High Wind in Iowa, April 18, 2004

Name: High Wind in Iowa, April 18, 2004
Start: 2004-04-18T15:10
End: 2004-04-18T21:00
Location: Iowa

April 18, 2004 · NWS DMX · 45 events in 45 counties and zones

A warm front lifted north across the state during the previous night. At the same time, intense low pressure formed to the west of Iowa and tracked northeast through South Dakota into Minnesota.

Where it happened

Every event with a place to put it; 45 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

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Floods
Wind
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Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

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The toll

Deaths: 0
Injuries: 0
Property damage: $3.6 million
Crop damage: None recorded
Events: 45

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS DMX wrote it up.

A warm front lifted north across the state during the previous night. At the same time, intense low pressure formed to the west of Iowa and tracked northeast through South Dakota into Minnesota. The low intensified as a negatively tilted upper level trough of low pressure in the upper atmosphere lifted northeast out of the southwest U.S. A strong jet and pronounced dry slot was evident in the warm sector of the system. The jet and dry slot tracked across Iowa during the afternoon and evening of the 18th. This set the stage for the high wind event. A very strong south to southwest flow developed over the state. Profiler data showed wind of 50 kts at 500 meters during much of the morning into the early part of the afternoon. The winds increased to 75 kts at the 500 meter level by the late afternoon and evening hours. The strong winds in the lowest range gates were not realized during much of the day do to strong upward vertical velocities. Strong subsidence developed during the late afternoon and evening hours, allowing for sufficient mixing and for the strong winds to be realized at the surface. During the day, winds were in the 30 to 35 MPH range across the state, with frequent gusts to around 55 MPH. During the late afternoon and early evening hours, winds increased with sustained winds of 40 MPH or more across most of the state, with many areas reporting gusts of 60 to 65 MPH. Widespread light damage was reported over the area, with scattered reports of significant wind damage. Several reports of tree, power line, and out building damage were received from around the state. Reports of semi-tractortrailers being blown off the roads. U.S. Highway 18 in Cerro Gordo County was closed by two overturned trucks that were blown over by the wind. Also, traffic was rerouted in Warren County at the junction of U.S. Highway 65-69 due to a truck being blown over. In addition to the wind damage problems, dry conditions around the state lead to areas of blowing dust. Visibilities were restricted at times, especially over the west half of the state. In Kossuth County, the visibility dropped to as low as three eigths of a mile at the Algona Airport for about an hour.

What forecasters said that day

The local office's own words before the first event, 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 the first event at Apr 18, 2:04 PM CST, 1 hour 6 minutes earlier.

Area forecast discussion, Apr 18, 2:04 PM CST, 1 hour 6 minutes before

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE DES MOINES IA
304 PM CDT SUN APR 18 2004

.DISCUSSION...
COLD FRONT MOVING ACROSS THE EASTERN DAKOTAS AND NEBRASKA WILL MOVE
ACROSS IOWA TONIGHT. DO EXPECT ANOTHER ROUND OF THUNDERSTORMS ALONG
WITH THE COLD FRONT...THOUGH IT SEEMS THE CAP IS GOING TO HOLD
STRONG FOR MUCH OF THE EVENING. STORMS CURRENTLY DEVELOPING ALONG
THE FRONTAL BOUNDARY ARE FOLLOWING THE SOUTHWEST FLOW AND RACING
PARALLEL TO THE FRONT. THIS SHOULD KEEP THIS ACTIVITY WEST OF THE
FORECAST AREA THROUGH MID TO LATE EVENING. WEAK THUNDER ASSOCIATED
WITH DEEPER MOISTURE OVER NE KANSAS MAY HOLD TOGETHER INTO SOUTH
CENTRAL IOWA. THIS ACTIVITY IS THE BEST CHANCE FOR RAIN ACROSS THE
SOUTH AND POPS HERE WILL BE ASSOCIATED WITH SOUTHERN ACTIVITY. BEST
CHANCE FOR SEVERE WILL BE ACROSS THE NORTHWEST WITH A FEW WIND AND
HAIL EVENTS POSSIBLE. CURRENT WIND ADVISORY IN EFFECT UNTIL 7 PM.
WILL NOT EXTEND THIS YET AND LET EVENING SHIFT EVALUATE FURTHER. DID
NOT WANT ADDED HEADLINES THIS EVENING IN CASE SEVERE WEATHER BECOMES
THE PRIMARY THREAT. HAVE APPROACHED HIGH WIND WARNING CRITERIA IN A
FEW LOCATIONS TODAY. SAVING GRACE WAS THE CLOUD COVER WHICH KEPT THE
THE WINDS FROM REALIZING THEIR POTENTIAL.

