Alert archive / Illinois / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 65, NWS Chicago, IL

July 6, 2003Kankakee County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jul 6, 2003, 3:12 PM CDT for Kankakee County, Illinois. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 6, 2003, 3:12 PM CDT (20:12 UTC)
Expired: Jul 6, 2003, 4:15 PM CDT
In force: 63 min
Issued by: NWS Chicago, IL
Area: Counties, with a storm outline in the text

County Kankakee County, IL

The radar

The Chicago radar (KLOT), 52 km from the middle of the area, began a volume at 20:15 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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
Jul 6, 11:45 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.2 hours before the alert went out and 126 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: 1041 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 1114 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLOT 062012
SVRLOT
ILC091-062115-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHICAGO IL
312 PM CDT SUN JUL 6 2003

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KANKAKEE COUNTY IN NORTHEAST ILLINOIS

* UNTIL 415 PM CDT

* AT 312 PM CDT A SEVERE THUNDERSTORM WAS LOCATED OVER ESSEX...OR
  ABOUT 9 MILES SOUTH OF WILMINGTON...MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  KANKAKEE AROUND 355 PM CDT.
  BRADLEY AROUND 400 PM CDT.
  AROMA PARK AROUND 410 PM CDT.
  MOMENCE AROUND 415 PM CDT.

THIS SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING...
  QUARTER SIZE HAIL.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. SEVERE
THUNDERSTORMS MAY PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

LAT...LON 4102 8763 4109 8826 4122 8825 4122 8803
          4127 8803 4126 8756
$$

ALLSOPP

NNNN

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 Jul 6, 2:00 PM CDT, 1 hour 12 minutes earlier.

Area forecast discussion, Jul 6, 2:00 PM CDT, 1 hour 12 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO IL
200 PM CDT SUN JUL 6 2003

DISCUSSION FOR AFTERNOON GRIDS AND ZONES...

SVR WX IN PROGRESS.  SEE SWODY1 AND HWOLOT FOR DETAILS ON TSTM
DVLPMT NXT 18 HRS.  HAVE CHGD LTL IN GRIDS/ZONES XCP FOR WED-THU.
HAVE INTODUCED MENTION OF PRECIP THIS PERIOD BASED ON 12Z MDL RUNS
BRINGING ANOTHER COUPLE OF SHORT WAVES THRU NWLY H5 FLO DURG THIS
PERIOD.  OTRW LTL CHG TO FCST.

.CHI...NONE

MERZLOCK

Hazardous weather outlook, Jul 6, 11:00 AM CDT, 4 hours 12 minutes before

ILZ003>006-008-010>014-019-020>023-032-033-039-INZ001-002-010-011-019
-071100-

HAZARDOUS WEATHER OUTLOOK/SUPPLEMENTAL
NATIONAL WEATHER SERVICE CHICAGO IL
1100 AM CDT SUN JUL 6 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST
ILLINOIS...NORTHWEST INDIANA...AND THE ADJACENT WATERS OF LAKE
MICHIGAN.

.DAY ONE... THIS AFTERNOON AND TONIGHT

A WATCH BOX WILL BE ISSUED FOR THE ENTIRE AREA AROUND NOON.

FOLLOWING A LULL IN ACTIVITY THIS EVENING...THERE IS A MODERATE RISK
OF SEVERE THUNDERSTORMS AFTER MIDNIGHT IN AREAS NORTH OF ABOUT I
80...AND A SLIGHT RISK OF SEVERE STORMS SOUTH OF I 80.

DAMAGING WINDS WILL BE THE MAIN THREAT THIS AFTERNOON WITH ISOLATED
SUPERCELLS CAPABLE OF PRODUCING LARGE HAIL AND TORNADOES.

THE PRIMARY THREAT TONIGHT WILL BE DAMAGING WINDS AND LARGE HAIL.

