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June 24-? severe weather discussion


Ian

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It's possible we could go 5 for 5 during the work week in this thread for watches at least.

 

Tomorrow looks like we'll get some sort of broken line east of the apps.

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The thurs-sat evolution is tricky but one of those days could have a decent tornado threat somewhere in the region. Should be able to snag a 5% somewhere at least.

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Thursday will be meh with 20kts 0-6 km shear if the NAM is right

Timing might be a problem as usual. My guess is Thurs will end up with enough tho. Not sure the front will stay far enough north for Friday but that could be a good one with better shear.
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SPC drops SLGT risk for us for Thursday and not even 5% for Friday :lol:

 

Thurs disco:

..MIDDLE ATLANTIC    LATEST SHORT-RANGE MODEL GUIDANCE HAS REGRESSED REGARDING  INSTABILITY ACROSS THE MIDDLE ATLANTIC INTO SERN NY DURING THE DAY2  PERIOD.  WITH ONLY MODEST MID LEVEL SWLY FLOW EXPECTED ACROSS THIS  REGION IT APPEARS FORECAST INSTABILITY AND WEAK LAPSE RATE  ENVIRONMENT SHOULD BE A BIT TOO WEAK TO WARRANT MORE THAN 5 PERCENT  SEVERE PROBS FOR LOCALLY DAMAGING WIND GUSTS WITH DIURNALLY ENHANCED  CONVECTION.    ..DARROW.. 06/26/2013 
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LWX meso models seem to suggest rapid development this afternoon of storms after 2pm across the area... I think another round is developing I-81 corridor at 8 pm tomorrow night but that is as far as the WRF-NMM4N goes on its 00z 6/26 run... hits our area between 4-7 pm in some kind of conglomerate... 00z 6/26 WRF-ARW disagrees and says individual cells in the area... then develops a nice line to our W/NW and is bringing it through as the run ends around 8 pm (prob 9pm ish for DC proper)

 

FWIW, SLGT risk for I-95 and to the W and NW for today... 15% wind and 15% hail

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Not sure the D2 made a ton of sense. There is discrepancy between the NAM/SREF and globals etc. The former are not super I suppose but the NAM still has plenty of instability with a 500mb pool crossing during the afternoon.  Friday might be shot if the cold front gets away.. tho south still seems open to more options. 

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You have a good track record. Now whether that translates to actual severe for us remains to be determined. 

 

it looks less impressive than it has at times but given we only need 30 mph gusts to get severe warnings around here...

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2500-3000 SBCAPE already at noon... 1500-2000 MLCAPE... -5 to -6 LI's... LL Lapse Rates aproaaching 7.5 C/KM and ML Lapse Rates are actually decent above 6.0 C/KM for now

 

storms firing nw of cho already.

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Abrupt change from this morning... 1730 OTLK now mentions tornadoes

.ERN CONUS    WITH AMPLIFICATION OF THE TROUGH IN THE EAST...LOW/MID-LEVEL FLOW  WILL BECOME AT LEAST MODERATE. COMBINED WITH INCREASING LARGE-SCALE  ASCENT AND 60S TO LOWER 70S SURFACE DEW POINTS...SETUP SHOULD YIELD  FAIRLY WIDESPREAD CONVECTION ON THU AFTERNOON/EVENING. THE MOST  ROBUST COMBINATION OF CAPE/SHEAR SHOULD EXIST ACROSS PARTS OF THE  SOUTHEAST WHERE 500 MB NWLYS SHOULD REACH 25-35 KT AMIDST A STRONGLY  UNSTABLE AIR MASS. HERE...TSTM CLUSTERS WILL BE CAPABLE OF BOTH  SEVERE WIND/HAIL. ACROSS THE MID-ATLANTIC/NORTHEAST...UNCERTAINTY  EXISTS OVER THE DEGREE OF INSTABILITY WITH NRN EXTENT. BUT WITH  PROBABLE CYCLOGENESIS...EVEN MODEST HEATING SHOULD SUPPORT A RISK  FOR DAMAGING WINDS AND A COUPLE OF TORNADOES. 
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