QUIETER MONDAY BEFORE REMINENTS OF SUPER TYPHOON SUDAL ARRIVE
TUESDAY. POTENTIAL FOR SOME HEAVY RAIN EXISTS ACROSS THE MIDWEST
WITH THIS SYSTEM WITH 1-2 INCHES POSSIBLE. REMAINDER OF THE WEEK IS
FILLED WITH SEVERAL VIGOROUS SHORTWAVES PASSING ACROSS THE CENTRAL
PLAINS. LATE WEDNESDAY APPEARS AS THE NEXT BEST CHANCE OF
PRECIPITATION WITH HEAVY RAIN NOT OUT OF THE QUESTION. A MORE QUIET
PERIOD TOWARD THE END OF THE EXTENDED WITH NEAR SEASONAL
TEMPERATURES.

&&

DONAVON

Hazardous weather outlook, Apr 18, 2:25 PM CST, 45 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
325 PM CDT SUN APR 18 2004

IAZ004>007-015>017-023>025-033>035-191100-
CALHOUN-CERRO GORDO-EMMET-HANCOCK-HUMBOLDT-KOSSUTH-PALO ALTO-
POCAHONTAS-SAC-WEBSTER-WINNEBAGO-WORTH-WRIGHT-
325 PM CDT SUN APR 18 2004

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

.DAY ONE...TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING.
A COLD FRONT MOVING INTO THE REGION IS EXPECTED TO INITIATE
THUNDERSTORMS TO THE WEST OF THE AREA.  THE THUNDERSTORMS WILL
ADVANCE EAST AS A LINE OF THUNDERSTORMS INTO NORTHWEST IOWA
LATER THIS EVENING.  THE STORMS ARE EXPECTED TO MOVE THE AREA
AROUND 9 PM IN THE FAR NORTHWEST...AND REACH THE NORTHEAST PART
OF THE AREA ROUND MIDNIGHT.  THE PRIMARY THREAT WILL BE DAMAGING
STRAIGHT LINE WINDS OF 60 TO 80 MPH. A SECONDARY THREAT WOULD BE
LARGE HAIL.  THERE IS SOME QUESTIONS AS TO HOW FAR SOUTH INTO IOWA
THE ORGANIZED THUNDERSTORMS WILL DEVELOP.  IT APPEARS AREAS NORTH OF
HIGHWAY 20 ARE MOST AT RISK...BUT THE THREAT AREA DOES EXTEND AS FAR
SOUTH AS INTERSTATE 80. MOST OF THE SEVERE THUNDERSTORMS WILL MOVE
EAST OF THE AREA BY 3 AM. IN ADDITION TO THE SEVERE WEATHER THREAT
THIS EVENING...STRONG WINDS WILL CONTINUE INTO THE EVENING
HOURS.  WINDS 30 TO 35 MPH...GUSTING AS HIGH AS 55 MPH WILL
DIMINISH TO THE 20 TO 35 MPH RANGE BY SUNSET.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. THUNDERSTORMS ARE
POSSIBLE TUESDAY...BUT AT THIS TIME THE THREAT OF SEVERE WEATHER
APPEARS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TONIGHT 8 PM AND 3 AM. COUNTY
EMERGENCY MANAGEMENT SHOULD PAY PARTICULAR ATTENTION TO UPDATED
FORECASTS.

IAZ026>028-036>039-044>050-057>060-070-071-191100-
ADAIR-AUDUBON-BLACK HAWK-BOONE-BREMER-BUTLER-CARROLL-CASS-CRAWFORD-
DALLAS-FRANKLIN-GREENE-GRUNDY-GUTHRIE-HAMILTON-HARDIN-MARSHALL-POLK-
STORY-TAMA-
325 PM CDT SUN APR 18 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PARTS OF WEST CENTRAL
THROUGH CENTRAL INTO NORTHEAST IOWA.

