Alert archive / Iowa / Tornado Warnings in 1991
Tornado Warning 28, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Jul 17, 1991, 9:45 PM CDT for Howard County, Iowa. It was in force for 30 min.
The area
The counties it named.
The facts
- Issued
- Jul 17, 1991, 9:45 PM CDT (02:45 UTC)
- Expired
- Jul 17, 1991, 10:15 PM CDT
- In force
- 30 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Howard County, IA
The nearest sounding before it
Minneapolis, MN (KSTC), launched 00:00Z, 2.8 hours before the alert went out and 195 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
- 1083 J/kg
- Mixed-layer CIN
- -159 J/kg
- Mixed-layer LCL
- 1349 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KALO 180244 TORALO IAC089-180315- BULLETIN - EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE WATERLOO IA 945 PM CDT WED JUL 17 1991 THE NATIONAL WEATHER SERVICE IN WATERLOO HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 1015 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTHEAST IOWA ...HOWARD COUNTY AT 940 PM CDT A FUNNEL CLOUD WAS REPORTED 5 MILES SOUTH OF CHESTER OR 25 MILES WEST OF DECORAH. CITIES IN THE PATH OF THIS FUNNEL CLOUD ARE LIME SPRINGS AND CRESCO. NO MOVEMENT WAS REPORTED ON THIS TORNADO. DURING A TORNADO...THE SAFEST PLACE IS IN A BASEMENT. GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE. IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN I(NTERIOR ROOM SUCH AS A CLOSET ON THE LOWEST FLOOR. AVOID WINDOWS. COLLAR
What forecasters said that day
The local office's own words before this tornado 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, Jul 17, 5:18 PM CDT, 4 hours 27 minutes before
IAZ002-003-007-182315- SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR NORTHEAST IOWA NATIONAL WEATHER SERVICE WATERLOO IA 520 PM CDT WED JUL 17 1991 AT 515 PM CDT WEATHER RADAR FROM WATERLOO WAS SHOWING AN ISOLATED STRONG THUNDERSTORM 15 MILES NORTHWEST OF MASON CITY BETWEEN FOREST CITY AND LAKE MILLS. THIS STORM WAS NEWLY DEVELOPED AND MOVEMENT HAS YET TO BE DETERMINED. THIS STORM WILL LIKELY PRODUCE BRIEF HEAVY RAINS ...DEADLY LIGHTNING AND POSSIBLY SOME SMALL HAIL. OTHERWISE SKIES WERE PARTLY SUNNY WITH HOT AND HUMID CONDITIONS. TEMPERATURES WERE IN THE LOWER TO MIDDLE 90S WITH SOUTHWEST WINDS OF 10 TO 20 MILES AN HOUR. THROUGH 615 PM CDT SCATTERED THUNDERSTORMS WILL BE POSSIBLE ANYWHERE OVER THE AREA...HOWEVER THE BEST CHANCES APPEAR TO BE TO THE NORTH OF HIGHWAY 18. IT WILL CONTINUE HOT AND HUMID WITH TEMPERATURES IN THE 90S. COLLAR
Nearby
Tornado Warnings in Iowa, 1991Every tornado warning in 1991Tornadoes 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.