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June 21-27 Severe Weather


Chicago Storm

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BULLETIN - EAS ACTIVATION REQUESTED

SEVERE THUNDERSTORM WARNING

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL

409 PM CDT MON JUN 24 2013

 

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

 

* SEVERE THUNDERSTORM WARNING FOR...

  NORTHWESTERN LA SALLE COUNTY IN NORTH CENTRAL ILLINOIS...

  LEE COUNTY IN NORTH CENTRAL ILLINOIS...

  OGLE COUNTY IN NORTH CENTRAL ILLINOIS...

 

* UNTIL 515 PM CDT

 

* AT 404 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE

  EXTENDING FROM 18 MILES WEST OF COLETA TO 13 MILES SOUTHWEST OF

  TAMPICO TO 14 MILES WEST OF OSCEOLA...AND MOVING NORTHEAST AT 60

  MPH.

 

  THESE ARE VERY DANGEROUS STORMS.

 

  HAZARD...80 MPH WIND GUSTS.

 

  SOURCE...RADAR INDICATED.

 

  IMPACT...MOBILE HOMES WILL BE HEAVILY DAMAGED. FLYING DEBRIS WILL

           BE DANGEROUS TO PEOPLE AND ANIMALS. EXPECT CONSIDERABLE

           DAMAGE TO ROOFS...WINDOWS AND VEHICLES. EXTENSIVE TREE

           DAMAGE AND POWER OUTAGES ARE LIKELY.

 

* SEVERE THUNDERSTORMS WILL BE NEAR...

  WALTON AND POLO AROUND 435 PM CDT.

  MOUNT MORRIS AND AMBOY AROUND 440 PM CDT.

  OREGON AND FRANKLIN GROVE AROUND 445 PM CDT.

  ASHTON AROUND 450 PM CDT.

  LA SALLE AND STILLMAN VALLEY AROUND 455 PM CDT.

  ROCHELLE AND PAW PAW AROUND 500 PM CDT.

 

OTHER LOCATIONS IN THE WARNING INCLUDE NELSON...HARMON...SUBLETTE...

WEST BROOKLYN...COMPTON...TROY GROVE AND STEWARD.

 

I-88 BETWEEN MILE MARKERS 45 AND 81.

I-80 BETWEEN MILE MARKERS 73 AND 83.

I-39 BETWEEN MILE MARKERS 58 AND 103.

 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

 

THIS IS AN EXTREMELY DANGEROUS SITUATION WITH TORNADO LIKE WIND

SPEEDS EXPECTED. IN ADDITION...INTENSE SQUALL LINES CAN SOMETIMES 

PRODUCE BRIEF TORNADOES IN ADDITION TO...WIDESPREAD SIGNIFICANT WIND 

DAMAGE. ALTHOUGH A TORNADO IS NOT IMMEDIATELY LIKELY...IT IS BEST TO 

MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A BUILDING. THIS 

STORM MAY CAUSE SERIOUS INJURY AND SIGNIFICANT PROPERTY DAMAGE.

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LOT...

 

THE AIR MASS OVER NORTHERN ILLINOIS IN THE PROCESS OF RAPIDLY
DESTABILIZING WITH OBJECTIVE ANALYSIS INDICATING MLCAPES LIKELY
INCREASING ABOVE 2000 J/KG. SYNOPTICALLY...DEEP LAYER SHEAR IS NOT
TERRIBLY IMPRESSIVE...HOWEVER WELL DEVELOPED MCV WITH 50-60KT FLOW
NOTED ON KDSM WSR-88D VWP SO IT IS BYOS (BRING YOUR OWN SHEAR)
WITH THIS MCS. WHILE DAMAGING WINDS...POSSIBLY FAIRLY
WIDESPREAD...WILL BE THE PRIMARY THREAT...THERE HAVE BEEN SEVERAL
STRONG MESOVORTICES WITH THIS BOW WITH AT LEAST ONE APPARENT TDS
DETECTED WITH KDVN DUAL POL IMAGERY. VISIBLE SATELLITE IMAGERY
SHOWS AND SFC OBS SHOW A WELL DEVELOPED RETREATING REMANENT
OUTFLOW BOUNDARY LIFTING NORTH ACROSS THE CWA EXTENDING FROM NEAR
KRZL TO NEAR KSQI AT 21Z. WHILE MV'S AND QLCS TYPE TORNADOES ARE
POSSIBLE NEAR AND NORTH OF THE APEX OF THE BOW...THIS BOUNDARY MAY
VERY WELL END UP BEING A FOCAL POINT FOR THE STRONGEST/LONGEST
LIVED MV POTENTIAL ALONG WITH THE GREATEST THREAT FOR QLCS TYPE
TORNADOES.

IZZI 

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I'm thinking Geosland and just south has the best potential with this. The only question is how those easterly winds will affect the squall line coming in. Timing won't be an issue.

strong ssw winds right at the lake front downtown. no marine influence.

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0326 PM TORNADO MUSCATINE 41.42N 91.07W
06/24/2013 MUSCATINE IA EMERGENCY MNGR

DAMAGE ON THE FAR NORTH SIDE OF MUSCATINE NEAR HIGHWAY
61. MULTIPLE SEMIS OVERTURNED AND OTHER VEHICLES FLIPPED.
BUILDINGS SHEARED OFF AND ROOFS OFF. NO INJURIES REPORTED
AT THIS TIME.  
 

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I'm thinking Geosland and just south has the best potential with this.  The only question is how those easterly winds will affect the squall line coming in.  Timing won't be an issue.

 

Winds have shifted offshore again here. Sticky, higher dewpoint airmass has moved back in. 82 here right now.

 

It's been a battle for the last 2 hours, but the offshore flow is taking over.

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