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September 6-7 Severe Weather


snowlover2

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SPC sticking to their guns in new outlook thinking that storms will refire west of the departing MCS along the cold front. Position is somewhat similar to the forecast for the other day which busted in the subsequent development of storms for late afternoon and evening. Will see what happens as trough is supposed to go from positive to neutral.

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MESOSCALE DISCUSSION 1910

NWS STORM PREDICTION CENTER NORMAN OK

1009 AM CDT FRI SEP 07 2012

AREAS AFFECTED...IND...WRN OH...CNTRL IL

CONCERNING...SEVERE POTENTIAL...SEVERE THUNDERSTORM WATCH LIKELY

VALID 071509Z - 071715Z

PROBABILITY OF WATCH ISSUANCE...80 PERCENT

SUMMARY...ONGOING/LARGELY ELEVATED TSTM CLUSTERS SHOULD BECOME

INCREASINGLY SURFACE-BASED AS DOWNSTREAM AIR MASS HEATS AND

DESTABILIZES. STRONG DEEP-LAYER SPEED SHEAR WILL BE SUFFICIENT FOR

EMBEDDED ORGANIZED UPDRAFTS AND PROBABLE UPSCALE GROWTH ALONG THE

LEADING FLANK WITH A PRIMARY THREAT OF DAMAGING WINDS.

DISCUSSION...ALTHOUGH CONVECTIVE OUTFLOW HAS GENERALLY SURGED S OF

THE REMNANT MCS ACROSS CNTRL IL...THE LEADING PORTION OF THE MCS HAS

TAKEN ON A MORE N/S-ORIENTATION THAT IS PERPENDICULAR TO THE

DEEP-LAYER WLY FLOW. AS SURFACE HEATING CONTINUES DOWNSTREAM AND

WITH CONVECTIVE TEMPERATURES IN THE 80S BASED ON THE 12Z ILN

RAOB...ONGOING ACTIVITY WILL BECOME SURFACE-BASED. SOME UNCERTAINTY

DOES EXISTS ON WHEN THIS TRANSITION WILL OCCUR. BUT AMIDST FAVORABLE

0-6 KM SPEED SHEAR AS SAMPLED BY THE WOLCOTT IND

PROFILER...CONVECTION WILL INTENSIFY AT SOME POINT AND LIKELY

DEVELOP EMBEDDED SHORT-LINE SEGMENTS CAPABLE OF PRODUCING DAMAGING

WINDS.

..GRAMS/THOMPSON.. 09/07/2012

ATTN...WFO...CLE...ILN...IWX...IND...LOT...ILX...LSX...

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Socked in with clouds/light rain, temp is only 69. Another shot looks possible this evening but I'm not sure how much we will destabilize by then.

everything i see still points to a line pushing through your area....lack of destabilization will probably do a number on severe potential though.

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Socked in with clouds/light rain, temp is only 69. Another shot looks possible this evening but I'm not sure how much we will destabilize by then.

Sort of respectable winds with that blob of convection that just went through here, well, based off the meager radar returns. Sort of. Meh.

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Tornado potential seems to be increasing in MO over to southern IL with 75 dew points providing rich fuel. And yes, that IL cell is now svr warned for Newton County Indiana.

Getting a good squall line forming in central IL southwestward so guess that will be the predominant mode since shear is not as great down there. But I think the position of the low pressure is farther south than what was initially expected for northern IL and IN in earlier forecasts. Weather can change on a dime.

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Tornado warning just to the southeast of here.

BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE INDIANAPOLIS IN

718 PM EDT FRI SEP 7 2012

THE NATIONAL WEATHER SERVICE IN INDIANAPOLIS HAS ISSUED A

* TORNADO WARNING FOR...

NORTHERN BOONE COUNTY IN CENTRAL INDIANA...

SOUTHERN CLINTON COUNTY IN CENTRAL INDIANA...

NORTHEASTERN MONTGOMERY COUNTY IN WEST CENTRAL INDIANA...

SOUTHEASTERN TIPPECANOE COUNTY IN WEST CENTRAL INDIANA...

* UNTIL 800 PM EDT

* AT 713 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS

STORM WAS LOCATED 11 MILES NORTHEAST OF CRAWFORDSVILLE...AND MOVING

EAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...

FRANKFORT...

COLFAX...

THORNTOWN...

KIRKLIN...

MICHIGANTOWN...

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