Alert archive / Wisconsin / Flash Flood Watches in 2020

Flash Flood Watch 1, NWS Green Bay, WI

June 9, 20205 counties in Wisconsin

NWS Green Bay, WI issued this flash flood watch at Jun 9, 2020, 11:07 AM CDT for 5 counties in Wisconsin. It took effect at Jun 9, 2020, 6:00 PM CDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Jun 9, 2020, 11:07 AM CDT (16:07 UTC)
In effect from
Jun 9, 2020, 6:00 PM CDT
Expired
Jun 10, 2020, 2:48 AM CDT
In force
9 hr
Issued by
NWS Green Bay, WI
Flood severity
None

Counties Lincoln County, WI, Marathon County, WI, Oneida County, WI, Vilas County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 154 km from the middle of the area, began a volume at 16:09 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, 4.1 hours before the alert went out and 156 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 12:00Z on 2020-06-09Temperature 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 12:00Z on 2020-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.193958Sfc1 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
2796 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
52 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 Green Bay, WI wrote its last area forecast discussion before this flash flood watch went out at Jun 9, 6:06 AM CDT, 5 hours 1 minute earlier.

Area forecast discussion, Jun 9, 6:06 AM CDT, 5 hours 1 minute before
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Hazardous weather outlook, Jun 9, 3:43 AM CDT, 7 hours 24 minutes before
Hazardous Weather Outlook
National Weather Service Green Bay WI
343 AM CDT Tue Jun 9 2020

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-100845-
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-
343 AM CDT Tue Jun 9 2020

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

.DAY ONE...Today and Tonight

A several hour period of of heavy rain, thunderstorms and gusty winds
is expected later today and tonight as the remnants of Tropical Storm
Cristobal moves across Wisconsin. Local flooding of small streams
and urban areas is possible.

Gusty winds and large waves could produce local lakeshore flooding
on the Lake Michigan shoreline tonight. Dangerous swimming conditions
are likely late this afternoon and tonight as well.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Strong currents and dangerous swimming conditions are expected along
Lake Michigan beaches on Wednesday due to high waves.

Thunderstorms are possible early next week, but it is too early to
pin down any specific timing or severe probability.

.SPOTTER INFORMATION STATEMENT...

Spotters are requested to report any wind gusts greater than 40
mph, rainfall amounts greater than once inch, and any flooding.

LMZ521-522-541>543-100845-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
343 AM CDT Tue Jun 9 2020

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

.DAY ONE...Today and Tonight

Gale force wind gusts, high waves, and a few thunderstorms are
expected tonight. A Gale Warning is in effect for the Lake Michigan
nearshore waters. Hazardous conditions for small craft are expected
on the bay, where a Small Craft Advisory is in effect late this
afternoon through tonight.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Conditions hazardous for small craft are likely through midday
Wednesday. Gale force wind gusts are possible Wednesday evening
through Thursday morning.

RDM/KLJ

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 9, 3:45 AM CDTGale WarningGRB27 hr
Jun 9, 3:45 AM CDTSmall Craft AdvisoryGRB12 hr
Jun 9, 3:48 AM CDTBeach Hazards StatementGRBDoor, Kewaunee, Manitowoc32 hr
Jun 9, 3:37 PM CDTWind AdvisoryGRBBrown, Calumet, Door, Kewaunee, Manitowoc, Marinette and 3 more14 hr

Nearby

Flash Flood Watches in Wisconsin, 2020Every flash 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.