Alert archive / Illinois / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 15, NWS Chicago, IL

June 4, 2002Livingston County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 4, 2002, 6:07 PM CDT for Livingston County, Illinois. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 4, 2002, 6:07 PM CDT (23:07 UTC)
Expired: Jun 4, 2002, 6:30 PM CDT
In force: 23 min
Issued by: NWS Chicago, IL
Area: Counties, with a storm outline in the text

County Livingston County, IL

The radar

The Chicago radar (KLOT), 89 km from the middle of the area, began a volume at 23:06 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.1 hours before the alert went out and 83 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: 1332 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1268 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.8

Open this sounding in Storm Lab

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 Jun 4, 3:00 PM CDT, 3 hours 7 minutes earlier.

Area forecast discussion, Jun 4, 3:00 PM CDT, 3 hours 7 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO IL
300 PM CDT TUE JUN 4 2002

MAIN WX PROB IS IN NEAR TERM WITH ONGOING THUNDERSTORMS.  QSTNRY
BNDRY ACROSS NRN IL.  WW239 WIBIS SHORTLY FOR PORTIONS OF
NORTHEAST IL AND NWRN IN.  OTHER QUESTION INVOLVES FLOOD
WATCH/WARNING.  AM EXPECTING TO ALLOW THESE TO EXPIRE AS MAIN
FOCUS FOR RENEWED TSTM DVLPMT APPEARS TO HAVE SHIFTED SWD ALONG
OUTFLOW BOUNDARIES FROM EARLIER CONVECTION.  VIS SATLT LOOPS
SHOW MOST INTS CONVECTION DVLPG OVER WCNTRL IL FRM NR BRL-SRN
LASALLE CO.  THIS SHUD ALSO LIMIT ANY ADDL DVLPMT N OF I-80.
THEREFORE WILL GO GENLY WITH MOS POPS WITH CHC CAT N CNTRL IL
AND LIKELY THRU I-80 CORRIDOR...THEN CATEGORICAL TO S.

BY 12Z WED...MAIN AXIS OF THETA-E ADVCN SHIFTS S AND E OF FA SO
WILL HAVE SOME LINGERING SHWRS IN SRN PORTION OF CWA IN MRNG.
DECENT SUBSIDENCE WED-THU SUGGESTS CLRG MAY BE A LTL QUICKER
THAN PREV FCST SO MAY MENTION THIS IN NRN IL CTYS FOR WED AFTN.

HI PRES BUILDS IN THU-FRI AND WX IS EXPECTED TO BE NIL UNTIL
RETURN OF MT AMS ABOUT SAT NIGHT OR SUN BASED ON 12Z AVN.

.CHI...NONE

MERZLOCK

In the hours before

Local storm report, Jun 4, 5:22 PM CDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
522 PM CDT TUE JUN 04 2002

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

0117 PM    YORKVILLE                 IL   WIND DAMAGE
06/04/02   KENDALL                        TREES DOWN ALONG RIVER
                                          ROAD SOUTH OF TOWN.
                                          REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0210 PM    LEMONT                    IL   .88 INCH HAIL
06/04/02   COOK                           ON PLAINFIELD ROAD BY
                                          LEMONT, NORTH OF I-55.
                                          REPORTED BY STORM
                                          SPOTTER.

0254 PM    ANCONA                    IL   TORNADO
06/04/02   LIVINGSTON                     TORNADO ON GROUND WITH
                                          DEBRIS CLOUD., 1 MILE
                                          WEST OF ANCONA.
                                          REPORTED BY HAM RADIO
                                          OPERATOR.

0300 PM    STREATOR                  IL   TORNADO
06/04/02   LASALLE                        FUNNEL CLOUD TOUCHED
                                          DOWN. REPORTED BY STORM
                                          SPOTTER.

0315 PM    KATY DID                  IL   TORNADO
06/04/02   LIVINGSTON                     TOUCH DOWN AT HIGHWAY
                                          170 AND 17
                                          INTERSECTION. REPORTED
                                          BY FIRE AND RESCUE.

