Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 12, NWS Chicago, IL

May 3, 2012Cook County, Will County, Illinois; Lake County, Indiana

NWS Chicago, IL issued this severe thunderstorm warning at May 3, 2012, 9:50 PM CDT for Cook County, Will County, Illinois; Lake County, Indiana. It was in force for 55 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 3, 2012, 9:50 PM CDT (02:50 UTC)
Expired: May 3, 2012, 10:45 PM CDT
In force: 55 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cook County, IL, Will County, IL, Lake County, IN

The radar

The Chicago radar (KLOT), 52 km from the middle of the area, began a volume at 02:51 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
May 3, 9:54 PM CDT	HAIL 0.88	Oak Lawn, IL	HIGH STANDING WATER 4 INCHES DEEP IN THE STREET
May 3, 9:55 PM CDT	HAIL 1	Oak Lawn, IL	STANDING WATER IN BACK YARD
May 3, 9:59 PM CDT	HAIL 1	Oak Lawn, IL	FEW LARGER HAIL STONES. HAIL LASTED 3 MINUTES.
May 3, 10:50 PM CDT	HAIL 0.88	2 S Worth, IL

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 5 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 3, 6:41 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.8 hours before the alert went out and 194 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1905 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1071 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

320 
WUUS53 KLOT 040250
SVRLOT
ILC031-197-INC089-040345-
/O.NEW.KLOT.SV.W.0012.120504T0250Z-120504T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
950 PM CDT THU MAY 3 2012

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN COOK COUNTY IN NORTHEAST ILLINOIS...
  EXTREME NORTHERN WILL COUNTY IN NORTHEAST ILLINOIS...
  NORTHERN LAKE COUNTY IN NORTHWEST INDIANA...

* UNTIL 1045 PM CDT

* AT 946 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM CHATHAM TO MOKENA AND MOVING
  EAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  POSEN AND DIXMOOR AROUND 955 PM CDT.
  MARKHAM AND COUNTRY CLUB HILLS AROUND 1000 PM CDT.
  PHOENIX...HAZEL CREST AND HARVEY AROUND 1005 PM CDT.
  HOMEWOOD...FLOSSMOOR AND DOLTON AROUND 1010 PM CDT.
  THORNTON AND SOUTH HOLLAND AROUND 1015 PM CDT.
  GLENWOOD...CALUMET CITY AND BURNHAM AROUND 1020 PM CDT.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME
OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4150 8730 4154 8802 4184 8764 4184 8760
      4177 8756 4175 8752 4170 8751 4168 8745
      4169 8743 4168 8741 4165 8742 4163 8733
      4162 8722 4159 8722
TIME...MOT...LOC 0250Z 262DEG 18KT 4176 8759 4153 8781
WIND...HAIL 60MPH 1.00IN

$$

IZZI

3 follow-up statements

877 
WWUS53 KLOT 040305
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1005 PM CDT THU MAY 3 2012

ILC031-197-INC089-040345-
/O.CON.KLOT.SV.W.0012.000000T0000Z-120504T0345Z/
WILL IL-COOK IL-LAKE IN-
1005 PM CDT THU MAY 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
LAKE...SOUTHERN COOK AND EXTREME NORTHERN WILL COUNTIES UNTIL 1045 
PM CDT...

AT 1000 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM HYDE PARK TO COUNTRY CLUB
HILLS MOVING EAST AT 20 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  PHOENIX...HAZEL CREST...HARVEY AND FLOSSMOOR AROUND 1010 PM CDT.
  HOMEWOOD AND DOLTON AROUND 1015 PM CDT.
  THORNTON...SOUTH HOLLAND AND GLENWOOD AROUND 1020 PM CDT.
  CALUMET CITY...BURNHAM AND WHITING AROUND 1025 PM CDT.
  LYNWOOD AND LANSING AROUND 1030 PM CDT.
  MUNSTER AROUND 1035 PM CDT.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST
FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4150 8730 4154 8802 4184 8764 4184 8760
      4177 8756 4175 8752 4170 8751 4168 8745
      4169 8743 4168 8741 4165 8742 4163 8733
      4162 8722 4159 8722
TIME...MOT...LOC 0305Z 262DEG 18KT 4177 8754 4156 8772
WIND...HAIL 60MPH 1.00IN

$$

IZZI

689 
WWUS53 KLOT 040322
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1022 PM CDT THU MAY 3 2012

ILC197-040331-
/O.CAN.KLOT.SV.W.0012.000000T0000Z-120504T0345Z/
WILL IL-
1022 PM CDT THU MAY 3 2012


...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL WILL COUNTY IS
CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE 
WARNED AREA.

