Alert archive / Illinois / Tornado Warnings in 1992

Tornado Warning 6, NWS Quad Cities, IA

July 7, 1992Mercer County, Illinois

NWS Quad Cities, IA issued this tornado warning at Jul 7, 1992, 6:58 AM CDT for Mercer County, Illinois. It was in force for 32 min.

The area

The counties it named.

The facts

Issued
Jul 7, 1992, 6:58 AM CDT (11:58 UTC)
Expired
Jul 7, 1992, 7:30 AM CDT
In force
32 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Mercer County, IL

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 12.0 hours before the alert went out and 423 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 00:00Z on 1992-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 1992-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1946 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
99 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 tornado 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, Jul 7, 4:03 AM CDT, 2 hours 55 minutes before
ILZ004-IAZ015-070900-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOLINE IL
400 AM CDT TUE JUL 7 1992

AT 4 AM STRONG THUNDERSTORMS WERE MOVING ACROSS EASTERN IOWA
AND NORTHWEST ILLINOIS. THESE THUNDERSTORMS WERE MOVING SOUTHEAST
AT 40 MPH. SOME OF THESE STORMS MAY PRODUCE BRIEF HEAVY RAIN SMALL HAIL
AND GUSTY WINDS.
THE THUNDERSTORMS WILL CONTINUE ACROSS THE BISTATE AREA FOR THE NEXT
FEW HOURS.

SULLENS
Special weather statement, Jul 7, 6:23 AM CDT, 35 minutes before
ILZ004-IAZ015-071200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOLINE IL
620 AM CDT TUE JUL 7 1992

AT 620 AM A VERY  STRONG THUNDERSTORM WAS LOCATED IN NORTHERN LOUISA
COUNTY IN IOWA. THIS STORM WAS MOVING SOUTHEAST AT 30 MPH AND MAY
PRODUCE STRONG WINDS HEAVY RAIN AND SMALL HAIL. THE STORM WILL BE MOVING
INTO MERCER COUNTY IN ILLINOIS BY 7 AM.
NUMEROUS OTHER SHOWERS AND THUNDERSTORMS WERE OVER EASTERN IOWA AND NORTHWEST
ILLINOIS..

SJULLENS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 6:57 AM CDTTornado WarningDVNMercer33 min

Nearby

Tornado Warnings in Illinois, 1992Every tornado warning in 1992Tornadoes in 1992

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.