Alert archive / Illinois / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 55, NWS Quad Cities, IA

June 1, 2002Hancock County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 1, 2002, 4:50 AM CDT for Hancock County, Illinois. It was in force for 40 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: Jun 1, 2002, 4:50 AM CDT (09:50 UTC)
Expired: Jun 1, 2002, 5:30 AM CDT
In force: 40 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Hancock County, IL

The radar

The Quad Cities radar (KDVN), 130 km from the middle of the area, began a volume at 09:52 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 nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 9.8 hours before the alert went out and 218 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3066 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 244 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

461 
WUUS53 KDVN 010950
SVRMLI
ILC067-011030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
449 AM CDT SAT JUN 1 2002

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HANCOCK COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 530 AM CDT

* AT 447 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS OVER
  COLUSA...OR 9 MILES EAST OF FORT MADISON...MOVING SOUTHEAST AT 35
  MPH.

* THE SEVERE THUNDERSTORM IS EXPECTED TO BE NEAR...
   COLUSA NOW.
   ADRIAN BY 455 AM CDT.
   BURNSIDE BY 500 AM CDT.
   WEBSTER BY 505 AM CDT.

THIS SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING HAIL UP TO 1 INCH IN
DIAMETER AND WINDS IN EXCESS OF 55 MPH. TAKE COVER IN A STURDY
STRUCTURE UNTIL THE STORM PASSES.

LAT...LON 4062 9119 4058 9124 4034 9106 4044 9092

$$
08

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 Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 1, 2:47 AM CDT, 2 hours 3 minutes earlier.

Area forecast discussion, Jun 1, 2:47 AM CDT, 2 hours 3 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
247 AM CDT SAT JUN 1 2002

SYNOPTIC PICTURE THIS MORNING SHOWS A 115KT JET OVER THE GREAT LAKES.
A 500H TROF EXTENDS FROM NORTHERN ONTARIO INTO THE APPALACHIANS...
WITH WNW FLOW EXTENDING WEST INTO THE ROCKIES.  A STRONG HIGH IS
CENTERED OVER NEW MEXICO.  AT THE SURFACE...A STATIONARY FRONT
EXTENDS ACROSS SOUTH CENTRAL IOWA INTO WEST CENTRAL ILLINOIS.
CONVECTION IS PROPAGATING FROM NORTHWEST TO SOUTHEAST ALONG THIS
FRONT...ALONG THE 300-700 THICKNESS LINES.

THE MODELS INITIALIZED WELL AT 00Z...WITH THE AVN AND NGM OUT-DOING
THE ETA ON SURFACE INITIALIZATION.

THE PRIMARY FORECAST CONCERN THIS PACKAGE IS THE STATIONARY FRONT
ACROSS THE SOUTHERN PORTION OF THE FORECAST AREA...WHICH WILL REMAIN
IN THE VICINITY THRU MONDAY NIGHT...BEFORE GETTING KICKED OUT TUESDAY
AS A LOW MOVES THRU THE AREA.  THIS WILL KEEP PRECIP IN THE FORECAST
THRU AT LEAST TUESDAY...WITH A POSSIBILITY LINGERING INTO WEDNESDAY.
THE POTENTIAL FOR HEAVY RAIN OVER AREAS THAT ARE ALREADY SATURATED
WILL BE ONE CONCERN.  ANOTHER WILL BE SEVERE POTENTIAL TONIGHT AND
AGAIN SUNDAY NIGHT.  ANOTHER CHALLENGE THIS PACKAGE WILL BE
SIGNIFICANT DIFFERENCES IN TEMPERATURES FROM NORTH TO SOUTH IN SOME
PERIODS.

