Alert archive / Iowa / Wind Chill Advisories in 2009

Wind Chill Advisory 7, NWS Quad Cities, IA

December 14, 200911 counties in Iowa

NWS Quad Cities, IA issued this wind chill advisory at Dec 14, 2009, 3:25 PM CST for 11 counties in Iowa. It took effect at Dec 15, 2009, 3:00 AM CST. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Dec 14, 2009, 3:25 PM CST (21:25 UTC)
In effect from
Dec 15, 2009, 3:00 AM CST
Expired
Dec 15, 2009, 11:00 AM CST
In force
8 hr
Issued by
NWS Quad Cities, IA

Counties Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Iowa County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA

The radar

The Quad Cities radar (KDVN), 82 km from the middle of the area, began a volume at 21:24 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

Minneapolis, MN (KMPX), launched 12:00Z, 9.4 hours before the alert went out and 358 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2009-12-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2009-12-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
446 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 14, 2:06 AM CSTWinter Weather AdvisoryDVNBenton, Buchanan, Delaware, Dubuque, Iowa, Johnson and 2 more10 hr
Dec 14, 3:32 AM CSTDense Fog AdvisoryDVNCedar, Clinton, Des Moines, Henry, Jackson, Jefferson and 7 more8 hr

Nearby

Wind Chill Advisories in Iowa, 2009Every wind chill advisory 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.