Alert archive / Iowa / Tornado Warnings in 1993

Tornado Warning 24, NWS Des Moines, IA

July 8, 1993Boone County, Dallas County, Iowa

NWS Des Moines, IA issued this tornado warning at Jul 8, 1993, 9:52 PM CDT for Boone County, Dallas County, Iowa. It was in force for 38 min.

The area

The counties it named.

The facts

Issued
Jul 8, 1993, 9:52 PM CDT (02:52 UTC)
Expired
Jul 8, 1993, 10:30 PM CDT
In force
38 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Boone County, IA, Dallas County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.9 hours before the alert went out and 207 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 1993-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3257 joules per kilogram.LCLEL10008507005003002001001 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 1993-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 244 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
3257 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
692 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
244 m²/s²
0-3 km storm-relative helicity
341 m²/s²
Significant tornado parameter
6.3
Supercell composite
27.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KDSM 090252
TORDSM
IAC015-049-090330-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
952 PM CDT THU JUL 8 1993
 
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL 1030 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION(S)S...
 
IN CENTRAL IOWA
 
   ...SOUTHERN BOONE COUNTY...DALLAS COUNTY
 
AT 948 PM CDT...A TORNADO WAS REPORTED ON THE GOUND NEAR BOUTON. BOUNDEN
IS ABOUT 25 MILES NORTHWEST OF DES MOINES. RADAR CONFIRMS THIS TORNADO.
PEOPLE IN BOUTON...WOODWARD AND MADRID SHOULD TAKE COVER NOW!
 
R A PRENTICE
 
 
THIS IS A DANGEROUS STORM SITUATION.  ACT QUICKLY.  IF YOU ARE
IN THE PATH OF THIS TORNADO MOVE TO A SHELTER BELOW G@ROUND IF
AVAILABLE.  OTHERWISE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST
FLOOR POSSIBLE.  AVOID WINDOWS.  ABANDON CARS AND MOBILE HOMES
FOR A REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.
 
 
 
&

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 8, 9:05 PM CDT, 47 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038-
039-040-090315-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WATERLOO IA
905 PM CDT THU JUL 8 1993

...THUNDERSTORMS CONTINUE TO DUMP HEAVY RAIN ACROSS NORTH CENTRAL
AND NORTHEAST IOWA...

AT 900 PM...STRONG THUNDERSTORMS WERE PRODUCING VERY HEAVY RAINS ALONG
WITH WINDS NEAR 45 MILES AN HOUR.  THESE THUNDERSTORMS WERE LOCATED
FROM AROUND HAMPTON TO MARBLE ROCK AND SUMNER...ABOUT 35 MILES WEST OF
WATERLOO AND 25 MILES NORTH.  THIS RAIN COULD CAUSE SOME SMALL STREAMS
AND POSSIBLE LOW LAND FLOODING IN THE CEDAR AND WAPSIPINICON RIVER
BASIN.

TOWNS EFFECTED BY THESE THUNDERSTORMS BETWEEN 910 PM AND 10 PM WILL BE
NEW HAMPTON...NASHUA...FREDERICKSBURG AND ALPHA AS THEY MOVE NORTHEAST
AT 25 MILES AN HOUR.
THIS RAIN SITUATION SHOULD BE WATCHED CLOSELY.  THE GROUND IS
SATURATED AND STREAMS ARE ALREADY HIGHER THAN NORMAL.  IF DRIVING
TONIGHT DO NOT CROSS FLOODED ROADWAYS AND BE PREPARED TO MOVE TO
HIGHER GROUND IF FLOODING STARTS TO OCCUR.  STAY TUNED TO RADIO
...NOAA WEATHER RADIO AND TV FOR LATER WEATHER STATEMENTS AS A
SEVERE THUNDERSTORM WATCH REMAIN IN EFFECT UNTIL MIDNIGHT FOR
MUCH OF NORTH CENTRAL AND NORTHEAST IOWA ALONG AND WEST OF HIGHWAY
63.

RR
Special weather statement, Jul 8, 9:08 PM CDT, 44 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038-
039-040-090315-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WATERLOO IA
905 PM CDT THU JUL 8 1993

...THUNDERSTORMS CONTINUE TO DUMP HEAVY RAIN ACROSS NORTH CENTRAL
AND NORTHEAST IOWA...

AT 900 PM...STRONG THUNDERSTORMS WERE PRODUCING VERY HEAVY RAINS ALONG
WITH WINDS NEAR 45 MILES AN HOUR.  THESE THUNDERSTORMS WERE LOCATED
FROM AROUND HAMPTON TO MARBLE ROCK AND SUMNER...ABOUT 35 MILES WEST OF
WATERLOO AND 25 MILES NORTH.  THIS RAIN COULD CAUSE SOME SMALL STREAMS
AND POSSIBLE LOW LAND FLOODING IN THE CEDAR AND WAPSIPINICON RIVER
BASIN.

