Alert archive / Iowa / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 12, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 10, 2001, 6:00 PM CDT for 4 counties in Iowa. It was in force for 30 min. 1 report came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- Apr 10, 2001, 6:00 PM CDT (23:00 UTC)
- Expired
- Apr 10, 2001, 6:30 PM CDT
- In force
- 30 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Clay County, IA, Dickinson County, IA, O'Brien County, IA, Sioux County, IA
The radar
The Sioux Falls radar (KFSD), 94 km from the middle of the area, began a volume at 22:59 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 |
|---|---|---|---|
| Apr 10, 6:15 PM CDT | Hail 0.75 | Boyden, IA |
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 nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.0 hours before the alert went out and 220 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
- 2400 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 114 m²/s²
- 0-3 km storm-relative helicity
- 219 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KFSD 102303 SVRFSD IAC041-059-141-167-102330- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 600 PM CDT TUE APR 10 2001 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EXTREME NORTHWEST CLAY IN NORTHWEST IOWA DICKINSON COUNTY IN NORTHWEST IOWA NORTHERN OBRIEN COUNTY IN NORTHWEST IOWA NORTHEAST SIOUX COUNTY IN NORTHWEST IOWA * UNTIL 630 PM CDT * AT 600 PM CDT...WEATHER SPOTTERS REPORTED TWO SEVERE THUNDERSTORMS. ONE WAS 8 MILES SOUTHWEST OF SHELDON...OR 9 MILES NORTHEAST OF ORANGE CITY. THE SECOND WAS 5 MILES NORTHEAST OF HARTLEY...OR 13 MILES WEST OF SPENCER. THE STORMS WERE MOVING NORTHEAST AT 45 MPH. * SEVERE THUNDERSTORMS WILL BE NEAR... SHELDON AROUND 605 PM CDT MELVIN...WEST OKOBOJI AROUND 615 PM CDT ASHTON...ARNOLDS PARK...OKOBOJI...WAHPETON AROUND 620 PM CDT ORLEANS...SPIRIT LAKE AROUND 625 PM CDT LAKE PARK AROUND 630 PM CDT TRAINED WEATHER SPOTTERS REPORTED DIME SIZE HAIL NEAR ORANGE CITY AT 558 PM CDT. THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS. LAT...LON 4303 9618 4317 9535 4349 9498 4344 9571
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 6:19 PM CDT | Severe Thunderstorm Warning | FSD | Osceola | 26 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2001Every severe thunderstorm warning in 2001
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.