Alert archive / Iowa / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 6, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Mar 22, 1991, 6:11 PM CST for Black Hawk County, Iowa. It was in force for 49 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
- Mar 22, 1991, 6:11 PM CST (00:11 UTC)
- Expired
- Mar 22, 1991, 7:00 PM CST
- In force
- 49 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Black Hawk County, IA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Mar 22, 6:30 PM CST | Thunderstorm Wind 50 | 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
Omaha, NE (KOVN), launched 00:00Z, 0.2 hours before the alert went out and 360 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
- 91 J/kg
- Mixed-layer CIN
- -127 J/kg
- Mixed-layer LCL
- 1243 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- -45 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, Mar 22, 4:45 PM CST, 1 hour 26 minutes before
IAZALL-222340- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 344 PM CST FRI MAR 22 1991 ...A TORNADO WATCH IS IN EFFECT FOR MUCH OF CENTRAL AND SOUTHEAST IOWA UNTIL 9 PM... AT 432 PM...A 20 MILE WIDE BAND OF SCATTERED VERY INTENSE THUNDERSTORMS EXTENDED FROM SOUTH CENTRAL INTO NORTH CENTRAL IOWA. THE STORMS WERE LOCATED FROM 30 MILES EAST OF LAMONI...TO 40 MILES SOUTHWEST OF MASON CITY NEAR EAGLE GROVE. THESE STORMS HAVE BEEN PRODUCING PEA TO MARBLE SIZE AND LARGER HAIL...VERY HEAVY RAIN AND FREQUENT DEADLY LIGHTNING. THE STORMS WERE PART OF AN AREA OF SCATTERED SHOWERS AND THUNDERSTORMS OVER THE WEST TWO THIRDS OF IOWA...GENERALLY WEST OF A LINE F2ROM OTTUMWA TO WATERLOO. THE SHOWERS AND STORMS WERE MOVING NORTHEAST AT 35 MILES AN HOUR. JAK
Special weather statement, Mar 22, 5:06 PM CST, 1 hour 5 minutes before
IAZ002-003-007-221600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 505 PM CST FRI MAR 22 1991 ...A TORNADO WATCH IS IN EFFECT UNTIL 9 CST FOR CENTRAL IOWA... AT 5 PM SHOWERS AND THUNDERSTORMS WERE OCCURRING FROM MASON CITY THROUGH THROUGH HAMPTON TO JUST WEST OF GRUNDY CENTER. THE STRONGEST STORM WAS LOCATED 5 MILES NORTHWEST OF HAMPTON....20 MILES SOUTH OF MASON CITY. HOWEVER STRONGER STORMS WERE BEGINNING TO MOVE INTO GRUNDY COUNTY...25 MILES WEST OF WATERLOO. THESE STORMS MAY PRODUCE SOME SMALL HAIL...GUSTY WINDS AND DANGEROUS CLOUD TO GROUND LIGHTNING STROKES. THROUGH 6 PM THE SHOWERS AND THUNDERSTORMS WILL EFFECT GRUNDY CENTER ...PARKERSBURG...MARBLE ROCK AND OSUAGE. REMEMBER A TORNADO WATCH IS IN EFFECT AND ANY OF THESE STORMS MAY SPAWN A TORNADO IN A MOMENTS NOTICE. SO BE ALERT! COLLAR
Special weather statement, Mar 22, 5:16 PM CST, 55 minutes before
IAZALL-220015- SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR IOWA NATIONAL WEATHER SERVICE DES MOINES IA 515 PM CST FRI MAR 22 1991 ...A TORNADO WATCH IS IN EFFECT FOR MUCH OF CENTRAL AND SOUTHEAST IOWA UNTIL 9 PM... AT 510 PM...A 10 MILE WIDE LINE OF INTENSE THUNDERSTORMS WAS LOCATED FROM SOUTHEAST INTO NORTH CENTRAL IOWA. THE STORMS EXTENDED FROM 25 MILES SOUTH OF OTTUMWA AT MOULTON...TO 25 MILES SOUTH OF MASON CITY. THESE STORMS HAVE BEEN PRODUCING PEA TO MARBLE SIZE AND LARGER HAIL... VERY HEAVY RAIN AND FREQUENT DEADLY LIGHTNING. IN ADDITION...SHOWERS WERE OCCURRING OVER PARTS OF WEST CENTRAL AND NORTHWEST IOWA. THE SHOWERS AND STORMS WERE MOVING MOVING NORTHEAST AT 30 MILES_ AN HOUR. SHOWERS AND INTENSE THUNDERSTORMS WILL CONTINUE MOVING ACROSS NORTHERN AND EASTERN IOWA THROUGH 615 PM. JAK
Special weather statement, Mar 22, 5:51 PM CST, 20 minutes before
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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.