LAT...LON 4150 8730 4153 8779 4156 8780 4156 8789
      4164 8790 4184 8765 4184 8760 4177 8756
      4175 8752 4169 8749 4168 8745 4168 8742
      4165 8742 4162 8722 4160 8722 4159 8722
TIME...MOT...LOC 0321Z 262DEG 18KT 4168 8748 4166 8784

$$

ILC031-INC089-040345-
/O.CON.KLOT.SV.W.0012.000000T0000Z-120504T0345Z/
COOK IL-LAKE IN-
1022 PM CDT THU MAY 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN LAKE
AND SOUTHERN COOK COUNTIES UNTIL 1045 PM CDT...

AT 1019 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM WHITING TO ORLAND PARK...MOVING
EAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  EAST CHICAGO...GRIFFITH...WORTH...OAK LAWN...ALSIP...GARY...
  CHATHAM...LAKE STATION...CHICAGO RIDGE...MERRIONETTE PARK...
  EVERGREEN PARK...ENGLEWOOD...HYDE PARK...BRIDGEPORT...NEW
  CHICAGO...PALOS HEIGHTS...HOMETOWN AND SOUTH CHICAGO.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME
OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4150 8730 4153 8779 4156 8780 4156 8789
      4164 8790 4184 8765 4184 8760 4177 8756
      4175 8752 4169 8749 4168 8745 4168 8742
      4165 8742 4162 8722 4160 8722 4159 8722
TIME...MOT...LOC 0321Z 262DEG 18KT 4168 8748 4166 8784
WIND...HAIL 60MPH 1.00IN

$$

IZZI

593 
WWUS53 KLOT 040346
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1046 PM CDT THU MAY 3 2012

ILC031-INC089-040356-
/O.EXP.KLOT.SV.W.0012.000000T0000Z-120504T0345Z/
COOK IL-LAKE IN-
1046 PM CDT THU MAY 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN LAKE AND SOUTHERN
COOK COUNTIES HAS EXPIRED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...HOWEVER SOME SMALL HAIL AND HEAVY RAIN ARE STILL 
POSSIBLE WITH THESE THUNDERSTORMS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT. 

LAT...LON 4150 8730 4153 8779 4156 8780 4156 8789
      4164 8790 4184 8765 4184 8760 4177 8756
      4175 8752 4169 8749 4168 8745 4168 8742
      4165 8742 4162 8722 4160 8722 4159 8722
TIME...MOT...LOC 0322Z 262DEG 18KT 4168 8747 4166 8783

$$

IZZI

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at May 3, 8:24 PM CDT, 1 hour 26 minutes earlier.

Area forecast discussion, May 3, 8:24 PM CDT, 1 hour 26 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
824 PM CDT THU MAY 3 2012

.MESOSCALE DISCUSSION...
815 PM CDT
MAIN CONCERN FOR THE REST OF THE NIGHT IS FLASH FLOOD POTENTIAL.
TRAINING STORMS OVER NORTHEAST DUPAGE AND NORTHERN COOK COUNTY
CONTINUE TO REGENERATE. SOME ALSO PRODUCING SEVERE HAIL. OTHER
SLOW MOVING HEAVY RAIN PRODUCERS OVER BUREAU-LASALLE
COUNTIES...AND YET ANOTHER CLUSTER OF STORMS MOVING IN FROM
EASTERN IA.

SPC ANALYSIS INDICATES RIBBON OF PRECIPITABLE WATER IN EXCESS OF
1.5 FROM WEST CENTRAL TO NORTHEAST ILLINOIS. THIS IS ALSO AN AREA
OF HIGH 850 MOISTURE TRANSPORT. HRRR INDICATING HEAVIEST RAIN IN
THIS CORRIDOR AS WELL. WILL BE ISSUING A FLASH FLOOD WATCH FOR
OVERNIGHT FOR ALL BUT THE NORTH TIER OF COUNTIES.

