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July 1-8, 2012 Heat & Storms


Herb@MAWS

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Make a call now - stick your neck out ;)

i think that northern end will try to hit us if it holds together. it's just not insanely impressive right now and it's going to come in pretty late.

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i think that northern end will try to hit us if it holds together. it's just not insanely impressive right now and it's going to come in pretty late.

It is really just starting to organize now. The three complexes appear to be merging together into one curved line. I'll hold back on the derecho 2 call though but if the trend continues we'll know by 8pm.

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Would say no chance of derecho with this, but northern OH cluster seems capable of holding together most of the night and would end up in MD-DC-noVA around midnight to 0300h. The southern cluster may make it as far as WV then begin to fragment over the mountains west of ROA at about the same time, some of this may make it into soVA.

Would expect the storms to retain borderline severe and could bring beneficial 1-3 inch rains if they hold together. Then if wind and hail issues were not too severe, this could be a net positive.

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Cold pools between the northern and southern complexs seem to be congealing. Still a little to early to tell, but it is possible that we could have a "serial" type squall line with time. Combination of a little stronger SR low level flow and high instability/good lapse rates would argue for the maintenance or further organization as the complex pushes into WV/Eastern OH, PA

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Late may not be a problem though - esp with the very warm temps and such.

maybe.. cape forecasts are not all that crazy, at least compared to friday. 1-2k mlcape will do tho. we've mixed out a bit more than you'd probably want with dews now near 60 and decent winds from nw/w.

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mcd1349.gif

MESOSCALE DISCUSSION 1349

NWS STORM PREDICTION CENTER NORMAN OK

0622 PM CDT SUN JUL 01 2012

AREAS AFFECTED...NERN OH...WRN PA

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 012322Z - 020045Z

PROBABILITY OF WATCH ISSUANCE...60 PERCENT

SUMMARY...A SVR TSTM WATCH MAY BE NEEDED DOWNSTREAM OF THE

CNTRL/N-CNTRL OHIO CONVECTIVE LINE. TRENDS WILL CONTINUE TO BE

MONITORED.

DISCUSSION...CONVECTION CONTINUES TO ELONGATE ALONG THE N-S-ORIENTED

LEADING EDGE OF A COLD POOL MATERIALIZING ACROSS THE WRN HALF OF

OHIO OWING TO BOTH NRN AND CNTRL OHIO CONVECTIVE CLUSTERS. MODERATE

MID-LEVEL FLOW PER CLEVELAND VWP DATA OFFERING 35-50 KT OF EFFECTIVE

BULK SHEAR IS PRESENT. COLD POOL/SHEAR INTERACTIONS MAY BE ADEQUATE

TO CONTINUE TO SUPPORT UPSCALE CONVECTIVE GROWTH AS ACTIVITY

APPROACHES NERN OH AND EVENTUALLY WRN PA. AS SUCH...SOME POTENTIAL

FOR A RELATIVELY MORE SUBSTANTIAL DMGG WIND THREAT MAY ENSUE.

HOWEVER...RELATIVELY MORE LIMITED INSTABILITY NORTH OF A DIFFUSE

STATIONARY FRONT MAY HINDER MORE ROBUST CONVECTIVE GROWTH DESPITE

ENHANCEMENT OFFERED BY COLD POOL/SHEAR BALANCE. AS SUCH...WW

ISSUANCE DOWNSTREAM IS NOT CERTAIN...BUT IS POSSIBLE.

..COHEN/HART.. 07/01/2012

ATTN...WFO...CTP...PBZ...CLE...

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Wow, haven't checked radar for a while. The line forming that's connecting the 2 comlpexes is kinda making me nervous. Nothing compared to Friday of course but dc metro is prob going to get something half decent tonight. I really want to keep my power so I'm rooting for the split.

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