Alert archive / Iowa / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 4, NWS Quad Cities, IA

March 10, 1990Muscatine County, Scott County, Iowa; Rock Island County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Mar 10, 1990, 8:31 AM CST for Muscatine County, Scott County, Iowa; Rock Island County, Illinois. It was in force for 29 min.

The area

The counties it named.

The facts

Issued
Mar 10, 1990, 8:31 AM CST (14:31 UTC)
Expired
Mar 10, 1990, 9:00 AM CST
In force
29 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

Counties Muscatine County, IA, Scott County, IA, Rock Island County, IL

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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 2.5 hours before the alert went out and 393 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 12:00Z on 1990-03-10Temperature 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, Green Bay/Straub, WI at 12:00Z on 1990-03-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 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
627 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMLI 101431
SVRMLI
IAC163-139-ILC161-101500-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE MOLINE IL
831 AM CST SAT MAR 10 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 900 AM CST FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE EXTREME EAST PART OF IOWA
      SOUTHERN SCOTT...EASTERN MUSCATINE...

   IN THE NORTHWEST PART OF ILLINOIS
      WESTERN ROCK-ISLAND...

AT 815 AM ONE AND ONE HALF INCH HAIL WAS REPORTED AT THE
MUSCATINE AIRPORT NEAR MUSCATINE...25 MILES WEST OF MOLINE.

THE THUNDERSTORM WAS MOVING EAST AT 30 MILES AN HOUR.

SOME CITIES/TOWNS IN THE PATH OF THIS STORM INCLUDE... MUSCATINE
AND THE QUAD CITIES.

FOR YOUR PROTECTION GO TO A SAFE PLACE IMMEDIATELY.  STAY INDOORS
AND AVOID WINDOWS.  IF OUTDOORS...DO NOT STAND UNDER A TREE OR IN
OPEN AREAS SUCH AS A FIELD.

A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WIND OF 60 MPH OR MORE...
LARGE HAIL...FREQUENT DANGEROUS LIGHTNING AND HEAVY RAIN.

IF TIME PERMITS...ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY
YOUR REPORT OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.

ATTN ISP 7 AND 1

FOBERT

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, Mar 10, 6:23 AM CST, 2 hours 8 minutes before
IAZ008-WIZ018-ILZ001-101500-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DUBUQUE IA
620 AM CST SAT MAR 10 1990

...AREAS OF DENSE FOG IN AND AROUND THE TRI-STATE...

DENSE FOG CONTINUED IN AND AROUND THE TRI-STATE AREA THIS MORNING
WITH THE VISIBILITY AT DUBUQUE AIRPORT 1/8 MILE AND MANY AREAS IN
THE TRI-STATES REPORTING VISIBILITY NEAR ZERO.

THE FOG SHOULD START LIFTING BY MID MORNING AROUND DUBUQUE AND THE
TRI-STATE.

PERSONS TRAVELINNG IN THE TRI-STATE AREA SHOULD BE ALERT FOR THIS
FOG...DRIVE CAREFULLY WITH YOUR LOW BEAMS ON...AND LEAVE FOR YOUR
DESTINATION EARLIER THAN NORMAL.

DEROY

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 9, 11:09 PM CSTSevere Thunderstorm WarningDVNJones36 min
Mar 10, 12:17 AM CSTSevere Thunderstorm WarningDVNMuscatine43 min
Mar 10, 1:02 AM CSTSevere Thunderstorm WarningDVNScott43 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1990Severe Thunderstorm Warnings in Illinois, 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.