A MESOSCALE STORM SYSTEM OVER NORTHEAST IOWA LATE THIS MORNING
WILLBE TRACKING EASTWARD ACROSS SOUTHERN WISCONSIN THIS AFTERNOON.
AS IT DOES SO IT WILL BE MOVING INTO VERY UNSTABLE AIR OVER NORTHERN
ILLINOIS AND NORTHWEST INDIANA.  DUE TO THE DEGREE OF INSTABILITY IN
PLACE...WITH SURFACE TEMPERATURES AROUND 90 AND DEW POINTS IN THE
LOWER AND MIDDLE 70S...SOME SUPERCELLS ARE POSSIBLE.  WIND SHEAR
THROUGH THE MID LEVELS OF THE ATMOSPHERE MAY PROVIDE AN ENVIRONMENT
FAVORABLE FOR ROTATION.

ANOTHER MESOSCALE WEATHER SYSTEM IS EXPECTED TO BLOW UP THIS
AFTERNOON AND EVENING AHEAD OF A COLD FRONT IN MINNESOTA AND TRACK
SOUTHEAST INTO OUR AREA AFTER MIDNIGHT.

.DAYS TWO THROUGH SEVEN... MONDAY THROUGH SATURDAY

TEMPERATURES REACHING THE MID 90S...AND DEWPOINTS INTO THE 70S WILL
COMBINE TO PRODUCE HEAT INDICES APPROACHING 105 IN SOME AREAS.

PERIODS OF THUNDERSTORMS ARE LIKELY INTO WEDNESDAY MORNING.  SOME OF
THESE MAY BE SEVERE WITH ADDITIONAL HEAVY RAIN.  DRIER AND COOLER
AIR IS EXPECTED LATER WEDNESDAY THROUGH FRIDAY. MORE THUNDERSTORMS
ARE POSSIBLE SATURDAY.

SPOTTER ACTIVATION IS LIKELY THIS AFTERNOON AND MAY BE NEEDED AGAIN
LATE TONIGHT...AFTER MIDNIGHT.

&&

           NWS CHICAGO WEBPAGE

    HTTP://WWW.CRH.NOAA.GOV/LOT (LOWER CASE)
OR  HTTP://WEATHER.NOAA.GOV/CHICAGO (LOWER CASE)

MERZLOCK

In the hours before

Local storm report, Jul 6, 1:30 PM CDT, 1 hour 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
130 PM CDT SUN JUL 06 2003

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0107 PM    REDDICK                   IL   1.75 INCH HAIL
07/06/03   KANKAKEE                       REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0107 PM    2 E BONFIELD              IL   .75 INCH HAIL
07/06/03   KANKAKEE                       REPORTED BY HAM RADIO
                                          OPERATOR.

Local storm report, Jul 6, 1:46 PM CDT, 1 hour 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
146 PM CDT SUN JUL 06 2003

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0130 PM    2 W KANKAKEE              IL   .75 INCH HAIL
07/06/03   KANKAKEE                       REPORTED BY PUBLIC.

0143 PM    KANKAKEE                  IL   .75 INCH HAIL
07/06/03   KANKAKEE                       REPORTED BY HAM RADIO
                                          OPERATOR.

0143 PM    BRADLEY                   IL   .75 INCH HAIL
07/06/03   KANKAKEE                       REPORTED BY HAM RADIO
                                          OPERATOR.

Local storm report, Jul 6, 1:56 PM CDT, 1 hour 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
156 PM CDT SUN JUL 06 2003

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1239 PM    3 W KANKAKEE              IL   1 INCH HAIL
07/06/03   KANKAKEE                       HAIL LASTED 2-3
                                          MINUTES. REPORTED BY
                                          LAW ENFORCEMENT OFFICIAL.

Local storm report, Jul 6, 2:05 PM CDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
205 PM CDT SUN JUL 06 2003

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0155 PM    WOODSTOCK                 IL   .75 INCH HAIL
07/06/03   MCHENRY                        REPORTED BY COOPERATIVE
                                          OBSERVER.

Local storm report, Jul 6, 2:07 PM CDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
207 PM CDT SUN JUL 06 2003

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0159 PM    ARLINGTON HGTS            IL   1 INCH HAIL
07/06/03   COOK                           ARLINGTON HGTS &
                                          DUNDEE. REPORTED BY
                                          STORM SPOTTER.

Local storm report, Jul 6, 3:05 PM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
305 PM CDT SUN JUL 06 2003

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0150 PM    BRADLEY                   IL   .75 INCH HAIL
07/06/03   KANKAKEE                       REPORTED BY STORM
                                          SPOTTER.

