Alert archive / Iowa / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 329, NWS Des Moines, IA

August 3, 2004Davis County, Wapello County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 3, 2004, 6:58 AM CDT for Davis County, Wapello County, Iowa. It was in force for 47 min. 2 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: Aug 3, 2004, 6:58 AM CDT (11:58 UTC)
Expired: Aug 3, 2004, 7:45 AM CDT
In force: 47 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

Counties Davis County, IA, Wapello County, IA

The radar

The Des Moines radar (KDMX), 155 km from the middle of the area, began a volume at 11:58 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
Aug 3, 7:00 AM CDT	TSTM WND GST 60	3 S Ottumwa, IA
Aug 3, 7:00 AM CDT	TSTM WND GST 60	3 S Ottumwa, IA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 2 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 12.0 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: 1196 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 1104 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 233 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDMX 031158
SVRDMX
IAC051-179-031245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
657 AM CDT TUE AUG 3 2004

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DAVIS COUNTY IN SOUTHEAST IOWA
  WAPELLO COUNTY IN SOUTHEAST IOWA
  THIS INCLUDES THE CITY OF OTTUMWA

* UNTIL 745 AM CDT

* AT 654 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM AGENCY TO BLOOMFIELD...OR FROM 4
  MILES EAST OF OTTUMWA TO 17 MILES SOUTH OF OTTUMWA...MOVING
  SOUTHEAST AT 25 MPH.

* SEVERE THUNDERSTORMS WILL BE...

  NEAR ELDON AROUND 715 AM CDT AND
  NEAR PULASKI AROUND 720 AM CDT.

THIS STORM HAS CAUSED DOWNED POWER POLES IN OTTUMWA.

OTHER WARNING LOCATIONS INCLUDE BLOOMFIELD MUNICIPAL 
AIRPORT...ELDON...FLORIS...OTTUMWA AND PULASKI.

DAMAGING WINDS OF 60 TO 70 MILES AN HOUR ARE LIKELY IN THE WARNED 
AREA.

HAIL UP TO THE SIZE OF NICKELS IS LIKELY IN THE WARNED AREA.

GO TO A BASEMENT OR SMALL INTERIOR ROOM. EXTENSIVE DAMAGE IS LIKELY. 
EVACUATE MOBILE HOMES...AND SEEK SHELTER IN A STURDY BUILDING. SEVERE
STRAIGHT LINE WINDS CAN SOUND LIKE A TORNADO...AND PRODUCE SIMILAR 
DAMAGE.

LAT...LON 4113 9253 4092 9248 4064 9248 4064 9180
      4091 9180 4113 9185

$$

KINNEY

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 2, 9:40 PM CDT, 9 hours 18 minutes earlier.

Area forecast discussion, Aug 2, 9:40 PM CDT, 9 hours 18 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
940 PM CDT MON AUG 2 2004

.DISCUSSION
SENT UPDATED ZONES SEVERAL MINUTES AGO.  ADJUSTMENTS WERE MADE TO
TEMP AND CLOUD TRENDS.  STORMS OVER SDKTA APPEAR ELEVATED ATTM AND
LOOK TO BE WEAKING BUT THESE WILL DROP INTO IA AFT 08Z PER
EXTRAPOLATION AND FOLLOWING THE CORFIDI VECTORS.  LOOKING AT MAINLY
A WIND EVENT BY THE TIME IT ROLLS INTO OUR CWA THOUGH A REPORT OR
TWO OF HAIL IS ALSO EXPECTED.  NO OTHER CHANGES TO THE FCST WERE
MADE.

.DMX WATCHES/WARNINGS/ADVISORIES...NONE

&&

FAB

Hazardous weather outlook, Aug 2, 11:35 AM CDT, 19 hours 23 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
1135 AM CDT MON AUG 2 2004

IAZ004>007-015>017-031100-
CERRO GORDO-EMMET-HANCOCK-KOSSUTH-PALO ALTO-WINNEBAGO-WORTH-
1135 AM CDT MON AUG 2 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT
ISOLATED THUNDERSTORMS COULD DEVELOP THIS AFTERNOON ACROSS
NORTHERN IOWA. THE MAIN THREAT WOULD BE LARGE HAIL UP TO 1 TO 2
INCHES IN DIAMETER. THE MOST FAVORED TIME FOR SEVERE WEATHER IS
DURING THE OVERNIGHT HOURS HOWEVER...MAINLY FROM 10 PM TO 6 AM. A
THUNDERSTORM COMPLEX IS EXPECTED TO MOVE ACROSS CENTRAL IOWA...
BUT THERE WILL STILL BE A THREAT OF DAMAGING WINDS ACROSS THE
NORTH.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY
ISOLATED SEVERE STORMS WITH DAMAGING WINDS COULD LINGER UNTIL MID
MORNING TUESDAY ACROSS THE MASON CITY AREA. OTHERWISE...ADDITIONAL
THUNDERSTORMS ARE POSSIBLE TUESDAY NIGHT...BUT MUCH OF THE ACTIVITY
IS EXPECTED TO STAY SOUTH OF CARROLL AND DENISON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE THIS AFTERNOON...BUT MORE LIKELY
FROM 10 PM TONIGHT UNTIL 6 AM TUESDAY MORNING.

