Alert archive / Wisconsin / Flash Flood Warnings in 2020

Flash Flood Warning 9, NWS Milwaukee, WI

August 27, 2020Columbia County, Dodge County, Wisconsin

NWS Milwaukee, WI issued this flash flood warning at Aug 27, 2020, 6:21 PM CDT for Columbia County, Dodge County, Wisconsin. It was in force for 4 hr. 4 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: Aug 27, 2020, 6:21 PM CDT (23:21 UTC)
Expired: Aug 27, 2020, 10:50 PM CDT
In force: 4 hr
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Flood severity: None

Counties Columbia County, WI, Dodge County, WI

The radar

The Milwaukee radar (KMKX), 78 km from the middle of the area, began a volume at 23:21 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
Aug 27, 7:59 PM CDT	FLASH FLOOD	Portage, WI	MULTIPLE REPORTS OUT OF PORTAGE OF ROADS IMPASSIBLE AND CITIZENS STUCK IN CARS. VEHICLES FLOATING/WATER LOGGED. REPORTS RELAYED VIA MEDIA AND LAW ENFORCEMENT.
Aug 27, 8:00 PM CDT	FLASH FLOOD	1 Ene Pardeeville, WI	DEPARTMENT OF PUBLIC WORKS IN PARDEEVILLE REPORTS HWY P HAS A WASH OUT NORTHEAST OF PARDEEVILLE. TIME ESTIMATED.
Aug 27, 8:14 PM CDT	HEAVY RAIN 3.53	2 N Pardeeville, WI	MESONET STATION PEEW3 PARDEEVILLE.
Aug 27, 8:50 PM CDT	HEAVY RAIN 3.17	Portage, WI	MESONET STATION SPRTG PORTAGE.

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 12:00Z, 11.4 hours before the alert went out and 134 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: 378 J/kg
Mixed-layer CIN: -195 J/kg
Mixed-layer LCL: 1253 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

372 
WGUS53 KMKX 272321
FFWMKX
WIC021-027-280230-
/O.NEW.KMKX.FF.W.0009.200827T2321Z-200828T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Milwaukee/Sullivan WI
621 PM CDT Thu Aug 27 2020

The National Weather Service in Milwaukee/Sullivan has issued a

* Flash Flood Warning for...
  Northeastern Columbia County in south central Wisconsin...
  West Central Dodge County in southeastern Wisconsin...

* Until 930 PM CDT.

* At 621 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 2.5 inches of 
  rain have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Beaver Dam, Portage, Pardeeville, Cambria, Wyocena and South 
  Beaver Dam.

Additional rainfall amounts of 0.5 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.

&&

LAT...LON 4353 8885 4342 8884 4342 8900 4354 8949
      4363 8949 4363 8923 4353 8924

FLASH FLOOD...RADAR INDICATED

$$

HANSEN

3 follow-up statements

776 
WGUS73 KMKX 280052
FFSMKX

Flash Flood Statement
National Weather Service Milwaukee/Sullivan WI
752 PM CDT Thu Aug 27 2020

WIC021-027-280230-
/O.CON.KMKX.FF.W.0009.000000T0000Z-200828T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Columbia WI-Dodge WI-
752 PM CDT Thu Aug 27 2020

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM CDT THIS 
EVENING FOR NORTHEASTERN COLUMBIA AND WEST CENTRAL DODGE COUNTIES...

At 752 PM CDT, Broadcast media reported that water is rising to the 
windows of cars in Portage and water rescues are ongoing. Between 2 
and 5 inches of rain have fallen. Flash flooding is ongoing or 
expected to begin shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Broadcast Media.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Beaver Dam, Portage, Pardeeville, Cambria, Wyocena and South 
  Beaver Dam.

Additional rainfall amounts of 1 to 3 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 4353 8885 4342 8884 4342 8900 4354 8949
      4363 8949 4363 8923 4353 8924

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

HANSEN

081 
WGUS53 KMKX 280223
FFWMKX
WIC021-027-280530-
/O.EXT.KMKX.FF.W.0009.000000T0000Z-200828T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Milwaukee/Sullivan WI
923 PM CDT Thu Aug 27 2020

The National Weather Service in Milwaukee/Sullivan has extended the

* Flash Flood Warning for...
  Northeastern Columbia County in south central Wisconsin...
  West Central Dodge County in southeastern Wisconsin...

* Until 1230 AM CDT.

* At 923 PM CDT, local law enforcement fast rising water trapping 
  people in cars. Between 3 and 5 inches of rain have fallen. Flash 
  flooding is already occurring.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Law enforcement.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Beaver Dam, Portage, Pardeeville, Cambria, Wyocena and South 
  Beaver Dam.

Additional rainfall amounts up to 0.5 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 4353 8885 4342 8884 4342 8900 4354 8949
      4363 8949 4363 8923 4353 8924

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

MARQUARDT

719 
WGUS73 KMKX 280350
FFSMKX

Flash Flood Statement
National Weather Service Milwaukee/Sullivan WI
1050 PM CDT Thu Aug 27 2020

WIC021-027-280400-
/O.CAN.KMKX.FF.W.0009.000000T0000Z-200828T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Columbia WI-Dodge WI-
1050 PM CDT Thu Aug 27 2020

...FLASH FLOOD WARNING FOR NORTHEASTERN COLUMBIA AND WEST CENTRAL 
DODGE COUNTIES HAS BEEN REPLACED WITH A FLOOD WARNING...

LAT...LON 4353 8885 4342 8884 4342 8900 4354 8949
      4363 8949 4363 8923 4353 8924

$$

MARQUARDT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 1:38 PM CDT	Special Marine Warning	MKX		25 min
Aug 27, 3:45 PM CDT	Special Weather Statement	MKX	Green Lake	45 min
Aug 27, 3:51 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dodge, Fond du Lac, Green Lake	39 min
Aug 27, 4:26 PM CDT	Special Weather Statement	MKX	Dodge	49 min
Aug 27, 4:41 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dodge	34 min
Aug 27, 5:03 PM CDT	Special Weather Statement	MKX	Fond du Lac	42 min
Aug 27, 5:05 PM CDT	Flash Flood Warning	MKX	Columbia, Dodge	6 hr
Aug 27, 5:13 PM CDT	Special Weather Statement	MKX	Columbia, Dodge	62 min
Aug 27, 5:24 PM CDT	Severe Thunderstorm Warning	MKX	Columbia	34 min
Aug 27, 6:09 PM CDT	Special Weather Statement	MKX	Fond du Lac	51 min
Aug 27, 6:13 PM CDT	Special Weather Statement	MKX	Dodge	47 min
Aug 27, 6:16 PM CDT	Special Weather Statement	MKX	Columbia	44 min
Aug 27, 6:53 PM CDT	Flash Flood Watch	MKX	Columbia, Dodge, Fond du Lac, Green Lake, Marquette, Ozaukee and 3 more	19 hr
Aug 27, 6:54 PM CDT	Special Weather Statement	MKX	Columbia, Sauk	66 min

Nearby

Flash Flood Warnings in Wisconsin, 2020 Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.