATIONS. DAMAGING WINDS CAN BE EXPECTED WITH THE
STRONGER STORMS...WITH SOME TORNADO POTENTIAL AS WELL...PARTICULARLY
IN CLOSER PROXIMITY TO THE SURFACE LOW/WARM FRONT ACROSS PA /AND
EVENTUALLY NJ/.

..GUYER/MEAD.. 07/09/2015


ATTN...WFO...PHI...BGM...CTP...LWX...PBZ...

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Wait...they hype the threat in the eastern parts of the region, then issue the watch in the west?

with the rotation in some of the storms across western PA already they had to get that one issued... they will expand the watch eastward later as the threat gets a little closer as they watch conditions continue to evolve

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Small line of severe thunderstorms beginning to form near the Cumberland gap. As this convection progresses east into the higher instability, we should see further development. Low level shear continues to increase. The greatest threat for weak tornadoes will be any cells out ahead of this line that is forming.

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