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Spring/ Summer 2014 Convection Discussion


weatherwiz

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I know Quincy's feeling was we wouldn't see any sun today..which was why he was down on severe. Obviously the instability won't be an issue today..We'll just have to watch that disturbance you mentioned as it moves NE and see how things unfold

I never said no sun, but there isn't exactly much sun right now. Overcast here in the Naugatuck Valley:

Decoded Surface Obs

Mon Jul 14 15:21:44 UTC 2014

ID Temp Dew Winds Press Clouds Prec Weather

F F deg knt mb 100ft cov in

KBDL 80 70 0 at 3 1012.6 40 BKN ----

KBDR 77 71 220 at 7 1013.3 47 BKN ----

KDXR 75 67 240 at 3 1013.7 14 OVC ----

KGON 76 71 240 at 8 1013.3 14 SCT ---- haze

KHFD 78 69 160 at 4 1012.9 21 BKN ----

KHVN 77 70 0 at 5 1013.4 15 OVC ----

KIJD 77 69 240 at 5 1013.2 16 OVC ----

KMMK 75 69 200 at 4 1013.4 16 OVC ----

KOXC 73 64 0 at 0 ------ 8 OVC ---- haze

KSNC 77 72 190 at 6 ------ 16 BKN ----

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New meso

MESOSCALE DISCUSSION 1367

NWS STORM PREDICTION CENTER NORMAN OK

1206 PM CDT MON JUL 14 2014

AREAS AFFECTED...NRN VA...MD...PA...NJ...SE NY...DE...ERN WV...FAR

WRN CT

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 141706Z - 141830Z

PROBABILITY OF WATCH ISSUANCE...80 PERCENT

SUMMARY...A SEVERE THREAT IS EXPECTED TO DEVELOP THIS AFTERNOON FROM

ERN WV AND NRN VA EXTENDING NEWD ACROSS MUCH OF PA INTO NJ AND SE

NY. ISOLATED LARGE HAIL AND WIND DAMAGE SHOULD BE THE PRIMARY

THREATS AS THE CELLS INTENSIFY OVER THE NEXT FEW HOURS. WW ISSUANCE

WILL LIKELY BE NEEDED ACROSS THE REGION THIS AFTERNOON.

DISCUSSION...THE LATEST SFC ANALYSIS SHOWS A SFC TROUGH EXTENDING

FROM MD SWWD ACROSS CNTRL VA. SFC DEWPOINTS ALONG THE TROUGH ARE IN

THE LOWER 70S F AND MODERATE INSTABILITY IS ALREADY IN PLACE EARLY

THIS AFTERNOON. MLCAPE IS ESTIMATED IN THE 1000 TO 2000 J/KG RANGE.

CONTINUED DESTABILIZATION AND INCREASING LOW-LEVEL CONVERGENCE ALONG

THE SFC TROUGH SHOULD RESULT IN SCATTERED THUNDERSTORM DEVELOPMENT

OVER THE NEXT HOUR. CONVECTION WILL ALSO BE SUPPORTED BY AN UPSTREAM

SHORTWAVE TROUGH MOVING INTO THE REGION FROM THE WEST EVIDENT ON

WATER VAPOR IMAGERY. IN ADDITION...REGIONAL WSR-88D VWPS ACROSS THE

MCD AREA SHOW 0-6 KM SHEAR IN THE 40 TO 50 KT RANGE. THIS COMBINED

WITH MODERATE INSTABILITY SHOULD BE FAVORABLE FOR ISOLATED SUPERCELL

DEVELOPMENT. SEVERE MULTICELLS WILL ALSO LIKELY DEVELOP. DUE TO

STEEP LOW-LEVEL LAPSE RATES AND UNIDIRECTIONAL WIND PROFILES ABOVE 1

KM...ANY CONVECTION THAT SHOWS ORGANIZATION SHOULD HAVE A WIND

DAMAGE THREAT. ISOLATED LARGE HAIL WILL ALSO BE POSSIBLE ESPECIALLY

WITH CELLS THAT EXHIBIT ROTATION.

..BROYLES/HART.. 07/14/2014

ATTN...WFO...OKX...ALY...PHI...BGM...AKQ...CTP...LWX...RNK...

PBZ...RLX...

LAT...LON

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New meso

MESOSCALE DISCUSSION 1367

NWS STORM PREDICTION CENTER NORMAN OK

1206 PM CDT MON JUL 14 2014

AREAS AFFECTED...NRN VA...MD...PA...NJ...SE NY...DE...ERN WV...FAR

WRN CT

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 141706Z - 141830Z

PROBABILITY OF WATCH ISSUANCE...80 PERCENT

 

 

May the next update will take all of SNE out of the slight risk area.

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Where is the WPC coming up with 4.00" 48 hr QPF forecasts? Does the EC show that?

The Euro is mostly 2-3". I think why WPC is going a bit bullish is because PWAT's are extremely high. With multiple rounds of training strong convection it's a recipe for models busting on the low side. Some HRRR runs have dumped as much as 4-5" today alone.

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