Alert archive / Iowa / Flash Flood Warnings in 2015

Flash Flood Warning 5, NWS La Crosse, WI

June 22, 2015Crawford County, Wisconsin; Allamakee County, Clayton County, Winneshiek County, Iowa

NWS La Crosse, WI issued this flash flood warning at Jun 22, 2015, 8:15 AM CDT for Crawford County, Wisconsin; Allamakee County, Clayton County, Winneshiek County, Iowa. It was in force for 3 hr. 6 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: Jun 22, 2015, 8:15 AM CDT (13:15 UTC)
Expired: Jun 22, 2015, 11:15 AM CDT
In force: 3 hr
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Flood severity: None

Counties Allamakee County, IA, Clayton County, IA, Winneshiek County, IA, Crawford County, WI

The radar

The La Crosse radar (KARX), 69 km from the middle of the area, began a volume at 13:18 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
Jun 22, 8:23 AM CDT	FLASH FLOOD	Waukon, IA	FLOODING IN WAUKON AREA
Jun 22, 8:25 AM CDT	FLASH FLOOD	Mcgregor, IA
Jun 22, 8:52 AM CDT	FLASH FLOOD	2 Nnw Dorchester, IA	WATERLOO CREEK FLOODED WITHIN 30 MINUTES
Jun 22, 9:56 AM CDT	HEAVY RAIN 2.31	Mount Zion, WI
Jun 22, 9:59 AM CDT	HEAVY RAIN 1.84	Steuben, WI
Jun 22, 10:55 AM CDT	HEAVY RAIN 2.82	1 Se Prairie Du Chien, WI

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 12:00Z, 1.3 hours before the alert went out and 191 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: 1240 J/kg
Mixed-layer CIN: -232 J/kg
Mixed-layer LCL: 853 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

517 
WGUS53 KARX 221315
FFWARX
IAC005-043-191-WIC023-221615-
/O.NEW.KARX.FF.W.0005.150622T1315Z-150622T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
815 AM CDT MON JUN 22 2015

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN CLAYTON COUNTY IN NORTHEASTERN IOWA...
  ALLAMAKEE COUNTY IN NORTHEASTERN IOWA...
  WINNESHIEK COUNTY IN NORTHEASTERN IOWA...
  CRAWFORD COUNTY IN SOUTHWESTERN WISCONSIN...

* UNTIL 1115 AM CDT
    
* AT 814 AM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
  TORRENTIAL RAINFALL ACROSS THE AREA. RADAR INDICATES THAT BETWEEN 
  2 AND 3 INCHES OF RAIN FELL IN LESS THAN 90 MINUTES...AND STREET 
  FLOODING IS OCCURRING IN SOME PLACES. FLASH FLOODING IS EXPECTED 
  TO BEGIN SHORTLY. EXCESSIVE RAINFALL OVER THE WARNED AREA WILL 
  CAUSE MUD SLIDES NEAR STEEP TERRAIN. THE MUD SLIDE CAN CONSIST OF 
  ROCK...MUD...VEGETATION AND OTHER LOOSE MATERIALS.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  DECORAH...PRAIRIE DU CHIEN...WAUKON...BOSCOBEL...ELKADER...
  LANSING...SOLDIERS GROVE...POSTVILLE...MONONA...CALMAR...
  MCGREGOR...OSSIAN...NEW ALBIN...MARQUETTE...SPILLVILLE...HARPERS
  FERRY...RIDGEWAY...FARMERSBURG...VOLGA AND HARDIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE. STAY 
AWAY OR BE SWEPT AWAY. RIVER BANKS AND CULVERTS CAN BECOME UNSTABLE 
AND UNSAFE. 

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4308 9161 4321 9208 4350 9208 4350 9122
      4346 9123 4342 9120 4342 9067 4315 9071
      4299 9106 4300 9114 4276 9161

$$

MW

2 follow-up statements

715 
WGUS73 KARX 221423
FFSARX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
923 AM CDT MON JUN 22 2015

IAC005-043-191-WIC023-221615-
/O.CON.KARX.FF.W.0005.000000T0000Z-150622T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLAYTON IA-ALLAMAKEE IA-WINNESHIEK IA-CRAWFORD WI-
923 AM CDT MON JUN 22 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 AM CDT FOR
NORTHWESTERN CLAYTON...ALLAMAKEE...WINNESHIEK AND CRAWFORD
COUNTIES...

