Alert archive / Iowa / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 45, NWS Des Moines, IA

May 14, 1991Boone County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 14, 1991, 9:03 AM CDT for Boone County, Iowa. It was in force for 42 min.

The area

The counties it named.

The facts

Issued
May 14, 1991, 9:03 AM CDT (14:03 UTC)
Expired
May 14, 1991, 9:45 AM CDT
In force
42 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Boone County, IA

The nearest sounding before it

Omaha, NE (KOVN), launched 12:00Z, 2.1 hours before the alert went out and 218 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.

Skew-T log-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 1991-05-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 1991-05-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -52 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
NaN m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-52 m²/s²
0-3 km storm-relative helicity
-3 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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, 9:02 AM CDT, 1 minute before
IAZALL-140540-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
8 55 AM CDT TUE MAY 14 1991

AT 8 45 AM...A NUMBER OF INTENSE THUNDERSTORMS WERE LOCATED IN CENTRAL
AND SOUTH CENTRAL IOWA.  THESE THUNDERSTORMS WERE LOCATED ALONG A LINE
ABOUT 15 MILES WIDE AND EXTENDING FROM JUST SOUTH OF BOONE...TO 10 MILES
SOUTH OF NEVADA...OR 30 MILES NORTHWEST THROUGH 20 MILES NORTH OF
DES MOINES. THESE STORMS WERE PRODUCING BRIEF VERY HEAVY RAIN...DANGEROUS
LIGHTNING...AND HAIL.

THE THUNDERSTORMS IN SOUTH CENTRAL IOWA WERE LOCATED JUST WEST OF CHARITON
...OR ABOUT 35 MILES SOUTHEAST OF DES MOINES.  VERY HEAVY RAIN AND HAIL
WAS ALSO REPORTED NEAR LUCAS.

THE PRECIPITATcION WAS MOVING EAST AT 15 MILES AN HOUR.

SCOTT

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 14, 8:33 AM CDTSevere Thunderstorm WarningDMXLucas42 min
May 14, 8:44 AM CDTSevere Thunderstorm WarningDMXJasper, Polk, Story46 min
May 14, 9:15 AM CDTSevere Thunderstorm WarningDMXLucas45 min
May 14, 9:43 AM CDTSevere Thunderstorm WarningDMXMarshall47 min
May 14, 10:00 AM CDTSevere Thunderstorm WarningDMXWayne45 min
May 14, 10:36 AM CDTSevere Thunderstorm WarningDMXGrundy69 min
May 14, 10:50 AM CDTSevere Thunderstorm WarningDMXWayne40 min
May 14, 11:05 AM CDTSevere Thunderstorm WarningDMXAppanoose40 min
May 14, 11:17 AM CDTSevere Thunderstorm WarningDMXBuchanan58 min
May 14, 11:26 AM CDTSevere Thunderstorm WarningDMXBlack Hawk64 min
May 14, 12:04 PM CDTSevere Thunderstorm WarningDMXFayette38 min
May 14, 12:34 PM CDTSevere Thunderstorm WarningDMXBlack Hawk41 min
May 14, 12:43 PM CDTSevere Thunderstorm WarningDMXBenton47 min
May 14, 1:01 PM CDTSevere Thunderstorm WarningDMXLinn44 min
May 14, 1:12 PM CDTSevere Thunderstorm WarningDMXBuchanan33 min
May 14, 1:30 PM CDTSevere Thunderstorm WarningDMXLinn45 min
May 14, 1:40 PM CDTTornado WarningDMXLinn35 min
May 14, 1:52 PM CDTSevere Thunderstorm WarningDMXBenton21 min
May 14, 2:24 PM CDTSevere Thunderstorm WarningDMXBenton66 min
May 14, 5:05 PM CDTSevere Thunderstorm WarningDMXWright40 min
May 14, 5:22 PM CDTSevere Thunderstorm WarningDMXCerro Gordo, Hancock68 min
May 14, 5:49 PM CDTSevere Thunderstorm WarningDMXWright41 min
May 14, 6:42 PM CDTSevere Thunderstorm WarningDMXPolk, Warren63 min
May 14, 6:56 PM CDTTornado WarningDMXPolk34 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.