Alert archive / Wisconsin / Flash Flood Watches in 2019

Flash Flood Watch 3, NWS Green Bay, WI

September 30, 20199 counties in Wisconsin

NWS Green Bay, WI issued this flash flood watch at Sep 30, 2019, 3:05 PM CDT for 9 counties in Wisconsin. It took effect at Oct 1, 2019, 7:00 AM CDT. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued: Sep 30, 2019, 3:05 PM CDT (20:05 UTC)
In effect from: Oct 1, 2019, 7:00 AM CDT
Expired: Oct 2, 2019, 3:45 AM CDT
In force: 21 hr
Issued by: NWS Green Bay, WI
Flood severity: None

Counties Brown County, WI, Calumet County, WI, Kewaunee County, WI, Manitowoc County, WI, Outagamie County, WI, Portage County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI

The radar

The Green Bay radar (KGRB), 36 km from the middle of the area, began a volume at 20:09 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, 8.1 hours before the alert went out and 36 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 Green Bay, WI wrote its last area forecast discussion before this flash flood watch went out at Sep 30, 12:56 PM CDT, 2 hours 9 minutes earlier.

Area forecast discussion, Sep 30, 12:56 PM CDT, 2 hours 9 minutes before

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Hazardous weather outlook, Sep 30, 12:55 PM CDT, 2 hours 10 minutes before

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In the hours before

Special weather statement, Sep 30, 11:49 AM CDT, 3 hours 16 minutes before

Special Weather Statement
National Weather Service Green Bay WI
1149 AM CDT Mon Sep 30 2019

WIZ005-010>012-018-019-030-035-301745-
Langlade WI-Vilas WI-Florence WI-Wood WI-Marathon WI-Oneida WI-
Forest WI-Lincoln WI-
1149 AM CDT Mon Sep 30 2019

...STRONG THUNDERSTORMS MOVING ACROSS CENTRAL AND NORTH CENTRAL
WISCONSIN...

At 1148 AM CDT, Doppler radar was tracking a strong thunderstorms
across Marathon, Taylor and Price counties, moving northeast at 40
mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm. Heavy rain, localized flooding and ponding on roadways
will also be possible.

Locations impacted include...
Wausau, Wisconsin Rapids, Antigo, Rhinelander, Crandon, Eagle River,
Marshfield, Weston, Merrill and Rib Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms, and may
lead to localized flooding. Do not drive your vehicle through
flooded roadways.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional
information from the National Weather Service.

&&

LAT...LON 4599 8867 4592 8810 4571 8806 4572 8842
      4538 8843 4538 8868 4512 8864 4512 8898
      4503 8898 4503 8922 4468 8923 4468 8985
      4451 8973 4425 8972 4425 9032 4503 9031
      4512 9004 4598 9005 4598 8993 4630 8993
TIME...MOT...LOC 1648Z 240DEG 34KT 4500 8960

Bersch

Special weather statement, Sep 30, 12:20 PM CDT, 2 hours 45 minutes before

Special Weather Statement
National Weather Service Green Bay WI
1220 PM CDT Mon Sep 30 2019

WIZ019>021-301800-
Langlade WI-Northern Oconto County WI-Menominee WI-
1220 PM CDT Mon Sep 30 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN MENOMINEE...NORTHERN
OCONTO AND SOUTHEASTERN LANGLADE COUNTIES UNTIL 100 PM CDT...

At 1220 PM CDT, Doppler radar was tracking a strong thunderstorm 8
miles east of Antigo, moving east at 45 mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

This strong thunderstorm will be near...
  White Lake around 1235 PM CDT.
  Gardner Dam Scout Camp around 1240 PM CDT.
  Mountain around 1250 PM CDT.
  Bear Paw Scout Camp around 1255 PM CDT.

Other locations impacted by this storm include Bryant, Boot Lake
Campground, Lake Noseum, Polar, Phlox, Upper Bass Lake, Boulder Lake
Campground, Crooked Lake, Langlade and Lakewood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4538 8837 4537 8831 4520 8831 4520 8824
      4513 8821 4501 8898 4503 8898 4503 8907
      4517 8914
TIME...MOT...LOC 1720Z 253DEG 41KT 4512 8897

Berdes

Local storm report, Sep 30, 12:53 PM CDT, 2 hours 12 minutes before

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Special weather statement, Sep 30, 1:12 PM CDT, 1 hour 53 minutes before

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Special weather statement, Sep 30, 2:20 PM CDT, 45 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 30, 3:41 AM CDT	Beach Hazards Statement	GRB	Door, Kewaunee, Manitowoc	15 hr
Sep 30, 3:51 AM CDT	Small Craft Advisory	GRB		21 hr
Sep 30, 6:48 AM CDT	Marine Dense Fog Advisory	GRB		9 hr
Sep 30, 11:49 AM CDT	Special Weather Statement	GRB	Florence, Forest, Langlade, Lincoln, Marathon, Oneida and 2 more	56 min
Sep 30, 12:20 PM CDT	Special Weather Statement	GRB	Menominee	40 min
Sep 30, 12:46 PM CDT	Severe Thunderstorm Warning	GRB	Marinette, Oconto	44 min
Sep 30, 1:12 PM CDT	Special Weather Statement	GRB	Marinette, Menominee, Oconto, Portage, Shawano, Wood	63 min
Sep 30, 2:20 PM CDT	Special Weather Statement	GRB	Door	40 min

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.