Alert archive / Iowa / Flash Flood Warnings in 1996

Flash Flood Warning 1, NWS Sioux Falls, SD

June 20, 1996Ida County, Iowa

NWS Sioux Falls, SD issued this flash flood warning at Jun 20, 1996, 1:26 AM CDT for Ida County, Iowa. It was in force for 3 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, 1:26 AM CDT (06:26 UTC)
Expired
Jun 20, 1996, 4:25 AM CDT
In force
3 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 06:28 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, 6.4 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 00:00Z on 1996-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3601 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 1996-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 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
3601 J/kg
Mixed-layer CIN
-70 J/kg
Mixed-layer LCL
1562 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
276 m²/s²
Significant tornado parameter
1.4
Supercell composite
19.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 200626
FFWFSD
IAC093-200925-

BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
126 AM CDT THU JUN 20 1996

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS SD HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 425 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...

IN NORTHWEST IOWA

   ...IDA COUNTY
 
AT 120 AM DOPPLER RADAR ESTIMATED RAINFALL OF MORE THAN 2.50 INCHES
IN THE PAST 3 HOURS OVER MUCH OF IDA COUNTY.  RADAR SHOWERD MORE
THUNDERSTORMS WHICH WILL LIKELY MOVE INTO IDA COUNTY TO PRODUCE
ADDITIONAL HEAVY RAINFALL UP TO AN INCH.

BATTLE CREEK AND THE MAPLE RIVER WILL MOST LIKELY EXPERIENCE FLOODING
WITH EXCESSIVE RAINFALL IN THIS BASIN.

DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!
 
IF FLASH FLOODING IS OBSERVED...ACT QUICKLY.  MOVE TO ESCAPE FLOOD
WATERS.  DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS
RISING.

GILLISPIE/CHAPMAN/HOLMES

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Local storm report, Jun 20, 1:19 AM CDT, 7 minutes before
PRELIMINARY LOCAL STORM REPORT...PART 1
NATIONAL WEATHER SERVICE  SIOUX FALLS SD
117 AM CDT THU JUN 20 1996

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0143 PM    ESMOND                    SD   0.75 INCH HAIL
06/19/96   KINGSBURY

0155 PM    ESMOND                    SD   0.75 INCH HAIL
06/19/96   KINGSBURY

0130 PM    13 SE HURON               SD   1.00 INCH HAIL
06/19/96   BEADLE

0235 PM    5 NE SINAI                SD   0.75 INCH HAIL
06/19/96   BROOKINGS

0258 PM    PICKSTOWN                 SD   1.75 INCH HAIL
06/19/96   CHARLES MIX

END

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, 8:32 AM CDTFlash Flood WarningFSDIda5 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.