Alert archive / Iowa / Tornado Warnings in 2007

Tornado Warning 56, NWS Des Moines, IA

September 30, 2007Kossuth County, Palo Alto County, Iowa

NWS Des Moines, IA issued this tornado warning at Sep 30, 2007, 7:33 PM CDT for Kossuth County, Palo Alto County, Iowa. It was in force for 27 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, 7:33 PM CDT (00:33 UTC)
Expired: Sep 30, 2007, 8:00 PM CDT
In force: 27 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

Counties Kossuth County, IA, Palo Alto County, IA

The radar

The Des Moines radar (KDMX), 176 km from the middle of the area, began a volume at 00:33 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, 7:46 PM CDT	TSTM WND GST 60	4 S Emmetsburg, IA	ISU METEOROLOGY STUDENT ESTIMATED 60 MPH WIND GUSTS 4 MILES SOUTH OF EMMETSBURG.

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

Minneapolis, MN (KMPX), launched 00:00Z, 0.6 hours before the alert went out and 200 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 223 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 614 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDMX 010032
TORDMX
IAC109-147-010100-
/O.NEW.KDMX.TO.W.0056.071001T0033Z-071001T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
733 PM CDT SUN SEP 30 2007

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  WEST CENTRAL KOSSUTH COUNTY IN NORTH CENTRAL IOWA...
  EASTERN PALO ALTO COUNTY IN NORTHWEST IOWA...

* UNTIL 800 PM CDT.

* AT 729 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 6 MILES SOUTH OF
  EMMETSBURG...OR ABOUT 25 MILES EAST OF SPENCER...MOVING NORTHEAST
  AT 20 MPH.

* THE TORNADO WILL BE NEAR...
  EMMETSBURG BY 745 PM CDT...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT SUNDAY EVENING FOR
WESTERN IOWA.

LAT...LON 4326 9470 4326 9462 4325 9461 4325 9446
      4327 9445 4326 9426 4291 9453 4299 9480
TIME...MOT...LOC 0033Z 205DEG 18KT 4305 9466

$$

DONAVON

2 follow-up statements

000 
WWUS53 KDMX 010048
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
748 PM CDT SUN SEP 30 2007

IAC109-147-010100-
/O.CON.KDMX.TO.W.0056.000000T0000Z-071001T0100Z/
KOSSUTH IA-PALO ALTO IA-
748 PM CDT SUN SEP 30 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR EASTERN
PALO ALTO AND WEST CENTRAL KOSSUTH COUNTIES...

AT 746 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR EMMETSBURG...OR
ABOUT 27 MILES EAST OF SPENCER...MOVING NORTHEAST AT 15 MPH.

THE TORNADO WILL BE NEAR...
  RURAL CENTRAL PALO ALTO COUNTY AT 800 PM CDT

LAT...LON 4326 9470 4326 9462 4325 9461 4325 9446
      4327 9445 4326 9426 4291 9453 4299 9480
TIME...MOT...LOC 0048Z 206DEG 16KT 4310 9462

$$

DONAVON

000 
WWUS53 KDMX 010102
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
802 PM CDT SUN SEP 30 2007

IAC109-147-010112-
/O.EXP.KDMX.TO.W.0056.000000T0000Z-071001T0100Z/
KOSSUTH IA-PALO ALTO IA-
802 PM CDT SUN SEP 30 2007

...THE TORNADO WARNING FOR EASTERN PALO ALTO AND WEST CENTRAL KOSSUTH
COUNTIES EXPIRES AT 800 PM CDT...

AT 759 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE WEAKENED...AND NO
LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY. THEREFORE...THE
TORNADO WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 4326 9470 4326 9462 4325 9461 4325 9446
      4327 9445 4326 9426 4291 9453 4299 9480
TIME...MOT...LOC 0048Z 206DEG 16KT 4310 9462

$$

DONAVON

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 30, 7:03 PM CDT	Tornado Warning	DMX	Tama	27 min
Sep 30, 7:14 PM CDT	Tornado Warning	DMX	Poweshiek	24 min

Nearby

Tornado Warnings in Iowa, 2007 Every tornado warning in 2007 Tornadoes 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.