Alert archive / Iowa / Tornado Warnings in 1993

Tornado Warning 13, NWS Des Moines, IA

June 29, 1993Humboldt County, Pocahontas County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 29, 1993, 7:05 PM CDT for Humboldt County, Pocahontas County, Iowa. It was in force for 25 min.

The area

The counties it named.

The facts

Issued
Jun 29, 1993, 7:05 PM CDT (00:05 UTC)
Expired
Jun 29, 1993, 7:30 PM CDT
In force
25 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Humboldt County, IA, Pocahontas County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.1 hours before the alert went out and 225 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 1993-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3751 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 1993-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 111 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
3751 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1148 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
111 m²/s²
0-3 km storm-relative helicity
207 m²/s²
Significant tornado parameter
2.6
Supercell composite
16.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDSM 300005
TORDSM
IAC091-151-300030-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
705 PM CDT TUE JUN 29 1993
 
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  730 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION(S)S...
 
IN NORTH CENTRAL IOWA
 
   ...HUMBOLDT COUNTY
 
IN NORTHWEST IOWA
 
   ...EASTERN POCAHONTAS COUNTY
 
AT 701 PM CDT...NATIONAL WEATHER SERVICE RADAR SHOWED A SEVERE
THUNDERSTORM NEAR ROLFE...30 MILES NORTHEAST OF FORT DODGE. THIS STORM
HAD PRODUCED TWO BRIEF TORNADO TOUCHDOWNS AS IT MOVED THROUGH NORTHERN
POCAHONTAS COUNTY BETWEEN 640 AND 700 PM.
 
THIS STORM WAS MOVING SOUTHEAST AT 40 MILES AN HOUR...AND WILL
APPROACH RUTLAND AND HUMBOLDT BY 720 PM.  IF YOU ARE NEAR
BRADGATE...YOU SHOULD TAKE SHELTER IMMEDIATELY!
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING.  AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH
OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
 
SULLIVAN
&

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 7:18 PM CDTFlash Flood WarningDMXKossuth, Palo Alto, Pocahontas3 hr
Jun 29, 7:26 PM CDTSevere Thunderstorm WarningDMXWinnebago24 min
Jun 29, 7:27 PM CDTSevere Thunderstorm WarningDMXWebster33 min
Jun 29, 7:34 PM CDTSevere Thunderstorm WarningDMXHumboldt26 min
Jun 29, 8:01 PM CDTSevere Thunderstorm WarningDMXHamilton, Humboldt, Webster, Wright29 min
Jun 29, 8:17 PM CDTTornado WarningDMXCalhoun, Greene28 min
Jun 29, 8:23 PM CDTSevere Thunderstorm WarningDMXButler52 min
Jun 29, 8:38 PM CDTSevere Thunderstorm WarningDMXBoone37 min
Jun 29, 8:44 PM CDTSevere Thunderstorm WarningDMXBlack Hawk, Bremer, Grundy46 min
Jun 29, 8:44 PM CDTTornado WarningDMXCalhoun31 min
Jun 29, 8:50 PM CDTTornado WarningDMXBoone, Greene25 min
Jun 29, 8:53 PM CDTSevere Thunderstorm WarningDMXMarshall, Story52 min
Jun 29, 8:57 PM CDTTornado WarningDMXCrawford33 min
Jun 29, 9:01 PM CDTSevere Thunderstorm WarningDMXCarroll, Sac29 min
Jun 29, 9:20 PM CDTTornado WarningDMXJasper, Polk, Story25 min
Jun 29, 9:25 PM CDTSevere Thunderstorm WarningDMXBuchanan, Fayette65 min
Jun 29, 9:28 PM CDTSevere Thunderstorm WarningDMXBlack Hawk32 min
Jun 29, 9:36 PM CDTSevere Thunderstorm WarningDMXBenton, Tama54 min
Jun 29, 9:37 PM CDTSevere Thunderstorm WarningDMXDallas, Jasper, Polk68 min
Jun 29, 9:49 PM CDTSevere Thunderstorm WarningDMXMarshall26 min
Jun 29, 10:00 PM CDTTornado WarningDMXJasper, Polk26 min
Jun 29, 10:15 PM CDTFlash Flood WarningDMXBoone96 min
Jun 30, 12:21 AM CDTFlash Flood WarningDMXDecatur, Ringgold66 min
Jun 30, 3:01 PM CDTSevere Thunderstorm WarningDMXCass29 min

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.