Alert archive / Iowa / Flash Flood Warnings in 2016

Flash Flood Warning 5, NWS Sioux Falls, SD

May 23, 2016Osceola County, Iowa

NWS Sioux Falls, SD issued this flash flood warning at May 23, 2016, 6:09 PM CDT for Osceola County, Iowa. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 23, 2016, 6:09 PM CDT (23:09 UTC)
Expired: May 23, 2016, 10:15 PM CDT
In force: 4 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

County Osceola County, IA

The radar

The Sioux Falls radar (KFSD), 98 km from the middle of the area, began a volume at 23:10 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.2 hours before the alert went out and 226 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1408 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

819 
WGUS53 KFSD 232309
FFWFSD
IAC143-240315-
/O.NEW.KFSD.FF.W.0005.160523T2309Z-160524T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
609 PM CDT MON MAY 23 2016

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL OSCEOLA COUNTY IN NORTHWESTERN IOWA...

* UNTIL 1015 PM CDT

* AT 608 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. RAINFALL AMOUNTS GREATER THAN
  THREE INCHES MAY BE POSSIBLE.  FLASH FLOODING IS EXPECTED TO BEGIN
  SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  OCHEYEDAN...ASHTON...MELVIN AND HARRIS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4326 9553 4326 9583 4350 9563 4350 9539
      4347 9539

$$

DUX

1 follow-up statement

147 
WGUS73 KFSD 240310
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1010 PM CDT MON MAY 23 2016

IAC143-240320-
/O.EXP.KFSD.FF.W.0005.000000T0000Z-160524T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
OSCEOLA IA-
1010 PM CDT MON MAY 23 2016

...THE FLASH FLOOD WARNING FOR CENTRAL OSCEOLA COUNTY WILL EXPIRE AT
1015 PM CDT...

HEAVY RAIN HAS ENDED AND FLOOD WATERS CONTINUE TO RECEDE. WHILE
FLASH FLOODING WILL NOT CONTINUE OVERNIGHT...PONDING OF WATER MAY
CONTINUE INTO TUESDAY MORNING AND RISES WILL OCCUR IN AREA STREAMS
AND CREEKS. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 4326 9553 4326 9583 4350 9563 4350 9539
      4347 9539

$$

DUX

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 4:27 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Woodbury	33 min
May 23, 5:22 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	23 min
May 23, 5:25 PM CDT	Flash Flood Warning	FSD	O'Brien, Plymouth, Sioux	4 hr
May 23, 5:29 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, O'Brien, Osceola, Sioux	46 min
May 23, 5:39 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	36 min
May 23, 5:58 PM CDT	Flash Flood Warning	FSD	Plymouth, Sioux	4 hr
May 23, 6:06 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Osceola	39 min
May 23, 6:23 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Plymouth	37 min
May 23, 6:49 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Clay, O'Brien	23 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.