Alert archive / Iowa / Areal Flood Warnings in 2017

Areal Flood Warning 22, NWS La Crosse, WI

July 23, 2017Clayton County, Fayette County, Iowa

NWS La Crosse, WI issued this areal flood warning at Jul 23, 2017, 9:44 AM CDT for Clayton County, Fayette County, Iowa. It was in force for 19 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 23, 2017, 9:44 AM CDT (14:44 UTC)
Expired: Jul 24, 2017, 4:22 AM CDT
In force: 19 hr
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Flood severity: None

Counties Clayton County, IA, Fayette County, IA

The radar

The La Crosse radar (KARX), 113 km from the middle of the area, began a volume at 14:45 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, 2.7 hours before the alert went out and 164 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: 220 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 1453 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -58 m²/s²
0-3 km storm-relative helicity: -27 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -1.1

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 23, 6:51 AM CDT, 2 hours 53 minutes earlier.

Area forecast discussion, Jul 23, 6:51 AM CDT, 2 hours 53 minutes before

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Hazardous weather outlook, Jul 23, 4:01 AM CDT, 5 hours 43 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 22, 7:05 PM CDT	Special Weather Statement	ARX	Trempealeau	40 min
Jul 22, 8:33 PM CDT	Special Weather Statement	ARX	La Crosse	27 min
Jul 22, 8:44 PM CDT	Special Weather Statement	ARX	La Crosse	31 min
Jul 22, 9:02 PM CDT	Special Weather Statement	ARX	La Crosse	43 min
Jul 23, 7:59 AM CDT	Areal Flood Warning	ARX	La Crosse	12 hr

Nearby

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.