Alert archive / Iowa / Tornado Warnings in 1994

Tornado Warning 21, NWS Des Moines, IA

July 19, 1994Chickasaw County, Iowa

NWS Des Moines, IA issued this tornado warning at Jul 19, 1994, 8:22 PM CDT for Chickasaw County, Iowa. It was in force for 30 min.

The area

The counties it named.

The facts

Issued
Jul 19, 1994, 8:22 PM CDT (01:22 UTC)
Expired
Jul 19, 1994, 8:52 PM CDT
In force
30 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Chickasaw County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 1.4 hours before the alert went out and 224 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, Minneapolis, MN at 00:00Z on 1994-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 503 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 1994-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 14 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
503 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
682 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
343 m²/s²
Significant tornado parameter
0.8
Supercell composite
7.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KALO 200135 COR
TORALO
IAC037-200200-

BULLETIN - EBS ACTIVATION REQUESTED...CORRECTION
TORNADO WARNING
NATIONAL WEATHER SERVICE WATERLOO IA
822 PM CDT TUE JUL 19 1994

THE NATIONAL WEATHER SERVICE IN WATERLOO HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  900 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHEAST IOWA

   ...NORTHERN CHICKASAW COUNTY

AT 818 PM...SPOTTERS REPORTED A TORNADOS ON THE GROUND 2 MILES EAST OF
ALTA VISTA...AND 6 MILES NORTH OF NEW HAMTON BY STATE PATROL. THESE
STORMS ARE ASSUMED TO BE MOVING EAST AT 20 MILES AN HOUR. TOWNS AFFECTED
WILL BE JERICO...AND PROTIVIN.

TAKE COVER NOW.  THIS IS A DANGEROUS STORM.

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 INTERIOR ROOM SUCH AS A CLOSET ON
THE LOWEST FLOOR.  AVOID WINDOWS.




&

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 19, 8:27 PM CDTTornado WarningDMXHoward18 min
Jul 19, 8:32 PM CDTTornado WarningDMXCerro Gordo28 min
Jul 19, 8:47 PM CDTTornado WarningDMXHoward28 min
Jul 19, 9:38 PM CDTSevere Thunderstorm WarningDMXWinneshiek52 min
Jul 19, 10:15 PM CDTSevere Thunderstorm WarningDMXAllamakee30 min
Jul 19, 10:27 PM CDTTornado WarningDMXAllamakee37 min
Jul 20, 1:29 AM CDTSevere Thunderstorm WarningDMXJohnson, Linn31 min
Jul 20, 1:52 AM CDTSevere Thunderstorm WarningDMXJohnson23 min

Nearby

Tornado Warnings in Iowa, 1994Every tornado warning in 1994Tornadoes in 1994

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.