Alert archive / Iowa / Flash Flood Warnings in 1996

Flash Flood Warning 2, NWS Sioux Falls, SD

June 20, 1996Ida County, Iowa

NWS Sioux Falls, SD issued this flash flood warning at Jun 20, 1996, 8:32 AM CDT for Ida County, Iowa. It was in force for 5 hr. 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, 8:32 AM CDT (13:32 UTC)
Expired
Jun 20, 1996, 1:30 PM CDT
In force
5 hr
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Ida County, IA

The radar

The Omaha radar (KOAX), 138 km from the middle of the area, began a volume at 13:32 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 12:00Z, 1.5 hours before the alert went out and 138 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 12:00Z on 1996-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2885 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 12:00Z on 1996-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 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
2885 J/kg
Mixed-layer CIN
-108 J/kg
Mixed-layer LCL
717 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
147 m²/s²
Significant tornado parameter
0.0
Supercell composite
10.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 201338 COR
FFWFSD
IAC093-201830-

BULLETIN - EAS ACTIVATION REQUESTED...CORRECTION FOR TYPOS
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
832 AM CDT THU JUN 20 1996

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  130 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWEST IOWA

   ...IDA COUNTY

AT 830 AM CDT RADAR INDICATED AN THAT AREA OF THUNDERSTORMS WITH VERY
HEAVY RAINS WAS MOVING INTO IDA COUNTY. THESE HEAVY RAINS COMBINED WITH
HEAVY RAINS THAT FELL LAST NIGHT WILL CAUSE FLASH FLOODING ESPECIALLY
ALONG RIVERS AND CREEKS.

A FLASH FLOOD WARNING MEANS FLASH FLOODING IS OCCURING OR IS
IMMINENT. ACT QUICKLY TO SAVE YOURSELF. GET OUT OF LOW AREAS
SUBJECT TO FLOODING. AVOID ALREADY FLOODED AREAS. CAMPERS ALONG
STREAMS AND SMALL RIVERS SHOULD MOVE TO HIGHER GROUND.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO A$LLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.

CJ

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 19, 7:05 PM CDTSevere Thunderstorm WarningFSDOsceola45 min
Jun 19, 7:44 PM CDTSevere Thunderstorm WarningFSDSioux31 min
Jun 19, 8:16 PM CDTSevere Thunderstorm WarningFSDSioux44 min
Jun 19, 9:00 PM CDTSevere Thunderstorm WarningFSDO'Brien, Sioux35 min
Jun 19, 9:18 PM CDTSevere Thunderstorm WarningFSDPlymouth32 min
Jun 19, 9:26 PM CDTSevere Thunderstorm WarningFSDCherokee44 min
Jun 19, 9:49 PM CDTSevere Thunderstorm WarningFSDWoodbury31 min
Jun 19, 9:50 PM CDTSevere Thunderstorm WarningFSDPlymouth35 min
Jun 19, 10:09 PM CDTSevere Thunderstorm WarningFSDCherokee, Ida31 min
Jun 19, 10:22 PM CDTSevere Thunderstorm WarningFSDIda, Woodbury33 min
Jun 19, 10:54 PM CDTSevere Thunderstorm WarningFSDIda31 min
Jun 19, 11:19 PM CDTSevere Thunderstorm WarningFSDIda, Woodbury31 min
Jun 19, 11:50 PM CDTSevere Thunderstorm WarningFSDPlymouth30 min
Jun 20, 12:04 AM CDTSevere Thunderstorm WarningFSDWoodbury46 min
Jun 20, 12:20 AM CDTSevere Thunderstorm WarningFSDPlymouth15 min
Jun 20, 12:52 AM CDTSevere Thunderstorm WarningFSDWoodbury23 min
Jun 20, 1:26 AM CDTFlash Flood WarningFSDIda3 hr
Jun 20, 2:13 PM CDTSevere Thunderstorm WarningFSDWoodbury32 min
Jun 20, 2:24 PM CDTSevere Thunderstorm WarningFSDDickinson46 min
Jun 20, 2:45 PM CDTSevere Thunderstorm WarningFSDWoodbury30 min
Jun 20, 3:04 PM CDTSevere Thunderstorm WarningFSDPlymouth46 min
Jun 20, 3:18 PM CDTSevere Thunderstorm WarningFSDWoodbury47 min
Jun 20, 3:51 PM CDTSevere Thunderstorm WarningFSDPlymouth34 min
Jun 20, 3:55 PM CDTSevere Thunderstorm WarningFSDCherokee35 min
Jun 20, 4:37 PM CDTSevere Thunderstorm WarningFSDWoodbury33 min
Jun 20, 6:09 PM CDTSevere Thunderstorm WarningFSDCherokee, Ida31 min

Nearby

Flash Flood Warnings in Iowa, 1996Every flash flood warning 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.