Alert archive / Iowa / Flash Flood Warnings in 2016

Flash Flood Warning 7, NWS La Crosse, WI

July 17, 2016Chickasaw County, Floyd County, Howard County, Iowa

NWS La Crosse, WI issued this flash flood warning at Jul 17, 2016, 2:44 AM CDT for Chickasaw County, Floyd County, Howard County, Iowa. 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: Jul 17, 2016, 2:44 AM CDT (07:44 UTC)
Expired: Jul 17, 2016, 6:45 AM CDT
In force: 4 hr
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Flood severity: None

Counties Chickasaw County, IA, Floyd County, IA, Howard County, IA

The radar

The La Crosse radar (KARX), 134 km from the middle of the area, began a volume at 07:47 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 17, 3:55 AM CDT	HEAVY RAIN 1.62	3 E Charles City, IA	AWOS STATION CHARLES CITY AIRPORT /CCY/ 1 HOUR RAINFALL.
Jul 17, 5:45 AM CDT	HEAVY RAIN 2.29	2 Sse Bassett, IA	CO-OP OBSERVER STATION IONIA 2W /IONI4/.
Jul 17, 5:49 AM CDT	HEAVY RAIN 2.38	4 Ne Riceville, IA	MESONET STATION 3 NE RICEVILLE /E4652/.
Jul 17, 6:55 AM CDT	HEAVY RAIN 2.26	3 E Charles City, IA	AWOS STATION CHARLES CITY AIRPORT /CCY/.

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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 7.7 hours before the alert went out and 199 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: 4 J/kg
Mixed-layer CIN: -246 J/kg
Mixed-layer LCL: 1397 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

780 
WGUS53 KARX 170744
FFWARX
IAC037-067-089-171145-
/O.NEW.KARX.FF.W.0007.160717T0744Z-160717T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
244 AM CDT SUN JUL 17 2016

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CHICKASAW COUNTY IN NORTHEASTERN IOWA...
  HOWARD COUNTY IN NORTHEASTERN IOWA...
  FLOYD COUNTY IN NORTH CENTRAL IOWA...

* UNTIL 645 AM CDT

* AT 243 AM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. RAINFALL AMOUNTS OF 1 TO 2
  INCHES HAVE ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN
  SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CHARLES CITY...CRESCO...NEW HAMPTON...NASHUA...NORA SPRINGS...
  FREDERICKSBURG...ROCKFORD...RICEVILLE...ELMA...LIME SPRINGS...
  LAWLER...RUDD...FLOYD...MARBLE ROCK...IONIA...PROTIVIN...JERICO...
  CHICKASAW...ALTA VISTA AND CHESTER.

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 4321 9302 4321 9255 4350 9255 4350 9208
      4291 9208 4291 9303

$$

WETENKAMP

2 follow-up statements

157 
WGUS73 KARX 170822
FFSARX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
322 AM CDT SUN JUL 17 2016

IAC037-067-089-171145-
/O.CON.KARX.FF.W.0007.000000T0000Z-160717T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHICKASAW IA-HOWARD IA-FLOYD IA-
322 AM CDT SUN JUL 17 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 AM CDT FOR
CHICKASAW...HOWARD AND FLOYD COUNTIES...

AT 322 AM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN ACROSS THE WARNED AREA. 1 TO 3 INCHES OF RAIN HAVE
FALLEN. FLASH FLOODING IS EXPECTED. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
CHARLES CITY...CRESCO...NEW HAMPTON...NASHUA...NORA SPRINGS...
FREDERICKSBURG...ROCKFORD...RICEVILLE...ELMA...LIME SPRINGS...
LAWLER...RUDD...FLOYD...MARBLE ROCK...IONIA...PROTIVIN...JERICO...
CHICKASAW...ALTA VISTA AND CHESTER.

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 4321 9302 4321 9255 4350 9255 4350 9208
      4291 9208 4291 9303

$$

WETENKAMP

788 
WGUS73 KARX 171057
FFSARX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
557 AM CDT SUN JUL 17 2016

IAC037-067-089-171106-
/O.CAN.KARX.FF.W.0007.000000T0000Z-160717T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHICKASAW IA-HOWARD IA-FLOYD IA-
557 AM CDT SUN JUL 17 2016

...THE FLASH FLOOD WARNING FOR CHICKASAW...HOWARD AND FLOYD COUNTIES
IS CANCELLED...

THE HEAVY RAINFALL HAS ENDED ACROSS THE AREA. WHILE THERE MAY STILL
BE SOME AREAS WHERE WATER IS PONDED IN LOW SPOTS AND CREEKS ARE
RUNNING HIGH, SIGNIFICANT FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES AND STAY
OUT OF ANY FLOODED AREAS. 

LAT...LON 4321 9302 4321 9255 4350 9255 4350 9208
      4291 9208 4291 9303

$$

MW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 12:16 AM CDT	Severe Thunderstorm Warning	ARX	Mitchell	59 min
Jul 17, 12:51 AM CDT	Flash Flood Watch	ARX	Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more	6 hr
Jul 17, 12:58 AM CDT	Special Weather Statement	ARX	Howard	32 min
Jul 17, 1:47 AM CDT	Flash Flood Warning	ARX	Mitchell	3 hr
Jul 17, 2:06 AM CDT	Special Weather Statement	ARX	Chickasaw, Floyd, Howard, Winneshiek	39 min
Jul 17, 4:25 AM CDT	Special Weather Statement	ARX	Allamakee, Clayton, Fayette, Winneshiek	80 min
Jul 17, 11:36 AM CDT	Special Weather Statement	ARX	Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more	54 min

Nearby

Flash Flood Warnings in Iowa, 2016 Every flash flood warning in 2016

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.