Alert archive / Iowa / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 55, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at May 14, 1991, 12:34 PM CDT for Black Hawk County, Iowa. It was in force for 41 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
- May 14, 1991, 12:34 PM CDT (17:34 UTC)
- Expired
- May 14, 1991, 1:15 PM CDT
- In force
- 41 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Black Hawk County, IA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 14, 12:40 PM CDT | Hail 0.75 | Black Hawk, 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 12:00Z, 5.6 hours before the alert went out and 284 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
- 3158 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 111 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 14, 10:29 AM CDT, 2 hours 5 minutes before
IAZALL-140540- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1020 AM CDT TUE MAY 14 1991 AT 10 15 AM...INTENSE THUNDERSTORMS WITH VERY HEAVY RAINS AND HAIL WERE LOCATED IN CENTRAL IOWA IN A LARGE AREA MIDWAY BETWEEN DES MOINES AND WATERLOO. THE MOST INTENSE STORMS WERE LOCATED ABOUT 10 MILES NORTH OF MARSHALLTOWN...OR 40 MILES SOUTHWEST OF WATERLOO. VERY HEAVY RAINS... HAIL...DANGEROUS LIGHTNING AND WINDS IN EXCESS OF 50 MILES AN HOUR CAN BE EXPECTED WITH THESE STORMS. THESE STORMS WERE MOVING NORTHEAST AT 15 MILES AN HOUR. THUNDERSTORMS WITH VERY HEAVY RAINS AND HAIL CONTINUED IN SOUTH CENTRAL IOWA. THESE STORMS WERE LOCATED NEAR CORYDON AND ALLERTON...ABOUT 50 MILES SOUTH OF DES MOINES. THE PRECIPITATION WAS MOVING SOUTHEAST AT 15 MILES AN HOUR. SCOTT
Special weather statement, May 14, 10:47 AM CDT, 1 hour 47 minutes before
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</html>Special weather statement, May 14, 11:23 AM CDT, 1 hour 11 minutes before
IAZALL-141740- SPECIAL WEATHER STATEMENT AND IOWA WEATHER UPDATE NATIONAL WEATHER SERVICE DES MOINES IA 1115 AM CDT TUE MAY 14 1991 AT 11 10 AM...INTENSE THUNDERSTORMS WITH VERY HEAVY RAINS AND HAIL WERE LOCATED IN NORTHEAST IOWA IN THE WATERLOO AREA. THE MOST INTENSE STORMS WERE LOCATED BETWEEN GRUNDY CENTER AND WATERLOO...AND ALSO NEAR WALKER ...ABOUT 30 MILES SOUTHEAST OF WATERLOO VERY HEAVY RAINS...HAIL...AND DANGEROUS LIGHTNING CAN BE EXPECTED WITH THESE STORMS. THESE STORMS WERE MOVING NORTHEAST AT 15 MILES AN HOUR. THUNDERSTORMS WITH VERY HEAVY RAINS AND HAIL CONTINUED IN SOUTH CENTRAL IOWA. THESE STORMS WERE LOCATED NEAR SEYMOUR...CENTERVILLE AND MYSTIC ...25 THROUGH 50 MILES SOUTHWEST OF OTTUMWA. THESE STORMS WERE MOVING SOUTHEAST AT 15 MILES AN HOUR. SCOTT
Special weather statement, May 14, 11:47 AM CDT, 47 minutes before
IAZALL-141740- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1145 AM CDT TUE MAY 14 1991 AT 11 40 AM...INTENSE THUNDERSTORMS WITH VERY HEAVY RAINS AND HAIL WERE LOCATED IN NORTHEAST IOWA IN THE WATERLOO AREA. THE MOST INTENSE STORMS WERE LOCATED ABOUT 10 MILES SOUTHWEST OF WATERLOO. THESE STORMS WERE MOVING TO THE NORTHEAST AT 20 MILES AN HOUR. VERY HEAVY RAINS...HAIL... NAD DANGEROUS LIGHTNING CAN BE EXPECTED WITH THESE STORMS. THESE STORMS WERE MOVING NORTHEAST AT 15 MILES AN HOUR. THUNDERSTORMS WITH VERY HEAVY RAINS AND HAIL CONTINUED IN SOUTH CENTRAL IOWA. THE HEAVIEST OF THESE STORMS WAS LOCATED OVER RATHBUN RESERVOIR ...ABOUT 40 MILES SOUTHLEAST OF OTTUMWA. VERY HEAVY RAINS...LIGHTNING... AND HAIL CAN ALSO BE EXPECTED WITH THESE STORMS. THESE STORMS WERE MOVING SOUTHEAST AT 15 MILES AN HOUR. SCOTT
Special weather statement, May 14, 11:53 AM CDT, 41 minutes before
