Alert archive / Iowa / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 156, NWS Sioux Falls, SD

July 25, 2000Dickinson County, Lyon County, Osceola County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 25, 2000, 9:41 PM CDT for Dickinson County, Lyon County, Osceola County, Iowa. It was in force for 49 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 25, 2000, 9:41 PM CDT (02:41 UTC)
Expired: Jul 25, 2000, 10:30 PM CDT
In force: 49 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

Counties Dickinson County, IA, Lyon County, IA, Osceola County, IA

The radar

The Sioux Falls radar (KFSD), 89 km from the middle of the area, began a volume at 02:40 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.

What was reported inside it

Time	Report	Where	Remark
Jul 25, 9:57 PM CDT	Hail 1.75	Little Rock, IA	Large hail damaged vehicles, windows, and crops, but the amount of damage was not determined. The hail fell over most of the southern and eastern parts of Lyon County.
Jul 25, 10:15 PM CDT	Thunderstorm Wind 52 E	Wahpeton, IA	Thunderstorm winds caused tree damage, including large branches and a few trees down.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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, 2.7 hours before the alert went out and 232 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 260242
SVRFSD
IAC119-143-SDC083-260330-

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LYON COUNTY IN NORTHWEST IOWA
  OSCEOLA COUNTY IN NORTHWEST IOWA
  EASTERN LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 1030 PM CDT

* AT 941 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 6 MILES NORTH OF LITTLE ROCK TO 7
  MILES SOUTHWEST OF LARCHWOOD...OR FROM 14 MILES SOUTHWEST OF
  WORTHINGTON TO 8 MILES NORTH OF CANTON...MOVING SOUTHEAST AT 15
  MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  ROCK RAPIDS AROUND 950 PM CDT
  LITTLE ROCK...CANTON AROUND 955 PM CDT
  ALVORD AROUND 1005 PM CDT
  GEORGE...INWOOD...SIBLEY AROUND 1010 PM CDT
  DOON AROUND 1020 PM CDT
  ASHTON AROUND 1025 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.

What forecasters said that day

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

NWS Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 25, 9:25 PM CDT, 16 minutes earlier.

Area forecast discussion, Jul 25, 9:25 PM CDT, 16 minutes before

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
925 PM CDT TUE JUL 25 2000

TSTMS BLEW UP FM EXTRM ERN SD TO SWRN MN AHEAD OF FNT AND NOW ARE
JUST SE OF FSD MOVG INTO FAR NWRN IA. CURRENT ZONE SPLIT JUST FINE AND
UPDATED EARLIER FOR WIND SHIFT AND NO TSTMS TO NW OF FNT IN SERN SD.

.FSD...NONE
RYRHOLM

In the hours before

Special weather statement, Jul 25, 7:20 PM CDT, 2 hours 21 minutes before

SDZ040-055-056-061-062-260100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE  SIOUX FALLS SD
720 PM CDT TUE JUL 25 2000

...SEVERE THUNDERSTORM WATCH CANCELLED IN EASTERN SOUTH DAKOTA...

AT 725 PM THE SEVERE THUNDERSTORMS HAVE MOVED OVER INTO MINNESOTA
AND NO LONGER APPEAR TO BE A THREAT IN EASTERN SOUTH DAKOTA.

RSR

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, 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, 10:35 PM CDT	Severe Thunderstorm Warning	FSD	Osceola	25 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.