Alert archive / Illinois / Tornado Warnings in 1991

Tornado Warning 11, NWS Quad Cities, IA

May 31, 1991Henry County, Rock Island County, Illinois

NWS Quad Cities, IA issued this tornado warning at May 31, 1991, 3:27 PM CDT for Henry County, Rock Island County, Illinois. It was in force for 33 min.

The area

The counties it named.

The facts

Issued
May 31, 1991, 3:27 PM CDT (20:27 UTC)
Expired
May 31, 1991, 4:00 PM CDT
In force
33 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

Counties Henry County, IL, Rock Island County, IL

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 8.5 hours before the alert went out and 465 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, Minneapolis, MN at 12:00Z on 1991-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Minneapolis, MN at 12:00Z on 1991-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 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
NaN m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
62 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

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.

The office that day

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

IssuedProductOfficeCountiesLasted
May 31, 10:39 AM CDTSevere Thunderstorm WarningDVNJones66 min
May 31, 10:57 AM CDTSevere Thunderstorm WarningDVNDubuque63 min
May 31, 11:18 AM CDTSevere Thunderstorm WarningDVNJones42 min
May 31, 11:42 AM CDTSevere Thunderstorm WarningDVNGrant17 min
May 31, 12:12 PM CDTSevere Thunderstorm WarningDVNGrant, Lafayette36 min

Nearby

Tornado Warnings in Illinois, 1991Every tornado warning in 1991Tornadoes 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; the sounding from the Mesonet's radiosonde archive.