ZCZC CHILSRCHI ALL
TTAA00 KCHI DDHHMM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
522 PM CDT TUE JUN 04 2002

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

0117 PM    YORKVILLE                 IL   WIND DAMAGE
06/04/02   KENDALL                        TREES DOWN ALONG RIVER
                                          ROAD SOUTH OF TOWN.
                                          REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0210 PM    LEMONT                    IL   .88 INCH HAIL
06/04/02   COOK                           ON PLAINFIELD ROAD BY
                                          LEMONT, NORTH OF I-55.
                                          REPORTED BY STORM
                                          SPOTTER.

0254 PM    ANCONA                    IL   TORNADO
06/04/02   LIVINGSTON                     TORNADO ON GROUND WITH
                                          DEBRIS CLOUD., 1 MILE
                                          WEST OF ANCONA.
                                          REPORTED BY HAM RADIO
                                          OPERATOR.

0300 PM    STREATOR                  IL   TORNADO
06/04/02   LASALLE                        FUNNEL CLOUD TOUCHED
                                          DOWN. REPORTED BY STORM
                                          SPOTTER.

0315 PM    KATY DID                  IL   TORNADO
06/04/02   LIVINGSTON                     TOUCH DOWN AT HIGHWAY
                                          170 AND 17
                                          INTERSECTION. REPORTED
                                          BY FIRE AND RESCUE.

Local storm report, Jun 4, 5:22 PM CDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
522 PM CDT TUE JUN 04 2002

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

0117 PM    YORKVILLE                 IL   WIND DAMAGE
06/04/02   KENDALL                        TREES DOWN ALONG RIVER
                                          ROAD SOUTH OF TOWN.
                                          REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0210 PM    LEMONT                    IL   .88 INCH HAIL
06/04/02   COOK                           ON PLAINFIELD ROAD BY
                                          LEMONT, NORTH OF I-55.
                                          REPORTED BY STORM
                                          SPOTTER.

0254 PM    ANCONA                    IL   TORNADO
06/04/02   LIVINGSTON                     TORNADO ON GROUND WITH
                                          DEBRIS CLOUD., 1 MILE
                                          WEST OF ANCONA.
                                          REPORTED BY HAM RADIO
                                          OPERATOR.

0300 PM    STREATOR                  IL   TORNADO
06/04/02   LASALLE                        FUNNEL CLOUD TOUCHED
                                          DOWN. REPORTED BY STORM
                                          SPOTTER.

0315 PM    KATY DID                  IL   TORNADO
06/04/02   LIVINGSTON                     TOUCH DOWN AT HIGHWAY
                                          170 AND 17
                                          INTERSECTION. REPORTED
                                          BY FIRE AND RESCUE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 3, 7:46 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kane, Kendall, Lee, Ogle	44 min
Jun 3, 7:59 PM CDT	Special Marine Warning	LOT		2 hr
Jun 3, 7:59 PM CDT	Special Marine Warning	LOT		2 hr
Jun 3, 7:59 PM CDT	Special Marine Warning	LOT		2 hr
Jun 3, 8:25 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Kane, Kendall, Will	50 min
Jun 4, 5:37 AM CDT	Flash Flood Warning	LOT	Ogle	3 hr
Jun 4, 7:03 AM CDT	Flash Flood Warning	LOT	Lee	3 hr
Jun 4, 1:01 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kane, Kendall, LaSalle	44 min
Jun 4, 1:22 PM CDT	Severe Thunderstorm Warning	LOT	DuPage, Will	38 min
Jun 4, 1:37 PM CDT	Severe Thunderstorm Warning	LOT	Cook	38 min
Jun 4, 1:44 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, LaSalle	46 min
Jun 4, 1:45 PM CDT	Special Marine Warning	LOT		60 min
Jun 4, 1:45 PM CDT	Special Marine Warning	LOT		60 min
Jun 4, 1:45 PM CDT	Special Marine Warning	LOT		60 min
Jun 4, 2:28 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle, Livingston	47 min
Jun 4, 2:35 PM CDT	Tornado Warning	LOT	LaSalle, Livingston	40 min
Jun 4, 3:17 PM CDT	Tornado Warning	LOT	Livingston	28 min
Jun 4, 4:04 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Livingston	26 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2002 Every severe thunderstorm warning in 2002

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.