ALLSOPP

&&

.DISCUSSION...
315 PM CDT

TONIGHT...
SHOWER AND THUNDERSTORM ACTIVITY IS EXPECTED TO BE ONGOING
OVERNIGHT AND IT IS DIFFICULT TO ADD ANY SPECIFICS THIS AFTERNOON
AS TO WHEN THE HEAVIEST OF ACTIVITY WILL POP AND MOVE ACROSS...AS
GUIDANCE HAS BEEN STRUGGLING TO LATCH ONTO A SOLID SOLUTION. THE
HRRR AND RAP HAVE BEEN PRETTY CONSISTENT FROM RUN TO RUN IN
DEVELOPING CONVECTION ACROSS THE NORTHERN BORDER THIS AFTERNOON
AND EVENING...BUT AS THE MODELS HAVE BEEN UNDER PERFORMING THE LAST
FEW DAYS...NOT GOING TO COMPLETELY BITE OFF ON ANY ONE SOLUTION
HAPPENING THIS EVENING...LEADING TO A LOW CONFIDENCE OVERNIGHT
FORECAST. DO BELIEVE THAT THE ONGOING ACTIVITY FROM MKE TO ROUGHLY
MSN WILL TRY TO WORK SOUTH WHILE MOVING EAST...BUT WILL DEFER TO
SPECIFICS THAT FALL WITHIN THE MESO AFD ABOVE. FRONT WILL SLOWLY
BE SAGGING SOUTH ACROSS SOUTHERN WISCONSIN AND WORK INTO ILLINOIS
THROUGH THE OVERNIGHT HOURS. ACTIVITY WILL THEN BE ON THE WANE
AS WE GET CLOSER TO THE MORNING.

THE STRONG WARM AIR ADVECTION THAT SHOT TEMPERATURES INTO THE 80S
TODAY WILL SHIFT SOUTH. WITH THE FRONT DROPPING THROUGH AND ACROSS
CHICAGO...WINDS WILL FLIP AROUND TO THE NORTHEAST AND PULL A
COOLER MARINE AIRMASS ACROSS MUCH OF THE COASTLINE. MODELS CONTINUE
TO SLOW THIS TREND SLIGHTLY OVER PREVIOUS RUNS...BUT DOES CONTINUE TO
KEEP IT DRAPED ACROSS THE AREA. FORECAST SOUNDINGS AND RAW
NUMERICAL GUIDANCE HIGHLIGHTS GOOD INSTABILITY TO PERSIST SOUTH AND
WEST OF THIS FEATURE...THOUGH THE BEST INSTABILITY WILL BE WEST
ACROSS IOWA...AND OVERALL EFFECTIVE SHEAR WILL IS SUGGESTED TO BE AT
OR BELOW 30 KT INTO THE PEAK OF THE AFTERNOON. SPC HAS MOST OF THE
CWA IN A SLIGHT RISK FOR SEVERE STORMS TOMORROW...BUT IT DOES FOLLOW
THE OVERALL LOCATION OF THE FRONT...FAVORING AREAS WITH THE BEST
INSTABILITY. WITH NO REAL FORCING WIGGLING THROUGH THE FLOW
TOMORROW...THE OVERALL THREAT DOES NOT APPEAR TO BE HIGH...BUT
CANNOT RULE OUT THE POSSIBILITY OF SOME UNORGANIZED CELLS DEVELOPING
WITH MARGINAL SEVERE HAIL AND WIND GUSTS.

DID MAKE BIGGER CHANGES TO THE DAYTIME HIGHS ACROSS LAKE AND COOK
COUNTIES. WITH THE FRONT SAGGING SOUTH OF MOST THE METRO INTO THE
EARLY AFTERNOON...SHOULD SEE TEMPS HIT THEIR PEAK IN THE EARLY
AFTERNOON AND THEN FALL. STILL SOME CONSIDERABLE DIFFERENCES BETWEEN
THE MAV AND THE MET THIS AFTERNOON...WITH A 10+ DEGREE DIFFERENCE
BETWEEN THE TWO. THE THOUGHT IS THAT WITH THE FRONT TO THE
SOUTH...MOST COASTAL AREAS /INCLUDING THE CHICAGO METRO/ WILL SEE
HIGHS PEAKING IN THE UPPER 60S TO AROUND 70 BEFORE FALLING INTO THE
AFTERNOON...THOUGH IF MORE RAIN FALLS OVERNIGHT AND KEEPS CLOUDS
IN...MID 60S COULD BE PUSHING IT.

BY THE WEEKEND...UPPER LEVEL RIDGING ACROSS THE FOUR CORNERS REGION
WILL BEGIN TO SHIFT EAST AND OVERHEAD...BUT CONTINUED DISPARITY
BETWEEN LONG RANGE GUIDANCE IS LEADING TO FURTHER LOW END CONFIDENCE
ON PRECIP CHANCES INTO THE NEXT WEEK. TRENDS ARE INDICATING A
WEAK SHORTWAVE ROLLING ACROSS THE RIDGE LATE SUNDAY AND INTO
MONDAY WILL BRING THE NEXT BEST CHANCE FOR SHOWERS. AS THE RIDGE
SLIDES EAST AND A TROUGH MOVES THROUGH...WILL GENERALLY FALL BACK
INTO A COOLER NORTHWESTERLY FLOW REGIME KEEPING DAYTIME HIGHS
CLOSE TO SEASONAL WITH OFF AND ON CHANCES THROUGH THE WEEK.

