Alert archive / Wisconsin / Flood Watches in 2020

Flood Watch 1, NWS Green Bay, WI

May 17, 20209 counties in Wisconsin

NWS Green Bay, WI issued this flood watch at May 17, 2020, 2:21 AM CDT for 9 counties in Wisconsin. It took effect at May 17, 2020, 10:00 AM CDT. It was in force for 22 hr.

The area

The counties it named.

The facts

Issued
May 17, 2020, 2:21 AM CDT (07:21 UTC)
In effect from
May 17, 2020, 10:00 AM CDT
Expired
May 18, 2020, 8:22 AM CDT
In force
22 hr
Issued by
NWS Green Bay, WI
Flood severity
None

Counties Brown County, WI, Calumet County, WI, Door County, WI, Kewaunee County, WI, Manitowoc County, WI, Marinette County, WI, Oconto County, WI, Outagamie County, WI, Winnebago County, WI

The radar

The Green Bay radar (KGRB), 9 km from the middle of the area, began a volume at 07:22 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 00:00Z, 7.4 hours before the alert went out and 9 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 00:00Z on 2020-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 00:00Z on 2020-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 69 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
1679 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
69 m²/s²
0-3 km storm-relative helicity
110 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 Green Bay, WI wrote its last area forecast discussion before this flood watch went out at May 16, 10:49 PM CDT, 3 hours 32 minutes earlier.

Area forecast discussion, May 16, 10:49 PM CDT, 3 hours 32 minutes before
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Hazardous weather outlook, May 16, 2:57 PM CDT, 11 hours 24 minutes before
Hazardous Weather Outlook
National Weather Service Green Bay WI
257 PM CDT Sat May 16 2020

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-172000-
Vilas-Oneida-Forest-Florence-Northern Marinette County-Lincoln-
Langlade-Menominee-Northern Oconto County-Door-Marathon-Shawano-
Wood-Portage-Waupaca-Outagamie-Brown-Kewaunee-Waushara-Winnebago-
Calumet-Manitowoc-Southern Marinette County-
Southern Oconto County-
257 PM CDT Sat May 16 2020

This Hazardous Weather Outlook is for north-central and northeast
Wisconsin.

.DAY ONE...Tonight

The probability of hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Sunday through Saturday

Locally heavy rainfall is expected Sunday into Sunday night,
mainly in central and east-central Wisconsin. One to two inches of
rain is forecast with lesser amounts farther north.

Persistent and gusty east to northeast winds Sunday into Monday
will result in the risk of lakeshore flooding along the southern
Bay. Areas along the shoreline from Oconto to Green Bay to the
Sturgeon Bay Canal will be most at risk. Minor flooding is also
possible along the Lake Michigan shoreline.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed tonight.

LMZ521-522-541>543-172000-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
257 PM CDT Sat May 16 2020

This Hazardous Weather Outlook is for portions of northwest Lake
Michigan and the waters of Green Bay.

.DAY ONE...Tonight

The probability of hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Sunday through Saturday

Conditions hazardous to small craft are expected Sunday due to
increasing northeast winds and building waves.

Strong and gusty east to northeast winds will approach gale force
Sunday night through Monday. A Gale Watch remains in effect.

RDM/AK

The office that day

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

IssuedProductOfficeCountiesLasted
May 17, 3:32 AM CDTGale WarningGRB45 hr
May 17, 3:55 PM CDTAreal Flood AdvisoryGRBBrown, Calumet, Kewaunee, Manitowoc13 hr

Nearby

Flood Watches in Wisconsin, 2020Every flood watch in 2020

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.