Alert archive / Iowa / Severe Thunderstorm Warnings in 1992

Severe Thunderstorm Warning 93, NWS Des Moines, IA

September 5, 1992Marion County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Sep 5, 1992, 10:04 PM CDT for Marion County, Iowa. It was in force for 41 min.

The area

The counties it named.

The facts

Issued
Sep 5, 1992, 10:04 PM CDT (03:04 UTC)
Expired
Sep 5, 1992, 10:45 PM CDT
In force
41 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Marion County, IA

The nearest sounding before it

Omaha, NE (KOVN), launched 00:00Z, 3.1 hours before the alert went out and 273 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 00:00Z on 1992-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1632 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 1992-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 square meters per square second.19395878Sfc1 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
1632 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
797 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.6

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, Sep 5, 8:03 PM CDT, 2 hours 1 minute before
IAZ006>011-016>019-026>029-038>040-060400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WATERLOO IA
800 PM CDT SAT SEP 5 1992

...SCATTERED SHOWERS AND THUNDERSTORMS PRODUCING HEAVY RAINS AND
SOME MINOR FLOODING WILL CONTINUE ACROSS NORTHEAST IOWA...

SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS NORTHEAST
AND NORTH CENTRAL IOWA THROUGH THE LATE EVENING HOURS AND WILL PRODUCE
HEAVY RAINS IN ADDITION TO DEADLY LIGHTNING.  DUE TO THESE HEAVY RAIN
PRODUCING THUNDERSTORMS...THE TOWNS OF MASON CITY...OSAGE AND BRITT
HAVE REPORTED SOME MINOR STREET FLOODING IN THE LAST HOUR.

THESE SHOWERS AND THUNDERSTORMS WILL CONTINUE TO MOVE ACROSS NORTH
CENTRAL AND NORTHEAST IOWA AND WILL CONTINUE TO PRODUCE PERIODS OF
HEAVY RAINS AND POSSIBLY SOME FLOODING OF STREETS AND LOW-LYING AREAS.

TRS
Special weather statement, Sep 5, 8:18 PM CDT, 1 hour 46 minutes before
IAZALL-0602010

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
810 PM CDT SAT SEP 5 1992

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR A LARGE PORTION OF
   SOUTHWEST AND SOUTH CENTAL IOWA UNTIL 10 PM...

AT 808 PM...STRONG STORMS WERE LOCATED 25 MILES NORTHEAST OF AMES OR 10
MILES WEST OF ELDORA...AND 45 MILES SOUTHWEST OF DES MOINES NEAR
FONTANELLE. THESE STORMS ARE CAPABLE OF PRODUCING VERY HEAVY RAIN...
GUSTY WINDS...FREQUENT DEADLY LIGHTNING AND HAIL.

THESE STORMS WERE PART OF A LARGER AREA OF SCATTERED SHOWERS AND
THUNDERSTORMS WHICH CONTINUED ACROSS THE NORTHWEST HALF OF IOWA.

MOVEMENT WAS EAST AT 15 MILES AN HOUR.

R A PRENTICE
Special weather statement, Sep 5, 8:46 PM CDT, 1 hour 18 minutes before
IAZALL-060235

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
839 PM CDT SAT SEP 5 1992

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR A LARGE PORTION OF
   SOUTHWEST AND SOUTH CENTAL IOWA UNTIL 10 PM...

AT 831 PM...A STRONG THUNDERSTORM WAS LOCATED NEAR GREENFIELD.
THIS STORM IS CAPABLE OF PRODUCING VERY HEAVY RAIN...GUSTY WINDS...
FREQUENT DEADLY LIGHTNING AND HAIL.

THIS STORM WAS PART OF A LARGER AREA OF SCATTERED SHOWERS AND
THUNDERSTORMS WHICH CONTINUED ACROSS THE CENTRAL HALF OF IOWA. THIS AREA
WAS LOCATED WEST OF A LINE EXTENDING FROM NEAR DECORAH...TO 20 MILES
WEST OF WATERLOO...TO JUST SOUTH OF KNOXVILLE.

MOVEMENT WAS EAST AT 15 MILES AN HOUR.

R A PRENTICE
Special weather statement, Sep 5, 8:51 PM CDT, 1 hour 13 minutes before
IAZALL-060235

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY...CORRECTED
NATIONAL WEATHER SERVICE DES MOINES IA
839 PM CDT SAT SEP 5 1992

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR A LARGE PORTION OF
   SOUTHWEST AND SOUTH CENTAL IOWA UNTIL 10 PM...

AT 831 PM...A STRONG THUNDERSTORM WAS LOCATED 40 MILES SOUTHWEST OF DES
MOINES NEAR GREENFIELD. THIS STORM IS CAPABLE OF PRODUCING VERY HEAVY
RAIN...GUSTY WINDS...FREQUENT DEADLY LIGHTNING AND HAIL.

THIS STORM WAS PART OF A LARGER AREA OF SCATTERED SHOWERS AND
THUNDERSTORMS WHICH CONTINUED ACROSS THE CENTRAL HALF OF IOWA. THIS AREA
WAS LOCATED WEST OF A LINE EXTENDING FROM NEAR DECORAH...TO 20 MILES
WEST OF WATERLOO...TO JUST SOUTH OF KNOXVILLE.

MOVEMENT WAS EAST AT 15 MILES AN HOUR.

R A PRENTICE
Special weather statement, Sep 5, 9:15 PM CDT, 49 minutes before
IAZALL-060310

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
909 PM CDT SAT SEP 5 1992

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR A LARGE PORTION OF
   SOUTHWEST AND SOUTH CENTAL IOWA UNTIL 10 PM...

AT 905 PM...A STRONG THUNDERSTORM WAS LOCATED 35 MILES SOUTHWEST OF DES
MOINES OR 10 MILES SOUTHEAST OF GREENFIELD. THIS STORM IS CAPABLE OF
PRODUCING HEAVY RAIN...GUSTY WINDS...FREQUENT DEADLY LIGHTNING AND HAIL.

MOVEMENT WjAS SOUTHEAST AT 15 MILES AN HOUR.

R A PRENTICE
Special weather statement, Sep 5, 9:44 PM CDT, 20 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 5, 9:28 PM CDTSevere Thunderstorm WarningDMXUnion26 min
Sep 5, 10:04 PM CDTSevere Thunderstorm WarningDMXJasper35 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1992Every severe thunderstorm warning in 1992

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.