SHEA

&&

.AVIATION...

//ORD AND MDW CONCERNS...UPDATED 00Z...

* POTENTIAL FOR ADDITIONAL ROUNDS OF CONVECTION THIS
  EVENING/OVERNIGHT.

* NORTHEASTERLY WINDS AND LOW MVFR OR IFR CIGS DEVELOPING EARLY
  FRIDAY MORNING.

KJB

//DISCUSSION...UPDATED 00Z...

THE MAIN CONCERNS DURING THE PERIOD WILL THE POTENTIAL FOR SEVERAL
ROUNDS OF CONVECTION THROUGH THIS EVENING/OVERNIGHT AND A GOOD
POTENTIAL TO SEE SOME LOW MVFR AND IFR CIGS ON FRIDAY.

A BROKEN LINE OF CONVECTION HAS DEVELOPED ACROSS NORTHERN ILLINOIS
WITH SOME TRAINING OF CELLS NOTED. A STRONG STORM JUST MOVED ACROSS
KORD...WITH ADDITIONAL CELLS DEVELOPING TO THE WEST ACROSS DUPAGE
COUNTY. THESE STORMS LOOK TO MOVE ACROSS KORD THOUGH THE NEXT HOUR
OR TWO. ADDITIONAL STORMS ARE EXPECTED LATER THIS EVENING INTO THE
OVERNIGHT HOURS AS ADDITIONAL CONVECTION CURRENTLY FIRING UP
ACROSS NORTHERN MO AND FAR SOUTHERN IOWA IS EXPECTED TO MOVE
EASTWARD ACROSS ILLINOIS. THE ENVIRONMENT LOOKS TO SUPPORT
TRAINING CELLS TONIGHT...WHICH COULD LEAD TO SEVERAL HOURS OF THUNDER IN
SOME AREAS. THE BIG QUESTION MARK IS WHERE THESE TRAINING CELLS
WILL SET UP. THERE ARE SOME INDICATIONS THAT THE MAIN AREA OF
CONVECTION COULD SHIFT JUST TO THE SOUTH OF THE TERMINALS THIS
EVENING ALONG AN AREA OF GOOD MOISTURE CONVERGENCE AHEAD OF AN
APPROACHING MID LEVEL SHORT WAVE DISTURBANCE. IF THIS DOES OCCUR
THE TERMINALS WILL MISS OUT ON MOST OF THE ACTIVITY.

THE WINDS WILL TURN NORTHEASTERLY OFF OF LAKE MICHIGAN EARLY ON
FRIDAY MORNING. IT APPEARS THAT LOW CLOUDS WILL ALSO MOVE ACROSS THE
AREA...WITH IFR CIGS POSSIBLE FOR MUCH OF DAY.

KJB

//ORD AND MDW CONFIDENCE...UPDATED 00Z...

* LOW CONFIDENCE ON THUNDERSTORMS TRENDS LATER THIS EVENING/OVERNIGHT.
* MEDIUM TO HIGH CONFIDENCE ON WIND TRENDS.
* MEDIUM TO HIGH CONFIDENCE IN LOW MVFR/IFR CIGS ON FRIDAY.

KJB

//OUTLOOK FOR ORD/MDW FOR 12Z SATURDAY-12Z THURSDAY...UPDATED 00Z...

SATURDAY THROUGH TUESDAY...GENERALLY PREVAILING VFR BUT WITH
PERIODIC CHANCES FOR SHRA/TSRA. BEST CHANCES FOR TSRA APPEAR TO BE
FRIDAY INTO THE WEEKEND.

WEDNESDAY...CHANCE SHRA. OTRW...VFR.

KJB

&&

.MARINE...
223 PM CDT

BROAD LOW PRESSURE WILL EVOLVE EAST ACROSS THE CENTRAL PORTION OF
LAKE MICHIGAN TONIGHT. IN ASSOCIATION WITH THIS FEATURE...CLUSTERS
OF THUNDERSTORMS WILL TRAVERSE ACROSS THE SOUTHERN TWO-THIRDS OF THE
LAKE...SOME OF THESE POTENTIALLY PRODUCING GUSTY WINDS IN EXCESS OF
35 KTS. GUSTY SOUTHWEST WINDS WILL CONTINUE INTO EARLY THIS EVENING
FROM CHICAGO EASTWARD ACROSS NEARSHORE AREAS...POTENTIALLY
CONTINUING INTO SMALL CRAFT ADVISORY CRITERIA THROUGH 8 OR 9 PM.
THE LOW WILL STEER A COLD FRONT SLOWLY SOUTHWARD ACROSS THE LAKE
TONIGHT INTO FRIDAY MORNING. THIS WILL REACH THE SOUTHERN PORTION OF
THE LAKE BY MIDDAY FRIDAY.  NORTHEAST WINDS WILL TURN EAST THIS
WEEKEND AS LOW PRESSURE EVOLVES EASTWARD FROM THE CENTRAL
PLAINS...REACHING THE SOUTHERN GREAT LAKES TO MIDDLE OHIO VALLEY BY
SOMETIME EARLY NEXT WEEK.

