Alert archive / Iowa / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 45, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 14, 1991, 9:37 PM CDT for Delaware County, Iowa. It was in force for 53 min. 2 reports 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
- Jun 14, 1991, 9:37 PM CDT (02:37 UTC)
- Expired
- Jun 14, 1991, 10:30 PM CDT
- In force
- 53 min
- Issued by
- NWS Quad Cities, IA
- Area
- Whole counties
County Delaware County, IA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 14, 9:55 PM CDT | Hail 0.75 | Delaware, IA | |
| Jun 14, 10:10 PM CDT | Thunderstorm Wind 52 | Delaware, 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, 2.6 hours before the alert went out and 320 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
- 807 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 1047 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 125 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 14, 4:40 PM CDT, 4 hours 57 minutes before
IAZ008-ILZ001-WIZ018-142230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DUBUQUE IA 440 PM CDT FRI JUN 14 1991 AT 435 PM CDT...RADAR INDICATED A STRONG THUNDERSTORM IN THE NORTHWEST PART OF CLAYTON COUNTY IOWA...AROUND THE CITY OF POSTVILLE...WHICH IS 45 MILES NORTHWEST OF DUBUQUE. THIS THUNDERSTORM WILL PRODUCE VERY HEAVY RAINS...FREQUENT LIGHTNING...ALONG WITH PEA TO MARBLE SIZE HAIL AS IT MOVES THROUGH THE NORTHWEST PART OF THE COUNTY. MOVEMENT OF THE THUNDERSTORM WAS NORTHEAST AT 30 MILES AN HOUR. KOWALSKI
Special weather statement, Jun 14, 6:44 PM CDT, 2 hours 53 minutes before
IAZ008-150045- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DUBUQUE IA 644 PM CDT FRI JUN 14 1991 ...SEVERE THUNDERSTORM WATCH UNTIL 1000 PM CDT... AT 640 PM CDT STRONG THUNDERSTORMS WERE OCCURRING OVER NORTHERN CLAYTON COUNTY. THESE STORMS WERE PRODUCING HEAVY RAIN...SMALL HAIL...AND WIND GUSTS OF 30 TO 35 MPH. THE STORMS WERE MOVING TO THE EAST NORTHEAST AT 30 MPH. WITH THE LARGE AMOUNTS OF RAIN THAT HAVE FALLEN IN A SHORT PERIOD OF TIME...SOME FLOODING OF SMALL STREAMS MAY BE OCCURRING. DO NOT ATTEMPT TO CROSS A STREAM THAT IS FLOWING OVER A ROAD. SHOWERS AND THUNDERSTORMS CONTINUE TO DEVELOP TO THE WEST OF CLAYTON COUNTY...THEREFORE THE THREAT FOR ADDITIONAL FLOODIN'G WILL CONTINUE UNTIL THE STORMS PASS. IF THREATENING WEATHER OR FLOOD WATERS APPROACH YOUR AREA BE PREPARED TO TAKE SHELTER OR MOVE TO HIGHER GROUND. IRELAND NNNN
Local storm report, Jun 14, 7:25 PM CDT, 2 hours 12 minutes before
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</html>The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 14, 7:06 PM CDT | Flash Flood Warning | DVN | Clayton | 3 hr |
| Jun 14, 11:16 PM CDT | Flash Flood Warning | DVN | Clayton | 3 hr |
Nearby
Severe Thunderstorm Warnings in Iowa, 1991Every severe thunderstorm warning in 1991
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.