Alert archive / Iowa / Tornado Warnings in 2009
Tornado Warning 7, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at May 6, 2009, 5:23 PM CDT for 4 counties in Iowa. It was in force for 52 min. 6 reports 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
- May 6, 2009, 5:23 PM CDT (22:23 UTC)
- Expired
- May 6, 2009, 6:15 PM CDT
- In force
- 52 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
Counties Clay County, IA, Dickinson County, IA, O'Brien County, IA, Osceola County, IA
The radar
The Sioux Falls radar (KFSD), 113 km from the middle of the area, began a volume at 22:25 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 |
|---|---|---|---|
| May 6, 5:25 PM CDT | HAIL 0.75 | 7 S Ocheyedan, IA | IN MAY CITY |
| May 6, 5:32 PM CDT | HAIL 1.75 | 7 S Ocheyedan, IA | |
| May 6, 5:45 PM CDT | HAIL 1 | 5 N Hartley, IA | |
| May 6, 5:45 PM CDT | HAIL 1 | 6 E Melvin, IA | SHERIFF OFFICE IN SIBLEY IA...REPORTS QUARTER SIZE HAIL 3 MI WEST AND 1 MI NORTH OF MAY CITY AND DIME SIZE HAIL IN MAY CITY. |
| May 6, 5:50 PM CDT | HAIL 1.75 | 2 Ne Hartley, IA | |
| May 6, 6:01 PM CDT | HAIL 1 | 3 Wnw Everly, IA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 10.4 hours before the alert went out and 225 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1939 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 70 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS53 KFSD 062223 TORFSD IAC041-059-141-143-062315- /O.NEW.KFSD.TO.W.0007.090506T2223Z-090506T2315Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 523 PM CDT WED MAY 6 2009 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * TORNADO WARNING FOR... NORTHWESTERN CLAY COUNTY IN NORTHWEST IOWA SOUTHWESTERN DICKINSON COUNTY IN NORTHWEST IOWA NORTHEASTERN OBRIEN COUNTY IN NORTHWEST IOWA EASTERN OSCEOLA COUNTY IN NORTHWEST IOWA * UNTIL 615 PM CDT * AT 521 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR OCHEYEDAN...OR 20 MILES SOUTH OF WORTHINGTON...AND MOVING SOUTHEAST AT 15 MPH. * THIS TORNADIC STORM WILL BE NEAR... HARTLEY AROUND 605 PM CDT... EVERLY...MONETA AROUND 615 PM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A STURDY SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS. && LAT...LON 4325 9517 4310 9540 4336 9569 4348 9551 TIME...MOT...LOC 2223Z 325DEG 12KT 4334 9550 $$ BT
5 follow-up statements
000 WWUS53 KFSD 062231 SVSFSD SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 531 PM CDT WED MAY 6 2009 IAC041-059-141-143-062315- /O.CON.KFSD.TO.W.0007.000000T0000Z-090506T2315Z/ DICKINSON IA-OSCEOLA IA-OBRIEN IA-CLAY IA- 531 PM CDT WED MAY 6 2009 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR NORTHWESTERN CLAY...NORTHEASTERN OBRIEN...EASTERN OSCEOLA AND SOUTHWESTERN DICKINSON COUNTIES... AT 526 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A TORNADO. THIS TORNADO WAS LOCATED 6 MILES SOUTH OF OCHEYEDAN...OR 20 MILES WEST OF SPIRIT LAKE...MOVING SOUTHEAST AT 15 MPH. THE TORNADO WILL BE NEAR... HARTLEY AROUND 605 PM CDT... EVERLY AND MONETA AROUND 615 PM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING GOLFBALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS. AT 531 PM...GOLFBALL SIZED HAIL WAS REPORTED ONE MILE NORTH OF MAY CITY WITH THIS STORM. && LAT...LON 4325 9517 4310 9540 4336 9569 4348 9551 TIME...MOT...LOC 2230Z 325DEG 12KT 4332 9548 $$ BT
000 WWUS53 KFSD 062235 SVSFSD SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 535 PM CDT WED MAY 6 2009 IAC041-059-141-143-062315- /O.CON.KFSD.TO.W.0007.000000T0000Z-090506T2315Z/ DICKINSON IA-OSCEOLA IA-OBRIEN IA-CLAY IA- 535 PM CDT WED MAY 6 2009 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR NORTHWESTERN CLAY...NORTHEASTERN OBRIEN...EASTERN OSCEOLA AND SOUTHWESTERN DICKINSON COUNTIES... AT 531 PM CDT...A TORNADO WAS REPORTED. THIS TORNADO WAS LOCATED 8 MILES SOUTH OF OCHEYEDAN...OR 21 MILES NORTHWEST OF SPENCER...MOVING SOUTHEAST AT 15 MPH. THE TORNADO WILL BE NEAR... HARTLEY AROUND 605 PM CDT... MONETA AND EVERLY AROUND 615 PM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING GOLFBALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS. IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. THIS IS A DANGEROUS STORM. IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER IMMEDIATELY. RADAR HAS INDICATED THIS STORM IS INCREASING IN INTENSITY. && LAT...LON 4325 9517 4310 9540 4336 9569 4348 9551 TIME...MOT...LOC 2234Z 336DEG 13KT 4330 9549 $$ BT