IAZ023>028-033>039-044>050-057>062-070>075-031100-
ADAIR-AUDUBON-BLACK HAWK-BOONE-BREMER-BUTLER-CALHOUN-CARROLL-CASS-
CRAWFORD-DALLAS-FRANKLIN-GREENE-GRUNDY-GUTHRIE-HAMILTON-HARDIN-
HUMBOLDT-JASPER-MADISON-MAHASKA-MARION-MARSHALL-POCAHONTAS-POLK-
POWESHIEK-SAC-STORY-TAMA-WARREN-WEBSTER-WRIGHT-
1135 AM CDT MON AUG 2 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR A MUCH OF CENTRAL IOWA...
BETWEEN THE HIGHWAY 92 IN THE SOUTH TO HIGHWAY 3 IN THE NORTH.

.DAY ONE...THIS AFTERNOON AND TONIGHT
ISOLATED THUNDERSTORMS COULD DEVELOP LATE THIS AFTERNOON...MAINLY TO
THE NORTHEAST OF MARSHALLTOWN. IF THE STORMS DEVELOP...THE MAIN
THREAT WOULD BE LARGE HAIL OF 1 TO 2 INCHES IN DIAMETER. THE MOST
FAVORED TIME FOR SEVERE WEATHER IS DURING THE OVERNIGHT HOURS
HOWEVER...MAINLY FROM MIDNIGHT TO 8 AM. A THUNDERSTORM COMPLEX IS
EXPECTED TO MOVE FROM WEST TO EAST ACROSS CENTRAL IOWA...WITH A
THREAT OF DAMAGING STRAIGHT LINE WIND GUSTS OF 60 TO 70 MPH.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY
ISOLATED SEVERE STORMS WITH DAMAGING WINDS COULD LINGER UNTIL MID
MORNING TUESDAY ACROSS THE WATERLOO AND TAMA AREAS. OTHERWISE...
ADDITIONAL THUNDERSTORMS ARE POSSIBLE TUESDAY NIGHT...BUT MUCH OF THE
ACTIVITY IS EXPECTED TO STAY SOUTH OF A JEFFERSON TO TAMA LINE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS MOST LIKELY FROM MIDNIGHT UNTIL 8 AM TUESDAY
MORNING.

IAZ081>086-092>097-031100-
ADAMS-APPANOOSE-CLARKE-DAVIS-DECATUR-LUCAS-MONROE-RINGGOLD-TAYLOR-
UNION-WAPELLO-WAYNE-
1135 AM CDT MON AUG 2 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR A PORTION OF CENTRAL FROM
HIGHWAY 34 SOUTH.

.DAY ONE...THIS AFTERNOON AND TONIGHT
A THUNDERSTORM COMPLEX IS EXPECTED TO MOVE THROUGH CENTRAL IOWA
AFTER MIDNIGHT. THERE IS A SLIGHT CHANCE THAT SOME OF THESE STORMS
COULD REACH SOUTHERN IOWA...WITH THE MAIN THREAT BEING DAMAGING
STRAIGHT LINE WIND GUSTS FROM 60 TO 70 MPH.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY
ISOLATED SEVERE STORMS WITH DAMAGING WINDS COULD LINGER UNTIL MID
MORNING TUESDAY ACROSS THE OSKALOOSA AND OTTUMWA AREAS. OTHERWISE...
ADDITIONAL THUNDERSTORMS ARE EXPECTED TUESDAY NIGHT...WITH LARGE
HAIL AND WIND GUSTS OF 60 TO 70 MPH POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE FROM MIDNIGHT TONIGHT UNTIL 8 AM
TUESDAY MORNING.

JUNGBLUTH

In the hours before

Local storm report, Aug 3, 2:22 AM CDT, 4 hours 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
222 AM CDT TUE AUG 03 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0131 AM     HAIL             5 ENE LANESBORO         42.21N 94.61W
08/03/2004  0.75 INCH        CALHOUN            IA   TRAINED SPOTTER

&&

RPK

Local storm report, Aug 3, 2:24 AM CDT, 4 hours 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
224 AM CDT TUE AUG 03 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0206 AM     HAIL             3 N CHURDAN             42.20N 94.48W
08/03/2004  1.75 INCH        GREENE             IA   LAW ENFORCEMENT

            QUARTER TO GOLFBALL SIZED HAIL.

