Alert archive / Iowa / Tornado Warnings in 2007
Tornado Warning 49, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Sep 30, 2007, 6:21 PM CDT for Calhoun County, Pocahontas County, Sac County, Iowa. It was in force for 24 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
- Sep 30, 2007, 6:21 PM CDT (23:21 UTC)
- Expired
- Sep 30, 2007, 6:45 PM CDT
- In force
- 24 min
- Issued by
- NWS Des Moines, IA
- Area
- Counties, with a storm outline in the text
Counties Calhoun County, IA, Pocahontas County, IA, Sac County, IA
The radar
The Des Moines radar (KDMX), 131 km from the middle of the area, began a volume at 23:21 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 |
|---|---|---|---|
| Sep 30, 6:30 PM CDT | TORNADO | 1 N Lytton, IA | DELAYED REPORT OF TORNADO TOUCHDOWN NORTH OF LYTTON. TORNADO MOVED NNE AND DISSIPATED A MILE OR TWO EAST OF N28 WEST OF JOLLEY /CALHOUN COUNTY/. ESTIMATED PATH LENGTH IS 2 MILES AND ESTIMATED PATH WIDTH 20-30 YARDS. |
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 |
|---|---|---|---|
| Sep 30, 1:02 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.4 hours before the alert went out and 185 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
- 1296 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 450 m²/s²
- 0-3 km storm-relative helicity
- 472 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 KDMX 302321
TORDMX
IAC025-151-161-302345-
/O.NEW.KDMX.TO.W.0049.070930T2321Z-070930T2345Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
621 PM CDT SUN SEP 30 2007
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHERN POCAHONTAS COUNTY IN NORTHWEST IOWA...
NORTHWESTERN CALHOUN COUNTY IN WEST CENTRAL IOWA...
NORTHEASTERN SAC COUNTY IN WEST CENTRAL IOWA...
* UNTIL 645 PM CDT.
* AT 616 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 28 MILES
SOUTHWEST OF POCAHONTAS...OR ABOUT 24 MILES SOUTHEAST OF STORM
LAKE...MOVING NORTH AT 40 MPH.
* THE TORNADO WILL BE NEAR...
7 MILES SOUTHWEST OF POCAHONTAS BY 645 PM CDT...
THIS IS A HAZARDOUS SITUATION. SEEK SHELTER IN A BASEMENT...OR IN AN
INTERIOR ROOM. STAY AWAY FROM WINDOWS. IF YOU ARE OUTSIDE OR IN A
CAR...SEEK SHELTER IN A REINFORCED BUILDING.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT SUNDAY EVENING FOR
WESTERN IOWA.
LAT...LON 4250 9495 4256 9492 4260 9490 4279 9487
4276 9453 4229 9482 4238 9501
TIME...MOT...LOC 2321Z 201DEG 38KT 4242 9489
$$
DONAVON2 follow-up statements
000
WWUS53 KDMX 302333
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
632 PM CDT SUN SEP 30 2007
IAC025-151-161-302345-
/O.CON.KDMX.TO.W.0049.000000T0000Z-070930T2345Z/
POCAHONTAS IA-SAC IA-CALHOUN IA-
632 PM CDT SUN SEP 30 2007
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR
NORTHWESTERN CALHOUN...NORTHEASTERN SAC AND SOUTHERN POCAHONTAS
COUNTIES...
AT 629 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO. THIS
TORNADO WAS LOCATED NEAR LYTTON...OR ABOUT 22 MILES SOUTHEAST OF
STORM LAKE...MOVING NORTHEAST AT 30 MPH.
THE TORNADO WILL BE NEAR...
JOLLEY BY 640 PM CDT...
FONDA AND 6 MILES WEST OF POMEROY BY 645 PM CDT...
SEEK SHELTER IN A BASEMENT...OR IN AN INTERIOR ROOM. STAY AWAY FROM
WINDOWS. IF YOU ARE IN A CAR OR OUTSIDE...SEEK SHELTER IN A
REINFORCED BUILDING.
SPOTTERS REPORTED A RAPIDLY ROTATING WALL CLOUD ABOUT A MILE NORTH
OF HIGHWAY 20 NEAR LYTON. FUNNEL CLOUD OBSERVED NEARLY ONE HALF WAY
DOWN TO THE GROUND.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT SUNDAY EVENING FOR
WESTERN IOWA.