TOWNS EFFECTED BY THESE THUNDERSTORMS BETWEEN 910 PM AND 10 PM WILL BE
NEW HAMPTON...NASHUA...FREDERICKSBURG AND ALPHA AS THEY MOVE NORTHEAST
AT 25 MILES AN HOUR.
THIS RAIN SITUATION SHOULD BE WATCHED CLOSELY.  THE GROUND IS
SATURATED AND STREAMS ARE ALREADY HIGHER THAN NORMAL.  IF DRIVING
TONIGHT DO NOT CROSS FLOODED ROADWAYS AND BE PREPARED TO MOVE TO
HIGHER GROUND IF FLOODING STARTS TO OCCUR.  STAY TUNED TO RADIO
...NOAA WEATHER RADIO AND TV FOR LATER WEATHER STATEMENTS AS A
SEVERE THUNDERSTORM WATCH REMAIN IN EFFECT UNTIL MIDNIGHT FOR
MUCH OF NORTH CENTRAL AND NORTHEAST IOWA ALONG AND WEST OF HIGHWAY
63.

RR
Special weather statement, Jul 8, 9:12 PM CDT, 40 minutes before
IAZ043>050-056>061-070-090300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
912 PM CDT THU JUL 8 1993

THE FOLLOWING COUNTIES IN IOWA WILL REMAIN UNDER SEVERE THUNDERSTORM
WATCH NUMBER 621 UNTIL 930 PM CDT.  AFTER WHICH...THE COUNTIES WILL
BE UNDER TORNADO WATCH 623 WHICH BEGINS AT 930 PM AND CONTINUES UNTIL
400 AM CDT FRIDAY...JULY 9:

MONONA             CRAWFORD            CARROLL            GREENE
BOONE              STORY               MARSHALL           TAMA
HARRISON           SHELBY              AUDUBON            GUTHRIE
DALLAS             POLK                JASPER
POTTAWATTAMIE      CASS                MILLS

END/CHB
Special weather statement, Jul 8, 9:12 PM CDT, 40 minutes before
IAZ043>050-056>061-070-090300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
912 PM CDT THU JUL 8 1993

THE FOLLOWING COUNTIES IN IOWA WILL REMAIN UNDER SEVERE THUNDERSTORM
WATCH NUMBER 621 UNTIL 930 PM CDT.  AFTER WHICH...THE COUNTIES WILL
BE UNDER TORNADO WATCH 623 WHICH BEGINS AT 930 PM AND CONTINUES UNTIL
400 AM CDT FRIDAY...JULY 9:

MONONA             CRAWFORD            CARROLL            GREENE
BOONE              STORY               MARSHALL           TAMA
HARRISON           SHELBY              AUDUBON            GUTHRIE
DALLAS             POLK                JASPER
POTTAWATTAMIE      CASS                MILLS

END/CHB
Special weather statement, Jul 8, 9:43 PM CDT, 9 minutes before
IAZALL-090345-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
943 PM CDT THU JUL 8 1993

...A TORNADO WATCH IS IN EFFECT FOR MUCH OF SOUTHERN IOWA UNTIL
   4 AM FRIDAY...
...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PART OF THE NORTH
   HALF OF IOWA UNTIL MIDNIGHT...

AT 930 PM CDT...A LINE OF VERY STRONG THUNDERSTORMS CONTINUED FROM WEST
CENTRAL INTO NORTH CENTRAL IOWA.  THE STORMS WERE IN A 20 MILE WIDE BAND
EXTENDING FROM 50 MILES NORTHEAST OF COUNCIL BLUFFS NEAR AUDUBON...TO
45 MILES NORTH OF DES MOINES NEAR JEWELL.  OTHER VERY STRONG STORMS WERE
OCCURRING FROM 25 MILES SOUTHWEST TO 25 MILES NORTH OF WATERLOO...OR
FROM NEAR GRUNDY CENTER TO NASHUA.  THESE STORMS WERE PRODUCING
TORRENTIAL RAINFALL...GUSTY WINDS AND HAIL.

THE STORMS WERE PART OF AN AREA OF STORMS AND SHOWERS LOCATED GENERALLY
NORTH OF A LINE FROM COUNCIL BLUFFS TO DUBUQUE.
/
THE STORMS AND SHOWERS WERE MOVING EAST AT AROUND 35 MILES AN HOUR.

KALLMAN
Special weather statement, Jul 8, 9:44 PM CDT, 8 minutes before
IAZALL-090345-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
943 PM CDT THU JUL 8 1993

...A TORNADO WATCH IS IN EFFECT FOR MUCH OF SOUTHERN IOWA UNTIL
   4 AM FRIDAY...
...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PART OF THE NORTH
   HALF OF IOWA UNTIL MIDNIGHT...

