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2015 Short Term Severe Weather Discussion


Hoosier

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Tornado Watch coming per new MD. 80% probability.

 

mcd0606.gif

 

AREAS AFFECTED...PORTIONS OF OHIO...INDIANA...SOUTHERN LOWER
MICHIGAN...FAR NORTHERN KENTUCKY

CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY

VALID 111648Z - 111915Z

PROBABILITY OF WATCH ISSUANCE...80 PERCENT

SUMMARY...PORTIONS OF THE LOWER GREAT LAKES AND OHIO VALLEY REGION
ARE BEING MONITORED FOR AN INCREASING RISK OF SEVERE THUNDERSTORMS
INCLUDING THE POTENTIAL FOR A FEW TORNADOES. THE ISSUANCE OF A
TORNADO WATCH IS LIKELY.

DISCUSSION...A CLUSTER OF CONVECTION INTENSIFYING ACROSS SOUTHERN
INDIANA CAN BE TRACED BACK TO A LONG-LIVED CONVECTIVE CIRCULATION
EMANATING FROM SOUTHERN-PLAINS DIURNALLY ENHANCED THUNDERSTORMS FROM
YESTERDAY AFTERNOON. THIS ACTIVITY CONTINUES CYCLING -- HAVING
WEAKENED IN RESPONSE TO NOCTURNAL COOLING -- AND SHOULD CONTINUE TO
RE-INTENSIFY AS IT TRACKS NEWD ACROSS PARTS OF INDIANA AND WRN OHIO
TO SRN LOWER MI. THIS ZONE ALIGNS WITH VIS-IMAGERY-IMPLIED...
DIURNALLY ENHANCED BAROCLINICITY OWING TO DIFFERENTIAL HEATING
ACROSS THE REMNANT CLOUD SHIELD FROM MORE WIDESPREAD DECAYED
CONVECTION. AS BAROCLINIC CIRCULATIONS INTENSIFY THROUGH THE
AFTERNOON...AND THE AIR MASS BECOMES INCREASINGLY UNSTABLE AMIDST
LOWER 60S SFC DEWPOINTS...OTHER CONVECTION WILL INCREASE IN COVERAGE
AND INTENSITY WITHIN A WARM SECTOR S OF A SYNOPTIC WARM FRONT
ADVANCING NWD ACROSS SRN LOWER MI.

MLCAPE WITHIN THE WARM SECTOR AIR IS PROJECTED TO PEAK AROUND
1000-1500 J/KG...WHILE 30-50 KT OF EFFECTIVE BULK SHEAR SUPPORTS
SMALL...FAST MOVING BOWING SEGMENTS CAPABLE OF DMGG WIND GUSTS. THE
IND VWP SAMPLES 45-55 KT OF FLOW IN THE 1-3-KM-AGL LAYER...ENHANCING
THE RISK FOR DMGG WIND GUSTS BY CONVECTIVE MOMENTUM TRANSPORT. WHILE
DIRECTIONAL SHEAR/HODOGRAPH CURVATURE WILL BE LIMITED IN GENERAL --
EXCEPT INVOF THE MI WARM FRONT -- THE MAGNITUDE OF LOW-LEVEL SHEAR
WILL BE SUFFICIENT FOR A TORNADO RISK WITH ANY SUSTAINED SUPERCELL
STORMS / LEWP INFLECTIONS. SUCH RISK WILL BE GREATEST NEAR BACKED
SFC FLOW INVOF THE WARM FRONT.

..COHEN/CORFIDI.. 05/11/2015

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Tornado Watch coming per new MD. 80% probability.

 

http://www.spc.noaa.gov/products/md/md0606.html

 

MESOSCALE DISCUSSION 0606

   NWS STORM PREDICTION CENTER NORMAN OK

   1148 AM CDT MON MAY 11 2015

   AREAS AFFECTED...PORTIONS OF OHIO...INDIANA...SOUTHERN LOWER

   MICHIGAN...FAR NORTHERN KENTUCKY

   CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY

   VALID 111648Z - 111915Z

   PROBABILITY OF WATCH ISSUANCE...80 PERCENT

   SUMMARY...PORTIONS OF THE LOWER GREAT LAKES AND OHIO VALLEY REGION

   ARE BEING MONITORED FOR AN INCREASING RISK OF SEVERE THUNDERSTORMS

   INCLUDING THE POTENTIAL FOR A FEW TORNADOES. THE ISSUANCE OF A

   TORNADO WATCH IS LIKELY.

