Alert archive / Iowa / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 14, NWS Quad Cities, IA

June 12, 1990Clayton County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 12, 1990, 6:16 PM CDT for Clayton County, Iowa. It was in force for 44 min.

The area

The counties it named.

The facts

Issued
Jun 12, 1990, 6:16 PM CDT (23:16 UTC)
Expired
Jun 12, 1990, 7:00 PM CDT
In force
44 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Clayton County, IA

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

Minneapolis, MN (KSTC), launched 12:00Z, 11.3 hours before the alert went out and 287 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 1990-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 966 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, Minneapolis, MN at 12:00Z on 1990-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 187 square meters per square second.1939587897Sfc1 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
966 J/kg
Mixed-layer CIN
-164 J/kg
Mixed-layer LCL
781 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
187 m²/s²
0-3 km storm-relative helicity
191 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.

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, Jun 12, 5:48 PM CDT, 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DUBUQUE IA
545 PM CST TUE JUN 12 1990

...THUNDERSTORMS ENTERING CLAYTON COUNTY...

AT 545 PM WEATHER RADAR INDICATED THAT THUNDERSTORMS WERE MOVING
IN TO THE NORTHWESTERN AREAS OF CLAYTON COUNTY...RAINSHOWERS
AND DANGEROUS LIGHTNING ARE ASSOCIATED WITH THESE THUNDERSTORMS.

PERSONS IN CLAYTON COUNTY SHOULD BE AWARE OF THESE THUNDERSTORMS
AND SEEK PROTECTIVE SHELTER SHOULD THEY APPROACH.

DEROY$

Nearby

Severe Thunderstorm Warnings in Iowa, 1990Every 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.