Alert archive / Wisconsin / Flash Flood Watches in 2010

Flash Flood Watch 5, NWS La Crosse, WI

July 22, 20108 counties in Wisconsin; 6 counties in Minnesota; 8 counties in Iowa

NWS La Crosse, WI issued this flash flood watch at Jul 22, 2010, 3:17 AM CDT for 8 counties in Wisconsin; 6 counties in Minnesota; 8 counties in Iowa. It took effect at Jul 22, 2010, 4:00 AM CDT. It was in force for 20 hr.

The area

The counties it named.

The facts

Issued: Jul 22, 2010, 3:17 AM CDT (08:17 UTC)
In effect from: Jul 22, 2010, 4:00 AM CDT
Expired: Jul 23, 2010, 12:00 AM CDT
In force: 20 hr
Issued by: NWS La Crosse, WI
Flood severity: None

All 22 counties

Allamakee County, IA, Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Winona County, MN, Adams County, WI, Crawford County, WI, Grant County, WI, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Richland County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 47 km from the middle of the area, began a volume at 08:18 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, 8.3 hours before the alert went out and 221 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: 1907 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Jul 22, 2:42 AM CDT, 35 minutes earlier.

Area forecast discussion, Jul 22, 2:42 AM CDT, 35 minutes before

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Hazardous weather outlook, Jul 21, 5:03 AM CDT, 22 hours 14 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, 9:04 AM CDT	Areal Flood Advisory	ARX	Grant	78 min
Jul 22, 4:42 PM CDT	Flash Flood Warning	ARX	Crawford, Grant, Richland	3 hr

Nearby

Flash Flood Watches in Wisconsin, 2010 Flash Flood Watches in Iowa, 2010 Flash Flood Watches in Minnesota, 2010 Every flash flood watch in 2010

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.