0155 PM    WOODSTOCK                 IL   .75 INCH HAIL
07/06/03   MCHENRY                        REPORTED BY COOPERATIVE
                                          OBSERVER.

0159 PM    ARLINGTON HGTS            IL   1 INCH HAIL
07/06/03   COOK                           REPORTED BY STORM
                                          SPOTTER.

0204 PM    BUFFALO GROVE             IL   1.75 INCH HAIL
07/06/03   LAKE                           REPORTED BY HAM RADIO
                                          OPERATOR.

0205 PM    WHEELING                  IL   1.75 INCH HAIL
07/06/03   COOK                           DAMAGE TO POLICE CARS
                                          AND OTHER VEHICLES.
                                          WINDSHIELD BLOWN ON A
                                          CITIZEN/S CAR.

0206 PM    WHEELING                  IL   1 INCH HAIL
07/06/03   COOK                           QUARTER SIZE HAIL AT
                                          DUNDEE & MILWUAKEE RDS.
                                          REPORTED BY HAM RADIO
                                          OPERATOR.

0210 PM    WOODSTOCK                 IL   1 INCH HAIL
07/06/03   MCHENRY                        REPORTED BY EMERGENCY
                                          MANAGEMENT.

0223 PM    3 NW MORRIS               IL   .88 INCH HAIL
07/06/03   GRUNDY                         REPORTED BY EMERGENCY
                                          MANAGEMENT.

0233 PM    OTTAWA                    IL   1 INCH HAIL
07/06/03   LASALLE                        REPORTED BY HAM RADIO
                                          OPERATOR.

0233 PM    OTTAWA                    IL   60 MPH TSTM GUST
07/06/03   LASALLE                        REPORTED BY HAM RADIO
                                          OPERATOR.

0233 PM    MAZON                     IL   .75 INCH HAIL
07/06/03   GRUNDY                         REPORTED BY HAM RADIO
                                          OPERATOR.

0238 PM    OTTAWA                    IL   WIND DAMAGE
07/06/03   LASALLE                        N SIDE OF OTTAWA. CORN
                                          CROPS DOWN. LIMBS IN
                                          STREET.

0242 PM    WAUCONDA                  IL   1.75 INCH HAIL
07/06/03   LAKE                           AT INTERSECTION OF
                                          GILMER & FAIRFIELD.
                                          REPORTED BY STORM
                                          SPOTTER.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 1:12 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee	48 min
Jul 6, 1:54 PM CDT	Severe Thunderstorm Warning	LOT	Cook	36 min
Jul 6, 1:58 PM CDT	Severe Thunderstorm Warning	LOT	Lake, McHenry	47 min
Jul 6, 1:59 PM CDT	Special Marine Warning	LOT		91 min
Jul 6, 2:14 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Will	46 min
Jul 6, 2:25 PM CDT	Tornado Warning	LOT	Lake, McHenry	50 min
Jul 6, 2:26 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle	49 min
Jul 6, 3:01 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Will	59 min
Jul 6, 3:08 PM CDT	Special Marine Warning	LOT		52 min
Jul 6, 3:16 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	44 min
Jul 6, 3:18 PM CDT	Tornado Warning	LOT	Lake	27 min
Jul 6, 3:25 PM CDT	Severe Thunderstorm Warning	LOT	McHenry	50 min
Jul 6, 4:07 PM CDT	Special Marine Warning	LOT		53 min
Jul 6, 5:10 PM CDT	Severe Thunderstorm Warning	LOT	DuPage, Kane	35 min
Jul 6, 5:13 PM CDT	Severe Thunderstorm Warning	LOT	DuPage	32 min
Jul 6, 5:27 PM CDT	Severe Thunderstorm Warning	LOT	Cook	48 min
Jul 6, 5:32 PM CDT	Special Marine Warning	LOT		58 min
Jul 6, 5:32 PM CDT	Special Marine Warning	LOT		58 min
Jul 6, 5:40 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	50 min
Jul 6, 6:24 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	51 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2003 Every severe thunderstorm warning in 2003

Sources

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