AT 930 PM CDT...A LINE OF VERY STRONG THUNDERSTORMS CONTINUED FROM WEST
CENTRAL INTO NORTH CENTRAL IOWA.  THE STORMS WERE IN A 20 MILE WIDE BAND
EXTENDING FROM 50 MILES NORTHEAST OF COUNCIL BLUFFS NEAR AUDUBON...TO
45 MILES NORTH OF DES MOINES NEAR JEWELL.  OTHER VERY STRONG STORMS WERE
OCCURRING FROM 25 MILES SOUTHWEST TO 25 MILES NORTH OF WATERLOO...OR
FROM NEAR GRUNDY CENTER TO NASHUA.  THESE STORMS WERE PRODUCING
TORRENTIAL RAINFALL...GUSTY WINDS AND HAIL.

THE STORMS WERE PART OF AN AREA OF STORMS AND SHOWERS LOCATED GENERALLY
NORTH OF A LINE FROM COUNCIL BLUFFS TO DUBUQUE.
/
THE STORMS AND SHOWERS WERE MOVING EAST AT AROUN*D 35 MILES AN HOUR.

KALLMAN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 8, 7:12 PM CDTSevere Thunderstorm WarningDMXCrawford43 min
Jul 8, 7:12 PM CDTSevere Thunderstorm WarningDMXCarroll48 min
Jul 8, 8:05 PM CDTSevere Thunderstorm WarningDMXCarroll, Greene, Guthrie55 min
Jul 8, 8:27 PM CDTFlash Flood WarningDMXCarroll, Crawford, Greene4 hr
Jul 8, 8:57 PM CDTTornado WarningDMXCarroll, Crawford19 min
Jul 8, 9:09 PM CDTTornado WarningDMXBoone36 min
Jul 8, 9:29 PM CDTFlash Flood WarningDMXBoone, Story4 hr
Jul 8, 9:29 PM CDTFlash Flood WarningDMXDallas, Guthrie4 hr
Jul 8, 9:31 PM CDTTornado WarningDMXChickasaw29 min
Jul 8, 10:03 PM CDTTornado WarningDMXDallas, Polk27 min
Jul 8, 10:47 PM CDTFlash Flood WarningDMXBlack Hawk3 hr
Jul 8, 10:52 PM CDTSevere Thunderstorm WarningDMXBuchanan20 min
Jul 8, 11:25 PM CDTFlash Flood WarningDMXJasper, Polk5 hr
Jul 8, 11:25 PM CDTFlash Flood WarningDMXMarshall5 hr
Jul 8, 11:40 PM CDTSevere Thunderstorm WarningDMXAudubon, Carroll, Crawford35 min
Jul 8, 11:40 PM CDTSevere Thunderstorm WarningDMXAdams, Cass, Taylor35 min
Jul 8, 11:49 PM CDTFlash Flood WarningDMXBuchanan3 hr
Jul 9, 12:02 AM CDTSevere Thunderstorm WarningDMXAdair, Ringgold, Union28 min
Jul 9, 12:02 AM CDTSevere Thunderstorm WarningDMXGreene, Guthrie28 min
Jul 9, 12:22 AM CDTFlash Flood WarningDMXCarroll, Greene4 hr
Jul 9, 12:22 AM CDTFlash Flood WarningDMXAudubon4 hr
Jul 9, 12:33 AM CDTSevere Thunderstorm WarningDMXDallas, Madison, Polk, Warren27 min
Jul 9, 12:33 AM CDTSevere Thunderstorm WarningDMXClarke, Decatur27 min
Jul 9, 1:01 AM CDTFlash Flood WarningDMXBlack Hawk119 min
Jul 9, 1:05 AM CDTSevere Thunderstorm WarningDMXClarke, Decatur, Lucas, Wayne25 min
Jul 9, 1:05 AM CDTSevere Thunderstorm WarningDMXJasper, Marion, Polk25 min
Jul 9, 1:05 AM CDTSevere Thunderstorm WarningDMXWarren25 min
Jul 9, 1:22 AM CDTSevere Thunderstorm WarningDMXBlack Hawk23 min
Jul 9, 1:36 AM CDTSevere Thunderstorm WarningDMXMahaska, Poweshiek54 min
Jul 9, 1:36 AM CDTSevere Thunderstorm WarningDMXAppanoose, Davis, Monroe, Wapello54 min
Jul 9, 1:36 AM CDTSevere Thunderstorm WarningDMXJasper49 min
Jul 9, 2:11 AM CDTSevere Thunderstorm WarningDMXJefferson, Keokuk, Van Buren, Washington49 min
Jul 9, 2:11 AM CDTSevere Thunderstorm WarningDMXIowa, Johnson49 min
Jul 9, 10:21 AM CDTFlash Flood WarningDMXStory6 hr

Nearby

Tornado Warnings in Iowa, 1993Every tornado warning in 1993Tornadoes in 1993

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.