Alert archive / Iowa / Flash Flood Warnings in 2019

Flash Flood Warning 7, NWS Sioux Falls, SD

July 1, 2019O'Brien County, Iowa

NWS Sioux Falls, SD issued this flash flood warning at Jul 1, 2019, 7:33 PM CDT for O'Brien County, Iowa. It was in force for 2 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: Jul 1, 2019, 7:33 PM CDT (00:33 UTC)
Expired: Jul 1, 2019, 9:56 PM CDT
In force: 2 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

County O'Brien County, IA

The radar

The Sioux Falls radar (KFSD), 108 km from the middle of the area, began a volume at 00:37 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

Omaha, NE (KOAX), launched 00:00Z, 0.6 hours before the alert went out and 201 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: 1037 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1798 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

986 
WGUS53 KFSD 020033
FFWFSD
IAC141-020330-
/O.NEW.KFSD.FF.W.0007.190702T0033Z-190702T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Sioux Falls SD
733 PM CDT Mon Jul 1 2019

The National Weather Service in Sioux Falls has issued a

* Flash Flood Warning for...
  O'Brien County in northwestern Iowa...

* Until 1030 PM CDT.

* At 732 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is expected to
  begin shortly.

* Some locations that will experience flooding include...
  Sheldon, Hartley, Sanborn, Paullina, Primghar, Sutherland, Archer,
  Calumet and Moneta.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4291 9585 4323 9586 4324 9539 4304 9538
      4291 9539

$$

Weisser

1 follow-up statement

348 
WGUS73 KFSD 020256
FFSFSD

Flash Flood Statement
National Weather Service Sioux Falls SD
956 PM CDT Mon Jul 1 2019

IAC141-020305-
/O.CAN.KFSD.FF.W.0007.000000T0000Z-190702T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
O'Brien IA-
956 PM CDT Mon Jul 1 2019

...THE FLASH FLOOD WARNING FOR O'BRIEN COUNTY IS CANCELLED...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. An additional half an inch of rain is possible through 11 pm 
CDT. The heavy rainfall is just south of O'Brien county and should 
be through about midnight. Please continue to heed any remaining 
road closures.

LAT...LON 4291 9585 4323 9586 4324 9539 4304 9538
      4291 9539

$$

Weisser

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 7:16 PM CDT	Flash Flood Warning	FSD	Sioux	3 hr
Jul 1, 8:17 PM CDT	Flash Flood Warning	FSD	Cherokee, Plymouth, Sioux	3 hr
Jul 1, 9:28 PM CDT	Flash Flood Warning	FSD	Cherokee, Ida, Plymouth, Woodbury	3 hr
Jul 1, 11:01 PM CDT	River Flood Warning	FSD	Lyon	3 days
Jul 1, 11:01 PM CDT	River Flood Warning	FSD	Sioux	21 days
Jul 1, 11:01 PM CDT	River Flood Warning	FSD	Sioux	22 hr
Jul 2, 3:46 AM CDT	River Flood Warning	FSD	Plymouth, Sioux	48 hr
Jul 2, 7:40 AM CDT	River Flood Warning	FSD	Plymouth, Sioux	7 days

Nearby

Flash Flood Warnings in Iowa, 2019 Every flash flood warning in 2019

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.