Alert archive / Wisconsin / Flash Flood Watches in 2018

Flash Flood Watch 6, NWS Milwaukee, WI

October 4, 201816 counties in Wisconsin

NWS Milwaukee, WI issued this flash flood watch at Oct 4, 2018, 12:57 PM CDT for 16 counties in Wisconsin. It took effect at Oct 5, 2018, 7:00 PM CDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Oct 4, 2018, 12:57 PM CDT (17:57 UTC)
In effect from: Oct 5, 2018, 7:00 PM CDT
Expired: Oct 6, 2018, 5:55 AM CDT
In force: 11 hr
Issued by: NWS Milwaukee, WI
Flood severity: None

Counties Columbia County, WI, Dane County, WI, Dodge County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Sauk County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 25 km from the middle of the area, began a volume at 17:58 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, 6.0 hours before the alert went out and 206 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: 1204 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 178 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 flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Milwaukee, WI wrote its last area forecast discussion before this flash flood watch went out at Oct 4, 12:53 PM CDT, 4 minutes earlier.

Area forecast discussion, Oct 4, 12:53 PM CDT, 4 minutes before

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Hazardous weather outlook, Oct 4, 7:28 AM CDT, 5 hours 29 minutes before

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The office that day

Everything else NWS Milwaukee, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 3, 9:29 PM CDT	Special Weather Statement	MKX	Iowa	46 min
Oct 3, 9:43 PM CDT	River Flood Warning	MKX	Rock	21 days
Oct 3, 11:05 PM CDT	Special Marine Warning	MKX		40 min

Nearby

Flash Flood Watches in Wisconsin, 2018 Every flash flood watch in 2018

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.