Alert archive / Iowa / Winter Weather Advisories in 2012
Winter Weather Advisory 2, NWS Des Moines, IA
NWS Des Moines, IA issued this winter weather advisory at Jan 20, 2012, 3:27 AM CST for 9 counties in Iowa. It was in force for 13 hr.
The area
The counties it named.
The facts
- Issued
- Jan 20, 2012, 3:27 AM CST (09:27 UTC)
- Expired
- Jan 20, 2012, 3:57 PM CST
- In force
- 13 hr
- Issued by
- NWS Des Moines, IA
Counties Boone County, IA, Calhoun County, IA, Greene County, IA, Jasper County, IA, Marshall County, IA, Polk County, IA, Poweshiek County, IA, Sac County, IA, Story County, IA
The radar
The Des Moines radar (KDMX), 30 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
Davenport, (KDVN), launched 00:00Z, 9.5 hours before the alert went out and 272 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
- 1787 m above ground
- 0-6 km bulk shear
- 86 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- 239 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 weather advisory 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 weather advisory went out at Jan 20, 3:15 AM CST, 12 minutes earlier.
Area forecast discussion, Jan 20, 3:15 AM CST, 12 minutes before
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</html>Hazardous weather outlook, Jan 19, 3:26 PM CST, 12 hours 1 minute before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 326 PM CST THU JAN 19 2012 IAZ004>007-015>017-023>028-035>039-050-201200- EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO- POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-WEBSTER-HAMILTON- HARDIN-GRUNDY-BLACK HAWK-TAMA- 326 PM CST THU JAN 19 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MUCH OF NORTHERN IOWA. .DAY ONE...THIS AFTERNOON AND TONIGHT MODERATE TO HEAVY SNOW WILL DEVELOP ACROSS NORTHERN IOWA EARLY FRIDAY MORNING. A WINTER STORM WARNING IS IN EFFECT FOR THIS AREA. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY A WINTER STORM WARNING REMAINS IN EFFECT FOR NORTHERN IOWA FRIDAY WITH CONTINUED MODERATE TO HEAVY SNOW ANTICIPATED. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER DETAILS. DANGEROUS WIND CHILLS OF 15 TO 20 DEGREES BELOW ZERO ARE ALSO EXPECTED FROM FRIDAY EVENING INTO SATURDAY MORNING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. HOWEVER...SNOWFALL REPORTS ARE ENCOURAGED AND APPRECIATED. IAZ033-034-044>049-057>062-070>075-081>086-092>097-201200- SAC-CALHOUN-CRAWFORD-CARROLL-GREENE-BOONE-STORY-MARSHALL-AUDUBON- GUTHRIE-DALLAS-POLK-JASPER-POWESHIEK-CASS-ADAIR-MADISON-WARREN- MARION-MAHASKA-ADAMS-UNION-CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR- RINGGOLD-DECATUR-WAYNE-APPANOOSE-DAVIS- 326 PM CST THU JAN 19 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND SOUTHERN IOWA. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY SNOW IS LIKELY FROM LATE TONIGHT THROUGH FRIDAY. LIGHT TO MODERATE ACCUMULATIONS ARE EXPECTED WITH THIS SYSTEM. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. HOWEVER...SNOWFALL REPORTS ARE ENCOURAGED AND APPRECIATED. SMALL
Nearby
Winter Weather Advisories in Iowa, 2012Every winter weather advisory in 2012
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.