Alert archive / Iowa / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 349, NWS Des Moines, IA

August 3, 2004Black Hawk County, Grundy County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 3, 2004, 5:32 PM CDT for Black Hawk County, Grundy County, Iowa. It was in force for 58 min. 4 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, 5:32 PM CDT (22:32 UTC)
Expired: Aug 3, 2004, 6:30 PM CDT
In force: 58 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

Counties Black Hawk County, IA, Grundy County, IA

The radar

The Des Moines radar (KDMX), 127 km from the middle of the area, began a volume at 22:33 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
Aug 3, 5:37 PM CDT	TSTM WND GST 70	Dike, IA
Aug 3, 5:40 PM CDT	TSTM WND GST 70	Cedar Falls, IA
Aug 3, 6:00 PM CDT	TSTM WND DMG	Waterloo, IA	TWO FOUR FOOT DIAMETER TREES DOWN REPORTED BY KWWL.
Aug 3, 6:02 PM CDT	TSTM WND GST 60	10 S Waterloo, 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 4 storm reports to this severe thunderstorm warning; the first came 5 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 3, 4:25 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.5 hours before the alert went out and 192 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: 760 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 1021 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDMX 032232
SVRDMX
IAC013-075-032330-

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

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN GRUNDY COUNTY IN CENTRAL IOWA
  BLACK HAWK COUNTY IN NORTHEAST IOWA
  THIS INCLUDES THE CITY OF WATERLOO

* UNTIL 630 PM CDT

* AT 528 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 4 MILES NORTHWEST OF WATERLOO
  MUNICIPAL AIRPORT TO 6 MILES SOUTHWEST OF CONRAD...OR FROM 9 MILES
  NORTHWEST OF WATERLOO TO 38 MILES SOUTHWEST OF WATERLOO...MOVING
  SOUTHEAST AT 30 MPH.

* SEVERE THUNDERSTORMS WILL BE...

  NEAR REINBECK AROUND 540 PM CDT...
  NEAR CEDAR FALLS AROUND 545 PM CDT...
  NEAR WATERLOO AROUND 550 PM CDT...
  NEAR EVANSDALE AROUND 555 PM CDT...
  NEAR RAYMOND AROUND 600 PM CDT...
  NEAR GILBERTVILLE AROUND 605 PM CDT AND
  NEAR LA PORTE CITY AROUND 615 PM CDT.

VERY STRONG WINDS UP TO 60 MPH ARE LIKELY IN THE WARNED AREA.

MOVE TO AN INTERIOR ROOM AND STAY AWAY FROM WINDOWS. IF YOU LIVE IN A
MOBILE HOME...SEEK SHELTER IN A STURDY BUILDING.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT TUESDAY EVENING
FOR EASTERN IOWA.

LAT...LON 4252 9266 4255 9262 4255 9255 4262 9255
      4263 9252 4263 9243 4257 9210 4232 9208
      4230 9221 4229 9278 4221 9279 4222 9300

$$

GRAMS

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, 19 hours 52 minutes earlier.

Area forecast discussion, Aug 2, 9:40 PM CDT, 19 hours 52 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 3, 10:35 AM CDT, 6 hours 57 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
1035 AM CDT TUE AUG 3 2004