MTF

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...SMALL CRAFT ADVISORY...INDIANA NEARSHORE WATERS UNTIL 10 PM THURSDAY.

&&

Hazardous weather outlook, May 3, 4:50 PM CDT, 5 hours before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
450 PM CDT THU MAY 3 2012

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
042200-
WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE-
DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-
IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON-
450 PM CDT THU MAY 3 2012 /550 PM EDT THU MAY 3 2012/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE...TONIGHT.

  WEATHER HAZARDS EXPECTED:

  THUNDERSTORMS...SOME MAY PRODUCE:
   HAIL TO THE SIZE OF QUARTERS
   WIND GUSTS IN EXCESS OF 60 MPH
   HEAVY RAINFALL...WITH LOCALIZED FLOODING
   ISOLATED TORNADOES
   CLOUD TO GROUND LIGHTNING.

  AREAS AFFECTED AND TIMING:

  THUNDERSTORMS ARE POSSIBLE THIS EVENING...WITH A THREAT OF
  DAMAGING WIND AND HAIL. SOME OF THESE STORMS MAY BE SEVERE
  AND THE THREAT FOR AN ISOLATED TORNADO SOUTH AND WEST OF A
  MENDOTA TO MORRIS TO PAXTON LINE CANNOT BE RULED OUT. THESE
  STORMS MAY LINGER INTO THE OVERNIGHT HOURS.

  DISCUSSION:

THUNDERSTORM DEVELOPMENT IS POSSIBLE ACROSS NORTH CENTRAL AND
NORTHEASTERN ILLINOIS THIS EVENING AS WARM AND HUMID AIR
INTERACTS WITH SURFACE FEATURES FROM STORMS AND A FRONT
MOVING SOUTH ACROSS WISCONSIN. CHANCES FOR THUNDERSTORM ACTIVITY
ARE LIKELY TO INCREASE INTO THE EVENING HOURS AS THIS BOUNDARY
SLOWLY SAGS SOUTH. FARTHER SOUTH AND WEST...INTO WEST CENTRAL
ILLINOIS IS THE THREAT FOR TORNADOES AS HIGH INSTABILITY AND
BACKING WIND FIELDS SUPPORT THE POTENTIAL FOR ROTATING UPDRAFTS.
IN ADDITION TO THESE THREATS OVERNIGHT ARE THE POTENTIAL FOR
ISOLATED HEAVY RAINFALL AMOUNTS THAT COULD LEAVE TO POSSIBLE FLASH
FLOODING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

POTENTIAL WILL EXIST FOR SEVERE THUNDERSTORMS FRIDAY...WITH THE
PRIMARY THREATS BEING LARGE HAIL AND DAMAGING WIND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TONIGHT.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

LMZ740>745-042200-
WINTHROP HARBOR TO WILMETTE HARBOR-
WILMETTE HARBOR TO NORTHERLY ISLAND-
NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY-
GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY-
450 PM CDT THU MAY 3 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE
WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE
MICHIGAN.

.DAY ONE...TONIGHT.

STRONG WINDS WILL LEAD TO HAZARDOUS CONDITIONS FOR SMALL CRAFT
FOR BOTH THE ILLINOIS AND INDIANA NEARSHORE WATERS THROUGH THIS
EVENING.

POTENTIAL EXISTS FOR THUNDERSTORMS TONIGHT...WITH THE PRIMARY
THREATS BEING LARGE HAIL AND GUSTS OVER 50 KT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS THROUGH
MONDAY...WITH SOME OF THE THUNDERSTORMS ON THURSDAY POSSIBLY
BECOMING SEVERE AND PRODUCING LARGE HAIL AND WIND GUSTS OVER 50
KNOTS.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-042200-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE
MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH
FOX ISLAND 5 NM OFFSHORE-
LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI-
LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE
TO MID LAKE-
LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO
MID LAKE-
450 PM CDT THU MAY 3 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.

.DAY ONE...TONIGHT.

