Alert archive / Wisconsin / Flash Flood Watches in 2010

Flash Flood Watch 7, NWS La Crosse, WI

August 8, 2010Crawford County, Grant County, Richland County, Wisconsin

NWS La Crosse, WI issued this flash flood watch at Aug 8, 2010, 9:51 PM CDT for Crawford County, Grant County, Richland County, Wisconsin. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Aug 8, 2010, 9:51 PM CDT (02:51 UTC)
Expired: Aug 9, 2010, 5:16 AM CDT
In force: 7 hr
Issued by: NWS La Crosse, WI
Flood severity: None

Counties Crawford County, WI, Grant County, WI, Richland County, WI

The radar

The La Crosse radar (KARX), 84 km from the middle of the area, began a volume at 02:54 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 00:00Z, 2.9 hours before the alert went out and 172 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: 3512 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 1011 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 179 m²/s²
0-3 km storm-relative helicity: 225 m²/s²
Significant tornado parameter: 3.2
Supercell composite: 27.1

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 Aug 8, 3:10 PM CDT, 6 hours 41 minutes earlier.

Area forecast discussion, Aug 8, 3:10 PM CDT, 6 hours 41 minutes before

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Hazardous weather outlook, Aug 8, 7:05 PM CDT, 2 hours 46 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 8, 8:15 PM CDT	River Flood Warning	ARX	Crawford	37 hr
Aug 9, 12:51 AM CDT	Areal Flood Advisory	ARX	Crawford, Grant, Richland	4 hr
Aug 9, 12:59 AM CDT	Severe Thunderstorm Warning	ARX	Crawford, Richland, Vernon	42 min
Aug 9, 9:34 AM CDT	River Flood Warning	ARX	Richland, Vernon	20 hr
Aug 8, 11:43 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Chickasaw, Clayton, Fayette, Howard, Winneshiek	51 min

Nearby

Flash Flood Watches in Wisconsin, 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.