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August 17th-21st Severe Weather Event


HillsdaleMIWeather

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MD issued from northwest IL and northeast IA to eastern MO and far western IL. 60% watch probs.

http://www.spc.noaa.gov/products/md/md1704.html

Decided to pull the trigger on chasing with Adam Lucio and Danny Neal. We're currently heading stopped for gas off of I-80 near Princeton IL.

 

Those bums

 

Theta-e/instability axis running right up to I-80 west of there currently. Hopefully some better/heating mixing through the afternoon will stregthen the sfc flow a litte more. 

 

Shear there for supercells but given the high dew points/deep moisture/high PWATS and weak upper flow, would expect HP's. 

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Those bums

Theta-e/instability axis running right up to I-80 west of there currently. Hopefully some better/heating mixing through the afternoon will stregthen the sfc flow a litte more.

Shear there for supercells but given the high dew points/deep moisture/high PWATS and weak upper flow, would expect HP's.

We're hoping that deepening of sfc low/pressure falls also increases the surface flow. If the 4km NAM has a clue there should be some nice crossovers in the area we're headed to during the mid-late afternoon.

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GRR:

000

FXUS63 KGRR 181923

AFDGRR

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE GRAND RAPIDS MI

323 PM EDT TUE AUG 18 2015

LATEST UPDATE...

SYNOPSIS/SHORT TERM/LONG TERM/HYDRO/MARINE

.SYNOPSIS...

ISSUED AT 318 PM EDT TUE AUG 18 2015

SOME SEVERE THUNDERSTORMS ARE POSSIBLE WEDNESDAY THOUGH NOT A SURE

THING AT THIS TIME. LOCALLY HEAVY RAINS ARE POSSIBLE WITH ANY

STORMS THAT DEVELOP FROM THIS EVENING THROUGH LATE WEDNESDAY

NIGHT. DRY AND BREEZY CONDITIONS ARE EXPECTED THURSDAY.

&&

.SHORT TERM...(THIS EVENING THROUGH THURSDAY NIGHT)

ISSUED AT 318 PM EDT TUE AUG 18 2015

AN OPPORTUNITY EXISTS FOR SOME SEVERE WEATHER WEDNESDAY...FOLLOWED

BY A DRY AND BREEZY DAY ON THURSDAY. OUR FOCUS CONTINUES TO REMAIN

ON CHANCES FOR SEVERE THUNDERSTORMS WEDNESDAY AFTERNOON IN

PARTICULAR.

NOT ALL SEVERE WEATHER PARAMETERS ARE LINED UP FOR WEDNESDAY...BUT

ENOUGH WILL BE PRESENT THAT THE THREAT REMAINS FOR AT LEAST SOME

SCATTERED SEVERE THUNDERSTORMS ACROSS CENTRAL AND SOUTHERN LOWER MI

DURING THE AFTERNOON AND EVENING WITH DAMAGING WIND GUSTS BEING THE

PRIMARY HAZARD. THE BEST ELEMENT GOING FOR THIS EVENT WILL BE GOOD

DEEP LAYER SHEAR LATER IN THE AFTERNOON...FAVORING THE EASTERN HALF

OF THE FORECAST AREA. VALUES WILL INCREASE TO AROUND 40 KNOTS

BETWEEN 18Z AND 00Z. WITH EQUILIBRIUM LEVELS TO 40K FT AND SFC BASED

CAPE OF AROUND 1000 J/KG POSSIBLE...SOME HAIL IS POSSIBLE AS WELL

THOUGH IT IS A LESSER SEVERE THREAT THAN THE 50+ KT WIND GUSTS THAT

COULD MIX DOWN IN THE MOST MATURE STORMS. 0-1 KM SRH IS NOT OVERLY

IMPRESSIVE WITH THIS EVENT...PERHAPS 50-100 M2/S2 DEPENDING ON WHAT

MODEL YOU ARE REFERENCING AND ALSO THE TIME PERIOD...BUT THERE MAY

BE SOME ROTATION ALOFT TO MONITOR.