IAZALL-141740- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1145 AM CDT TUE MAY 14 1991 AT 11 40 AM...INTENSE THUNDERSTORMS WITH VERY HEAVY RAINS AND HAIL WERE LOCATED IN NORTHEAST IOWA IN THE WATERLOO AREA. THE MOST INTENSE STORMS WERE LOCATED ABOUT 10 MILES SOUTHWEST OF WATERLOO. THESE STORMS WERE MOVING TO THE NORTHEAST AT 20 MILES AN HOUR. VERY HEAVY RAINS...HAIL... NAD DANGEROUS LIGHTNING CAN BE EXPECTED WITH THESE STORMS. THESE STORMS WERE MOVING NORTHEAST AT 15 MILES AN HOUR. THUNDERSTORMS WITH VERY HEAVY RAINS AND HAIL CONTINUED IN SOUTH CENTRAL IOWA. THE HEAVIEST OF THESE STORMS WAS LOCATED OVER RATHBUN RESERVOIR ...ABOUT 40 MILES S[OUTHWEST OF OTTUMWA. VERY HEAVY RAINS...LIGHTNING... AND HAIL CAN ALSO BE EXPECTED WITH THESE STORMS. THESE STORMS WERE MOVING SOUTHEAST AT 15 MILES AN HOUR. SCOTT
Special weather statement, May 14, 12:18 PM CDT, 16 minutes before
IAZALL-141840- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1220 PM CDT TUE MAY 14 1991 AT 12 15 PM...INTENSE THUNDERSTORMS WITH VERY HEAVY RAINS AND HAIL WERE LOCATED IN NORTHEAST IOWA IN THE WATERLOO AREA. THE MOST INTENSE STORMS WERE LOCATED ABOUT 10 MILES SOUTHEAST OF WATERLOO. THESE STORMS WERE MOVING TO THE NORTHEAST AT 20 MILES AN HOUR. VERY HEAVY RAINS...HAIL... NAD DANGEROUS LIGHTNING CAN BE EXPECTED WITH THESE STORMS. THUNDERSTORMS WITH VERY HEAVY RAINS AND HAIL CONTINUED IN SOUTH CENTRAL IOWA. THE HEAVIEST OF THESE STORMS WAS LOCATED ABOUT 15 MILES WEST OF OTTUMWA...NEAR ALBIA. VERY HEAVY RAINS AND HAIL CAN ALSO BE EXPECTED WITH THESE STORMS. THESE STORMS WERE ALSO MOVING NORTHEAST AT 15 MILES AN HOUR. SCOTT
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 14, 8:33 AM CDT | Severe Thunderstorm Warning | DMX | Lucas | 42 min |
| May 14, 8:44 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Polk, Story | 46 min |
| May 14, 9:03 AM CDT | Severe Thunderstorm Warning | DMX | Boone | 42 min |
| May 14, 9:15 AM CDT | Severe Thunderstorm Warning | DMX | Lucas | 45 min |
| May 14, 9:43 AM CDT | Severe Thunderstorm Warning | DMX | Marshall | 47 min |
| May 14, 10:00 AM CDT | Severe Thunderstorm Warning | DMX | Wayne | 45 min |
| May 14, 10:36 AM CDT | Severe Thunderstorm Warning | DMX | Grundy | 69 min |
| May 14, 10:50 AM CDT | Severe Thunderstorm Warning | DMX | Wayne | 40 min |
| May 14, 11:05 AM CDT | Severe Thunderstorm Warning | DMX | Appanoose | 40 min |
| May 14, 11:17 AM CDT | Severe Thunderstorm Warning | DMX | Buchanan | 58 min |
| May 14, 11:26 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 64 min |
| May 14, 12:04 PM CDT | Severe Thunderstorm Warning | DMX | Fayette | 38 min |
| May 14, 12:43 PM CDT | Severe Thunderstorm Warning | DMX | Benton | 47 min |
| May 14, 1:01 PM CDT | Severe Thunderstorm Warning | DMX | Linn | 44 min |
| May 14, 1:12 PM CDT | Severe Thunderstorm Warning | DMX | Buchanan | 33 min |
| May 14, 1:30 PM CDT | Severe Thunderstorm Warning | DMX | Linn | 45 min |
| May 14, 1:40 PM CDT | Tornado Warning | DMX | Linn | 35 min |
| May 14, 1:52 PM CDT | Severe Thunderstorm Warning | DMX | Benton | 21 min |
| May 14, 2:24 PM CDT | Severe Thunderstorm Warning | DMX | Benton | 66 min |
| May 14, 5:05 PM CDT | Severe Thunderstorm Warning | DMX | Wright | 40 min |
| May 14, 5:22 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock | 68 min |
| May 14, 5:49 PM CDT | Severe Thunderstorm Warning | DMX | Wright | 41 min |
| May 14, 6:42 PM CDT | Severe Thunderstorm Warning | DMX | Polk, Warren | 63 min |
| May 14, 6:56 PM CDT | Tornado Warning | DMX | Polk | 34 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.