Alert archive / Iowa / Wind Chill Advisories in 2020

Wind Chill Advisory 5, NWS Des Moines, IA

February 13, 202013 counties in Iowa

NWS Des Moines, IA issued this wind chill advisory at Feb 13, 2020, 3:27 AM CST for 13 counties in Iowa. It took effect at Feb 13, 2020, 9:53 AM CST. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued
Feb 13, 2020, 3:27 AM CST (09:27 UTC)
In effect from
Feb 13, 2020, 9:53 AM CST
Expired
Feb 14, 2020, 10:00 AM CST
In force
24 hr
Issued by
NWS Des Moines, IA

Counties Boone County, IA, Calhoun County, IA, Davis County, IA, Hamilton County, IA, Hardin County, IA, Jasper County, IA, Marshall County, IA, Pocahontas County, IA, Poweshiek County, IA, Story County, IA, Tama County, IA, Wapello County, IA, Webster County, IA

The radar

The Des Moines radar (KDMX), 40 km from the middle of the area, began a volume at 09:30 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 00:00Z, 9.5 hours before the alert went out and 320 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 00:00Z on 2020-02-13Temperature 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 00:00Z on 2020-02-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -69 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
1309 m above ground
0-6 km bulk shear
84 kt
0-1 km storm-relative helicity
-69 m²/s²
0-3 km storm-relative helicity
39 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 13, 9:53 AM CSTWind Chill WarningDMXCerro Gordo, Emmet, Franklin, Hancock, Humboldt, Kossuth and 4 more24 hr

Nearby

Wind Chill Advisories in Iowa, 2020Every wind chill advisory in 2020

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.