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June 21-27 Severe Weather


Chicago Storm

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BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
600 PM EDT TUE JUN 25 2013

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN KALAMAZOO COUNTY IN SOUTHWEST MICHIGAN...

* UNTIL 700 PM EDT

* AT 559 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR
  SCHOOLCRAFT...AND MOVING EAST AT 20 MPH.

  HAZARD...60 MPH WIND GUSTS...PENNY SIZE HAIL AND POSSIBLE TORNADO.

  SOURCE...RADAR INDICATED.

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PORTAGE AROUND 605 PM EDT.
  VICKSBURG AROUND 610 PM EDT.
  FULTON AROUND 645 PM EDT.

 

Shouldn't this be a tornado warning then?

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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
0444 PM CDT TUE JUN 25 2013

 

..LEE COUNTY ILLINOIS DAMAGE SURVEY RESULTS

NATIONAL WEATHER SERVICE PERSONNEL SURVEYED DAMAGE FROM THE STORMS
ON JUNE 24TH IN WESTERN AND CENTRAL LEE COUNTY IN NORTHERN ILLINOIS.
CONCENTRATED HIGHER END STRAIGHT-LINE WIND DAMAGE OCCURRED IN A
SWATH ACROSS THIS AREA...ALONG WITH A BRIEF TORNADO TO THE IMMEDIATE
NORTH OF THAT AREA.

LOOKING FIRST AT THE TORNADO:

* MAXIMUM EF-SCALE RATING: EF-0

* FATALITIES: NONE

* INJURIES: NONE

* BEGIN TIME/LOCATION: 06/24/2013...432 PM CDT /ESTIMATED/
2S OF HARMON IL
LAT 41.6995 LONG -89.5562

* END TIME/LOCATION: 06/24/2013...436 PM CDT /ESTIMATED/
2.5 ENE OF HARMON IL
LAT 41.7261 LONG -89.5154

* MAXIMUM ESTIMATED WIND SPEED: 85 MPH

* PATH LENGTH: 4 MILES

* MAXIMUM PATH WIDTH: 100 YARDS

* DISCUSSION/DAMAGE:

THIS PATH WAS MAINLY OVER FARM FIELDS BUT DID TAKE DOWN NUMEROUS
UTILITY POLES...INCLUDING A FEW THAT WERE BENT SHARPLY TO THE
SOUTH...OPPOSITE OF THE STORM MOTION WHICH WAS NORTHEAST. THESE
ALIGNED WITH THE NORTH PART OF THE DAMAGE SWATH. ONE WEAKLY
CONSTRUCTED BARN WAS DESTROYED NEAR THE END OF THIS PATH. DAMAGE TO
THE CORN CANOPY AT CROSSROADS ALONG THIS PATH REVEALED A MORE
CONVERGENT SIGNATURE INDICATIVE OF A SHORT-LIVED TORNADO.

LOOKING NOW AT THE CONCENTRATED STRAIGHT-LINE WINDS:

* EVENT: STRAIGHT-LINE WINDS

* FATALITIES: NONE

* INJURIES: NONE

* BEGIN TIME/LOCATION: 06/24/2013...429 PM CDT /ESTIMATED/
7SW OF WALTON IL
LAT 41.6690 LONG -89.5390

* END TIME/LOCATION: 06/24/2013...440 PM CDT /ESTIMATED/
1NNW OF AMBOY IL
LAT 41.7240 LONG -89.3359

* MAXIMUM ESTIMATED WIND SPEED: 100 MPH

* LENGTH OF WIND SWATH: ROUGHLY 13 MILES

* DISCUSSION/DAMAGE:

THROUGHOUT THIS SWATH INDICATIONS WERE THAT WIND GUSTS WERE IN
EXCESS OF 60 MPH WITH MULTIPLE LOCATIONS OBSERVING SPEEDS IN EXCESS
OF 80 MPH. AT TIMES DAMAGE WAS SOMEWHAT SPORADIC AND IN ZIG-ZAG TYPE
ORIENTATION...BUT OVERALL THIS WAS A SEMI-CONTINUOUS CORRIDOR ABOUT
ONE TO ONE AND A HALF MILES IN WIDTH. DEBRIS AND FALLEN TREE
PLACEMENT TO THE NORTHEAST...ALL CORN FLATTENING OR BENDING TO THE
NORTHEAST...AND MOST EYE-WITNESS REPORTS INDICATE THIS WAS FROM
STRAIGHT-LINE WINDS.

