Alert archive / Wisconsin / Flash Flood Watches in 2019

Flash Flood Watch 5, NWS Milwaukee, WI

September 30, 201920 counties in Wisconsin

NWS Milwaukee, WI issued this flash flood watch at Sep 30, 2019, 2:42 PM CDT for 20 counties in Wisconsin. It took effect at Oct 1, 2019, 7:00 AM CDT. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued: Sep 30, 2019, 2:42 PM CDT (19:42 UTC)
In effect from: Oct 1, 2019, 7:00 AM CDT
Expired: Oct 2, 2019, 6:35 AM CDT
In force: 24 hr
Issued by: NWS Milwaukee, WI
Flood severity: None

Counties Columbia County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Marquette County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Sauk County, WI, Sheboygan County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 31 km from the middle of the area, began a volume at 19:44 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.7 hours before the alert went out and 157 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: 537 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 310 m²/s²
0-3 km storm-relative helicity: 343 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.9

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 Sep 30, 12:13 PM CDT, 2 hours 29 minutes earlier.

Area forecast discussion, Sep 30, 12:13 PM CDT, 2 hours 29 minutes before

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Hazardous weather outlook, Sep 30, 12:30 PM CDT, 2 hours 12 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
Sep 30, 1:44 AM CDT	Dense Fog Advisory	MKX	Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 14 more	9 hr
Sep 30, 3:15 PM CDT	Small Craft Advisory	MKX		9 hr

Nearby

Flash Flood Watches in Wisconsin, 2019 Every flash flood watch in 2019

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.