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June 23rd to June 28th Severe Threat


Stebo

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Interesting cell mergers along the northern end of the line. Lead cells/supercells have been fully absorbed into the line, which has coincided with enhanced wind signatures developing, and recently a 62 mph wind gust in East Peoria. Sometimes these complex interactions are enough to overcome a relative lack of environmental support.

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Interesting experience with the gravity wave earlier tonight as the SO and I were at friends house playing cards and all of a sudden his ears popped about the time the pressure dropped and the winds were ripping outside with the feature. Never experienced popping ears with a gravity wave but I suppose its a possibility. The non thunderstorms winds associated with this were just wicked and haven't experienced it in a while. Certainly looks like tomorrow things will fire up just East of us once again.

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Don't know if you guys caught this storm report after the complex passed through. Amazing how much of a gradient there was. It's believable too, some chasers in the area measured 98 mph.

‎1228 AM NON-TSTM WND GST CALLENDER 42.36N 94.30W

06/27/2011 E100 MPH WEBSTER IA AMATEUR RADIO

MAIL BOX POSTS BLOWN DOWN TO THE GROUND. SWING SET BLOWN

THROUGH WINDOW. TREES DOWN ON HOUSES AND POWER OUT

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Don't know if you guys caught this storm report after the complex passed through. Amazing how much of a gradient there was. It's believable too, some chasers in the area measured 98 mph.

‎1228 AM NON-TSTM WND GST CALLENDER 42.36N 94.30W

06/27/2011 E100 MPH WEBSTER IA AMATEUR RADIO

MAIL BOX POSTS BLOWN DOWN TO THE GROUND. SWING SET BLOWN

THROUGH WINDOW. TREES DOWN ON HOUSES AND POWER OUT

That is some intense winds behind the main complex, and probably a huge surprise to those that were affected as it would have probably came with little to no precipitation.

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Starting off the day, cool and cloudy. Yet another 90+ degree day advertised in the med range that fails because of difficulties handling mesoscale interactions. I think we see a pretty aggresive trim back on the northern end of the slight risk, this is rather expansive.

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Starting off the day, cool and cloudy. Yet another 90+ degree day advertised in the med range that fails because of difficulties handling mesoscale interactions. I think we see a pretty aggresive trim back on the northern end of the slight risk, this is rather expansive.

I had thought a trimming of the northern portion would happen as well but instead it gets extended.

DAY 1 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

0749 AM CDT MON JUN 27 2011

VALID 271300Z - 281200Z

...THERE IS A SLGT RISK OF SVR TSTMS FROM THE OZARKS/MS VLY INTO THE

MIDWEST AND LWR OH/TN VLYS...

...THERE IS A SLGT RISK OF SVR TSTMS OVER PARTS OF THE CNTRL AND SRN

HI PLNS...

..SYNOPSIS

ELONGATED UPR RIDGE OVER THE SWRN AND S CNTRL U.S. EXPECTED TO BUILD

N ACROSS THE RCKYS THIS PERIOD AS SHORTWAVE TROUGH NOW OVER THE NRN

PLNS CONTINUES E TO THE UPR GRT LKS AND EVOLVES INTO A CLOSED LOW.

COLD FRONT ASSOCIATED WITH NRN PLNS TROUGH SHOULD ADVANCE E/SE

ACROSS THE UPR/MID MS VLY AND SE/S ACROSS THE OZARKS/SRN PLNS

THROUGH TNGT...WHILE DIFFUSE WARM FRONT MOVES N/NE ACROSS THE

MIDWEST/OH VLY. THE COLD FRONT...AND OUTFLOW FROM OVERNIGHT MCSS IN

THE LWR MO/MID MS VLYS...SHOULD BE THE MAIN FOCI FOR STRONG/SVR TSTM

DEVELOPMENT THROUGH TUE.