THUNDERSTORMS ARE LIKELY TODAY ACROSS THE NORTH HALF OF LAKE
MICHIGAN AND POTENTIAL EXISTS FOR THUNDERSTORMS AGAIN TONIGHT...WITH THE
PRIMARY THREATS BEING LARGE HAIL AND GUSTS OVER 50 KT.

AREAS OF FOG ARE LIKELY ACROSS CENTRAL AND NORTHERN LAKE MICHIGAN
TODAY...WITH SOME PATCHY AREAS OF DENSE FOG REDUCING VISIBILITIES
BELOW ONE MILE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS THROUGH TUESDAY.
SOME OF THE THUNDERSTORMS ON THURSDAY MAY BE SEVERE WITH LARGE
HAIL AND WIND GUSTS OVER 50 KNOTS.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

SHEA

In the hours before

Local storm report, May 3, 9:25 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
925 PM CDT THU MAY 03 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0918 PM     HAIL             CREST HILL              41.57N 88.11W
05/03/2012  E0.25 INCH       WILL               IL   TRAINED SPOTTER

&&

ED F

Local storm report, May 3, 9:27 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
927 PM CDT THU MAY 03 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0848 PM     HAIL             CHICAGO                 41.88N 87.63W
05/03/2012  E0.88 INCH       COOK               IL   TRAINED SPOTTER

            RAVENSWOOD MANOR

&&

ED F

Special weather statement, May 3, 9:29 PM CDT, 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
929 PM CDT THU MAY 3 2012

ILZ014-022-INZ001-040300-
COOK IL-LAKE IN-WILL IL-
929 PM CDT THU MAY 3 2012

...SPECIAL WEATHER STATEMENT...

AT 925 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM BURBANK TO NEW LENOX...
MOVING EAST AT 20 MPH.

UP TO PENNY SIZE HAIL ARE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
  WORTH...              CHICAGO RIDGE...      BURBANK...
  NEW LENOX...          PALOS HILLS...        MIDWAY AIRPORT...
  HICKORY HILLS...      BEDFORD PARK...       HOMER GLEN...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED.

LAT...LON 4151 8763 4138 8816 4175 8789 4183 8759
      4178 8756 4177 8756 4175 8753 4171 8752
      4169 8749
TIME...MOT...LOC 0229Z 252DEG 19KT 4174 8774 4148 8798

IZZI

Local storm report, May 3, 9:37 PM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
937 PM CDT THU MAY 03 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0858 PM     HAIL             5 E HARWOOD HEIGHTS     41.98N 87.71W
05/03/2012  M1.00 INCH       COOK               IL   AMATEUR RADIO

            HAIL FELL IN ALBANY PARK.

&&

CM

Local storm report, May 3, 9:42 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
942 PM CDT THU MAY 03 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0918 PM     HAIL             CREST HILL              41.57N 88.11W
05/03/2012  E0.25 INCH       WILL               IL   TRAINED SPOTTER

0914 PM     HAIL             LEMONT                  41.67N 87.99W
05/03/2012  E0.25 INCH       COOK               IL   TRAINED SPOTTER

            127TH AND HILLVIEW

0905 PM     HAIL             CHICAGO                 41.88N 87.63W
05/03/2012  E0.75 INCH       COOK               IL   TRAINED SPOTTER

            WRIGLEYVILLE

0859 PM     HAIL             NILES                   42.03N 87.81W
05/03/2012  M1.00 INCH       COOK               IL   TRAINED SPOTTER

            HAIL FELL BETWEEN 800 PM - 820 PM.

0858 PM     HAIL             5 E HARWOOD HEIGHTS     41.98N 87.71W
05/03/2012  M1.00 INCH       COOK               IL   AMATEUR RADIO

            HAIL FELL IN ALBANY PARK.

0855 PM     HAIL             CHICAGO                 41.88N 87.63W
05/03/2012  E1.00 INCH       COOK               IL   TRAINED SPOTTER

            5200-6000 N CALIFORNIA AVE

0855 PM     HAIL             4 ESE HARWOOD HEIGHTS   41.95N 87.74W
05/03/2012  E1.75 INCH       COOK               IL   PUBLIC

            IN THE CITY OF CHICAGO. INTERSECTION OF MILWAUKEE AND
            ADDISON.

