Alert archive / Iowa / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 232, NWS Sioux Falls, SD

August 7, 2000Plymouth County, Iowa; Union County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 7, 2000, 11:47 PM CDT for Plymouth County, Iowa; Union County, South Dakota. It was in force for 28 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
Aug 7, 2000, 11:47 PM CDT (04:47 UTC)
Expired
Aug 8, 2000, 12:15 AM CDT
In force
28 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

Counties Plymouth County, IA, Union County, SD

The radar

The Sioux Falls radar (KFSD), 92 km from the middle of the area, began a volume at 04:49 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 7, 6:45 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.8 hours before the alert went out and 163 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 2000-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3267 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 2000-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 69 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
3267 J/kg
Mixed-layer CIN
-74 J/kg
Mixed-layer LCL
1579 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
69 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.8

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFSD 080449
SVRFSD
IAC149-SDC127-080515-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1147 PM CDT MON AUG 7 2000

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  PLYMOUTH COUNTY IN NORTHWEST IOWA
  UNION COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 1215 AM CDT

* AT 1147 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER JEFFERSON...OR ABOUT 7 MILES EAST OF   
PONCA...MOVING EAST AT 35 MPH.  ANOTHER SEVERE THUNDERSTORM WAS LOCATED
10 MILES EAST OF VERMILLION...OR 10 MILES NORTH OF ELK POINT...ALSO 
MOVING EAST AT 35 MPH.

* THE SEVERE THUrNDERSTORMS WILL BE NEAR...
  AKRON AND HINTON AROUND 1205 AM CDT

THIS STORM WILL PRODUCE LARGE HAIL. GO INSIDE A STURDY BUILDING AND
STAY AWAY FROM WINDOWS.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 7:41 PM CDTSevere Thunderstorm WarningFSDLyon34 min
Aug 7, 8:13 PM CDTSevere Thunderstorm WarningFSDO'Brien, Sioux47 min
Aug 7, 9:10 PM CDTSevere Thunderstorm WarningFSDLyon35 min
Aug 7, 9:57 PM CDTSevere Thunderstorm WarningFSDPlymouth, Sioux33 min
Aug 7, 10:29 PM CDTSevere Thunderstorm WarningFSDPlymouth31 min
Aug 7, 10:44 PM CDTSevere Thunderstorm WarningFSDClay, O'Brien31 min
Aug 7, 10:59 PM CDTSevere Thunderstorm WarningFSDSioux16 min
Aug 8, 12:18 AM CDTSevere Thunderstorm WarningFSDPlymouth27 min
Aug 8, 12:46 AM CDTSevere Thunderstorm WarningFSDCherokee, Plymouth29 min
Aug 8, 1:03 AM CDTSevere Thunderstorm WarningFSDSioux42 min
Aug 8, 1:16 AM CDTSevere Thunderstorm WarningFSDBuena Vista, Cherokee44 min
Aug 8, 1:45 AM CDTSevere Thunderstorm WarningFSDSioux30 min
Aug 8, 2:05 AM CDTSevere Thunderstorm WarningFSDO'Brien40 min
Aug 8, 2:32 AM CDTSevere Thunderstorm WarningFSDCherokee28 min
Aug 8, 2:41 AM CDTSevere Thunderstorm WarningFSDBuena Vista, Clay34 min
Aug 7, 7:01 PM CDTSevere Thunderstorm WarningFSDCharles Mix, Douglas29 min
Aug 7, 7:01 PM CDTSevere Thunderstorm WarningFSDLincoln, Minnehaha, Turner44 min
Aug 7, 7:01 PM CDTSevere Thunderstorm WarningFSDMcCook44 min
Aug 7, 7:09 PM CDTTornado WarningFSDDavison36 min
Aug 7, 7:12 PM CDTSevere Thunderstorm WarningFSDHutchinson33 min
Aug 7, 7:26 PM CDTSevere Thunderstorm WarningFSDLake34 min
Aug 7, 7:29 PM CDTSevere Thunderstorm WarningFSDMoody31 min
Aug 7, 7:42 PM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix48 min
Aug 7, 7:48 PM CDTSevere Thunderstorm WarningFSDHutchinson42 min
Aug 7, 8:32 PM CDTTornado WarningFSDBon Homme, Yankton28 min
Aug 7, 8:42 PM CDTSevere Thunderstorm WarningFSDCharles Mix33 min
Aug 7, 11:18 PM CDTSevere Thunderstorm WarningFSDUnion27 min
Aug 7, 11:28 PM CDTSevere Thunderstorm WarningFSDClay32 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2000Severe Thunderstorm Warnings in South Dakota, 2000Every severe thunderstorm warning in 2000

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.