   DISCUSSION...A CLUSTER OF CONVECTION INTENSIFYING ACROSS SOUTHERN

   INDIANA CAN BE TRACED BACK TO A LONG-LIVED CONVECTIVE CIRCULATION

   EMANATING FROM SOUTHERN-PLAINS DIURNALLY ENHANCED THUNDERSTORMS FROM

   YESTERDAY AFTERNOON. THIS ACTIVITY CONTINUES CYCLING -- HAVING

   WEAKENED IN RESPONSE TO NOCTURNAL COOLING -- AND SHOULD CONTINUE TO

   RE-INTENSIFY AS IT TRACKS NEWD ACROSS PARTS OF INDIANA AND WRN OHIO

   TO SRN LOWER MI. THIS ZONE ALIGNS WITH VIS-IMAGERY-IMPLIED...

   DIURNALLY ENHANCED BAROCLINICITY OWING TO DIFFERENTIAL HEATING

   ACROSS THE REMNANT CLOUD SHIELD FROM MORE WIDESPREAD DECAYED

   CONVECTION. AS BAROCLINIC CIRCULATIONS INTENSIFY THROUGH THE

   AFTERNOON...AND THE AIR MASS BECOMES INCREASINGLY UNSTABLE AMIDST

   LOWER 60S SFC DEWPOINTS...OTHER CONVECTION WILL INCREASE IN COVERAGE

   AND INTENSITY WITHIN A WARM SECTOR S OF A SYNOPTIC WARM FRONT

   ADVANCING NWD ACROSS SRN LOWER MI.

   MLCAPE WITHIN THE WARM SECTOR AIR IS PROJECTED TO PEAK AROUND

   1000-1500 J/KG...WHILE 30-50 KT OF EFFECTIVE BULK SHEAR SUPPORTS

   SMALL...FAST MOVING BOWING SEGMENTS CAPABLE OF DMGG WIND GUSTS. THE

   IND VWP SAMPLES 45-55 KT OF FLOW IN THE 1-3-KM-AGL LAYER...ENHANCING

   THE RISK FOR DMGG WIND GUSTS BY CONVECTIVE MOMENTUM TRANSPORT. WHILE

   DIRECTIONAL SHEAR/HODOGRAPH CURVATURE WILL BE LIMITED IN GENERAL --

   EXCEPT INVOF THE MI WARM FRONT -- THE MAGNITUDE OF LOW-LEVEL SHEAR

   WILL BE SUFFICIENT FOR A TORNADO RISK WITH ANY SUSTAINED SUPERCELL

   STORMS / LEWP INFLECTIONS. SUCH RISK WILL BE GREATEST NEAR BACKED

   SFC FLOW INVOF THE WARM FRONT.

   ..COHEN/CORFIDI.. 05/11/2015

   ATTN...WFO...CLE...ILN...DTX...LMK...IWX...GRR...IND...

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Potential looking pretty good locally, we still have a warm front in the area, and the mesoscale models want to locally back the wind at the surface as a low forms in the state in a couple hours. That will really pump up the low-level helicity.

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And the Watch is out until 8:00. And dang, the first Warning is out already.

 

THE NATIONAL WEATHER SERVICE IN NORTHERN INDIANA HAS ISSUED A

* TORNADO WARNING FOR...
NORTHWESTERN ADAMS COUNTY IN NORTHEAST INDIANA...
SOUTHEASTERN ALLEN COUNTY IN NORTHEAST INDIANA...
NORTHEASTERN WELLS COUNTY IN NORTHEAST INDIANA...

* UNTIL 145 PM EDT

* AT 111 PM EDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS LOCATED NEAR OSSIAN...AND MOVING NORTHEAST AT 45 MPH.

HAZARD...TORNADO.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE TO
ROOFS...WINDOWS AND VEHICLES WILL OCCUR. FLYING DEBRIS
WILL BE DEADLY TO PEOPLE AND ANIMALS. TREE DAMAGE IS
LIKELY.

* LOCATIONS IMPACTED INCLUDE...
OSSIAN...NEW HAVEN...MONROEVILLE...MAGLEY...YODER...POE...
MIDDLETOWN...HESSEN CASSEL...WILLIAMS...HOAGLAND...MAPLES...
TILLMAN...ZULU AND TOWNLEY.

THIS INCLUDES INTERSTATE 469 BETWEEN MILE MARKERS 0 AND 25.

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And the Watch is out until 8:00. And dang. The first Warning is out already.

That cell looks like it is a hair behind a slowing outflow boundary, once it catches it, the storm should produce. The atmosphere ahead of that boundary is pretty rich.

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That cell looks like it is a hair behind a slowing outflow boundary, once it catches it, the storm should produce. The atmosphere ahead of that boundary is pretty rich.

 

That's exactly what I am thinking. Thing should explode in a good amount of time. Keeping my eyes on the southern cells as well. Just a waiting game at this point.

 

Rotation being reported by PD and other sources near 469 in Allen County.

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2 cells south of the warned cell are getting better organized. All 3 of these cells would be heading toward the Detroit-Toledo-Findley corridor in about 2-3 hours.

 

May be out of school by then and book north. These look like they'll miss me by 2-3 miles on their current path. 

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