Alert archive / Iowa / Tornado Warnings in 2008

Tornado Warning 86, NWS Des Moines, IA

June 8, 2008Wapello County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 8, 2008, 7:26 PM CDT for Wapello County, Iowa. It was in force for 16 min. 3 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: Jun 8, 2008, 7:26 PM CDT (00:26 UTC)
Expired: Jun 8, 2008, 7:42 PM CDT
In force: 16 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

County Wapello County, IA

The radar

The Des Moines radar (KDMX), 137 km from the middle of the area, began a volume at 00:26 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
Jun 8, 7:27 PM CDT	TSTM WND GST 70	1 Nw Ottumwa, IA	POWER OUTAGE IN OTTUMWA.
Jun 8, 7:30 PM CDT	TORNADO	9 Nne Ottumwa, IA	POSSIBLE TORNADO. HOME LOST ROOF WITH WALL OF ONE ROOM PARTIALLY COLLAPSED. SEVERAL TREES DOWN AROUND THE HOME.
Jun 8, 7:35 PM CDT	TSTM WND DMG	Ottumwa, IA	2 1/2 FOOT DIAMETER TREE DOWN ON JEFFERSON STREET IN OTTUMWA...DELAYED 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
Jun 8, 4:43 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.4 hours before the alert went out and 162 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: 2433 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1200 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 10.9

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDMX 090025
TORDMX
IAC179-090100-
/O.NEW.KDMX.TO.W.0086.080609T0026Z-080609T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
726 PM CDT SUN JUN 8 2008

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN WAPELLO COUNTY IN SOUTHEAST IOWA...
  THIS INCLUDES THE CITY OF OTTUMWA...

* UNTIL 800 PM CDT.

* AT 722 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR OTTUMWA...
  MOVING NORTHEAST AT 62 MPH.

* THE TORNADO WILL BE NEAR...
  RURAL NORTHEASTERN WAPELLO COUNTY AT 740 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 1100 PM CDT SUNDAY EVENING
FOR SOUTHEASTERN IOWA.

LAT...LON 4094 9239 4108 9254 4116 9242 4117 9240
      4116 9221 4117 9219 4116 9218 4114 9218
      4106 9218
TIME...MOT...LOC 0026Z 231DEG 54KT 4108 9235

$$

DONAVON

1 follow-up statement

000 
WWUS53 KDMX 090042
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
743 PM CDT SUN JUN 8 2008

IAC179-090053-
/O.CAN.KDMX.TO.W.0086.000000T0000Z-080609T0100Z/
WAPELLO IA-
743 PM CDT SUN JUN 8 2008

...THE TORNADO WARNING FOR NORTHEASTERN WAPELLO COUNTY IS
CANCELLED...

AT 740 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.

REPORT TORNADOES...WIND IN EXCESS OF 50 MPH...HAIL LARGER THAN ONE
HALF INCH...OR STORM DAMAGE BY CALLING LOCAL LAW ENFORCEMENT AND
ASKING THEM TO RELAY THE REPORT TO THE NATIONAL WEATHER SERVICE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT SUNDAY EVENING
FOR SOUTHEASTERN IOWA.

LAT...LON 4094 9239 4108 9254 4116 9242 4117 9240
      4116 9221 4117 9219 4116 9218 4114 9218
      4106 9218
TIME...MOT...LOC 0043Z 231DEG 54KT 4124 9208

$$

DONAVON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 7:10 PM CDT	Severe Thunderstorm Warning	DMX	Davis, Wapello	39 min
Jun 8, 7:53 PM CDT	Areal Flood Warning	DMX	Black Hawk, Boone, Bremer, Butler, Calhoun, Cerro Gordo and 20 more	12 hr
Jun 8, 8:41 PM CDT	River Flood Warning	DMX	Polk	8 hr
Jun 8, 8:42 PM CDT	Flash Flood Warning	DMX	Cerro Gordo	6 hr
Jun 9, 7:39 AM CDT	Areal Flood Warning	DMX	Black Hawk, Boone, Bremer, Butler, Calhoun, Cerro Gordo and 20 more	12 hr
Jun 9, 9:50 AM CDT	River Flood Warning	DMX	Mahaska, Marion	28 days
Jun 9, 4:37 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek	38 min
Jun 9, 4:53 PM CDT	Flash Flood Warning	DMX	Poweshiek	6 hr
Jun 9, 6:07 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion	38 min
Jun 9, 6:19 PM CDT	Severe Thunderstorm Warning	DMX	Taylor	41 min
Jun 9, 6:32 PM CDT	Tornado Warning	DMX	Mahaska	28 min
Jun 9, 6:55 PM CDT	Severe Thunderstorm Warning	DMX	Taylor	50 min

Nearby

Tornado Warnings in Iowa, 2008 Every tornado warning in 2008 Tornadoes in 2008

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.