NEAR THE BEGINNING OF THIS ENHANCED WIND AREA...A LARGE OUTBUILDING
WHICH WAS BOLTED TO ITS FOUNDATION WAS DESTROYED WITH SEVERAL LARGE
PIECES BEING LIFTED AND THROWN DOWNSTREAM. ONE PART OF THE BARN WALL
WAS LIFTED UP AND TOOK A PIECE OF THE FOUNDATION WITH IT. SLIGHTLY
DOWNSTREAM A LARGE TREE WAS SNAPPED NEAR ITS BASE AT A PROPERTY WITH
THE TREE FALLING ON THE FRONT PORTION OF THE HOUSE. IN WALTON...FOUR
LARGE GRAIN STORAGE BINS WERE DESTROYED ALONG WITH A METAL
OUTBUILDING. THE DEBRIS FROM THIS WAS FLUNG DOWNSTREAM...INCLUDING A
FEW PIECES BEING IMPALED IN THE REMAINING STANDING PART OF THE
ELEVATOR WHICH WAS ON THE EAST MOST SIDE OF THE PROPERTY. TWO OF
THE BINS WERE BASICALLY FOLDED IN ON EACH OTHER. NEAR THE END OF
THIS SWATH...THERE WERE A HANDFUL OF LARGE TREES SNAPPED WITH
NUMEROUS UPROOTED. 
 

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Storms starting to pop in far NE Iowa and SW WI. They don't look terribly organized at this point.

87/75 imby... Impressive (and oppressive) without much sun.

I am hoping that will be the main development for Chicago and Michiana.  The complex in central IL is moving more east than north.  I do have svr cells north of me in Michigan that are beautiful cauliflowers right now though.

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AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
530 PM CDT TUE JUN 25 2013

MESOSCALE UPDATE...

MAIN FOCUS FOR SEVERE CONVECTION CONTINUES TO BE ON CLUSTER OF
STRONG THUNDERSTORMS CURRENTLY MOVING ACROSS CENTRAL IL AND ALONG
THE SOUTHERN PERIPHERY OF THE WFO LOT CWA. VISIBLE SATELLITE IMAGERY
SHOWS EVIDENCE OF AN MCV MOVING ACROSS THE MISSISSIPPI RIVER JUST
NORTH OF THE QUAD CITIES...LIKELY HELPING MAINTAIN THIS CONVECTIVE
CLUSTER. 22Z SFC ANALYSIS DEPICTS OLD COMBINED SYNOPTIC/OUTFLOW
BOUNDARY HAD LIFTED NORTH OF THESE STORMS...WITH 3000-3500 J/KG
MLCAPE VALUES INDICATED BY SPC/RAP MESOANALYSIS TOOLS. EFFECTIVE
BULK SHEAR OF 30-40 KT SUFFICIENT FOR SOME DEGREE OF ORGANIZATION...
AND RADAR TRENDS INDICATE THAT THE EASTERN-MOST CELL APPROACHING THE
CHAMPAIGN/PAXTON AREA MAY BE BECOMING A LITTLE MORE LINEARLY
ORGANIZED...AND MAY DEVELOP MORE OF A WIND THREAT ACROSS OUR FAR
SOUTHEAST CWA BOUNDARY...WHERE MID ALTITUDE RADIAL CONVERGENCE HAS
STRENGTHENED THE PAST 15-30 MINS.

