Alert archive / Iowa / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 159, NWS Sioux Falls, SD

July 25, 2000Osceola County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 25, 2000, 10:35 PM CDT for Osceola County, Iowa. It was in force for 25 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: Jul 25, 2000, 10:35 PM CDT (03:35 UTC)
Expired: Jul 25, 2000, 11:00 PM CDT
In force: 25 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Osceola County, IA

The radar

The Sioux Falls radar (KFSD), 92 km from the middle of the area, began a volume at 03:39 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.

Issued	Product	Office	Lasted
Jul 25, 8:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.6 hours before the alert went out and 230 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1668 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1176 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFSD 260335
SVRFSD
IAC143-260400-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1035 PM CDT TUE JUL 25 2000

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  OSCEOLA COUNTY IN NORTHWEST IOWA

* UNTIL 1100 PM CDT

* AT 1035 PM CDT...A SEVERE THUNDERSTORM WAS REPORTED 3 MILES
  NORTHWEST OF MELVIN...OR ABOUT 22 MILES SOUTH OF WORTHINGTON...
  MOVING SOUTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MELVIN AROUND 1040 PM CDT

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN
EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 8:39 PM CDT	Tornado Warning	FSD	Osceola	51 min
Jul 25, 9:41 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson, Lyon, Osceola	49 min
Jul 25, 10:03 PM CDT	Severe Thunderstorm Warning	FSD	O'Brien, Sioux	42 min
Jul 25, 10:10 PM CDT	Tornado Warning	FSD	Dickinson	35 min
Jul 25, 10:17 PM CDT	Tornado Warning	FSD	Lyon, Sioux	43 min
Jul 25, 10:28 PM CDT	Tornado Warning	FSD	Clay	47 min
Jul 25, 10:51 PM CDT	Severe Thunderstorm Warning	FSD	O'Brien	24 min
Jul 25, 10:59 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	31 min
Jul 25, 11:18 PM CDT	Severe Thunderstorm Warning	FSD	O'Brien	27 min
Jul 25, 11:19 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista, Clay	26 min
Jul 25, 11:32 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee	28 min
Jul 25, 11:47 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista	43 min
Jul 25, 11:59 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee	31 min
Jul 26, 12:28 AM CDT	Severe Thunderstorm Warning	FSD	Buena Vista	32 min
Jul 26, 1:53 AM CDT	Severe Thunderstorm Warning	FSD	Clay	22 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2000 Every 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.