.DAY ONE...TONIGHT

SHOWERS AND ISOLATED THUNDERSTORMS WILL MOVE THROUGH THE AREA INTO
THE EVENING HOURS.  THESE STORMS ARE NOT EXPECTED TO BE SEVERE.
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE THIS
EVENING INTO THE OVERNIGHT HOURS. A COLD FRONT MOVING INTO THE REGION
IS EXPECTED TO INITIATE A LINE OF THUNDERSTORMS AS IT MOVES
SOUTHEAST.  THE STORMS WILL BE NORTHWEST OF THE AREA BY MID
EVENING. A BROKEN LINE OF STORMS SHOULD ENTER THE CENTRAL PARTS OF
IOWA TOWARD MIDNIGHT AND CONTINUE THROUGH 4 AM. THERE IS A SMALL
THREAT THESE STORMS COULD PRODUCE DAMAGING STRAIGHT LINE WINDS OF 60
TO 80 MPH. A SECONDARY THREAT WOULD BE LARGE HAIL. THERE IS SOME
QUESTIONS AS TO HOW FAR SOUTH INTO IOWA THE THUNDERSTORMS WILL
DEVELOP. AT THIS TIME IT APPEARS AREAS NORTH OF HIGHWAY 20 WILL SEE
THE MOST THUNDERSTORMS...WITH A CHANCE AS FAR SOUTH AS INTERSTATE
80.  IN ADDITION TO THE SEVERE WEATHER THREAT THIS EVENING...STRONG
WINDS WILL CONTINUE INTO THE EVENING HOURS.  WINDS 30 TO 35 MPH...
GUSTING AS HIGH AS 55 MPH WILL DIMINISH TO THE 20 TO 35 MPH RANGE BY
SUNSET.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. THUNDERSTORMS ARE
POSSIBLE TUESDAY...BUT AT THIS TIME THE THREAT OF SEVERE WEATHER
APPEARS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING BETWEEN MIDNIGHT AND
4 AM.

IAZ061-062-072>075-081>086-092>097-191100-
ADAMS-APPANOOSE-CLARKE-DAVIS-DECATUR-JASPER-LUCAS-MADISON-MAHASKA-
MARION-MONROE-POWESHIEK-RINGGOLD-TAYLOR-UNION-WAPELLO-WARREN-WAYNE-
325 PM CDT SUN APR 18 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE SOUTHEAST PART OF
CENTRAL IOWA.

.DAY ONE...TONIGHT

SHOWERS AND ISOLATED THUNDERSTORMS WILL MOVE THROUGH THE AREA INTO
THE EVENING HOURS.  THESE STORMS ARE NOT EXPECTED TO BE SEVERE.  IN
ADDITION...THERE IS A CHANCE OF THUNDERSTORMS AFTER MIDNIGHT THROUGH
5 AM. A COLD FRONT MOVING INTO THE REGION IS EXPECTED TO INITIATE
SCATTERED TO NUMEROUS THUNDERSTORMS NORTHWEST OF THE AREA BY MID
EVENING. A BROKEN LINE OF STORMS MAY REACH AS FAR SOUTH AS THE
CENTRAL PARTS OF IOWA TOWARD MIDNIGHT.  THE STORMS ARE EXPECTED TO
WEAKEN AND IF THEY REACH SOUTHEAST IOWA AT ALL ARE NOT LIKELY TO BE
SEVERE. THEY COULD PRODUCE GUSTY WINDS AND SOME HAIL HOWEVER.  IN
ADDITION TO THE SEVERE WEATHER THREAT THIS EVENING...STRONG WINDS
WILL CONTINUE INTO THE EVENING HOURS.  WINDS 30 TO 35 MPH...GUSTING
AS HIGH AS 55 MPH WILL DIMINISH TO THE 20 TO 35 MPH RANGE BY SUNSET.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. THUNDERSTORMS ARE
POSSIBLE TUESDAY...BUT AT THIS TIME THE THREAT OF SEVERE WEATHER
APPEARS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER IS NOT EXPECTED.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

45 high wind. Local standard time, as filed.

High Wind, Adair

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Adair forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.331, -94.471 (the zone’s center; the record gives no point)

High Wind, Adams

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Adams forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.029, -94.699 (the zone’s center; the record gives no point)

High Wind, Audubon

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Audubon forecast zone
Measured: 50 kt (58 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.685, -94.906 (the zone’s center; the record gives no point)

High Wind, Black Hawk

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Black Hawk forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.470, -92.309 (the zone’s center; the record gives no point)

High Wind, Boone

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Boone forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.037, -93.932 (the zone’s center; the record gives no point)

High Wind, Bremer

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Bremer forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.775, -92.318 (the zone’s center; the record gives no point)

High Wind, Butler

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Butler forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.732, -92.790 (the zone’s center; the record gives no point)

High Wind, Calhoun

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Calhoun forecast zone
Measured: 56 kt (64 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.385, -94.640 (the zone’s center; the record gives no point)

High Wind, Carroll

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Carroll forecast zone
Measured: 53 kt (61 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.036, -94.861 (the zone’s center; the record gives no point)

High Wind, Cass

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Cass forecast zone
Measured: 50 kt (58 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.332, -94.928 (the zone’s center; the record gives no point)

High Wind, Cerro Gordo

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Cerro Gordo forecast zone
Measured: 56 kt (64 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 43.082, -93.261 (the zone’s center; the record gives no point)

High Wind, Clarke

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Clarke forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.029, -93.785 (the zone’s center; the record gives no point)

High Wind, Crawford

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Crawford forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.037, -95.382 (the zone’s center; the record gives no point)