ADDITIONAL CONVECTIVE DEVELOPMENT IS ALSO POSSIBLE FARTHER NORTH...
WHERE AFOREMENTIONED SYNOPTIC/OUTFLOW BOUNDARY HAS LIFTED TO NEAR A
FEP-RFD-ORD LINE WITH AN INTERSECTION OF THE LAKE BREEZE BETWEEN
ORD/PWK. HOWEVER...LOW LEVEL CONVERGENCE ALONG THE BOUNDARY APPEARS
TO BE WEAKER THAN IT DOES FARTHER SOUTH IN MORE DEEPLY MIXED
BOUNDARY LAYER AND RECENT AMDAR ASCENT SOUNDINGS OUT OF ORD INDICATE
SOME WEAK CAPPING BETWEEN 800-850 MB. MID-LEVEL LAPSE RATES 7-7.5
C/KM AND MUCAPE AROUND 3500 J/KG ABOVE WEAK CAP SUGGEST STRONG
CONVECTION POSSIBLE...PARTICULARLY IN THE NEXT 1-3 HOURS AHEAD/WITH
PASSAGE OF AFOREMENTIONED MCV.

 

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Indeed, CMI is doing well. Hail and a gust to 50 MPH.

 

SPECI KCMI 252317Z 31031G43KT 1/2SM R32R/1400VP6000FT +GRRA FG SCT010 BKN020 OVC036 20/19 A2993 RMK AO2 PK WND 31043/2314 WSHFT 2303 TWR VIS 3/4 TSE15RAB09GRB17 P0044

 

SPECI KCMI 252327Z 32015G42KT 1/2SM R32R/1400V3000FT +GRRA BR BKN014 BKN022 OVC036 20/19 A2994 RMK AO2 PK WND 31043/2314 WSHFT 2303 SFC VIS 3/4 TSE15RAB09GRB17 P0091

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Quite a bit of damage in my hometown of Munster, Indiana from the storms yesterday evening. Row of 8-10 power poles were blown over just down the street from my mom. Trees/limbs knocked down in a relatively narrow path in the central/northern stretch of town. Whatever it was had to be producing winds upwards of 80 mph in that narrow zone. Hope to get some pics to post later.

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I guess there might be a chance for SEMI as there are numerous storms going up behind the initial ones in SWMI. We'll see if they move east or southeast.

 

Those are probably elevated, given that they're right under the cold pool/outflow bubble of those storms in the first row of counties.

 

20130625_2325_DTW_wv.jpg

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What's everyone's thoughts on this evenings/tonight's development back out in Western Iowa? Seems like hi-res models have consistently been showing another major mcs blowing up and charging east/southeast overnight.

 

Agitated cu along I-80 between Des Moines and Omaha.  Looks like something could pop there any time.  Whatever develops there should organize into a large complex and impact the northern half of Illinois later tonight.

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Was driving southeast of Cleveland when the squall line blew through around 4:30...saw winds in excess of 60MPH (probably pushing 70MPH) and saw decent sized tree limbs blowing across the road and even had a large tree fall right next to the road...was impressive.

The complex over MI appears to be organizing a bit. If it can develop a cold pool it should turn more ENE towards Toledo and eventually maybe south of Cleveland as it follows the instability gradient. A 40 knot 500mb flow and over 2000 J/KG of MLCAPE should support upscale growth with that complex this evening. At least I can hope.

post-525-0-45369800-1372203718_thumb.png

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Those are probably elevated, given that they're right under the cold pool/outflow bubble of those storms in the first row of counties.

 

20130625_2325_DTW_wv.jpg

Elevated is fine, storms are storms in my book and you can get severe hail out of elevated storms, just a limit to wind/tornado potential.

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Agitated cu along I-80 between Des Moines and Omaha.  Looks like something could pop there any time.  Whatever develops there should organize into a large complex and impact the northern half of Illinois later tonight.

 

Yea I noticed that. Should be anytime now. Also, the LLJ should be able to get it going as well as that disturbance coming in from KS.

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