0848 PM     HAIL             CHICAGO                 41.88N 87.63W
05/03/2012  E0.88 INCH       COOK               IL   TRAINED SPOTTER

            RAVENSWOOD MANOR

0846 PM     HAIL             6 E FRANKLIN PARK       41.95N 87.77W
05/03/2012  E1.00 INCH       COOK               IL   BROADCAST MEDIA

            IN CITY OF CHICAGO - PORTAGE PARK - CENTRAL AT ADDISON

0845 PM     HAIL             3 ESE HARWOOD HEIGHTS   41.95N 87.75W
05/03/2012  E1.00 INCH       COOK               IL   TRAINED SPOTTER

            IN CITY OF CHICAGO - IRVING PARK RD, CICERO AVE, AND
            MILWAUKEE AVE

0839 PM     HAIL             CHICAGO                 41.88N 87.63W
05/03/2012  E0.50 INCH       COOK               IL   TRAINED SPOTTER

            I-90 AND HARLEM AVE - UP TO 5/8 INCH DIAMETER HAIL

0838 PM     HAIL             3 E HARWOOD HEIGHTS     41.97N 87.75W
05/03/2012  M1.50 INCH       COOK               IL   TRAINED SPOTTER

0837 PM     HEAVY RAIN       EVANSTON                42.05N 87.69W
05/03/2012  E0.00 INCH       COOK               IL   TRAINED SPOTTER

            HIGH STANDING WATER 6 INCHES DEEP IN PARKING LOT. WATER
            BUBBLING UP OUT OF SEWERS

0830 PM     FLASH FLOOD      2 S EVANSTON            42.02N 87.69W
05/03/2012                   COOK               IL   BROADCAST MEDIA

            HOWARD AND WESTERN FLOODED CLOSED.

0830 PM     HAIL             EVANSTON                42.05N 87.69W
05/03/2012  E0.50 INCH       COOK               IL   TRAINED SPOTTER

            VERY HEAVY RAIN, 2 INCHES STANDING WATER IN PARKING LOT
            CHICAGO AVE AND MAIN. WIND GUSTS 45-50 MPH.

0829 PM     HAIL             EVANSTON                42.05N 87.69W
05/03/2012  E0.50 INCH       COOK               IL   TRAINED SPOTTER

0828 PM     HAIL             SCHILLER PARK           41.96N 87.87W
05/03/2012  E0.25 INCH       COOK               IL   TRAINED SPOTTER

            RIVER RD

0820 PM     FLASH FLOOD      4 E DES PLAINES         42.04N 87.82W
05/03/2012                   COOK               IL   BROADCAST MEDIA

            DEMPSTER FLOODED BETWEEN OZARK AND WAUKEGAN ROAD

0820 PM     FLOOD            HARWOOD HEIGHTS         41.97N 87.81W
05/03/2012                   COOK               IL   LAW ENFORCEMENT

            7300 NATCHEZ BLOCKED DUE TO HIGH STANDING WATER

0805 PM     HAIL             MORTON GROVE            42.04N 87.79W
05/03/2012  M0.75 INCH       COOK               IL   TRAINED SPOTTER

            DIME TO PENNY SIZED HAIL. INTERSECTION OF GOLF AND
            SHERMER.

0750 PM     NON-TSTM WND GST MOUNT PROSPECT          42.07N 87.94W
05/03/2012  E50.00 MPH       COOK               IL   TRAINED SPOTTER

            WINDS ESTIMATED 40-50 MPH. NO DAMAGE.

0750 PM     HAIL             DES PLAINES             42.03N 87.90W
05/03/2012  E0.25 INCH       COOK               IL   AMATEUR RADIO

            RIVER AND GOLF ROADS

0732 PM     HAIL             EVANSTON                42.05N 87.69W
05/03/2012  E0.25 INCH       COOK               IL   TRAINED SPOTTER

            ALONG THE LAKEFRONT

0731 PM     HAIL             SCHAUMBURG              42.03N 88.08W
05/03/2012  E0.25 INCH       COOK               IL   COCORAHS

            3/8 INCH HAIL

0723 PM     HAIL             CHICAGO                 41.88N 87.63W
05/03/2012  E0.88 INCH       COOK               IL   TRAINED SPOTTER

            WINDS ESTIMATED 50 MPH. SMALL TREE LIMBS DOWN. TOUHY AND
            CALDWELL - FAR NORTHWEST CHICAGO.