..MIDWEST/OZARKS INTO MID/UPR MS AND TN VLYS TODAY/TNGT

OUTFLOW FROM OVERNIGHT MCS HAS COMPLICATED THE SFC PATTERN THIS

MORNING...MASKING AT LEAST TEMPORARILY THE TRUE LOCATION OF MID

MS/LWR OH VLY WARM FRONT. OVERALL...THE OUTFLOW SHOULD SERVE TO

RETARD NEWD MOTION OF THE NW-SE ORIENTED FRONT...WITH A REDUCED

DEGREE OF DIURNAL DESTABILIZATION EXPECTED NWD AND EWD INTO NRN

IND...OH...AND MI. BUT SFC HEATING IN WAKE OF MORNING STORMS SHOULD

SUPPORT AT LEAST MODERATE DESTABILIZATION /SBCAPE TO 3000 J PER

KG/...AND TSTM DEVELOPMENT BY THIS AFTN ALONG/AHEAD OF COLD FRONT

FROM SWRN/CNTRL/NE MO INTO WI/NRN IL...AND ALONG OUTFLOW BOUNDARY

ACROSS SRN PORTIONS OF IL/IND INTO KY. FARTHER N...A SEPARATE AREA

OF STRONG STORMS COULD PRECEDE MAIN UPR TROUGH/VORT OVER NE MN/NW

WI.

AMPLE /40+ KT/ DEEP SHEAR ASSOCIATED WITH BAND OF 40-50 KT MID LVL

WLY FLOW ON SRN SIDE OF NRN PLNS TROUGH WILL BE PRESENT TO SUPPORT

SUPERCELLS/SUSTAINED STORMS WITH HAIL...LOCALLY DMGG WIND...AND

POSSIBLY A COUPLE TORNADOES THROUGH EARLY EVE. BUT THE STORMS

SHOULD FAIRLY QUICKLY EVOLVE INTO CLUSTERS/BANDS...WITH EMBEDDED

BOWING SEGMENTS ULTIMATELY YIELDING ONE OR MORE CORRIDORS OF DMGG

WIND BY THIS EVE/TNGT...ESPECIALLY FROM CNTRL/SRN MO E OR ESE INTO

CNTRL/SRN IL...SRN IND...AND KY.

..CNTRL/SRN HI PLNS LATE THIS AFTN INTO TNGT

AN INCREASINGLY MOIST POST-FRONTAL UPSLOPE REGIME WILL DEVELOP LATER

TODAY/TNGT OVER THE CNTRL/SRN HI PLNS IN WAKE OF COLD FRONT SETTLING

S ACROSS THE PLNS. ISOLD TO SCTD TSTMS SHOULD FORM BY MID-LATE AFTN

OVER THE CO/NE NM FRONT RANGE/RATON MESA AREAS...WITH SUBSEQUENT

DEVELOPMENT POSSIBLE EWD INTO PORTIONS OF THE OK/TX PANHANDLES.

UPPER RIDGING WILL LIMIT DEVELOPMENT WITH SWD EXTENT. BUT

COMBINATION OF INCREASING POST-FRONTAL MOISTURE BENEATH EML PLUME ON

NRN FRINGE OF RIDGE...AND STRONGLY VEERING WIND PROFILES...SHOULD

SUPPORT AT LEAST A FEW SUPERCELLS AND MULTICELL CLUSTERS WITH

HAIL...LOCALLY DMGG WIND...AND PERHAPS A TORNADO.

FARTHER EAST...ISOLD HIGH-BASED STORMS WITH HAIL/LOCALLY DMGG WIND

MAY FORM LATE THIS AFTN EWD ALONG THE COLD FRONT INTO THE TX

PANHANDLE/WRN OK...IF FRONTAL UPLIFT IS SUFFICIENT TO BREAK STOUT

CAP. THIS REGION ALSO COULD SEE A FEW LATE NGT/EARLY MORNING STORMS

AS SLY LLJ NOCTURNALLY STRENGTHENS AND ASCENDS STALLING FRONT.