THE 12Z ECMWF IS SQUASHING THE SEVERE THREAT FOR THE LAKESHORE

REGION AND INLAND TO US 131 WEDNESDAY WITH LITTLE TO NO INSTABILITY

PRESENT DURING THE DAY...LIKELY DUE TO LINGERING CONVECTION THAT MAY

BE PRESENT IN THE MORNING...WHICH IS PLAUSIBLE GIVEN A DECENT 40 KT

LLJ POINTED TOWARD THE STATE BETWEEN 06Z-12Z WED. IF THIS SCENARIO

HOLDS TRUE...AFTERNOON THUNDERSTORM DEVELOPMENT WOULD BE MORE LIKELY

EAST OF THE GRAND RAPIDS AREA AND TOWARD MOP/LAN/JXN. CRAVEN/BROOKS

SIG SEVERE PROBS FOR >20000 ARE ONLY 10-30% OFF THE SPC SREF FOR OUR

REGION. SO...SEVERE STORMS ARE NOT A GIVEN.

ANY OF THE SHOWERS AND STORMS FROM THIS EVENING THROUGH WEDNESDAY

NIGHT COULD HAVE SOME HEAVY DOWNPOURS IN A VERY MOISTURE-RICH

ENVIRONMENT AND 1000-500 MB RH OF 80% OR BETTER AND SW FLOW ALOFT.

SOME LAKESHORE AREAS COULD PICK UP A ROUND OF MODERATE TO HEAVY

RAINFALL LATE TONIGHT AND EARLY WEDNESDAY MORNING...THOUGH HI RES

MODELS SUCH AS THE EXPERIMENTAL HRRR...NAMDNG...AND HI RES WRF ARE

SHOWING DECAYING CONVECTION OVER THE LAKE BETWEEN 03Z-09Z. IT

REMAINS TO BE SEEN WHETHER WE CAN ERODE ANY CLOUD COVER WEDNESDAY

MORNING TO DESTABILIZE ACROSS THE WESTERN PORTION OF THE CWA AND

KEEP THE LOCALLY HEAVY RAINFALL THREAT GOING.

THE TRAILING COLD FRONT WON`T ARRIVE UNTIL LATE WEDNESDAY

NIGHT/EARLY THURSDAY MORNING. UNTIL THAT HAPPENS THE THREAT FOR

SHOWERS AND A FEW STORMS MAY CONTINUE PAST 00Z THURS. PW VALUES

HOLD UP TO AROUND 1.50-1.75" SO SOME HEAVIER SHOWERS/STORMS MAY

PERSIST.

THURSDAY LOOKS BREEZY WITH SOME DECENT MIXING THAT COULD TAP 30 KT

WINDS OR BETTER. WOULD NOT BE SURPRISED TO SEE SOME GUSTS IN THE

30-40 MPH RANGE JUST ABOUT ANYWHERE ON THURSDAY.

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VERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL

431 PM CDT TUE AUG 18 2015

 

ILC105-182200-

/O.CON.KLOT.TO.W.0033.000000T0000Z-150818T2200Z/

LIVINGSTON IL-

431 PM CDT TUE AUG 18 2015

 

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR

NORTHWESTERN LIVINGSTON COUNTY...

    

AT 430 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 

WAS LOCATED ABOUT 7 MILES NORTHWEST OF PONTIAC...MOVING NORTHEAST AT 

15 MPH.

 

HAZARD...TORNADO. 

 

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. 

 

LOCATIONS IMPACTED INCLUDE...

CORNELL.

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confirmed tornado

 

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
445 PM CDT TUE AUG 18 2015
 
ILC105-182200-
/O.CON.KLOT.TO.W.0033.000000T0000Z-150818T2200Z/
LIVINGSTON IL-
445 PM CDT TUE AUG 18 2015
 
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR
NORTHWESTERN LIVINGSTON COUNTY...
    
AT 444 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 
WAS LOCATED 8 MILES NORTHWEST OF PONTIAC...NEAR CORNELL...MOVING 
NORTHEAST AT 10 MPH. THIS STORM HAS ALREADY PRODUCED A BRIEF 
TORNADO JUST SOUTHEAST OF CORNELL.
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Tornado watch expanded east a few counties, but does not include Cook.

Was at Wrigley a few years ago when Chicago was under a tor warning. Sirens sounded and 30k people were evacuated to the lower concourse but weren't allowed to leave the stadium. Alek and Snowfreak you guys don't want that. What a nightmare.

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