Alert archive / Iowa / Freeze Watches in 2012

Freeze Watch 3, NWS Quad Cities, IA

September 21, 201221 counties in Iowa; 11 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this freeze watch at Sep 21, 2012, 2:50 PM CDT for 21 counties in Iowa; 11 counties in Illinois; Clark County, Scotland County, Missouri. It took effect at Sep 23, 2012, 1:00 AM CDT. It was in force for .

The area

The counties it named.

The facts

Issued: Sep 21, 2012, 2:50 PM CDT (19:50 UTC)
In effect from: Sep 23, 2012, 1:00 AM CDT
Expired: Sep 22, 2012, 3:55 PM CDT
In force
Issued by: NWS Quad Cities, IA

All 34 counties

Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Carroll County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, McDonough County, IL, Mercer County, IL, Rock Island County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 48 km from the middle of the area, began a volume at 19:51 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

Lincoln, IL (KILX), launched 12:00Z, 7.8 hours before the alert went out and 259 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: 2528 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 152 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 watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Quad Cities, IA wrote its last area forecast discussion before this freeze watch went out at Sep 21, 1:38 PM CDT, 1 hour 12 minutes earlier.

Area forecast discussion, Sep 21, 1:38 PM CDT, 1 hour 12 minutes before

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Hazardous weather outlook, Sep 21, 4:09 AM CDT, 10 hours 41 minutes before

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In the hours before

Special weather statement, Sep 21, 1:13 PM CDT, 1 hour 37 minutes before

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Local storm report, Sep 21, 1:27 PM CDT, 1 hour 23 minutes before

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Local storm report, Sep 21, 2:11 PM CDT, 39 minutes before

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Special weather statement, Sep 21, 2:15 PM CDT, 35 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 21, 1:13 PM CDT	Special Weather Statement	DVN	Louisa	62 min
Sep 21, 2:15 PM CDT	Special Weather Statement	DVN	Scott	60 min

Nearby

Freeze Watches in Iowa, 2012 Freeze Watches in Illinois, 2012 Freeze Watches in Missouri, 2012 Every freeze watch 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.