Alert archive / Wisconsin / Areal Flood Warnings in 2017

Areal Flood Warning 19, NWS La Crosse, WI

July 22, 2017Grant County, Wisconsin; Clayton County, Iowa

NWS La Crosse, WI issued this areal flood warning at Jul 22, 2017, 9:56 AM CDT for Grant County, Wisconsin; Clayton County, Iowa. It was in force for 24 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: Jul 22, 2017, 9:56 AM CDT (14:56 UTC)
Expired: Jul 23, 2017, 9:45 AM CDT
In force: 24 hr
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Flood severity: None

Counties Clayton County, IA, Grant County, WI

The radar

The La Crosse radar (KARX), 108 km from the middle of the area, began a volume at 14:56 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 2.9 hours before the alert went out and 296 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: 996 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 124 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 areal flood warning 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 areal flood warning went out at Jul 22, 6:27 AM CDT, 3 hours 29 minutes earlier.

Area forecast discussion, Jul 22, 6:27 AM CDT, 3 hours 29 minutes before

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Hazardous weather outlook, Jul 22, 5:02 AM CDT, 4 hours 54 minutes before

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In the hours before

Local storm report, Jul 22, 8:04 AM CDT, 1 hour 52 minutes before

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Local storm report, Jul 22, 8:06 AM CDT, 1 hour 50 minutes before

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Local storm report, Jul 22, 8:07 AM CDT, 1 hour 49 minutes before

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Special weather statement, Jul 22, 8:40 AM CDT, 1 hour 16 minutes before

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Local storm report, Jul 22, 8:57 AM CDT, 59 minutes before

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Local storm report, Jul 22, 8:58 AM CDT, 58 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
Jul 21, 8:13 PM CDT	Areal Flood Warning	ARX	La Crosse	36 hr
Jul 21, 9:06 PM CDT	River Flood Warning	ARX	Clayton	38 hr
Jul 21, 9:06 PM CDT	River Flood Warning	ARX	Clayton	63 hr
Jul 21, 10:18 PM CDT	Flash Flood Warning	ARX	Chickasaw, Clayton, Fayette	12 hr
Jul 21, 11:54 PM CDT	Flash Flood Warning	ARX	Chickasaw, Floyd	10 hr
Jul 22, 1:21 AM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Howard, Winneshiek	39 min
Jul 22, 10:09 AM CDT	Areal Flood Warning	ARX	Chickasaw, Clayton, Fayette	24 hr

Nearby

Areal Flood Warnings in Wisconsin, 2017 Areal Flood Warnings in Iowa, 2017 Every areal flood warning in 2017

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.