LAT...LON 4250 9495 4256 9492 4260 9490 4279 9487
4276 9453 4229 9482 4238 9501
TIME...MOT...LOC 2332Z 207DEG 26KT 4246 9485
$$
DONAVON000
WWUS53 KDMX 302340
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
640 PM CDT SUN SEP 30 2007
IAC161-302350-
/O.CAN.KDMX.TO.W.0049.000000T0000Z-070930T2345Z/
SAC IA-
640 PM CDT SUN SEP 30 2007
...THE TORNADO WARNING FOR NORTHEASTERN SAC COUNTY IS CANCELLED...
AT 638 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE EITHER WEAKENED OR
MOVED OUT OF THE AREA...AND NO LONGER POSE AN IMMEDIATE THREAT TO
LIFE OR PROPERTY. THEREFORE...THE TORNADO WARNING HAS BEEN CANCELLED.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT SUNDAY EVENING FOR
WESTERN IOWA.
LAT...LON 4260 9490 4279 9487 4276 9453 4239 9475
4236 9478 4236 9479 4247 9487 4251 9492
4256 9492
TIME...MOT...LOC 2340Z 207DEG 26KT 4251 9481
$$
IAC025-151-302345-
/O.CON.KDMX.TO.W.0049.000000T0000Z-070930T2345Z/
POCAHONTAS IA-CALHOUN IA-
640 PM CDT SUN SEP 30 2007
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR
NORTHWESTERN CALHOUN AND SOUTHERN POCAHONTAS COUNTIES...
AT 638 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO. THIS
TORNADO WAS LOCATED NEAR JOLLEY...OR ABOUT 22 MILES SOUTHEAST OF
STORM LAKE...MOVING NORTHEAST AT 30 MPH.
THE TORNADO WILL BE NEAR...
FONDA AND 6 MILES WEST OF POMEROY BY 645 PM CDT...
SEEK SHELTER IN A BASEMENT...OR IN AN INTERIOR ROOM. STAY AWAY FROM
WINDOWS. IF YOU ARE IN A CAR OR OUTSIDE...SEEK SHELTER IN A
REINFORCED BUILDING.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT SUNDAY EVENING FOR
WESTERN IOWA.
LAT...LON 4260 9490 4279 9487 4276 9453 4239 9475
4236 9478 4236 9479 4247 9487 4251 9492
4256 9492
TIME...MOT...LOC 2340Z 207DEG 26KT 4251 9481
$$
DONAVONThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 30, 4:29 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold | 31 min |
| Sep 30, 4:38 PM CDT | Severe Thunderstorm Warning | DMX | Union | 27 min |
| Sep 30, 4:43 PM CDT | High Wind Warning | DMX | Adair, Adams, Audubon, Carroll, Cass, Clarke and 8 more | 3 hr |
| Sep 30, 4:49 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Madison, Warren | 56 min |
| Sep 30, 5:21 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Lucas | 24 min |
| Sep 30, 5:23 PM CDT | Tornado Warning | DMX | Clarke, Lucas | 24 min |
| Sep 30, 5:25 PM CDT | Severe Thunderstorm Warning | DMX | Sac | 50 min |
| Sep 30, 5:33 PM CDT | Tornado Warning | DMX | Marion, Warren | 42 min |
| Sep 30, 6:03 PM CDT | Severe Thunderstorm Warning | DMX | Jasper | 57 min |
| Sep 30, 6:03 PM CDT | Tornado Warning | DMX | Sac | 15 min |
| Sep 30, 6:17 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Pocahontas, Sac | 43 min |
| Sep 30, 6:18 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Marion, Poweshiek | 42 min |
| Sep 30, 6:21 PM CDT | Tornado Warning | DMX | Jasper, Mahaska, Marion, Poweshiek | 39 min |
| Sep 30, 6:37 PM CDT | Tornado Warning | DMX | Poweshiek | 38 min |
| Sep 30, 6:47 PM CDT | Tornado Warning | DMX | Calhoun, Pocahontas | 15 min |
| Sep 30, 6:54 PM CDT | Tornado Warning | DMX | Jasper, Mahaska, Marion, Poweshiek | 26 min |
Nearby
Tornado Warnings in Iowa, 2007Every tornado warning in 2007Tornadoes 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.