Alert archive / Wisconsin / Flash Flood Watches in 2010

Flash Flood Watch 2, NWS La Crosse, WI

June 26, 201010 counties in Wisconsin; 7 counties in Minnesota; 8 counties in Iowa

NWS La Crosse, WI issued this flash flood watch at Jun 26, 2010, 4:13 AM CDT for 10 counties in Wisconsin; 7 counties in Minnesota; 8 counties in Iowa. It took effect at Jun 26, 2010, 7:00 PM CDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Jun 26, 2010, 4:13 AM CDT (09:13 UTC)
In effect from: Jun 26, 2010, 7:00 PM CDT
Expired: Jun 27, 2010, 7:00 AM CDT
In force: 12 hr
Issued by: NWS La Crosse, WI
Flood severity: None

All 25 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, Wabasha County, MN, Winona County, MN, Buffalo County, WI, Clark County, WI, Crawford County, WI, Grant County, WI, Jackson County, WI, La Crosse County, WI, Monroe County, WI, Richland County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 42 km from the middle of the area, began a volume at 09:15 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, 9.2 hours before the alert went out and 205 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: 1350 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1067 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 166 m²/s²
0-3 km storm-relative helicity: 350 m²/s²
Significant tornado parameter: 2.6
Supercell composite: 13.6

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 Jun 26, 4:00 AM CDT, 13 minutes earlier.

Area forecast discussion, Jun 26, 4:00 AM CDT, 13 minutes before

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Hazardous weather outlook, Jun 25, 11:45 PM CDT, 4 hours 28 minutes before

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In the hours before

Special weather statement, Jun 25, 10:15 PM CDT, 5 hours 58 minutes before

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Local storm report, Jun 25, 10:23 PM CDT, 5 hours 50 minutes before

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Local storm report, Jun 25, 10:42 PM CDT, 5 hours 31 minutes before

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Local storm report, Jun 25, 10:44 PM CDT, 5 hours 29 minutes before

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Local storm report, Jun 25, 10:53 PM CDT, 5 hours 20 minutes before

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Local storm report, Jun 26, 12:05 AM CDT, 4 hours 8 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
Jun 25, 7:18 PM CDT	Severe Thunderstorm Warning	ARX	Buffalo	72 min
Jun 25, 8:36 PM CDT	Areal Flood Advisory	ARX	Buffalo	3 hr
Jun 25, 9:45 PM CDT	Areal Flood Advisory	ARX	Buffalo, La Crosse, Trempealeau, Vernon	3 hr
Jun 25, 9:01 PM CDT	Severe Thunderstorm Warning	ARX	Floyd, Mitchell	59 min
Jun 25, 9:43 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Floyd, Howard, Mitchell	47 min

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.