0720 PM     HAIL             DES PLAINES             42.03N 87.90W
05/03/2012  E1.00 INCH       COOK               IL   TRAINED SPOTTER

            TOUHY AND RIVER RD

0718 PM     HAIL             NORRIDGE                41.97N 87.82W
05/03/2012  E0.75 INCH       COOK               IL   TRAINED SPOTTER

0713 PM     HAIL             DES PLAINES             42.03N 87.90W
05/03/2012  E0.25 INCH       COOK               IL   TRAINED SPOTTER

0710 PM     HAIL             PARK RIDGE              42.01N 87.84W
05/03/2012  E1.00 INCH       COOK               IL   COCORAHS

            0.69 INCHES RAINFALL

0657 PM     HAIL             CHICAGO                 41.88N 87.63W
05/03/2012  E0.25 INCH       COOK               IL   TRAINED SPOTTER

            ROGERS PARK

0652 PM     HAIL             WEST CHICAGO            41.89N 88.22W
05/03/2012  E0.25 INCH       DUPAGE             IL   TRAINED SPOTTER

0652 PM     HAIL             EVANSTON                42.05N 87.69W
05/03/2012  E1.25 INCH       COOK               IL   TRAINED SPOTTER

0652 PM     HAIL             EVANSTON                42.05N 87.69W
05/03/2012  M1.25 INCH       COOK               IL   TRAINED SPOTTER

0643 PM     HAIL             SKOKIE                  42.04N 87.74W
05/03/2012  E0.25 INCH       COOK               IL   TRAINED SPOTTER

0640 PM     HAIL             CHICAGO                 41.88N 87.63W
05/03/2012  E0.50 INCH       COOK               IL   AMATEUR RADIO

            MILWAUKEE AVE AND BRYN MAWR

0640 PM     HAIL             EVANSTON                42.05N 87.69W
05/03/2012  M0.88 INCH       COOK               IL   TRAINED SPOTTER

0640 PM     HAIL             MORTON GROVE            42.04N 87.79W
05/03/2012  E1.25 INCH       COOK               IL   TRAINED SPOTTER

            HAIL FROM PENNY TO HALF DOLLAR SIZED - GROSS POINT AND
            OAKTON - NEAR NILES WEST H.S.

0637 PM     HAIL             NILES                   42.03N 87.81W
05/03/2012  E1.00 INCH       COOK               IL   TRAINED SPOTTER

0635 PM     HAIL             NILES                   42.03N 87.81W
05/03/2012  M1.25 INCH       COOK               IL   TRAINED SPOTTER

            HAIL RANGING FROM DIME SIZED TO HALF DOLLAR SIZED. HEAVY
            RAIN RESULTING IN STANDING WATER 3 INCHES DEEP IN PARKING
            LOT

0628 PM     HAIL             NILES                   42.03N 87.81W
05/03/2012  E0.50 INCH       COOK               IL   TRAINED SPOTTER

            DIME SIZED HAIL - MILWAUKEE AVE AND TOUHY AVE

0623 PM     HAIL             DES PLAINES             42.03N 87.90W
05/03/2012  E0.25 INCH       COOK               IL   TRAINED SPOTTER

            TOUHY AND RIVER RD

0602 PM     HAIL             PLAINFIELD              41.62N 88.20W
05/03/2012  M0.75 INCH       WILL               IL   NWS EMPLOYEE

            DIME SIZED HAIL MEASURED

&&

SSHEA

Local storm report, May 3, 9:46 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
946 PM CDT THU MAY 03 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0834 PM     HAIL             GRAND RIDGE             41.24N 88.83W
05/03/2012  E0.50 INCH       LA SALLE           IL   TRAINED SPOTTER

            HAIL UP TO DIME SIZED - GRAND RIDGE RD AND 23

&&

ED F

The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 3, 7:08 PM CDT	Severe Thunderstorm Warning	LOT	Cook	67 min
May 3, 7:23 PM CDT	Flash Flood Warning	LOT	Cook, DuPage	4 hr
May 3, 8:00 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	75 min
May 3, 8:07 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle, Livingston	68 min
May 3, 8:12 PM CDT	Special Marine Warning	LOT		2 hr
May 3, 8:43 PM CDT	Flash Flood Watch	LOT	DuPage, Grundy, Kankakee, Kendall, LaSalle, Livingston	7 hr
May 3, 9:19 PM CDT	Special Marine Warning	LOT		116 min
May 3, 9:29 PM CDT	Special Weather Statement	LOT	Will	31 min
May 3, 10:10 PM CDT	Flash Flood Warning	LOT	Cook	5 hr
May 3, 10:47 PM CDT	Special Weather Statement	LOT	Cook	28 min
May 4, 12:34 AM CDT	Severe Thunderstorm Warning	LOT	Grundy, LaSalle, Livingston	71 min
May 4, 12:46 AM CDT	Flash Flood Warning	LOT	LaSalle, Livingston	6 hr
May 4, 1:26 AM CDT	Severe Thunderstorm Warning	LOT	Ford, Grundy, Iroquois, Kankakee, Livingston	63 min
May 4, 3:07 AM CDT	Marine Dense Fog Advisory	LOT		18 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2012 Severe Thunderstorm Warnings in Indiana, 2012 Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.