..SERN STATES THIS AFTN

AN AXIS OF RELATIVELY UNSTABLE/NOT RECENTLY OVERTURNED AIR EXISTS

ALONG THE SC/NC CSTL PLN AND THE SE CORNER OF VA...ALONG AND S OF

WEAK QSTNRY FRONT. ANOTHER AXIS OF GREATER SFC-BASED INSTABILITY IS

PRESENT FROM WRN TN SSE INTO NRN/CNTRL MS AND WRN AL. SCTD TSTMS

LIKELY WILL FORM WITH SFC HEATING OVER THESE CORRIDORS THIS AFTN.

WEAK FLOW ALOFT AND CONTINUING PRESENCE OF EML ON ERN FRINGE OF PLNS

RIDGE SUGGEST THE POTENTIAL FOR SCTD PULSE-TYPE STORMS WITH LOCALLY

DMGG WIND/MARGINALLY SVR HAIL...AND THE POSSIBILITY FOR UPSCALE

DEVELOPMENT INTO ONE OR TWO S OR SW-MOVING CLUSTERS OVER TIME.

..CORFIDI/GRAMS.. 06/27/2011

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Starting off the day, cool and cloudy. Yet another 90+ degree day advertised in the med range that fails because of difficulties handling mesoscale interactions. I think we see a pretty aggresive trim back on the northern end of the slight risk, this is rather expansive.

Not yet anyway. Actually a northward expansion (NW WI - E/NE MN). ;)

Sun coming out here this morning...for now.

EDIT: Jim beat me to the punch.

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My biggest pet peeve regarding severe weather is when an MCS falls apart right before it arrives here on a day of potential strong storms, but the clouds are still abundant, retarding the chance for destabilization. Worst of both worlds: chance for initial MCS wanes, yet later chances wane as well.

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Well the damage assessment from here could have just been copied and pasted from a half dozen other MCSs this year. I lost some more shingles and some of my siding was popped off as well as a shutter. Maybe by the end of the summer the insurance company will give me money for a whole new roof instead of the half they gave me earlier in the year. lol Shingle damage seems to be the norm in the neighborhood, most houses have some. Also some tree limbs down. Sounds like just to the north in Adam's county got the worst of it. The sound last night was unbelievable, I really expected much worse outside.

Small slide show from the news in Quincy. http://www.wgem.com/Global/story.asp?S=14979822

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Does appear to be breaking up according to VIS SAT loop though...

Starting off the day, cool and cloudy. Yet another 90+ degree day advertised in the med range that fails because of difficulties handling mesoscale interactions. I think we see a pretty aggresive trim back on the northern end of the slight risk, this is rather expansive.

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It's trying and late June sun should be fairly effective in destabilizing things, but we have a long ways to go. Still think activity remains rather scattered.

It probably will, but at this point I'll take anything I can get. The sun is definitely peeking through pretty well, and if we can get in the upper 70s, the juice will be there to develop something potentially significant.

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Can't help but feel today will be a bust day for the Dayton area. Air is very stable here and light rain/MCS debris is keeping a lid on surface heating. We really need the warm front to lift soon to help...or else anything that heads this way this afternoon/evening will weaken.

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Models are handling this precip horribly...will be a wait and watch day...cloud deck is beginning to thin on the northern half...

Yeah, models have backed off on instability with northward extent but it's really wait and see. Should continue to see breaks in the clouds with some subsidence behind the early morning complex, but overall I'm probably a little less enthused than yesterday at this time.

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BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE PADUCAH KY

1215 PM CDT MON JUN 27 2011

THE NATIONAL WEATHER SERVICE IN PADUCAH HAS ISSUED A

* TORNADO WARNING FOR...

SOUTHEASTERN POPE COUNTY IN SOUTHERN ILLINOIS...

SOUTHERN LIVINGSTON COUNTY IN WESTERN KENTUCKY...

* UNTIL 1245 PM CDT.

* AT 1213 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR

HAMLETSBURG...MOVING EAST AT 35 MPH.

* LOCATIONS INCLUDE...

SMITHLAND...

HAMLETSBURG...

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Dr Greg Forbes has a TOR:CON of 4 for E. Wisconsin today. While we should be pretty close to the warm front, I find it unlikely the odds are really that good.

Deep layer shear is good with some nice directional shear especially in the low levels. Main question is how much destabilization occurs that far north.

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