Alert archive / Illinois / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 30, NWS Chicago, IL

November 27, 1990Livingston County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Nov 27, 1990, 3:54 PM CST for Livingston County, Illinois. It was in force for 51 min.

The area

The counties it named.

The facts

Issued: Nov 27, 1990, 3:54 PM CST (21:54 UTC)
Expired: Nov 27, 1990, 4:45 PM CST
In force: 51 min
Issued by: NWS Chicago, IL
Area: Whole counties

County Livingston County, IL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Paducah/Barkley, KY (KPAH), launched 12:00Z, 9.9 hours before the alert went out and 425 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: 189 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 725 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 271 m²/s²
0-3 km storm-relative helicity: 280 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.9

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

Local storm report, Nov 27, 1:12 PM CST, 2 hours 42 minutes before

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Special weather statement, Nov 27, 2:34 PM CST, 1 hour 20 minutes before

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Special weather statement, Nov 27, 3:09 PM CST, 45 minutes before

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Special weather statement, Nov 27, 3:21 PM CST, 33 minutes before

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Special weather statement, Nov 27, 3:29 PM CST, 25 minutes before

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Special weather statement, Nov 27, 3:36 PM CST, 18 minutes before

ILZ001-002-272230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ROCKFORD IL
328 PM CST TUE NOV 22 1990

...TORNADO WATCH FOR MUCH OF NORTHERN ILLINOIS UNTIL 9 PM...

AT 3 25 PM CST...RADAR WAS INDICATING THAT SHOWERS AND THUNDERSTORMS
WAS COVERING MUCH OF THE AREA. THE STRONGEST THUNDERSTORMS WERE LOCATED
ALONG A LINE FROM JUST SOUTH OF ROCHELLE TO LA SALLE ILLINOIS...OR
ABOUT 20 TO 35 MILES SOUTH OF ROCKFORD. THE STORMS WERE MOVING TO THE
NORTHEAST AT 35 MPH.

SEVERE THUNDERSTORMS AND TORNADOES COULD DEVELOP AT ANY TIME...
ESPECIALLY NEAR TO AND EAST OF A LINE FROM ROCKFORD TO DIXON.
EVERYONE IN AND CLOSE TO THE WATCH AREA SHOULD BE ON THE LOOKOUT
FOR THEATENING WEATHER AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS FROM THE NATIONAL WEATHER SERVICE.

ATTN ISP DIST: 1...2...16.
SANDERS   ...RESEND...NO CHANGES...

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 27, 3:44 PM CST	Severe Thunderstorm Warning	LOT	Grundy, Kendall, LaSalle	46 min
Nov 27, 3:54 PM CST	Severe Thunderstorm Warning	LOT	Kane	51 min
Nov 27, 4:20 PM CST	Severe Thunderstorm Warning	LOT	Cook, DuPage, Will	35 min
Nov 27, 4:44 PM CST	Severe Thunderstorm Warning	LOT	Kankakee, Will	61 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1990 Every severe thunderstorm warning in 1990

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.