AT 918 AM CDT...DOPPLER RADAR INDICATED SHOWERS WITH LIGHTER RAIN 
CONTINUED ACROSS THE WARNED AREA. DOPPLER RADAR ESTIMATED AS MUCH AS 
2.5 TO 3.5 INCHES OF RAIN FELL ACROSS PARTS OF THE WARNED AREA 
BETWEEN 730 AM AND 830 AM. STREET FLOODING HAS BEEN REPORTED IN 
WAUKON. FLASH FLOODING ON SMALLER CREEKS AND STREAMS IS EXPECTED TO 
BE ONGOING OR OCCUR SHORTLY.

EXCESSIVE RAINFALL OVER THE WARNED AREA WILL CAUSE MUD SLIDES NEAR
STEEP TERRAIN. THE MUD SLIDE CAN CONSIST OF ROCK...MUD...VEGETATION
AND OTHER LOOSE MATERIALS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

STAY AWAY OR BE SWEPT AWAY. RIVER BANKS AND CULVERTS CAN BECOME
UNSTABLE AND UNSAFE.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4308 9161 4321 9208 4350 9208 4350 9122
      4346 9123 4342 9120 4342 9067 4315 9071
      4299 9106 4300 9114 4276 9161

$$

RRS

112 
WGUS73 KARX 221616
FFSARX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1116 AM CDT MON JUN 22 2015

IAC005-043-191-WIC023-221621-
/O.EXP.KARX.FF.W.0005.000000T0000Z-150622T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLAYTON IA-ALLAMAKEE IA-WINNESHIEK IA-CRAWFORD WI-
1116 AM CDT MON JUN 22 2015

...THE FLASH FLOOD WARNING FOR NORTHWESTERN CLAYTON...ALLAMAKEE...
WINNESHIEK AND CRAWFORD COUNTIES WILL EXPIRE AT 1115 AM CDT...

THE THREAT OF FLASH FLOODING HAS ENDED NOW THAT THE RAIN HAS 
STOPPED. HOWEVER...RIVERS AND STREAMS SUCH AS THE UPPER IOWA RIVER 
AND BLOODY RUN CREEK ARE RUNNING HIGH AS RUNOFF FROM THE RAIN FLOWS 
INTO THEM. THIS RUNOFF MAY CAUSE BRIEF FLOODING NEAR RIVERS AND 
STREAMS.

ADDITIONALLY...PLEASE CONTINUE TO HEED ANY ROAD CLOSURES. 

LAT...LON 4308 9161 4321 9208 4350 9208 4350 9122
      4346 9123 4342 9120 4342 9067 4315 9071
      4299 9106 4300 9114 4276 9161

$$

AJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 6:54 AM CDT	Severe Thunderstorm Warning	ARX	Crawford	66 min
Jun 22, 7:55 AM CDT	Special Weather Statement	ARX	Grant	80 min
Jun 22, 8:27 AM CDT	Severe Thunderstorm Warning	ARX	Crawford	33 min
Jun 22, 8:40 AM CDT	Severe Thunderstorm Warning	ARX	Grant, Richland	50 min
Jun 22, 6:41 PM CDT	Special Weather Statement	ARX	Taylor	49 min
Jun 22, 6:04 AM CDT	Special Weather Statement	ARX	Chickasaw, Floyd, Howard, Mitchell, Winneshiek	56 min
Jun 22, 6:33 AM CDT	Severe Thunderstorm Warning	ARX	Mitchell	42 min
Jun 22, 6:46 AM CDT	Severe Thunderstorm Warning	ARX	Howard, Winneshiek	59 min
Jun 22, 6:55 AM CDT	Flash Flood Warning	ARX	Howard, Mitchell	4 hr
Jun 22, 7:58 AM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Clayton, Fayette	62 min
Jun 22, 7:58 AM CDT	Wind Advisory	ARX	Chickasaw, Floyd, Howard, Mitchell	3 hr
Jun 22, 9:26 AM CDT	River Flood Warning	ARX	Floyd	67 hr
Jun 22, 11:25 AM CDT	Areal Flood Advisory	ARX	Allamakee, Winneshiek	3 hr
Jun 22, 1:57 PM CDT	River Flood Warning	ARX	Allamakee	54 hr

Nearby

Flash Flood Warnings in Iowa, 2015 Flash Flood Warnings in Wisconsin, 2015 Every flash flood warning in 2015

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.