Alert archive / Iowa / Special Weather Statements in 2014

Special Weather Statement, NWS La Crosse, WI

August 18, 2014Mitchell County, Iowa

NWS La Crosse, WI issued this special weather statement at Aug 18, 2014, 2:29 AM CDT for Mitchell County, Iowa. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 18, 2014, 2:29 AM CDT (07:29 UTC)
Expired: Aug 18, 2014, 3:15 AM CDT
In force: 46 min
Issued by: NWS La Crosse, WI

County Mitchell County, IA

The radar

The La Crosse radar (KARX), 142 km from the middle of the area, began a volume at 07:31 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, 7.5 hours before the alert went out and 171 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: 748 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 658 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS La Crosse, WI wrote its last area forecast discussion before this special weather statement went out at Aug 17, 11:39 PM CDT, 2 hours 50 minutes earlier.

Area forecast discussion, Aug 17, 11:39 PM CDT, 2 hours 50 minutes before

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Hazardous weather outlook, Aug 17, 9:11 AM CDT, 17 hours 18 minutes before

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In the hours before

Local storm report, Aug 17, 10:55 PM CDT, 3 hours 34 minutes before

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Special weather statement, Aug 18, 1:37 AM CDT, 52 minutes before

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Special weather statement, Aug 18, 2:29 AM CDT, 0 minutes before

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The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 18, 1:37 AM CDT	Special Weather Statement	ARX	Mitchell	23 min
Aug 18, 3:14 AM CDT	Special Weather Statement	ARX	Mitchell	46 min
Aug 18, 3:03 PM CDT	Severe Thunderstorm Warning	ARX	Howard, Winneshiek	27 min
Aug 18, 3:30 PM CDT	Severe Thunderstorm Warning	ARX	Howard, Winneshiek	30 min
Aug 18, 3:58 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Winneshiek	47 min
Aug 18, 4:43 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee	47 min
Aug 18, 5:56 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Winneshiek	34 min
Aug 18, 6:45 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Winneshiek	30 min
Aug 17, 10:53 PM CDT	Areal Flood Advisory	ARX	Olmsted	112 min
Aug 18, 4:19 PM CDT	Severe Thunderstorm Warning	ARX	Fillmore, Houston	26 min

Nearby

Special Weather Statements in Iowa, 2014 Every special weather statement in 2014

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.