&&

RPK

Local storm report, Aug 3, 4:16 AM CDT, 2 hours 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
416 AM CDT TUE AUG 03 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0411 AM     TSTM WND GST     WEST DES MOINES         41.57N 93.75W
08/03/2004  60 MPH           POLK               IA   TRAINED SPOTTER

&&

RPK

Local storm report, Aug 3, 4:19 AM CDT, 2 hours 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
419 AM CDT TUE AUG 03 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0320 AM     HAIL             4 S FARNHAMVILLE        42.22N 94.42W
08/03/2004  1.00 INCH        CALHOUN            IA   LAW ENFORCEMENT

&&

RPK

Local storm report, Aug 3, 5:07 AM CDT, 1 hour 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
507 AM CDT TUE AUG 03 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0438 AM     HAIL             BOONE                   42.05N 93.88W
08/03/2004  1.75 INCH        BOONE              IA   BROADCAST MEDIA

&&

RPK

Local storm report, Aug 3, 5:41 AM CDT, 1 hour 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
541 AM CDT TUE AUG 03 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0521 AM     TSTM WND GST     KNOXVILLE               41.32N 93.10W
08/03/2004  58 MPH           MARION             IA   MESONET

&&

ROB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 1:51 AM CDT	Severe Thunderstorm Warning	DMX	Greene	54 min
Aug 3, 2:11 AM CDT	Severe Thunderstorm Warning	DMX	Calhoun	34 min
Aug 3, 2:42 AM CDT	Severe Thunderstorm Warning	DMX	Greene	58 min
Aug 3, 3:03 AM CDT	Severe Thunderstorm Warning	DMX	Boone	57 min
Aug 3, 3:55 AM CDT	Severe Thunderstorm Warning	DMX	Polk	60 min
Aug 3, 4:29 AM CDT	Severe Thunderstorm Warning	DMX	Marion, Warren	61 min
Aug 3, 4:31 AM CDT	Severe Thunderstorm Warning	DMX	Jasper	59 min
Aug 3, 4:43 AM CDT	Severe Thunderstorm Warning	DMX	Boone	57 min
Aug 3, 5:11 AM CDT	Severe Thunderstorm Warning	DMX	Polk	49 min
Aug 3, 5:29 AM CDT	Severe Thunderstorm Warning	DMX	Marion	61 min
Aug 3, 5:35 AM CDT	Severe Thunderstorm Warning	DMX	Monroe	55 min
Aug 3, 1:12 PM CDT	Severe Thunderstorm Warning	DMX	Emmet	63 min
Aug 3, 1:53 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth	52 min
Aug 3, 2:34 PM CDT	Severe Thunderstorm Warning	DMX	Winnebago	56 min
Aug 3, 2:44 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth	31 min
Aug 3, 3:02 PM CDT	Severe Thunderstorm Warning	DMX	Worth	58 min
Aug 3, 3:05 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Sac	55 min
Aug 3, 3:34 PM CDT	Severe Thunderstorm Warning	DMX	Webster	56 min
Aug 3, 3:48 PM CDT	Tornado Warning	DMX	Greene	42 min
Aug 3, 3:56 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun	34 min
Aug 3, 4:17 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton	43 min
Aug 3, 4:19 PM CDT	Severe Thunderstorm Warning	DMX	Franklin	41 min
Aug 3, 4:27 PM CDT	Severe Thunderstorm Warning	DMX	Hardin	48 min
Aug 3, 4:38 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Grundy	52 min
Aug 3, 4:42 PM CDT	Severe Thunderstorm Warning	DMX	Story	33 min
Aug 3, 4:52 PM CDT	Severe Thunderstorm Warning	DMX	Marshall	53 min
Aug 3, 4:57 PM CDT	Severe Thunderstorm Warning	DMX	Boone	33 min
Aug 3, 5:02 PM CDT	Tornado Warning	DMX	Marshall	43 min
Aug 3, 5:16 PM CDT	Severe Thunderstorm Warning	DMX	Hardin	29 min
Aug 3, 5:23 PM CDT	Severe Thunderstorm Warning	DMX	Tama	52 min
Aug 3, 5:27 PM CDT	Severe Thunderstorm Warning	DMX	Polk, Story	48 min
Aug 3, 5:28 PM CDT	Severe Thunderstorm Warning	DMX	Carroll	47 min
Aug 3, 5:32 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Grundy	58 min
Aug 3, 5:44 PM CDT	Severe Thunderstorm Warning	DMX	Jasper	31 min
Aug 3, 6:38 PM CDT	Severe Thunderstorm Warning	DMX	Guthrie	52 min
Aug 3, 6:53 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	37 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2004 Every severe thunderstorm warning in 2004

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.