High Wind, Dallas

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Dallas forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.685, -94.040 (the zone’s center; the record gives no point)

High Wind, Decatur

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Decatur forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 40.738, -93.786 (the zone’s center; the record gives no point)

High Wind, Emmet

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Emmet forecast zone
Measured: 52 kt (60 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 43.378, -94.678 (the zone’s center; the record gives no point)

High Wind, Franklin

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Franklin forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.733, -93.262 (the zone’s center; the record gives no point)

High Wind, Greene

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Greene forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.036, -94.397 (the zone’s center; the record gives no point)

High Wind, Grundy

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Grundy forecast zone
Measured: 56 kt (64 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.402, -92.791 (the zone’s center; the record gives no point)

High Wind, Guthrie

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Guthrie forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.684, -94.501 (the zone’s center; the record gives no point)

High Wind, Hamilton

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Hamilton forecast zone
Measured: 52 kt (60 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.384, -93.707 (the zone’s center; the record gives no point)

High Wind, Hancock

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Hancock forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 43.082, -93.734 (the zone’s center; the record gives no point)

High Wind, Hardin

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Hardin forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.384, -93.240 (the zone’s center; the record gives no point)

High Wind, Humboldt

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Humboldt forecast zone
Measured: 56 kt (64 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.777, -94.207 (the zone’s center; the record gives no point)

High Wind, Jasper

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Jasper forecast zone
Measured: 50 kt (58 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.686, -93.054 (the zone’s center; the record gives no point)

High Wind, Kossuth

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Kossuth forecast zone
Measured: 56 kt (64 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 43.204, -94.207 (the zone’s center; the record gives no point)

High Wind, Lucas

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Lucas forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.029, -93.328 (the zone’s center; the record gives no point)

High Wind, Madison

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Madison forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.331, -94.016 (the zone’s center; the record gives no point)

High Wind, Marion

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Marion forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.334, -93.099 (the zone’s center; the record gives no point)

High Wind, Marshall

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Marshall forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.036, -92.999 (the zone’s center; the record gives no point)

High Wind, Palo Alto

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Palo Alto forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 43.082, -94.678 (the zone’s center; the record gives no point)

High Wind, Pocahontas

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Pocahontas forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.734, -94.679 (the zone’s center; the record gives no point)

High Wind, Polk

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Polk forecast zone
Measured: 55 kt (63 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.686, -93.573 (the zone’s center; the record gives no point)

High Wind, Ringgold

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Ringgold forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 40.735, -94.244 (the zone’s center; the record gives no point)

High Wind, Sac

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Sac forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.386, -95.105 (the zone’s center; the record gives no point)

High Wind, Story

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Story forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.036, -93.465 (the zone’s center; the record gives no point)

High Wind, Tama

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Tama forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.080, -92.532 (the zone’s center; the record gives no point)

High Wind, Taylor

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Taylor forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 40.737, -94.696 (the zone’s center; the record gives no point)

High Wind, Union

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Union forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.028, -94.242 (the zone’s center; the record gives no point)

High Wind, Warren

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Warren forecast zone
Measured: 57 kt (66 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 41.334, -93.561 (the zone’s center; the record gives no point)

High Wind, Wayne

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Wayne forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 40.740, -93.327 (the zone’s center; the record gives no point)

High Wind, Webster

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Webster forecast zone
Measured: 50 kt (58 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.428, -94.182 (the zone’s center; the record gives no point)

High Wind, Winnebago

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Winnebago forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 43.378, -93.734 (the zone’s center; the record gives no point)

High Wind, Worth

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Worth forecast zone
Measured: 35 kt (40 mph) measured sustained
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 43.377, -93.261 (the zone’s center; the record gives no point)

High Wind, Wright

When: April 18, 3:10 PM CST to 9:00 PM CST
Where: Wright forecast zone
Measured: 52 kt (60 mph) measured gust
Property damage: $80,000
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 42.733, -93.735 (the zone’s center; the record gives no point)

What these are

High Wind: Sustained non-thunderstorm winds of 40 mph or more for an hour, or gusts of 58 mph or more.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Iowa in 2004 Every state in 2004 This day in weather history Warnings in Iowa, April 2004

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5391099, 5391100, 5391101, 5391102, 5391103, 5391104, 5391105, 5391106, 5391107, 5391108, 5391109, 5391110, 5391111, 5391112, 5391113, 5391114, 5391115, 5391116, 5391117, 5391118, 5391119, 5391120, 5391121, 5391122, 5391123, 5391210, 5391211, 5391212, 5391213, 5391214, 5391215, 5391216, 5391217, 5391218, 5391219, 5391220, 5391221, 5391222, 5391223, 5391224, and more.