Alert archive / Wisconsin / Flash Flood Watches in 2018

Flash Flood Watch 6, NWS Green Bay, WI

September 4, 201813 counties in Wisconsin

NWS Green Bay, WI issued this flash flood watch at Sep 4, 2018, 8:41 AM CDT for 13 counties in Wisconsin. It took effect at Sep 4, 2018, 7:00 PM CDT. It was in force for 13 hr.

The area

The counties it named.

The facts

Issued: Sep 4, 2018, 8:41 AM CDT (13:41 UTC)
In effect from: Sep 4, 2018, 7:00 PM CDT
Expired: Sep 5, 2018, 7:39 AM CDT
In force: 13 hr
Issued by: NWS Green Bay, WI
Flood severity: None

Counties Florence County, WI, Forest County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Portage County, WI, Shawano County, WI, Vilas County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 111 km from the middle of the area, began a volume at 13:44 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

Minneapolis, MN (KMPX), launched 12:00Z, 1.7 hours before the alert went out and 358 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: 106 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 667 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Green Bay, WI wrote its last area forecast discussion before this flash flood watch went out at Sep 4, 3:57 AM CDT, 4 hours 44 minutes earlier.

Area forecast discussion, Sep 4, 3:57 AM CDT, 4 hours 44 minutes before

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Hazardous weather outlook, Sep 4, 3:16 AM CDT, 5 hours 25 minutes before

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In the hours before

Special weather statement, Sep 4, 6:09 AM CDT, 2 hours 32 minutes before

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Local storm report, Sep 4, 7:01 AM CDT, 1 hour 40 minutes before

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Local storm report, Sep 4, 7:36 AM CDT, 1 hour 5 minutes before

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Local storm report, Sep 4, 7:57 AM CDT, 44 minutes before

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Local storm report, Sep 4, 8:39 AM CDT, 2 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 3, 10:09 PM CDT	Special Weather Statement	GRB	Waushara, Winnebago	36 min
Sep 4, 6:09 AM CDT	Special Weather Statement	GRB	Brown, Kewaunee, Outagamie, Waupaca	21 min
Sep 4, 1:57 PM CDT	Special Weather Statement	GRB	Outagamie	63 min
Sep 4, 2:45 PM CDT	Special Weather Statement	GRB	Wood	45 min
Sep 4, 2:56 PM CDT	Small Craft Advisory	GRB		25 hr
Sep 4, 3:00 PM CDT	Beach Hazards Statement	GRB	Door, Kewaunee, Manitowoc	22 hr
Sep 4, 3:46 PM CDT	Special Weather Statement	GRB	Marathon	59 min
Sep 4, 4:40 PM CDT	Special Weather Statement	GRB	Wood	50 min
Sep 4, 5:20 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Portage, Wood	40 min
Sep 4, 6:09 PM CDT	Special Weather Statement	GRB	Marathon	51 min
Sep 4, 6:35 PM CDT	Severe Thunderstorm Warning	GRB	Marathon	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.