Alert archive / Iowa / Tornado Warnings in 2008
Tornado Warning 9, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at May 1, 2008, 7:39 PM CDT for Nobles County, Minnesota; Lyon County, O'Brien County, Osceola County, Iowa. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 1, 2008, 7:39 PM CDT (00:39 UTC)
- Expired
- May 1, 2008, 8:15 PM CDT
- In force
- 36 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
Counties Lyon County, IA, O'Brien County, IA, Osceola County, IA, Nobles County, MN
The radar
The Sioux Falls radar (KFSD), 80 km from the middle of the area, began a volume at 00:42 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 1, 4:34 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.7 hours before the alert went out and 231 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1405 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -36 m²/s²
- 0-3 km storm-relative helicity
- 10 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WFUS53 KFSD 020040
TORFSD
IAC119-141-143-MNC105-020115-
/O.NEW.KFSD.TO.W.0009.080502T0039Z-080502T0115Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
739 PM CDT THU MAY 1 2008
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* TORNADO WARNING FOR...
EXTREME EASTERN LYON COUNTY IN NORTHWEST IOWA
NORTHWESTERN OBRIEN COUNTY IN NORTHWEST IOWA
WESTERN OSCEOLA COUNTY IN NORTHWEST IOWA
SOUTHERN NOBLES COUNTY IN SOUTHWEST MINNESOTA
* UNTIL 815 PM CDT
* AT 739 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A DEVELOPING SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
NEAR ASHTON...OR 20 MILES SOUTHEAST OF ROCK RAPIDS...MOVING NORTH
AT 35 MPH.
* THE TORNADO WILL BE NEAR...
SIBLEY...LITTLE ROCK AROUND 750 PM CDT...
BIGELOW AROUND 805 PM CDT...
RUSHMORE AROUND 810 PM CDT...
WORTHINGTON AROUND 815 PM CDT...
THESE STORMS HAVE A HISTORY OF PRODUCING TORNADOES RAPIDLY.
THIS IS AN EXTREMELY DANGEROUS AND LIFE THREATENING SITUATION. TAKE
COVER NOW.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT THURSDAY EVENING
FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND SOUTHEASTERN SOUTH
DAKOTA.
LAT...LON 4312 9566 4322 9587 4326 9587 4327 9596
4355 9595 4368 9589 4363 9547
TIME...MOT...LOC 0039Z 197DEG 38KT 4329 9582
$$
SCHUMACHER1 follow-up statement
000
WWUS53 KFSD 020103
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
803 PM CDT THU MAY 1 2008
IAC119-141-143-MNC105-020115-
/O.CON.KFSD.TO.W.0009.000000T0000Z-080502T0115Z/
OSCEOLA IA-LYON IA-OBRIEN IA-NOBLES MN-
803 PM CDT THU MAY 1 2008
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR SOUTHERN
NOBLES...NORTHWESTERN OBRIEN...EASTERN LYON AND WESTERN OSCEOLA
COUNTIES...
AT 803 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF TORNADO PRODUCING STORMS. THESE TORNADO PRODUCING
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 5 MILES WEST OF
ASHTON TO 6 MILES WEST OF SANBORN...OR ALONG A LINE EXTENDING FROM 16
MILES SOUTHEAST OF ROCK RAPIDS TO 21 MILES NORTHEAST OF ORANGE
CITY...MOVING NORTH AT 21 MPH.
TORNADO PRODUCING STORMS WILL BE NEAR...
LITTLE ROCK AROUND 810 PM CDT...
ASHTON...SIBLEY AROUND 815 PM CDT...
THIS IS AN EXTREMELY DANGEROUS AND LIFE THREATENING SITUATION. TAKE
COVER NOW.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT THURSDAY EVENING
FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND SOUTHEASTERN SOUTH
DAKOTA.
LAT...LON 4312 9566 4322 9587 4326 9587 4327 9596
4355 9595 4368 9589 4363 9547
TIME...MOT...LOC 0103Z 181DEG 18KT 4333 9590 4323 9576
$$
PSThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 7:22 PM CDT | Tornado Warning | FSD | Nobles, Rock | 23 min |
| May 1, 7:45 PM CDT | Tornado Warning | FSD | Nobles, Rock | 30 min |
| May 1, 7:58 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Lyon | 26 min |
| May 1, 8:16 PM CDT | Tornado Warning | FSD | Nobles | 29 min |
| May 2, 3:49 PM CDT | Wind Advisory | FSD | Cottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 2 more | 12 hr |
| May 2, 2:48 PM CDT | River Flood Warning | FSD | Plymouth | 18 hr |
| May 2, 2:48 PM CDT | River Flood Warning | FSD | Clay, Dickinson | 7 days |
| May 2, 2:48 PM CDT | River Flood Warning | FSD | Buena Vista | 7 days |
| May 2, 2:48 PM CDT | River Flood Warning | FSD | Sioux | 18 hr |
Nearby
Tornado Warnings in Iowa, 2008Tornado Warnings in Minnesota, 2008Every tornado warning in 2008Tornadoes in 2008
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.