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July 26-27 Severe Threat


Hoosier

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MESOSCALE DISCUSSION 1481

NWS STORM PREDICTION CENTER NORMAN OK

1152 AM CDT SUN JUL 27 2014

AREAS AFFECTED...OH

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 271652Z - 271815Z

PROBABILITY OF WATCH ISSUANCE...60 PERCENT

SUMMARY...STORMS ARE EXPECTED TO INCREASE IN COVERAGE AND INTENSITY

NEXT FEW HOURS ACROSS OH. THREAT WILL EXIST FOR LARGE

HAIL...DAMAGING WIND AND PERHAPS A COUPLE TORNADOES. TRENDS ARE

BEING MONITORED FOR A WW.

DISCUSSION...STORMS THAT INITIATED IN THE WARM ADVECTION REGIME

CONTINUES TO SPREAD EWD THROUGH WRN OH. UPDRAFTS HAVE BEEN

ELEVATED...BUT STORMS MAY SOON BECOME SFC BASED AS THE BOUNDARY

LAYER DESTABILIZES AND TEMPERATURES RISE THROUGH THE 80S. A STRONG

MID-LEVEL JET MOVING EWD THROUGH THE OH VALLEY IS SUPPORTING 40-50

KT EFFECTIVE SHEAR WITH DEEP-LAYER WIND PROFILES MOSTLY

UNIDIRECTIONAL. HOWEVER...VWPS INDICATE SOME VEERING BETWEEN THE SFC

AND 2 KM WITH STORM RELATIVE HELICITY FROM 150-200 M2/S2. AS STORMS

BECOME SFC BASED...THEY WILL LIKELY EVOLVE INTO SUPERCELLS AND

BOWING SEGMENTS CAPABLE OF PRODUCING LARGE HAIL...DAMAGING WIND AND

PERHAPS A COUPLE TORNADOES.

..DIAL/HART.. 07/27/2014

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mcd1482.gif

 

MESOSCALE DISCUSSION 1482
NWS STORM PREDICTION CENTER NORMAN OK
1154 AM CDT SUN JUL 27 2014

AREAS AFFECTED...MUCH OF CNTRL/ERN LOWER MI

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 271654Z - 271800Z

PROBABILITY OF WATCH ISSUANCE...60 PERCENT

SUMMARY...ISOLATED INSTANCES OF NEAR-SVR HAIL...STRONG WIND
GUSTS...AND POSSIBLY A BRIEF TORNADO MAY ACCOMPANY ONGOING TSTMS
ACROSS NRN LOWER MI. ADDITIONAL TSTM DEVELOPMENT IS EXPECTED FARTHER
S INTO S-CNTRL/SERN PORTIONS OF LOWER MI THROUGH
MID-AFTERNOON...WHERE DMGG WIND GUSTS AND LARGE HAIL ARE POSSIBLE.
TRENDS ARE BEING MONITORED FOR A POSSIBLE WW.

DISCUSSION...RADAR MOSAIC LOOP SHOWS A COUPLE LOW-TOPPED SUPERCELLS
HAVE DEVELOPED OVER NRN LOWER MI...INCLUDING ONE OVER CRAWFORD
COUNTY AND ANOTHER OVER OTSEGO COUNTY. THESE TSTMS ARE OCCURRING
NEAR/AHEAD OF A SFC LOW POSITIONED NEAR NRN LM...AND AN ATTENDANT
SFC TROUGH EXTENDING SWD INTO WRN LOWER MI. DESPITE SFC TEMPERATURES
CURRENTLY NEAR 70 F...COLD TEMPERATURES ALOFT ADVECTING
EWD...ASSOCIATED WITH A STRONG UPPER LOW S OF LS...ARE SUPPORTING AN
INCREASINGLY UNSTABLE AIR MASS ACROSS THE REGION...WITH MLCAPE
VALUES APPROACHING 1000 J/KG OVER NRN LOWER MI. APX VWP DATA SHOWS
LOCALLY BACKED S-SELY LOW-LEVEL WINDS VEERING TO WLY ABOVE 1 KM
AGL...WITH SUFFICIENT DEEP-LAYER SHEAR IN PLACE TO CONTINUE
SUPPORTING LOW-TOPPED SUPERCELLS. PRIMARY THREATS ARE LIKELY TO BE
NEAR-SVR HAIL AND WIND GUSTS...AND PERHAPS A BRIEF TORNADO. THESE
THREATS WILL SHIFT TOWARDS THE WRN SHORE OF LH OVER THE NEXT COUPLE
HRS.