THE SHORT-TERM MODELS AGREE ON THE SURFACE FRONT REMAINING ACROSS
SOUTHERN PORTIONS OF THE FORECAST AREA TODAY...SINKING SOUTH TO AT
LEAST THE MISSOURI STATE LINE TONIGHT...OR A LITTLE FURTHER SOUTH
ACCORDING TO THE ETA AND NGM.  THE LOW-LEVEL JET SETS UP AGAIN OUT
WEST TOWARDS OMA.  WILL HAVE SIMILAR SEVERE POTENTIAL AS THIS PAST
NIGHT.  ON SUNDAY...THE FRONT LIFTS A BIT NORTH...BUT STILL ACROSS
SOUTHERN PORTIONS.  ON SUNDAY NIGHT THE FRONT REMAINS STATIONARY
SOUTH...WITH THE NOSE LLJ MOVE BROADLY SPREAD ACROSS SOUTHERN IOWA...
INTO WEST CENTRAL ILLINOIS.  FRONT STILL QUASI-STATIONARY THRU MONDAY
AND MONDAY NIGHT...WITH LOW MOVING FROM WEST TO EAST ALONG FRONT
MONDAY NIGHT AND EARLY TUESDAY...KICKING SYSTEM OUT TO EAST BY
TUESDAY EVENING...ALTHOUGH EUROPEAN AND UK STILL INDICATE POTENTIAL
FOR PRECIP INTO EARLY WEDNESDAY.  AT 500H...WNW FLOW CONTINUES OVER
NEXT FEW DAYS...WITH A WEAK SHORT WAVE POSSIBLE ON SUNDAY.  ON SUNDAY
NIGHT A RIDGE BUILDS IN AT 500H AND CONTINUES TO REMAIN OVERHEAD INTO
WEDNESDAY....WITH A HIGH AMPLITUDE TROF MOVING OVER THE FORECAST AREA
ON THURSDAY.

THE POTENTIAL FOR HEAVY RAIN WILL CONTINUE THRU THE NEXT 4 DAYS...
WITH THE PRIMARY FOCUS FOR WIDESPREAD HEAVY RAINS PROBABLY MONDAY
NIGHT INTO TUESDAY...AS THE LOW MOVES EAST ALONG THE FRONT.

WILL STAY CLOSE TO CURRENT FORECAST...MAYBE ELIMINATING SEVERE
WORDING IN ONE OR TWO PERIODS. HEAT INDICES WILL BE HIGH CENTRAL AND
SOUTH TODAY...BUT NOT NECESSARILY HIGH ENUF TO MENTION SPECIFIC
NUMBERS.

.DVN...
IA...NONE.
IL...NONE.
MO...NONE.

REA

In the hours before

Local storm report, Jun 1, 1:15 AM CDT, 3 hours 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
115 AM CDT SAT JUN 01 2002

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

0100 AM    FAIRFIELD                 IA   1 INCH HAIL
06/01/02   JEFFERSON                      REPORTED BY MEDIA.

Local storm report, Jun 1, 2:39 AM CDT, 2 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
239 AM CDT SAT JUN 01 2002

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

0227 AM    FAIRFIELD                 IA   .5 INCH HAIL
06/01/02   JEFFERSON                      EVENT DURATION 10
                                          MINUTES. REPORTED BY
                                          MEDIA.

Local storm report, Jun 1, 2:49 AM CDT, 2 hours 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
249 AM CDT SAT JUN 01 2002

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

0230 AM    1 S LIBERTYVILLE          IA   .75 INCH HAIL
06/01/02   JEFFERSON                      REPORTED BY STORM
                                          SPOTTER.

Local storm report, Jun 1, 3:57 AM CDT, 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
357 AM CDT SAT JUN 01 2002

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

0355 AM    MT PLEASANT               IA   .75 INCH HAIL
06/01/02   HENRY

Local storm report, Jun 1, 4:08 AM CDT, 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
408 AM CDT SAT JUN 01 2002

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

0355 AM    MT PLEASANT               IA   .75 INCH HAIL
06/01/02   HENRY                          EVENT DURATION 5
                                          MINUTES. REPORTED BY
                                          STORM SPOTTER.

Local storm report, Jun 1, 4:28 AM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
428 AM CDT SAT JUN 01 2002

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

0426 AM    DENMARK                   IA   .88 INCH HAIL
06/01/02   LEE                            REPORTED BY STORM
                                          SPOTTER.

0426 AM    DENMARK                   IA   50-60 MPH TSTM GUST
06/01/02   LEE                            REPORTED BY STORM
                                          SPOTTER.

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 1, 12:15 AM CDT	Severe Thunderstorm Warning	DVN	Henderson	45 min
Jun 1, 6:24 AM CDT	Severe Thunderstorm Warning	DVN	McDonough	36 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.