Alert archive / Iowa / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 2, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Mar 21, 2007, 6:56 PM CDT for Buena Vista County, Iowa. It was in force for 19 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Mar 21, 2007, 6:56 PM CDT (23:56 UTC)
- Expired
- Mar 21, 2007, 7:15 PM CDT
- In force
- 19 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Counties, with a storm outline in the text
County Buena Vista County, IA
The radar
The Des Moines radar (KDMX), 157 km from the middle of the area, began a volume at 23:59 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 |
|---|---|---|---|
| Mar 21, 7:00 PM CDT | HAIL 1 | 7 Se Sioux Rapids, IA | PUBLIC REPORT |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Mar 21, 5:15 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.9 hours before the alert went out and 193 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
- 316 J/kg
- Mixed-layer CIN
- -260 J/kg
- Mixed-layer LCL
- 503 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 284 m²/s²
- 0-3 km storm-relative helicity
- 321 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KFSD 212357 SVRFSD IAC021-220015- /O.NEW.KFSD.SV.W.0002.070321T2356Z-070322T0015Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 656 PM CDT WED MAR 21 2007 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN BUENA VISTA COUNTY IN NORTHWEST IOWA * UNTIL 715 PM CDT * AT 656 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL. THIS STORM WAS LOCATED 6 MILES SOUTHWEST OF MARATHON...OR ABOUT 13 MILES NORTHEAST OF STORM LAKE...MOVING EAST AT 25 MPH. ANOTHER RAPIDLY DEVELOPING STORM WAS LOCATED 5 MILES WEST OF NEWELL...MOVING EAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... MARATHON AROUND 700 PM CDT... NEWELL AROUND 705 PM CDT... THIS EXTENDS THE PREVIOUS WARNING FOR BUENA VISTA COUNTY. AT 650 PM CDT...NICKEL SIZE HAIL WAS REPORTED 1 MILE SOUTHEAST OF REMBRANDT BY THE PUBLIC. THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS. LAT...LON 4285 9512 4256 9513 4256 9492 4291 9493 $$ CHAPMAN
1 follow-up statement
000 WWUS53 KFSD 220015 SVSFSD SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 715 PM CDT WED MAR 21 2007 IAC021-220024- /O.EXP.KFSD.SV.W.0002.000000T0000Z-070322T0015Z/ BUENA VISTA IA- 715 PM CDT WED MAR 21 2007 ...THE SEVERE THUNDERSTORM WARNING FOR EASTERN BUENA VISTA COUNTY EXPIRES AT 715 PM CDT... THE THUNDERSTORM EAST OF MARATHON HAS WEAKENED AND EXITED THE COUNTY...AND WAS NO LONGER SEVERE. A SECOND STORM WAS LOCATED ABOUT 5 MILES EAST OF NEWELL...WITH SMALL HAIL STILL POSSIBLE THROUGH 730 PM CDT IN FAR SOUTHEASTERN PORTIONS OF BUENA VISTA COUNTY. LAT...LON 4285 9512 4256 9513 4256 9492 4291 9493 $$ CHAPMAN
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 21, 6:31 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 29 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2007Every severe thunderstorm warning in 2007
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.