Alert archive / Iowa / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 26, NWS Quad Cities, IA

June 30, 1990Lee County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 30, 1990, 8:34 AM CDT for Lee County, Iowa. It was in force for 41 min.

The area

The counties it named.

The facts

Issued
Jun 30, 1990, 8:34 AM CDT (13:34 UTC)
Expired
Jun 30, 1990, 9:15 AM CDT
In force
41 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Lee 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

Omaha, NE (KOAX), launched 12:00Z, 1.6 hours before the alert went out and 417 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, Omaha, NE at 12:00Z on 1990-06-30Temperature 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, Omaha, NE at 12:00Z on 1990-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 square meters per square second.193958Sfc1 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
3663 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
37 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, Jun 30, 5:19 AM CDT, 3 hours 15 minutes before
IAZ008-WIZ018-ILZ001-301300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DUBUQUE IA
520 AM CDT SAT JUN 30 1990

...AREAS OF DENSE FOG COVERS THE TRI-STATE THIS MORNING...

SOME DENSE FOG FORMED OVERNIGHT IN THE TRI-STATE AREA AND THE
VISIBILITY AT THE DUBUQUE AREA WAS 1/8 OF A MILE...WITH NUMEROUS
OTHER REPORTS OF LOW VISIBILITY.

THE DENSE FOG SHOULD BURN OFF QUITE RAPIDLY AFTER SUNRISE...MEANWHILE
PERSONS IN THE TRI-STATE AREA SHOULD BEY ALERT WHILE DRIVING...USE
YOUR LOW BEAM HEADLIGHTS AND LEAVE FOR YOUR DESTINATION EARLY ENOUGH
TO ASSURE SAFE ARRIVAL.
KOWALSKI

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 30, 9:14 AM CDTSevere Thunderstorm WarningDVNLee31 min
Jun 30, 9:53 AM CDTSevere Thunderstorm WarningDVNLee52 min
Jun 30, 3:52 PM CDTFlash Flood WarningDVNJo Daviess3 hr

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.