Alert archive / Iowa / Freeze Warnings in 2007

Freeze Warning 1, NWS Des Moines, IA

September 14, 200724 counties in Iowa

NWS Des Moines, IA issued this freeze warning at Sep 14, 2007, 2:43 PM CDT for 24 counties in Iowa. It took effect at Sep 15, 2007, 1:00 AM CDT. It was in force for 9 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: Sep 14, 2007, 2:43 PM CDT (19:43 UTC)
In effect from: Sep 15, 2007, 1:00 AM CDT
Expired: Sep 15, 2007, 10:00 AM CDT
In force: 9 hr
Issued by: NWS Des Moines, IA

All 24 counties

Black Hawk County, IA, Boone County, IA, Bremer County, IA, Butler County, IA, Cerro Gordo County, IA, Emmet County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Jasper County, IA, Kossuth County, IA, Marshall County, IA, Palo Alto County, IA, Pocahontas County, IA, Poweshiek 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), 100 km from the middle of the area, began a volume at 19:45 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 12:00Z, 7.7 hours before the alert went out and 269 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1700 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: -126 m²/s²
0-3 km storm-relative helicity: 4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze 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 freeze warning went out at Sep 14, 12:35 PM CDT, 2 hours 8 minutes earlier.

Area forecast discussion, Sep 14, 12:35 PM CDT, 2 hours 8 minutes before

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Hazardous weather outlook, Sep 14, 5:55 AM CDT, 8 hours 48 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 14, 3:30 AM CDT	Frost Advisory	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 41 more	31 hr

Nearby

Freeze Warnings in Iowa, 2007 Every freeze warning in 2007

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.