Alert archive / Iowa / Flash Flood Warnings in 2009

Flash Flood Warning 3, NWS La Crosse, WI

June 17, 2009Chickasaw County, Iowa

NWS La Crosse, WI issued this flash flood warning at Jun 17, 2009, 9:29 PM CDT for Chickasaw County, Iowa. 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: Jun 17, 2009, 9:29 PM CDT (02:29 UTC)
Expired: Jun 18, 2009, 12:30 AM CDT
In force: 3 hr
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Flood severity: None

County Chickasaw County, IA

The radar

The La Crosse radar (KARX), 122 km from the middle of the area, began a volume at 02:32 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 17, 11:00 PM CDT	FLASH FLOOD	1 N Lawler, IA	FEW INCHES OF WATER OVER ROADS IN SEVERAL LOCATIONS. MANY SPOTS ALONG N-S ROADS CR V56 AND VANDERBILT AVE...AS WELL AS ALONG W-E ROAD 190TH ST. ALSO REPORTS OF SOME WASHED OUT FARMERS DIKES IN THE AREA.

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, 2.5 hours before the alert went out and 212 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: 941 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 1354 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KARX 180229
FFWARX
IAC037-180530-
/O.NEW.KARX.FF.W.0003.090618T0229Z-090618T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
929 PM CDT WED JUN 17 2009

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CHICKASAW COUNTY IN NORTHEAST IOWA

* UNTIL 1230 AM CDT

* AT 926 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE      
  WARNED AREA. LAW ENFORCEMENT REPORT DITCHES BEGINNING TO FILL AND  
  RAPID RUNOFF. ANOTHER INCH OR TWO OF RAIN IS POSSIBLE ACROSS THE   
  EASTERN HALF OF CHICKASAW COUNTY THROUGH 11 PM. THIS MAY LEAD TO   
  FLASH FLOODING.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...NEW
  HAMPTON...FREDERICKSBURG...JERICO AND LAWLER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING WARNING MEANS THAT FLOODING IS IMMINENT OR
OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND
IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE
IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO
CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS. MOST FLOOD RELATED DEATHS OCCUR AT NIGHT. IF
FLOODING IS OBSERVED ACT QUICKLY.

&&

LAT...LON 4292 9242 4321 9245 4321 9209 4301 9208
      4300 9209 4292 9209

$$

BINAU

2 follow-up statements

000 
WGUS73 KARX 180321
FFSARX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1021 PM CDT WED JUN 17 2009

IAC037-180530-
/O.CON.KARX.FF.W.0003.000000T0000Z-090618T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHICKASAW IA-
1021 PM CDT WED JUN 17 2009

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR CHICKASAW COUNTY UNTIL
1230 AM CDT...

RADAR AT 1015 PM SHOWED MOST OF THE RAIN HAD ENDED OVER CHICKASAW 
COUNTY...BUT MORE ON THE WAY AS STORMS MOVE BACK IN FROM THE 
NORTHWEST. 

SLOW MOVING THUNDERSTORMS WILL PRODUCE VERY HEAVY RAINFALL IN THE 
WARNED AREA THROUGH MIDNIGHT. RUNOFF FROM THIS EXCESSIVE RAINFALL 
WILL CAUSE FLASH FLOODING TO OCCUR WITH ALL THE RAIN THAT HAS FALLEN 
THIS EVENING. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING 
INCLUDE...NEW HAMPTON...FREDERICKSBURG...JERICO AND LAWLER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY
MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN LA CROSSE.

&&

LAT...LON 4292 9242 4321 9245 4321 9209 4301 9208
      4300 9209 4292 9209

$$

BINAU

000 
WGUS73 KARX 180528
FFSARX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1228 AM CDT THU JUN 18 2009

IAC037-180543-
/O.EXP.KARX.FF.W.0003.000000T0000Z-090618T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHICKASAW IA-
1228 AM CDT THU JUN 18 2009

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR CHICKASAW COUNTY
WILL BE ALLOWED TO EXPIRE AT 1230 AM CDT...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 4292 9242 4321 9245 4321 9209 4301 9208
      4300 9209 4292 9209

$$

BINAU

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 7:25 PM CDT	Severe Thunderstorm Warning	ARX	Howard, Mitchell	65 min
Jun 17, 7:28 PM CDT	Tornado Warning	ARX	Floyd	47 min
Jun 17, 8:10 PM CDT	Tornado Warning	ARX	Chickasaw, Floyd	50 min
Jun 17, 8:29 PM CDT	Severe Thunderstorm Warning	ARX	Howard, Winneshiek	46 min
Jun 17, 8:52 PM CDT	Tornado Warning	ARX	Howard, Mitchell	53 min
Jun 17, 8:59 PM CDT	Tornado Warning	ARX	Chickasaw	46 min
Jun 17, 9:47 PM CDT	Severe Thunderstorm Warning	ARX	Howard	45 min
Jun 17, 9:50 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Fayette	25 min
Jun 17, 10:49 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Howard, Winneshiek	56 min
Jun 17, 11:31 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Fayette, Winneshiek	57 min
Jun 18, 12:12 AM CDT	Severe Thunderstorm Warning	ARX	Fayette	34 min

Nearby

Flash Flood Warnings in Iowa, 2009 Every flash flood warning in 2009

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.