Alert archive / Iowa / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 33, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at May 17, 1991, 3:46 PM CDT for Delaware County, Iowa. It was in force for 59 min.
The area
The counties it named.
The facts
- Issued
- May 17, 1991, 3:46 PM CDT (20:46 UTC)
- Expired
- May 17, 1991, 4:45 PM CDT
- In force
- 59 min
- Issued by
- NWS Quad Cities, IA
- Area
- Whole counties
County Delaware County, IA
The nearest sounding before it
Minneapolis, MN (KSTC), launched 12:00Z, 8.8 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- NaN m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -30 m²/s²
- 0-3 km storm-relative helicity
- 49 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, May 17, 2:49 PM CDT, 57 minutes before
IAZ008-ILZ001-WIZ018-172045- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DUBUQUE IA 255 PM CDT FRI MAY 17 1991 ...TORNADO WATCH FOR MUCH OF TRI-STATE AREA UNTIL 900 PM CDT... AT 250 PM CDT...NO STORMS WERE IN THE TRI-STATE AREA...HOWEVER THERE WERE STORMS 40 MILES SOUTHWEST AND 60 MILES WEST OF DUBUQUE THAT WERE MOVING NORTH AT 20 MILES AN HOUR. SEVERE STORMS MAY DEVELOP ANYWHERE OVER THE TRI-STATE AREA THE REMAINDER OF THIS AFTERNOON...AND TORNADOES SPAWN FROM SEVERE THUNDERSTORMS SO BE ON THE LOOKOUT FOR DANGEROUS STORMS AND IF THREATENING WEATHER IS SIGHTED...TAKE COVER IMMEDIATELY. GRANT COUNTY AND LAFAYETTE COUNTY IN WISCONSIN...PLUS JO-DAVIES COUNTY IN ILLINOIS ARE $NOT IN THIS WATCH AT THIS TIME BUT MAY ALSO RECEIVE SOME SEVERE WEATHER. KOWALSKI NNNN
Special weather statement, May 17, 3:14 PM CDT, 32 minutes before
IAZ008-ILZ001-WIZ018-172115- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DUBUQUE IA 314 PM CDT FRI MAY 17 1991 ...TORNADO WATCH FOR MUCH OF TRI-STATE AREA UNTIL 900 PM CDT... AT 310 PM CDT...RADAR INDICATED SHOWERS AND THUNDERSTORMS IN THE SOUTHWEST PART OF THE TRI-STATE AREA...NEAR ANAMOSA AND MONTICELLO IN JONES COUNTY...30 TO 40 MILES SOUTHWEST OF DUBUQUE. ELSEWHERE...SHOWERS AND A FEW THUNDERSTORMS WERE LOCATED 40 TO 60 MILES WEST THROUGH SOUTHWEST OF DUBUQUE. MOVEMENT OF THE STORMS WERE NORTHEAST AT 20 MILES AN HOUR AND WILL CONTINUE TO MOVE THROUGH JONES COUNTY. NO SEVERE WEATHER WAS IN THE AREA AT THIS 310 PM CDT. THE TORNADO WATCH DOES NOT INCLUDE GRANT AND GLAFAYETTE COUNTIES IN WISCONSIN...OR JO-DAVIES COUNTY IN ILLINOIS AT THIS TIME. KOWALSKI NNNN
Special weather statement, May 17, 3:24 PM CDT, 22 minutes before
ILZ004-IAZ015-172230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOLINE IL 320 PM CDT FRI MAY 17 1991 ...STRONG THUNDERSTORMS APPROACHING THE BISTATE AREA... AT 330 PM... RADAR INDICATED AN AREA OF STRONG THUNDERSTORMS MOVING TOWARD THE IOWA PORTIONS OF THE BISTATE AREA. THE STORMS WERE MOVING INTO MUSCATINE AND CEDAR COUNTIES. THESE STORMS HAVE A HISTORY OF PRODUCING HAIL...HEAVY RAINS AND STRONG WINDS. THE STORMS WERE MOVING NORTHEAST AT 30 MPH. OTHER STORMS WERE DEVELOPING NEAR KEITHSBURG ILLINOIS. THESE STORMS WERE DEVELOPING RAPIDLY AND MOVING NORTHEAST AT 30 MPH. LAGUE
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 17, 3:59 PM CDT | Tornado Warning | DVN | Muscatine | 31 min |
| May 17, 4:19 PM CDT | Tornado Warning | DVN | Scott | 41 min |
| May 17, 4:48 PM CDT | Tornado Warning | DVN | Muscatine | 27 min |
| May 17, 5:02 PM CDT | Tornado Warning | DVN | Scott | 28 min |
| May 17, 6:13 PM CDT | Severe Thunderstorm Warning | DVN | Lee | 62 min |
| May 17, 6:21 PM CDT | Flash Flood Warning | DVN | Scott | 2 hr |
| May 17, 5:40 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Rock Island, Whiteside | 50 min |
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; the sounding from the Mesonet's radiosonde archive.