Alert archive / Iowa / Flash Flood Warnings in 1998

Flash Flood Warning 2, NWS Sioux Falls, SD

June 24, 1998Woodbury County, Iowa

NWS Sioux Falls, SD issued this flash flood warning at Jun 24, 1998, 1:35 AM CDT for Woodbury 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 24, 1998, 1:35 AM CDT (06:35 UTC)
Expired
Jun 24, 1998, 6:05 AM CDT
In force
5 hr
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Woodbury County, IA

The radar

The Omaha radar (KOAX), 122 km from the middle of the area, began a volume at 06:42 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

Minneapolis, MN (KMPX), launched 00:00Z, 6.6 hours before the alert went out and 337 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 1998-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 901 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, Minneapolis, MN at 00:00Z on 1998-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 212 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
901 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
1105 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
212 m²/s²
0-3 km storm-relative helicity
335 m²/s²
Significant tornado parameter
1.4
Supercell composite
8.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 240636
FFWFSD
IAC193-241105-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
135 AM CDT WED JUN 24 1998

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN WOODBURY COUNTY IN NORTHWESTERN IOWA

* UNTIL 605 AM CDT

* VERY HEAVY RAINS TUESDAY EVENING HAVE CAUSE RAPID RISES IN SOME SMALL
  STREAMS IN SOUTHERN WOODBURY COUNTY. 

* WOLF CREEK JUST EAST OF HOLLY SPRINGS...3 NORTH OF HORNICK... HAS
  LEFT ITS BANKS AND WAS OVER  HIGHWAY 982 FORCING THE ROAD TO BE 
  CLOSED. MANY FIELDS IN THE AREA  WERE REPORTED FLOODED BY THE
  EMERGENCY MANAGEMENT OFFICE. THE CONTINUING RUNOFF FROM THE FIELDS AND
  WATER MOVING DOWN STREAM WILL KEEP WATER LEVELS HIGH TO RISING UNTIL
  LATER THIS WEDNESDAY MORNING. 

  DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!

WB

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 23, 7:19 PM CDTTornado WarningFSDWoodbury31 min
Jun 23, 7:50 PM CDTTornado WarningFSDWoodbury35 min
Jun 23, 8:16 PM CDTTornado WarningFSDWoodbury34 min
Jun 23, 8:18 PM CDTSevere Thunderstorm WarningFSDBuena Vista32 min
Jun 23, 8:23 PM CDTTornado WarningFSDPlymouth32 min
Jun 23, 8:39 PM CDTTornado WarningFSDSioux31 min
Jun 23, 8:51 PM CDTSevere Thunderstorm WarningFSDWoodbury34 min
Jun 23, 9:20 PM CDTSevere Thunderstorm WarningFSDBuena Vista50 min
Jun 23, 9:55 PM CDTFlash Flood WarningFSDWoodbury3 hr

Nearby

Flash Flood Warnings in Iowa, 1998Every flash flood warning in 1998

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.