Alert archive / Iowa / Winter Storm Warnings in 2009
Winter Storm Warning 6, NWS Des Moines, IA
NWS Des Moines, IA issued this winter storm warning at Apr 4, 2009, 4:23 AM CDT for 29 counties in Iowa. It took effect at Apr 5, 2009, 1:00 AM CDT. It was in force for 18 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 4, 2009, 4:23 AM CDT (09:23 UTC)
- In effect from
- Apr 5, 2009, 1:00 AM CDT
- Expired
- Apr 5, 2009, 7:00 PM CDT
- In force
- 18 hr
- Issued by
- NWS Des Moines, IA
All 29 counties
Audubon County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Crawford County, IA, Emmet County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Kossuth County, IA, Marshall County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Story County, IA, Tama County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 90 km from the middle of the area, began a volume at 09:28 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.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 9.4 hours before the alert went out and 249 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2383 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm 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 winter storm warning went out at Apr 4, 3:56 AM CDT, 27 minutes earlier.
Area forecast discussion, Apr 4, 3:56 AM CDT, 27 minutes before
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</html>Hazardous weather outlook, Apr 3, 3:02 PM CDT, 13 hours 21 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 302 PM CDT FRI APR 3 2009 IAZ004>007-015>017-023>028-033>037-044>047-057-058-042015- EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO- POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN- WEBSTER-HAMILTON-HARDIN-CRAWFORD-CARROLL-GREENE-BOONE-AUDUBON- GUTHRIE- 302 PM CDT FRI APR 3 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR A PORTION OF CENTRAL IOWA THIS ENCOMPASSES MAINLY THE NORTHWEST THIRD OF CENTRAL IOWA. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY A SIGNIFICANT WINTER STORM IS POSSIBLE THIS WEEKEND. RAIN CHANGING TO SNOW IS ANTICIPATED LATE SATURDAY AFTERNOON AND SATURDAY NIGHT. PERIODS OF MODERATE TO HEAVY SNOWFALL WITH SIGNIFICANT ACCUMULATIONS MAY OCCUR BY SUNDAY MORNING. SNOWFALL AMOUNTS COULD BE AS HIGH AS 5 TO 10 INCHES. AN INCREASING NORTH WIND ON SUNDAY COULD CREATE BLIZZARD LIKE CONDITIONS. A WINTER STORM WATCH IS IN EFFECT FOR THE AREA. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUESTED SATURDAY NIGHT AND SUNDAY FOR SNOWFALL AND WINTRY CONDITION REPORTS. IAZ038-039-048>050-042015- GRUNDY-BLACK HAWK-STORY-MARSHALL-TAMA- 302 PM CDT FRI APR 3 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR A PORTION OF CENTRAL IOWA MAINLY BETWEEN HIGHWAY 20 AND HIGHWAY 30. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY A WINTER STORM IS POSSIBLE THIS WEEKEND. RAIN CHANGING TO SNOW IS ANTICIPATED LATE SATURDAY AND EARLY SUNDAY. BRIEF PERIODS OF MODERATE TO LOCALLY HEAVY SNOWFALL MAY OCCUR BY SUNDAY AFTERNOON...WITH ACCUMULATIONS OF 3 TO 5 INCHES POSSIBLE. AN INCREASING NORTH WIND ON SUNDAY COULD CREATE SOME BLOWING AND DRIFTING SNOW ESPECIALLY IN OPEN AREAS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME BUT SNOWFALL REPORTS WOULD BE APPRECIATED. IAZ059-060-070>072-081-042015- DALLAS-POLK-CASS-ADAIR-MADISON-ADAMS- 302 PM CDT FRI APR 3 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR A PORTION OF CENTRAL IOWA MAINLY BETWEEN HIGHWAY 30 AND INTERSTATE 80. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY SCATTERED THUNDERSTORMS ARE POSSIBLE MAINLY FROM SATURDAY EVENING THROUGH SATURDAY NIGHT. AN ISOLATED SEVERE STORM MAY OCCUR IN THE EVENING. THEREAFTER...RAIN WILL CHANGE TO SNOW ON SUNDAY WITH ACCUMULATIONS OF 1 TO 3 INCHES POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME BUT SNOWFALL REPORTS WOULD BE APPRECIATED. IAZ061-062-073>075-082>086-092>097-042015- JASPER-POWESHIEK-WARREN-MARION-MAHASKA-UNION-CLARKE-LUCAS-MONROE- WAPELLO-TAYLOR-RINGGOLD-DECATUR-WAYNE-APPANOOSE-DAVIS- 302 PM CDT FRI APR 3 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR A PORTION OF CENTRAL IOWA MAINLY ALONG AND SOUTH OF INTERSTATE 80. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY SCATTERED THUNDERSTORMS ARE POSSIBLE FROM SATURDAY EVENING THROUGH SUNDAY MORNING. AN ISOLATED SEVERE STORM MAY OCCUR SATURDAY EVENING. IN ADDITION... RAIN WILL CHANGE TO SNOW ON SUNDAY WITH ACCUMULATIONS OF AROUND AN INCH POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME. FAB
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 4, 4:23 AM CDT | Blizzard Warning | DMX | Calhoun, Carroll, Cerro Gordo, Crawford, Emmet, Hancock and 9 more | 24 hr |
| Apr 4, 4:23 AM CDT | Winter Storm Watch | DMX | Adair, Adams, Cass, Dallas, Jasper, Madison and 9 more | 11 hr |
| Apr 4, 3:26 PM CDT | Winter Weather Advisory | DMX | Adair, Adams, Audubon, Boone, Calhoun, Carroll and 25 more | 28 hr |
Nearby
Winter Storm Warnings in Iowa, 2009Every winter storm warning in 2009
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.