Alert archive / Wisconsin / Flash Flood Warnings in 2018

Flash Flood Warning 2, NWS Green Bay, WI

September 5, 20184 counties in Wisconsin

NWS Green Bay, WI issued this flash flood warning at Sep 5, 2018, 12:19 AM CDT for 4 counties in Wisconsin. It was in force for 4 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 5, 2018, 12:19 AM CDT (05:19 UTC)
Expired: Sep 5, 2018, 4:09 AM CDT
In force: 4 hr
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Flood severity: None

Counties Langlade County, WI, Lincoln County, WI, Marathon County, WI, Oneida County, WI

The radar

The Green Bay radar (KGRB), 164 km from the middle of the area, began a volume at 05:19 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.

What was reported inside it

Time	Report	Where	Remark
Sep 5, 12:30 AM CDT	FLASH FLOOD	Merrill, WI	SEVERAL STREETS HAVE SECTIONS OF ROADS CLOSED DUE TO FLOODING IN THE CITY OF MERRILL.
Sep 5, 1:40 AM CDT	HEAVY RAIN 4.25	7 W Merrill, WI	RAINFALL FROM LAST EVENING INTO EARLY THIS MORNING.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 5.3 hours before the alert went out and 165 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: 1725 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1098 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

As transmitted.

345 
WGUS53 KGRB 050519
FFWGRB
WIC067-069-073-085-051115-
/O.NEW.KGRB.FF.W.0002.180905T0519Z-180905T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Green Bay WI
1219 AM CDT WED SEP 5 2018

The National Weather Service in Green Bay has issued a

* Flash Flood Warning for...
  Lincoln County in north central Wisconsin...
  Northwestern Marathon County in central Wisconsin...
  Southeastern Oneida County in north central Wisconsin...
  Northwestern Langlade County in north central Wisconsin...

* Until 615 AM CDT.

* At 1218 AM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. Flash flooding is ongoing or expected to begin
  shortly.

* Some locations that will experience flooding include...
  Merrill, Abbotsford, Parrish, Council Grounds State Park, New Wood
  Wildlife Area, Colby, Elcho, Athens, Hamburg and Unity.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4503 9031 4504 9020 4512 9020 4512 9005
      4525 9005 4580 8905 4545 8905 4478 9032

$$

Kurimski

3 follow-up statements

497 
WGUS53 KGRB 050522 CCA
FFWGRB
WIC067-069-073-085-051115-
/O.COR.KGRB.FF.W.0002.180905T0519Z-180905T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Green Bay WI
1222 AM CDT WED SEP 5 2018

The National Weather Service in Green Bay has issued a

* Flash Flood Warning for...
  Lincoln County in north central Wisconsin...
  Northwestern Marathon County in central Wisconsin...
  Southeastern Oneida County in north central Wisconsin...
  Northwestern Langlade County in north central Wisconsin...

* Until 615 AM CDT.

* At 1221 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Two to four inches of rain has 
  already fallen. Flash flooding is ongoing or expected to begin 
  shortly.

* Some locations that will experience flooding include...
  Merrill, Abbotsford, Parrish, Council Grounds State Park, New Wood
  Wildlife Area, Colby, Elcho, Athens, Hamburg and Unity.

Additional rainfall amounts of 1 to 2 inches is possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4503 9031 4504 9020 4512 9020 4512 9005
      4525 9005 4580 8905 4545 8905 4478 9032

$$

Kurimski

660 
WGUS73 KGRB 050609
FFSGRB

Flash Flood Statement
National Weather Service Green Bay WI
109 AM CDT WED SEP 5 2018

WIC067-069-073-085-051115-
/O.CON.KGRB.FF.W.0002.000000T0000Z-180905T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lincoln WI-Marathon WI-Oneida WI-Langlade WI-
109 AM CDT WED SEP 5 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 AM CDT FOR
LINCOLN...NORTHWESTERN MARATHON...SOUTHEASTERN ONEIDA AND
NORTHWESTERN LANGLADE COUNTIES...

At 107 AM CDT, local law enforcement reported flash flooding in the 
city of Merrill. Two to four inches of rain has already fallen. 

Some locations that will experience flooding include...
Merrill, Abbotsford, Parrish, Council Grounds State Park, New Wood
Wildlife Area, Colby, Elcho, Athens, Hamburg and Unity.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4503 9031 4504 9020 4512 9020 4512 9005
      4525 9005 4580 8905 4545 8905 4478 9032

$$

Kurimski

107 
WGUS73 KGRB 050909
FFSGRB

Flash Flood Statement
National Weather Service Green Bay WI
409 AM CDT WED SEP 5 2018

WIC067-069-073-085-050917-
/O.CAN.KGRB.FF.W.0002.000000T0000Z-180905T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lincoln WI-Marathon WI-Oneida WI-Langlade WI-
409 AM CDT WED SEP 5 2018

...THE FLASH FLOOD WARNING FOR LINCOLN...NORTHWESTERN MARATHON...
SOUTHEASTERN ONEIDA AND NORTHWESTERN LANGLADE COUNTIES IS
CANCELLED...

The heavy rain has ended. Flash flooding is no longer expected to 
pose a threat. Please continue to heed any remaining road closures.
An urban and small stream flood advisory remains in effect until 
6 am. 

LAT...LON 4503 9031 4504 9020 4512 9020 4512 9005
      4525 9005 4580 8905 4545 8905 4478 9032

$$

Eckberg

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 7:13 PM CDT	Severe Thunderstorm Warning	GRB	Marathon	32 min
Sep 4, 7:54 PM CDT	Special Weather Statement	GRB	Marathon	66 min
Sep 4, 8:15 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Lincoln, Marathon	45 min
Sep 4, 8:38 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln, Marathon	67 min
Sep 4, 8:39 PM CDT	Special Weather Statement	GRB	Marinette	51 min
Sep 4, 9:01 PM CDT	Special Weather Statement	GRB	Forest, Langlade	59 min
Sep 4, 9:14 PM CDT	Special Weather Statement	GRB	Marinette	46 min
Sep 4, 9:50 PM CDT	Special Weather Statement	GRB	Lincoln	40 min
Sep 4, 10:01 PM CDT	Areal Flood Advisory	GRB	Forest, Langlade, Lincoln, Marathon, Oneida, Vilas	8 hr
Sep 4, 10:43 PM CDT	Special Weather Statement	GRB	Florence, Forest, Lincoln, Oneida, Vilas	32 min
Sep 5, 12:06 AM CDT	Special Weather Statement	GRB	Langlade	39 min
Sep 5, 12:20 AM CDT	Areal Flood Advisory	GRB	Florence, Marinette	6 hr
Sep 5, 12:31 AM CDT	River Flood Warning	GRB	Wood	34 hr
Sep 5, 12:36 AM CDT	River Flood Warning	GRB	Lincoln, Marathon	70 hr
Sep 5, 12:36 AM CDT	River Flood Warning	GRB	Marathon	71 hr
Sep 5, 10:30 AM CDT	River Flood Advisory	GRB	Marathon	36 hr
Sep 5, 11:06 AM CDT	River Flood Warning	GRB	Marathon	18 hr
Sep 5, 11:08 AM CDT	River Flood Warning	GRB	Marathon	24 hr

Nearby

Flash Flood Warnings in Wisconsin, 2018 Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.