IAZ004>007-015>017-023>028-033>039-044>050-058>062-072>075-084>086-
096-097-041100-
APPANOOSE-BLACK HAWK-BOONE-BREMER-BUTLER-CALHOUN-CARROLL-CERRO GORDO-
CRAWFORD-DALLAS-DAVIS-EMMET-FRANKLIN-GREENE-GRUNDY-GUTHRIE-HAMILTON-
HANCOCK-HARDIN-HUMBOLDT-JASPER-KOSSUTH-LUCAS-MADISON-MAHASKA-MARION-
MARSHALL-MONROE-PALO ALTO-POCAHONTAS-POLK-POWESHIEK-SAC-STORY-TAMA-
WAPELLO-WARREN-WEBSTER-WINNEBAGO-WORTH-WRIGHT-
1035 AM CDT TUE AUG 3 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MUCH OF NORTH CENTRAL
AND CENTRAL IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT
A COMPLEX OF THUNDERSTORMS NEAR SIOUX FALLS IS EXPECTED TO CONTINUE
SOUTHEASTWARD INTO IOWA THIS AFTERNOON. THE STORMS SHOULD APPROACH
ESTHERVILLE TO POCAHONTAS BY 2 PM...FORT DODGE AND MASON CITY BY 4
PM...AND THE REST OF CENTRAL IOWA BETWEEN 4 PM AND 6 PM.
AS THE ATMOSPHERE WARMS THIS AFTERNOON...THE THUNDERSTORM COMPLEX
COULD TURN INTO A SIGNIFICANT PRODUCER OF WIND DAMAGE. LARGE HAIL
AND TORRENTIAL DOWNPOURS ARE ALSO POSSIBLE. ANOTHER ROUND OF STORMS
IS FORECAST OVERNIGHT...WITH HEAVY DOWNPOURS AND STRONG WINDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE LIKELY LATER THIS AFTERNOON AND TONIGHT.

IAZ057-070-071-081>083-092>095-041100-
ADAIR-ADAMS-AUDUBON-CASS-CLARKE-DECATUR-RINGGOLD-TAYLOR-UNION-WAYNE-
1035 AM CDT TUE AUG 3 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PART OF SOUTHWEST IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT
MOST STORMS SHOULD STAY NORTH OF AUDUBON...CRESTON AND CORYDON FOR
THIS AFTERNOON...BUT AN ISOLATED SEVERE STORM COULD OCCUR AFTER 5
PM. STORMS OVERNIGHT COULD PRODUCE ONE TO TWO INCH HAIL AND WINDS
OVER 65 MPH.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS EVENING AND TONIGHT.

JUNGBLUTH

In the hours before

Local storm report, Aug 3, 4:51 PM CDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
451 PM CDT TUE AUG 03 2004

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

0435 PM     TSTM WND DMG     14 N IOWA FALLS         42.72N 93.27W
08/03/2004                   FRANKLIN           IA   TRAINED SPOTTER

            12 INCH DIAMETER TREES DOWN IN BRADFORD.

&&

ST

Local storm report, Aug 3, 4:56 PM CDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
456 PM CDT TUE AUG 03 2004

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

0451 PM     HAIL             PILOT MOUND             42.16N 94.02W
08/03/2004  1.00 INCH        BOONE              IA   EMERGENCY MNGR

&&

ST

Local storm report, Aug 3, 5:07 PM CDT, 25 minutes before

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

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

0500 PM     HAIL             BOONE                   42.05N 93.88W
08/03/2004  0.75 INCH        BOONE              IA   EMERGENCY MNGR

&&

ST

Local storm report, Aug 3, 5:15 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
515 PM CDT TUE AUG 03 2004

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

0500 PM     TSTM WND DMG     20 E STORY CITY         42.19N 93.20W
08/03/2004                   MARSHALL           IA   EMERGENCY MNGR

            12 INCH DIAMETER TREE LIMBS DOWN IN MACCALLSBURG.

&&

ST

Local storm report, Aug 3, 5:21 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
521 PM CDT TUE AUG 03 2004

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

0500 PM     TSTM WND DMG     SCARVILLE               43.47N 93.62W
08/03/2004                   WINNEBAGO          IA   TRAINED SPOTTER

            DELAYED REPORT OF SEVERAL 9 INCH TREE LIMBS DOWN AND
            DAMAGE TO OUTBUILDINGS IN SCARVILLE.

&&

ST

Local storm report, Aug 3, 5:23 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
523 PM CDT TUE AUG 03 2004

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

0450 PM     TSTM WND DMG     ROLAND                  42.17N 93.50W
08/03/2004                   STORY              IA   TRAINED SPOTTER

            12 INCH DIAMETER TREES AND LIMBS DOWN.

&&

ST

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, 6:58 AM CDT	Severe Thunderstorm Warning	DMX	Davis, Wapello	47 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, 5:44 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.