FARTHER S...INCLUDING S-CNTRL/SERN LOWER MI...ELEVATED SHOWERS ARE
ONGOING...BUT POCKETS OF STRONGER HEATING ARE OCCURRING. AN INCREASE
IN TSTM COVERAGE/INTENSITY IS EXPECTED OVER THE NEXT COUPLE HRS
ACROSS THIS AREA AS STRONGER FORCING FOR ASCENT ACCOMPANYING THE
UPPER TROUGH OVERSPREADS THE REGION. WITH LOW-LEVEL WINDS MORE
VEERED/WLY...PRIMARY THREATS WILL LIKELY BE SVR WIND GUSTS AND LARGE
HAIL.

CONVECTIVE TRENDS ASSOCIATED WITH ONGOING TSTMS ACROSS NRN LOWER
MI...AND AN EXPECTED INCREASE IN TSTMS FARTHER S...WILL CONTINUE TO
BE MONITORED FOR A POSSIBLE WW ISSUANCE OVER THE NEXT COUPLE HRS.

..ROGERS/HART.. 07/27/2014


ATTN...WFO...DTX...APX...IWX...GRR...

LAT...LON 42938242 42268291 41848329 41878389 41848439 41938494
43828524 44798521 45058543 45518500 45668482 45618418
45298333 45048332 43978261 42938242 

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ESRH has increased into the 200-400 m2/s2 range in central KY with 50-60 kts of effective shear beginning to overlap the warm sector. Those discrete storms should intensify with mid 70s dewpoints available over the tornado watch area.

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I wouldn't be surprised to see more tornadic t'storms across MI as the low pressure center deepens, improving directional shear.

 

I'm a bit surprised the SPC/WFOs didn't go with a Tornado Watch versus a Severe T'storm Watch, given the warnings that have been issued and the rotation storms have shown so far...

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While a short window, the LAF crew may get in on some brief action after all...

 

mcd1483.gif

 

MESOSCALE DISCUSSION 1483
NWS STORM PREDICTION CENTER NORMAN OK
0139 PM CDT SUN JUL 27 2014

AREAS AFFECTED...FAR E-CNTRL IL...CNTRL IND

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 271839Z - 271945Z

PROBABILITY OF WATCH ISSUANCE...40 PERCENT

SUMMARY...TRENDS ARE BEING MONITORED FOR AN INCREASE IN TSTM
DEVELOPMENT ALONG A COLD FRONT OVER E-CNTRL IL...AND A PRE-FRONTAL
SFC TROUGH OVER CNTRL IND. THE ENVIRONMENT IS CONDITIONALLY
FAVORABLE FOR DMGG WIND GUSTS AND LARGE HAIL...AND A WW IS POSSIBLE
IN THE NEXT 1-2 HRS.

DISCUSSION...VISIBLE SATELLITE IMAGERY SHOWS A PERCOLATING CU FIELD
ALONG A SEWD MOVING COLD FRONT...WHICH WAS POSITIONED FROM JUST W OF
VPZ TO NEAR DEC AS OF 1830Z. ADDITIONAL CU WAS DEVELOPING INVOF A
WEAK SFC TROUGH/WIND SHIFT S/W OF THE INDIANAPOLIS AREA. THESE AREAS
ARE REMOVED FROM THE STRONGEST FORCING ALOFT...AS AN UPPER JET IS
NOSING INTO NRN IL AND W-CNTRL IND THIS AFTERNOON...WHICH MAY LIMIT
TSTM DEVELOPMENT/COVERAGE OVER THE NEXT FEW HOURS. HOWEVER...STRONG
HEATING AMIDST MODERATELY STEEP MIDLEVEL LAPSE RATES IS YIELDING
MLCAPE VALUES OF 1500-2000 J/KG. LONG AND STRAIGHT HODOGRAPHS
ENHANCED BY ANOMALOUSLY STRONG MIDLEVEL FLOW WILL BE CONDITIONALLY
FAVORABLE FOR SUPERCELLS...WITH THE POTENTIAL FOR PRODUCING LARGE TO
VERY LARGE HAIL AND DMGG WIND GUSTS. PRIMARY UNCERTAINTY REGARDING
POSSIBLE WW ISSUANCE SURROUNDS TSTM COVERAGE THIS AFTERNOON AND
EVENING...BUT TRENDS WILL BE CLOSELY MONITORED.

