Alert archive / Iowa / Tornado Warnings in 2007

Tornado Warning 29, NWS Des Moines, IA

July 16, 2007Black Hawk County, Grundy County, Tama County, Iowa

NWS Des Moines, IA issued this tornado warning at Jul 16, 2007, 8:29 PM CDT for Black Hawk County, Grundy County, Tama County, Iowa. It was in force for 31 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
Jul 16, 2007, 8:29 PM CDT (01:29 UTC)
Expired
Jul 16, 2007, 9:00 PM CDT
In force
31 min
Issued by
NWS Des Moines, IA
Area
Counties, with a storm outline in the text

Counties Black Hawk County, IA, Grundy County, IA, Tama County, IA

The radar

The Des Moines radar (KDMX), 114 km from the middle of the area, began a volume at 01:28 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.

IssuedProductOfficeLasted
Jul 16, 2:07 PM CDTTornado WatchSPC8 hr
Jul 16, 3:38 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.5 hours before the alert went out and 190 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.

Skew-T log-pSkew-T log-p diagram, Davenport, at 00:00Z on 2007-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 405 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2007-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 211 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
405 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
1277 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
211 m²/s²
0-3 km storm-relative helicity
243 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WFUS53 KDMX 170129
TORDMX
IAC013-075-171-170200-
/O.NEW.KDMX.TO.W.0029.070717T0129Z-070717T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
829 PM CDT MON JUL 16 2007

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN GRUNDY COUNTY IN CENTRAL IOWA...
  NORTHERN TAMA COUNTY IN CENTRAL IOWA...
  SOUTHWESTERN BLACK HAWK COUNTY IN NORTHEAST IOWA...

* UNTIL 900 PM CDT

* AT 824 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR GRUNDY
  CENTER...OR ABOUT 21 MILES SOUTHWEST OF WATERLOO...MOVING SOUTHEAST
  AT 40 MPH.

* THE TORNADO WILL BE NEAR...
  REINBECK BY 835 PM CDT...
  DYSART BY 900 PM CDT...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA. GO TO A BASEMENT OR SMALL INTERIOR
ROOM ON THE LOWEST FLOOR

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 1100 PM CDT MONDAY EVENING
FOR NORTHERN IOWA. A TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL 1100
PM CDT MONDAY EVENING FOR SOUTHERN IOWA.

LAT...LON 4232 9285 4247 9273 4248 9256 4230 9230
      4205 9230
TIME...MOT...LOC 0129Z 299DEG 37KT 4235 9268

$$
2 follow-up statements
000 
WWUS53 KDMX 170146
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
842 PM CDT MON JUL 16 2007

IAC013-075-171-170200-
/O.CON.KDMX.TO.W.0029.000000T0000Z-070717T0200Z/
BLACK HAWK IA-GRUNDY IA-TAMA IA-
842 PM CDT MON JUL 16 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM CDT FOR NORTHERN
TAMA...EAST CENTRAL GRUNDY AND SOUTHWESTERN BLACK HAWK COUNTIES...

AT 837 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR REINBECK...OR
ABOUT 17 MILES SOUTHWEST OF WATERLOO...MOVING SOUTHEAST AT 40 MPH.

THE TORNADO WILL BE NEAR...
  TRAER BY 850 PM CDT...
  DYSART BY 900 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 1100 PM CDT MONDAY EVENING
FOR NORTHERN IOWA. A TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL 1100
PM CDT MONDAY EVENING FOR SOUTHERN IOWA.

LAT...LON 4232 9285 4247 9273 4248 9256 4230 9230
      4205 9230
TIME...MOT...LOC 0142Z 299DEG 37KT 4228 9252

$$
000 
WWUS53 KDMX 170203
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
903 PM CDT MON JUL 16 2007

IAC013-075-171-170213-
/O.EXP.KDMX.TO.W.0029.000000T0000Z-070717T0200Z/
BLACK HAWK IA-GRUNDY IA-TAMA IA-
903 PM CDT MON JUL 16 2007

...THE TORNADO WARNING FOR NORTHERN TAMA...EAST CENTRAL GRUNDY AND
SOUTHWESTERN BLACK HAWK COUNTIES EXPIRES AT 900 PM CDT...

AT 902 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE AREA.
THEREFORE...THE TORNADO WARNING HAS BEEN ALLOWED TO EXPIRE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING
FOR NORTHERN IOWA. A TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL 1100
PM CDT MONDAY EVENING FOR SOUTHERN IOWA.

LAT...LON 4232 9285 4247 9273 4248 9256 4230 9230
      4205 9230
TIME...MOT...LOC 0146Z 299DEG 37KT 4226 9247

$$

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 16, 7:10 PM CDTSevere Thunderstorm WarningDMXBlack Hawk65 min
Jul 16, 7:14 PM CDTSevere Thunderstorm WarningDMXCerro Gordo16 min
Jul 16, 7:40 PM CDTSevere Thunderstorm WarningDMXButler, Franklin50 min
Jul 16, 8:02 PM CDTSevere Thunderstorm WarningDMXGrundy43 min
Jul 16, 8:22 PM CDTSevere Thunderstorm WarningDMXBremer38 min
Jul 17, 4:26 AM CDTSevere Thunderstorm WarningDMXBlack Hawk41 min
Jul 17, 5:36 AM CDTSevere Thunderstorm WarningDMXBremer39 min
Jul 17, 3:50 PM CDTFlash Flood WatchDMXBlack Hawk, Bremer, Butler36 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.