Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 160, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 9, 1990, 10:11 PM CDT for Hardin County, Iowa. It was in force for 34 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 9, 1990, 10:11 PM CDT (03:11 UTC)
- Expired
- Aug 9, 1990, 10:45 PM CDT
- In force
- 34 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Hardin County, IA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 9, 10:30 PM CDT | Thunderstorm Wind 50 | Hardin, IA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Minneapolis, MN (KSTC), launched 00:00Z, 3.2 hours before the alert went out and 276 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.
- Mixed-layer CAPE
- 230 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 1690 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 9, 9:15 PM CDT, 56 minutes before
IAZ002-003-007-080300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 910 PM CDT THU AUG 8 1990 AT 905 PM CDT SHOWERS AND THUNDERSTORMS WERE OCCURRING IN A 25 MILE WIDE BAND FROM 5 MILES NORTH OF HAMPTON TO DECORAH. THE STRONGEST STORMS WERE IN SOUTHEAST CERRO GORDO COUNTY NEAR THE TOWN OF DOUGHERTY AND SOUTHERN FLOYD COUNTY BETWEEN MARBLE ROCK AND CHARLES CITY. THESE STORMS WILL PRODUCE HEAVY RAINS...DEADLY LIGHTNING...AND SOME SMALL HAIL. THESE STORMS WERE MOVING TO THE SOUTH AT 20 MILES AN HOUR. THESE STORMS WILL CONTINUE TO MOVE SOUTH INTO FRANKLIN AND BUTLER COUNTIES AND AFFECT THE CITIES OF HAMPTON...SHEFFIELD...CLARKSVILLE AND GREENE. PEOPLE SHOULD BE ALERT FOR TMHREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF IN THE PATH OF THESE STORMS. COLLAR
Special weather statement, Aug 9, 10:06 PM CDT, 5 minutes before
IAZ002-003-007-100400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1005 PM CDT THU AUG 9 1990 AT 955 PM CDT SHOWERS AND THUNDERSTORMS WERE OCCURRING IN A 25 MILE WIDE BAND FROM 5 MILES NORTH OF GRUNDY CENTER THROUGH NEW HARTFORD TO 10 MILES NORTHEAST OF WAVERLY. THESE STORMS WILL PRODUCE HEAVY RAINS ...DEADLY LIGHTNING...AND POSSIBLY SOME SMALL HAIL. THE STORMS WERE MOVING TO THE SOUTH AT 20 TO 25 MILES AN HOUR. THESE STORMS WILL CONTINUE TO MOVE THROUGH GRUNDY AND BLACK HAWK COUNTY AND AFFECT THE CITIES OF WATERLOO...CEDAR FALLS..AND THE GRUNDY CENTER AREA BETWEEN 1000 AND 1100 PM CDT. PEOPLE SHOULD BE ALERT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF IN THE PATH OF THESE STORMS. COLLAR
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 11:44 PM CDT | Severe Thunderstorm Warning | DMX | Story | 31 min |
| Aug 10, 12:49 AM CDT | Severe Thunderstorm Warning | DMX | Boone | 34 min |
| Aug 10, 12:49 AM CDT | Severe Thunderstorm Warning | DMX | Dallas | 41 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.