Alert archive / Iowa / Flash Flood Warnings in 2019
Flash Flood Warning 9, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Jul 1, 2019, 9:28 PM CDT for 4 counties in Iowa; Dakota County, Dixon County, Nebraska; Union County, South Dakota. 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 1, 2019, 9:28 PM CDT (02:28 UTC)
- Expired
- Jul 2, 2019, 12:30 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, Plymouth County, IA, Woodbury County, IA, Dakota County, NE, Dixon County, NE, Union County, SD
The radar
The Omaha radar (KOAX), 118 km from the middle of the area, began a volume at 02:29 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 1, 10:17 PM CDT | FLASH FLOOD | 2 Wnw Sioux City, IA | SIOUX CITY POLICE ADVISED STREET FLOODING ON 19TH STREET BETWEEN ROSS AND CENTER STREET. MULTIPLE CARS STALLED IN STREET FLOODING ON FLOYD. |
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, 2.5 hours before the alert went out and 118 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.
- 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
The text
As transmitted.
297
WGUS53 KFSD 020228
FFWFSD
IAC035-093-149-193-NEC043-051-SDC127-020530-
/O.NEW.KFSD.FF.W.0009.190702T0228Z-190702T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Sioux Falls SD
928 PM CDT Mon Jul 1 2019
The National Weather Service in Sioux Falls has issued a
* Flash Flood Warning for...
Southern Cherokee County in northwestern Iowa...
Woodbury County in west central Iowa...
Southern Plymouth County in northwestern Iowa...
Western Ida County in west central Iowa...
Dakota County in northeastern Nebraska...
Dixon County in northeastern Nebraska...
Southern Union County in southeastern South Dakota...
* Until 1230 AM CDT.
* At 927 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...
Sioux City, Ponca, South Sioux City, Sergeant Bluff, North Sioux
City, Elk Point, Dakota City, Moville, Wakefield, Kingsley, Sloan,
Hinton, Lawton, Emerson, Correctionville, Anthon, Homer, Jefferson,
Allen and Pierson.
Additional rainfall amounts of one to three inches are possible in
the warned area.
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.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.
&&
LAT...LON 4222 9633 4225 9633 4228 9635 4227 9701
4261 9701 4271 9662 4268 9549 4221 9568
$$
Weisser1 follow-up statement
424
WGUS73 KFSD 020341
FFSFSD
Flash Flood Statement
National Weather Service Sioux Falls SD
1041 PM CDT Mon Jul 1 2019
IAC035-093-149-193-NEC043-051-SDC127-020530-
/O.CON.KFSD.FF.W.0009.000000T0000Z-190702T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cherokee IA-Woodbury IA-Plymouth IA-Ida IA-Dakota NE-Dixon NE-
Union SD-
1041 PM CDT Mon Jul 1 2019
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT FOR
SOUTHERN CHEROKEE...WOODBURY...SOUTHERN PLYMOUTH...WESTERN IDA...
DAKOTA...DIXON AND SOUTHERN UNION COUNTIES...
At 1040 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Two to three inches of rain has
already fallen. Flash flooding is expected to begin shortly.
Some locations that will experience flooding include...
Sioux City, Ponca, South Sioux City, Sergeant Bluff, North Sioux
City, Elk Point, Dakota City, Moville, Wakefield, Kingsley, Sloan,
Hinton, Lawton, Emerson, Correctionville, Anthon, Homer, Jefferson,
Allen and Pierson.
Additional rainfall amounts of one to three inches are possible in
the warned area.
At 1017 pm CDT...street flooding was reported in downtown Sioux City
with multiple stalled cars.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.
&&
LAT...LON 4222 9633 4225 9633 4228 9635 4227 9701
4261 9701 4271 9662 4268 9549 4221 9568
$$
WeisserThe 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, 7:33 PM CDT | Flash Flood Warning | FSD | O'Brien | 2 hr |
| Jul 1, 8:17 PM CDT | Flash Flood Warning | FSD | Cherokee, Plymouth, Sioux | 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 |
| Jul 2, 10:04 AM CDT | River Flood Warning | FSD | Brookings, Moody | 34 days |
Nearby
Flash Flood Warnings in Iowa, 2019Flash Flood Warnings in Nebraska, 2019Flash Flood Warnings in South Dakota, 2019Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.