Alert archive / Iowa / Tornado Warnings in 1996

Tornado Warning 39, NWS Omaha, NE

June 20, 1996Fremont County, Iowa

NWS Omaha, NE issued this tornado warning at Jun 20, 1996, 9:55 PM CDT for Fremont County, Iowa. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 20, 1996, 9:55 PM CDT (02:55 UTC)
Expired
Jun 20, 1996, 10:30 PM CDT
In force
35 min
Issued by
NWS Omaha, NE
Area
Whole counties

County Fremont County, IA

The radar

The Omaha radar (KOAX), 90 km from the middle of the area, began a volume at 02:59 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.9 hours before the alert went out and 91 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 1996-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2363 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 1996-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 112 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
2363 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
1424 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
112 m²/s²
0-3 km storm-relative helicity
276 m²/s²
Significant tornado parameter
2.1
Supercell composite
19.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOMA 210300 COR
TOROMA
NEC053-210330-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
955 PM CDT THU JUN 20 1996

THE NATIONAL WEATHER SERVICE IN OMAHA/VALLEY HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL 1030 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...


IN EAST CENTRAL NEBRASKA

   ...DODGE COUNTY

AT 950 PM CDT WEATHER SERVICE RADAR SHOWED A TORNADIC THUNDERSTORM JUST
WEST OF FREMONT MOVING EAST AT 25 MPH. 64 |MPH WINDS WERE REPORTED AT
FREMONT.


IF YOU ARE CAUGHT IN THE OPEN...TRY TO HIDE IN A DEPRESSION SUCH AS
A DITCH OR CULVERT AND COVER YOUR HEAD WITH YOUR HANDS.  DO NOT
ATTEMPT TO OUTRUN THE TORNADO BY AUTO.

BYRD


&

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 8:16 PM CDTSevere Thunderstorm WarningOAXHarrison59 min
Jun 20, 9:43 PM CDTTornado WarningOAXHarrison47 min
Jun 21, 1:10 AM CDTSevere Thunderstorm WarningOAXMonona50 min
Jun 21, 2:39 AM CDTSevere Thunderstorm WarningOAXHarrison, Monona51 min
Jun 21, 3:32 AM CDTSevere Thunderstorm WarningOAXMonona28 min
Jun 21, 4:48 AM CDTFlash Flood WarningOAXMonona5 hr
Jun 21, 6:20 AM CDTFlash Flood WarningOAXHarrison, Shelby4 hr
Jun 21, 11:59 AM CDTFlash Flood WarningOAXHarrison6 hr
Jun 21, 4:11 PM CDTFlash Flood WarningOAXHarrison6 hr

Nearby

Tornado Warnings in Iowa, 1996Every tornado warning in 1996Tornadoes in 1996

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; radar from the NEXRAD Level II archive.