Alert archive / Wisconsin / Flash Flood Warnings in 2020

Flash Flood Warning 9, NWS La Crosse, WI

August 28, 2020Juneau County, Wisconsin

NWS La Crosse, WI issued this flash flood warning at Aug 28, 2020, 4:02 AM CDT for Juneau County, Wisconsin. It was in force for 3 hr. 1 report 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 28, 2020, 4:02 AM CDT (09:02 UTC)
Expired: Aug 28, 2020, 6:52 AM CDT
In force: 3 hr
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Flood severity: None

County Juneau County, WI

What was reported inside it

Time	Report	Where	Remark
Aug 28, 6:45 AM CDT	FLASH FLOOD	4 N Camp Douglas, WI	DELAYED REPORT. ROAD CLOSED DUE TO HIGH WATER.

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, 9.0 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: 1605 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 927 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

299 
WGUS53 KARX 280902
FFWARX
WIC057-281200-
/O.NEW.KARX.FF.W.0009.200828T0902Z-200828T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
402 AM CDT Fri Aug 28 2020

The National Weather Service in La Crosse has issued a

* Flash Flood Warning for...
  West Central Juneau County in central Wisconsin...

* Until 700 AM CDT.

* At 401 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 3.5 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...
  Kelly, Highways 80 And 58, Volk Field and Kens Marina And 
  Campground.

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 4401 9031 4399 8997 4398 8996 4397 8996
      4395 8995 4394 8995 4393 8996 4393 8995
      4392 8995 4392 8996 4392 8997 4392 8998
      4393 9031

FLASH FLOOD...RADAR INDICATED

$$

NMB

1 follow-up statement

781 
WGUS73 KARX 281152
FFSARX

Flash Flood Statement
National Weather Service La Crosse WI
652 AM CDT Fri Aug 28 2020

WIC057-281202-
/O.CAN.KARX.FF.W.0009.000000T0000Z-200828T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Juneau WI-
652 AM CDT Fri Aug 28 2020

...FLASH FLOOD WARNING FOR WEST CENTRAL JUNEAU COUNTY HAS BEEN 
REPLACED WITH A FLOOD ADVISORY...

The heavy rain has ended and flash flooding is no longer expected to 
pose a threat. The Flash Flood Warning has been replaced by an Areal 
Flood Warning. Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 700 PM CDT Friday for a 
portion of central Wisconsin.

LAT...LON 4401 9031 4399 8997 4398 8996 4397 8996
      4395 8995 4394 8995 4393 8996 4393 8995
      4392 8995 4392 8996 4392 8997 4392 8998
      4393 9031

$$

NMB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 7:13 PM CDT	Special Weather Statement	ARX	Juneau	47 min
Aug 27, 7:35 PM CDT	Flash Flood Watch	ARX	Adams, Jackson, Juneau, Monroe	17 hr
Aug 27, 10:14 PM CDT	Special Weather Statement	ARX	La Crosse, Monroe	31 min
Aug 27, 10:43 PM CDT	Special Weather Statement	ARX	Monroe, Vernon	47 min
Aug 27, 11:13 PM CDT	Special Weather Statement	ARX	Adams	47 min
Aug 27, 11:49 PM CDT	Special Weather Statement	ARX	Sauk	41 min
Aug 28, 12:28 AM CDT	Flash Flood Warning	ARX	Adams, Juneau	6 hr
Aug 28, 1:32 AM CDT	Special Weather Statement	ARX	Jackson	43 min
Aug 28, 3:28 AM CDT	Flash Flood Warning	ARX	Monroe	4 hr
Aug 28, 5:58 AM CDT	Flash Flood Warning	ARX	Jackson, Juneau, Monroe	4 hr
Aug 28, 6:25 AM CDT	Special Weather Statement	ARX	Buffalo	65 min
Aug 28, 6:48 AM CDT	Areal Flood Warning	ARX	Adams, Juneau	6 hr
Aug 28, 6:52 AM CDT	Special Weather Statement	ARX	Buffalo, Clark, Jackson, Taylor, Trempealeau	68 min
Aug 28, 7:07 AM CDT	Areal Flood Warning	ARX	Juneau, Monroe	6 hr
Aug 28, 7:35 AM CDT	Special Weather Statement	ARX	Clark, Jackson, La Crosse, Monroe, Taylor, Trempealeau and 1 more	70 min
Aug 28, 8:33 AM CDT	Special Weather Statement	ARX	Adams, Crawford, Juneau, La Crosse, Monroe, Richland and 1 more	72 min
Aug 28, 12:41 PM CDT	Areal Flood Warning	ARX	Adams, Jackson, Juneau, Monroe	20 hr
Aug 28, 3:30 PM CDT	Special Weather Statement	ARX	Grant	30 min
Aug 28, 3:57 PM CDT	Special Weather Statement	ARX	Grant	33 min
Aug 28, 4:25 PM CDT	Special Weather Statement	ARX	Grant	35 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.