..ROGERS/HART.. 07/27/2014


ATTN...WFO...IND...ILX...

LAT...LON 38808770 39198797 40148781 40438737 40448694 40318583
40078554 39578543 38888578 38718684 38808770

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Storm now warned..

 

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN CLAY AND

SOUTHEASTERN JACKSON COUNTIES UNTIL 315 PM EDT...

 

AT 250 PM EDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO

WAS LOCATED NEAR SETTLE STORE...AND MOVING EAST AT 45 MPH.

 

HAZARD...TORNADO AND QUARTER SIZE HAIL.

 

SOURCE...RADAR INDICATED ROTATION.

 

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT

         SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE

         TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS

         LIKELY.

 

THIS DANGEROUS STORM WILL BE NEAR...

  CHESTNUTBURG AND SEXTONS CREEK AROUND 300 PM EDT.

  FELTY AND THOMAS AROUND 305 PM EDT.

  ONEIDA AND AMMIE AROUND 310 PM EDT.

  BRUTUS AND SPURLOCK AROUND 315 PM EDT.

 

OTHER LOCATIONS IN THE WARNING INCLUDE HIGH KNOB...ALGER AND ERILINE.

 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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Funnel cloud with it.

 

 

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
306 PM EDT SUN JUL 27 2014

THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A

* TORNADO WARNING FOR...
NORTHERN MADISON COUNTY IN CENTRAL OHIO...
SOUTHWESTERN UNION COUNTY IN CENTRAL OHIO...
NORTHERN CHAMPAIGN COUNTY IN WEST CENTRAL OHIO...
SOUTHEASTERN LOGAN COUNTY IN WEST CENTRAL OHIO...

* UNTIL 330 PM EDT.

* AT 303 PM EDT...A SPOTTER REPORTED A FUNNEL CLOUD IN SOUTHERN
LOGAN...NORTHERN CHAMPAIGN COUNTY. THE FUNNEL CLOUD COULD
TOUCHDOWN AT ANY TIME. RADAR INDICATED THAT THIS DANGEROUS STORM
WAS LOCATED NEAR WEST LIBERTY...MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
WEST LIBERTY...
MARYSVILLE...

IN ADDITION...LIPPINCOTT...ZANESFIELD...VALLEY HI...PICKRELLTOWN...
KENNARD...MINGO...CABLE AND EAST LIBERTY ARE NEAR THE PATH OF THIS
DANGEROUS THUNDERSTORM.
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TOR warned storm going toward my aunt's place in Linwood... anybody see a couplet? All I have is plain ol' NEXRAD. :(

 

 

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
236 PM EDT SUN JUL 27 2014

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A

* TORNADO WARNING FOR...
SOUTHERN BAY COUNTY IN SOUTHEAST MICHIGAN...

* UNTIL 330 PM EDT

* AT 234 PM EDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS LOCATED NEAR MIDLAND...AND MOVING EAST AT 25 MPH.

HAZARD...TORNADO AND GOLF BALL SIZE HAIL.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE
TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS
LIKELY.

* THIS DANGEROUS STORM WILL BE NEAR...
KAWKAWLIN AND LINWOOD AROUND 300 PM EDT.
BAY CITY STATE RECREATION AREA AROUND 305 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4378 8392 4374 8394 4368 8391 4365 8386
4365 8381 4363 8377 4357 8417 4373 8416
4379 8393
TIME...MOT...LOC 1836Z 256DEG 22KT 4363 8414

TORNADO...RADAR INDICATED
HAIL...1.75IN

$

SF

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