Alert archive / Iowa / Flash Flood Warnings in 2015

Flash Flood Warning 7, NWS Sioux Falls, SD

July 28, 2015Cherokee County, Ida County, Woodbury County, Iowa

NWS Sioux Falls, SD issued this flash flood warning at Jul 28, 2015, 6:54 AM CDT for Cherokee County, Ida County, Woodbury 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: Jul 28, 2015, 6:54 AM CDT (11:54 UTC)
Expired: Jul 28, 2015, 10:00 AM CDT
In force: 3 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

Counties Cherokee County, IA, Ida County, IA, Woodbury County, IA

The radar

The Sioux Falls radar (KFSD), 141 km from the middle of the area, began a volume at 11:58 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 28, 7:50 AM CDT	FLASH FLOOD	Hornick, IA	FLASH FLOODING OF ROADS NEAR HIGHWAY 141 AND K64.

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

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 11.9 hours before the alert went out and 145 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: 878 J/kg
Mixed-layer CIN: -168 J/kg
Mixed-layer LCL: 1386 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 220 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

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

380 
WGUS53 KFSD 281154
FFWFSD
IAC035-093-193-281500-
/O.NEW.KFSD.FF.W.0007.150728T1154Z-150728T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
654 AM CDT TUE JUL 28 2015

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WOODBURY COUNTY IN WEST CENTRAL IOWA...
  CHEROKEE COUNTY IN NORTHWESTERN IOWA...
  IDA COUNTY IN WEST CENTRAL IOWA...

* UNTIL 1000 AM CDT
    
* AT 653 AM CDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO THREE INCHES OF RAIN HAVE
  ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CHEROKEE...IDA GROVE...MOVILLE...HOLSTEIN...MARCUS...AURELIA...
  SLOAN...LAWTON...CORRECTIONVILLE...BATTLE CREEK...ANTHON...GALVA...
  PIERSON...DANBURY...QUIMBY...WASHTA...CLEGHORN...HORNICK...
  SMITHLAND AND CUSHING.

ADDITIONAL RAINFALL AMOUNTS OF AN INCH IS POSSIBLE IN THE WARNED 
AREA.

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.

&&

LAT...LON 4256 9619 4256 9586 4290 9586 4291 9539
      4248 9539 4247 9534 4221 9532 4221 9626

$$

WEISSER

3 follow-up statements

165 
WGUS73 KFSD 281309
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
809 AM CDT TUE JUL 28 2015

IAC035-093-193-281500-
/O.CON.KFSD.FF.W.0007.000000T0000Z-150728T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WOODBURY IA-CHEROKEE IA-IDA IA-
809 AM CDT TUE JUL 28 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 AM CDT FOR
WOODBURY...CHEROKEE AND IDA COUNTIES...

AT 750 AM CDT...EMERGENCY MANAGEMENT REPORTED FLASH FLOODING OF 
ROADS IN HORNICK. WHILE RAINFALL WAS BEGINNIGN TO DECREASE IN 
INTENSITY...RADAR ESTIMATES OF RAIN THAT HAS FALLEN WERE UP TO 5 
INCHES IN CENTRAL WOODBURY COUNTY. FLASH FLOODING IS ALREADY 
OCCURRING AND WAS LIKELY AT OTHER PLACES IN THE AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4256 9619 4256 9586 4290 9586 4291 9539
      4248 9539 4247 9534 4221 9532 4221 9626

$$

WILLIAMS

715 
WGUS73 KFSD 281324 CCA
FFSFSD

FLASH FLOOD STATEMENT...CORRECTION
NATIONAL WEATHER SERVICE SIOUX FALLS SD
809 AM CDT TUE JUL 28 2015

IAC035-093-193-281500-
/O.CON.KFSD.FF.W.0007.000000T0000Z-150728T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WOODBURY IA-CHEROKEE IA-IDA IA-
809 AM CDT TUE JUL 28 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 AM CDT FOR
WOODBURY...CHEROKEE AND IDA COUNTIES...

AT 750 AM CDT...EMERGENCY MANAGEMENT REPORTED FLASH FLOODING OF 
ROADS IN HORNICK. WHILE RAINFALL WAS BEGINNING TO DECREASE IN 
INTENSITY...RADAR ESTIMATES OF RAIN THAT HAS FALLEN WERE UP TO 5 
INCHES IN CENTRAL WOODBURY COUNTY. FLASH FLOODING IS ALREADY 
OCCURRING AND WAS LIKELY AT OTHER PLACES IN THE AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4256 9619 4256 9586 4290 9586 4291 9539
      4248 9539 4247 9534 4221 9532 4221 9626

$$

WILLIAMS

229 
WGUS73 KFSD 281349
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
849 AM CDT TUE JUL 28 2015

IAC035-093-193-281500-
/O.CON.KFSD.FF.W.0007.000000T0000Z-150728T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WOODBURY IA-CHEROKEE IA-IDA IA-
849 AM CDT TUE JUL 28 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 AM CDT FOR
WOODBURY...CHEROKEE AND IDA COUNTIES...

FLASH FLOODING WAS REPORTED AT HORNICK THIS MORNING BY EMERGENCY 
MANAGEMENT. AT 848 AM CDT THUNDERSTORMS HAD RAPIDLY DECREASED TO 
ISOLATED LIGHT SHOWERS. HOWEVER...RUNOFF FROM THE HEAVY RAINS 
CONTINUED AND SMALL STREAMS WERE STILL RISING. OTHER UNREPORTED ROAD 
FLOODING MAY BE OCCURING. 
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4256 9619 4256 9586 4290 9586 4291 9539
      4248 9539 4247 9534 4221 9532 4221 9626

$$

WILLIAMS

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 28, 8:55 AM CDT	River Flood Warning	FSD	Monona, Woodbury	49 hr

Nearby

Flash Flood Warnings in Iowa, 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.