Alert archive / Iowa / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 164, NWS Des Moines, IA

August 18, 1990Emmet County, Palo Alto County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 18, 1990, 8:39 PM CDT for Emmet County, Palo Alto County, Iowa. It was in force for 21 min.

The area

The counties it named.

The facts

Issued
Aug 18, 1990, 8:39 PM CDT (01:39 UTC)
Expired
Aug 18, 1990, 9:00 PM CDT
In force
21 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Emmet County, IA, Palo Alto 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 00:00Z, 1.7 hours before the alert went out and 200 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 00:00Z on 1990-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 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 00:00Z on 1990-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.1939Sfc1 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
651 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
215 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, Aug 18, 8:23 PM CDT, 16 minutes before
IAZALL-190200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
815 PM CDT SAT AUG 18 1990

HEAVY RAINS AND STRONG WINDS REPORTED IN NORTHWEST IOWA THIS EVENING.

REPORTS RECEIVED AT THE WEATHER OFFICE INDICATED THUNDERSTORMS MOVING
ACROSS NORTHWEST IOWA WERE PRODUCING HEAVY RAINS...UP TO FOUR INCHES
AT OCHEYEDAN IOWA IN OSCEOLA COUNTY...AND WINDS ESTIMATED TO BE IN
EXCESS OF 50 MILES AN HOUR AT LAKE PARK IOWA IN DICKINSON COUNTY.q

PEOPLE IN NORTHWESTERN IOWA SHOULD BE AWARE OF THESE STORMS AND
THEIR HISTORY OF PRODUCING HEAVY RAINS AND GUSTY SURFACE WINDS.

FORSTER

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 18, 9:04 PM CDTSevere Thunderstorm WarningDMXKossuth, Palo Alto41 min
Aug 19, 4:46 PM CDTSevere Thunderstorm WarningDMXBoone, Polk, Story29 min
Aug 19, 5:53 PM CDTSevere Thunderstorm WarningDMXHancock, Wright27 min

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.