Alert archive / Illinois / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 41, NWS Lincoln, IL

May 17, 1991Bureau County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at May 17, 1991, 6:03 PM CDT for Bureau County, Illinois. It was in force for 57 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 17, 1991, 6:03 PM CDT (23:03 UTC)
Expired
May 17, 1991, 7:00 PM CDT
In force
57 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County Bureau County, IL

What was reported inside it

TimeReportWhereRemark
May 17, 6:45 PM CDTHail 1Bureau, IL
May 17, 7:00 PM CDTHail 1Bureau, IL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.1 hours before the alert went out and 361 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 1991-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 1991-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
532 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
54 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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.

In the hours before

Special weather statement, May 17, 3:19 PM CDT, 2 hours 44 minutes before
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Special weather statement, May 17, 4:03 PM CDT, 2 hours before
ILZ009-010-172200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD IL
4 00 PM CDT FRI MAY 17 1991

...TORNADO WATCH UNTIL 9 PM CDT FOR PORTIONS OF CENTRAL AND EASTERN
   ILLINOIS...

AT 355 PM CDT WEATHER RADARS INDICATES SHOWERS AND THUNDERSTORMS
CONTINUE TO DEVELOP IN CHAMPAIGN AND VERMILION COUNTIES IN EAST
CENTRAL ILLINOIS. THE STORM WAS MOVING EAST NORTHEAST AT 25 MPH.

OTHER SHOWERS AND THUNDERSTORMS CONTINUE TO DEVELOP OVER WEST CENTRAL
AND NORTHWEST ILLINOIS.
NO SEVERE WEATHER HAS BEEN REPORTED TO THE NATIONAL WEATHER SERVICE
IN SPRINGFIELD DURING THE PAST HOUR.
HILLIARD
Special weather statement, May 17, 4:20 PM CDT, 1 hour 43 minutes before
ILZ005>007-009-172215-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
415 PM CDT FRI MAY 17 1991

...TORNADO WATCH IN EFFECT FOR MUCH OF WEST CENTRAL ILLINOIS TILL 9 PM CDT...

AT 410 PM...RADAR INDICATED A STRONG THUNDERSTORM IN NORTHERN WARREN COUNTY
ABOUT 5 MILES NORTH OF MONMOUTH. THIS STORM WAS MOVING NORTHEAST AT 30 MPH
AND WILL MOVE OUT OF WARREN AND AFFECT THE NORTHWESTERN PORTIONS OF KNOX
COUNTY. TOWNS IN THE VICINITY OF THIS STORM ARE RIO AND ONTARIO.

TORNADOES...LARGE HAIL AND HEAVY RAINS ARE POSSIBLE WITH THIS STORM.

MOGGED
Special weather statement, May 17, 4:57 PM CDT, 1 hour 6 minutes before
ILZ009-010-172300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD IL
4 55 PM CDT FRI MAY 17 1991

...TORNADO WATCH UNTIL 9 PM CDT FOR PORTIONS OF CENTRAL AND EASTERN
   ILLINOIS...

AT 455 PM CDT WEATHER RADAR INDICATED SHOWERS AND THUNDERSTORMS OVER
CENTRAL VERMILION COUNTY.  THUNDERSTORMS CONTINUED TO DEVELOP WEST OF
DANVILLE...NEAR OAKWOOD AND MOVE EAST NORTHEAST AT 25 MPH TOWARD DANVILLE.

AT 450 PM...DANVILLE FIRE DEPARTMENT REPORTED HEAVY RAINS AND STREET
FLOODING.  HEAVY RAINS WILL CONTINUE OVER CENTRAL VERMILION COUNTY
THROUGH 6 PM AS THESE STORMS CONTINUE TO DEVELOP.

OTHERWISE...NO THUNDERSTORMS OR SEVERE WEATHER HAVE BEEN OBSERVED OVER
CENTRAL OR EAST CENTRAL ILLINOIS SINCE 4 PM.

DB
Special weather statement, May 17, 5:19 PM CDT, 44 minutes before
ILZ005>007-009-172315-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
515 PM CDT FRI MAY 17 1991

...TORNADO WATCH IN EFFECT FOR MUCH OF WEST CENTRAL ILLINOIS TILL 9 PM CDT...

AT 510 PM...RADAR INDICATED A STRONG THUNDERSTORM IN SOUTHERN HENRY COUNTY
NEAR THE TOWN OF ALPHA. THIS STORM IS MOVING EAST NORTHEAST AT AROUND
30 MPH. THIS WILL AFFECT THE NORTHWEST PORTIONS OF BUREAU COUNTY BY 6 PM. TOWNS
THAT WILL BE AFFECTED BY THIS STORM ARE THOMAS...NEW BEDFORD AND MANLIUS.

ANOTHER STORM LOCATED 30 MILES SOUTHWEST OF BURLINGTON WILL CROSS THE
MISSISSIPPI RIVER AROUND 6 PM AFFECTING NORTHERN HENDERSON AND WARREN
COUNTIES.

THESE ARE STRONG STORMS WITH HEAVY RAIN FALL...LARGE HADIL AND POSSIBLE
TORNADOES.

MOGGED

The office that day

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

IssuedProductOfficeCountiesLasted
May 17, 2:08 PM CDTSevere Thunderstorm WarningILXChampaign, Vermilion67 min
May 17, 6:41 PM CDTSevere Thunderstorm WarningILXHancock, Henderson64 min
May 17, 6:55 PM CDTSevere Thunderstorm WarningILXBureau65 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1991Every severe thunderstorm warning in 1991

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.