000 WWUS53 KFSD 062244 SVSFSD SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 544 PM CDT WED MAY 6 2009 IAC041-059-141-143-062315- /O.CON.KFSD.TO.W.0007.000000T0000Z-090506T2315Z/ DICKINSON IA-OSCEOLA IA-OBRIEN IA-CLAY IA- 544 PM CDT WED MAY 6 2009 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR NORTHWESTERN CLAY...NORTHEASTERN OBRIEN...EASTERN OSCEOLA AND SOUTHWESTERN DICKINSON COUNTIES... AT 541 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A TORNADO. THIS TORNADO WAS LOCATED NEAR HARTLEY...OR 18 MILES NORTHWEST OF SPENCER...MOVING SOUTHEAST AT 20 MPH. THE TORNADO WILL BE NEAR... HARTLEY AROUND 555 PM CDT... MONETA AND EVERLY AROUND 610 PM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING GOLFBALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS. IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. && LAT...LON 4325 9517 4310 9540 4336 9569 4348 9551 TIME...MOT...LOC 2243Z 337DEG 16KT 4325 9546 $$ BT
000 WWUS53 KFSD 062250 SVSFSD SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 550 PM CDT WED MAY 6 2009 IAC041-059-141-143-062315- /O.CON.KFSD.TO.W.0007.000000T0000Z-090506T2315Z/ DICKINSON IA-OSCEOLA IA-OBRIEN IA-CLAY IA- 550 PM CDT WED MAY 6 2009 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR NORTHWESTERN CLAY...NORTHEASTERN OBRIEN...EASTERN OSCEOLA AND SOUTHWESTERN DICKINSON COUNTIES... AT 546 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A TORNADO. THIS TORNADO WAS LOCATED NEAR HARTLEY...OR 16 MILES WEST OF SPENCER...MOVING SOUTHEAST AT 20 MPH. THE TORNADO WILL BE NEAR... HARTLEY AROUND 555 PM CDT... EVERLY AND MONETA AROUND 610 PM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING GOLFBALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS. IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A STURDY SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. THIS STORM CONTINUES TO EXHIBIT STRONG ROTATION. IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER NOW && LAT...LON 4325 9517 4310 9540 4336 9569 4348 9551 TIME...MOT...LOC 2249Z 337DEG 16KT 4322 9545 $$ BT
000 WWUS53 KFSD 062252 SVSFSD SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 552 PM CDT WED MAY 6 2009 IAC041-059-141-143-062315- /O.CON.KFSD.TO.W.0007.000000T0000Z-090506T2315Z/ DICKINSON IA-OSCEOLA IA-OBRIEN IA-CLAY IA- 552 PM CDT WED MAY 6 2009 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR NORTHWESTERN CLAY...NORTHEASTERN OBRIEN...EXTREME SOUTHEASTERN OSCEOLA AND EXTREME SOUTHWESTERN DICKINSON COUNTIES... AT 551 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A TORNADO. THIS TORNADO WAS LOCATED NEAR HARTLEY...OR 15 MILES WEST OF SPENCER...MOVING SOUTHEAST AT 20 MPH. THE TORNADO WILL BE NEAR... EVERLY AND MONETA AROUND 610 PM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING GOLFBALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS. IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A STURDY SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. && LAT...LON 4325 9556 4326 9539 4318 9528 4310 9540 TIME...MOT...LOC 2253Z 337DEG 16KT 4321 9544 $$ BT
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 9:34 AM CDT | Severe Thunderstorm Warning | FSD | Dickinson | 26 min |
| May 6, 2:34 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 41 min |
| May 6, 3:07 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 23 min |
| May 6, 3:30 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 15 min |
| May 6, 5:15 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, Osceola | 45 min |
| May 6, 5:54 PM CDT | Tornado Warning | FSD | Clay, O'Brien | 35 min |
| May 6, 6:23 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 19 min |
Nearby
Tornado Warnings in Iowa, 2009Every tornado warning in 2009Tornadoes in 2009
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.