Alert archive / Wisconsin / Flash Flood Warnings in 2011

Flash Flood Warning 15, NWS La Crosse, WI

July 27, 2011Grant County, Wisconsin

NWS La Crosse, WI issued this flash flood warning at Jul 27, 2011, 7:24 PM CDT for Grant 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: Jul 27, 2011, 7:24 PM CDT (00:24 UTC)
Expired: Jul 27, 2011, 10:30 PM CDT
In force: 3 hr
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Flood severity: None

County Grant County, WI

The radar

The Quad Cities radar (KDVN), 108 km from the middle of the area, began a volume at 00:24 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
Jul 27, 9:30 PM CDT	FLASH FLOOD	Hazel Green, WI	PARTS OF COUNTY RD W FLOODED

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

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.4 hours before the alert went out and 108 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: 4556 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 962 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 316 m²/s²
Significant tornado parameter: 3.9
Supercell composite: 19.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

316 
WGUS53 KARX 280024
FFWARX
WIC043-280330-
/O.NEW.KARX.FF.W.0015.110728T0024Z-110728T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
724 PM CDT WED JUL 27 2011

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN GRANT COUNTY IN SOUTHWEST WISCONSIN...

* UNTIL 1030 PM CDT

* AT 722 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE      
  WARNED AREA. DOPPLER RADAR ESTIMATED THAT TWO TO THREE INCHES OF   
  RAIN HAS FALLEN IN THE PAST HOUR IN SOUTHEASTERN GRANT COUNTY.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO   
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING                
  INCLUDE...CUBA CITY...DICKEYVILLE AND HAZEL GREEN. SOME RIVERS AND 
  CREEKS THAT MAY EXPERIENCE FLOODING INCLUDE THE MENOMINEE          
  RIVER...SINSINAWA RIVER...HOLLOW BRANCH AND LOUISBURG CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 4256 9067 4259 9069 4264 9072 4265 9078
      4267 9078 4268 9042 4251 9042 4250 9043
      4250 9063

$$

HALBACH

2 follow-up statements

351 
WGUS73 KARX 280146
FFSARX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
846 PM CDT WED JUL 27 2011

WIC043-280330-
/O.CON.KARX.FF.W.0015.000000T0000Z-110728T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GRANT WI-
846 PM CDT WED JUL 27 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHEASTERN GRANT
COUNTY UNTIL 1030 PM CDT...

AT 842 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. 
DOPPLER RADAR INDICATED THAT 2 TO 5 INCHES OF RAIN FELL ACROSS 
SOUTHEASTERN GRANT COUNTY EARLIER THIS EVENING.  A FEW THUNDERSTORMS 
MAY STILL PASS THROUGH THE AREA OVER THE NEXT HOUR OR SO.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO 
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...SANDY 
HOOK...SINSINAWA AND HAZEL GREEN.  SOME RIVER AND CREEK LOCATIONS 
THAT MAY EXPERIENCE FLOODING INCLUDE THE SINSINAWA RIVER...SCRABBLE 
BRANCH...HOLLOW BRANCH AND THE MENOMINEE RIVER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

IN HILLY TERRAIN...THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH
ARE POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL
ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW
INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 4256 9067 4259 9069 4264 9072 4265 9078
      4267 9078 4268 9042 4251 9042 4250 9043
      4250 9063

$$

HALBACH

760 
WGUS73 KARX 280252
FFSARX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
952 PM CDT WED JUL 27 2011

WIC043-280330-
/O.CON.KARX.FF.W.0015.000000T0000Z-110728T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GRANT WI-
952 PM CDT WED JUL 27 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHEASTERN GRANT
COUNTY UNTIL 1030 PM CDT...

AT 949 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. 
DOPPLER RADAR ESTIMATES THAT BETWEEN 2 TO 5 INCHES OF RAIN HAS 
FALLEN ACROSS SOUTHEAST GRANT COUNTY...WITH POSSIBLY UP TO 7 INCHES 
ALONG THE ILLINOIS BORDER.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO 
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING 
INCLUDE...DICKEYVILLE...SANDY HOOK...SINSINAWA AND HAZEL GREEN.

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...SINSINAWA 
RIVER...SCRABBLE BRANCH...MENOMINEE RIVER...HOLLOW BRANCH...KIELER 
CREEK...AND LOUISBURG CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

IN HILLY TERRAIN...THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH
ARE POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL
ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW
INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 4256 9067 4259 9069 4264 9072 4265 9078
      4267 9078 4268 9042 4251 9042 4250 9043
      4250 9063

$$

HALBACH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 7:28 PM CDT	Severe Thunderstorm Warning	ARX	Grant	32 min
Jul 27, 10:23 PM CDT	Flash Flood Warning	ARX	Grant	9 hr
Jul 28, 7:27 AM CDT	Areal Flood Warning	ARX	Grant	6 hr
Jul 28, 4:48 PM CDT	Areal Flood Advisory	ARX	Buffalo, Jackson, Trempealeau	3 hr

Nearby

Flash Flood Warnings in Wisconsin, 2011 Every flash flood warning in 2011

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.