Alert archive / Iowa / Flood Watches in 2009

Flood Watch 1, NWS La Crosse, WI

March 7, 2009Grant County, Wisconsin; Clayton County, Fayette County, Iowa

NWS La Crosse, WI issued this flood watch at Mar 7, 2009, 3:39 PM CST for Grant County, Wisconsin; Clayton County, Fayette County, Iowa. It took effect at Mar 7, 2009, 7:00 PM CST. It was in force for 20 hr.

The area

The counties it named.

The facts

Issued: Mar 7, 2009, 3:39 PM CST (21:39 UTC)
In effect from: Mar 7, 2009, 7:00 PM CST
Expired: Mar 8, 2009, 3:43 PM CDT
In force: 20 hr
Issued by: NWS La Crosse, WI
Flood severity: None

Counties Clayton County, IA, Fayette County, IA, Grant County, WI

The radar

The La Crosse radar (KARX), 108 km from the middle of the area, began a volume at 21:39 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, 9.7 hours before the alert went out and 153 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: 726 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: 469 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 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 flood watch went out at Mar 7, 3:15 PM CST, 24 minutes earlier.

Area forecast discussion, Mar 7, 3:15 PM CST, 24 minutes before

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Hazardous weather outlook, Mar 7, 5:00 AM CST, 10 hours 39 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
Mar 7, 1:38 PM CST	Areal Flood Advisory	ARX	Grant	6 hr
Mar 7, 3:39 PM CST	Winter Weather Advisory	ARX	Adams, Buffalo, Clark, Crawford, Jackson, Juneau and 5 more	24 hr

Nearby

Flood Watches in Iowa, 2009 Flood Watches in Wisconsin, 2009 Every flood watch in 2009

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.