Alert archive / Iowa / Flash Flood Warnings in 2018

Flash Flood Warning 6, NWS Sioux Falls, SD

June 24, 2018Dickinson County, Osceola County, Iowa; Jackson County, Nobles County, Minnesota

NWS Sioux Falls, SD issued this flash flood warning at Jun 24, 2018, 4:52 PM CDT for Dickinson County, Osceola County, Iowa; Jackson County, Nobles County, Minnesota. It was in force for 4 hr. 5 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: Jun 24, 2018, 4:52 PM CDT (21:52 UTC)
Expired: Jun 24, 2018, 8:45 PM CDT
In force: 4 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Emergency: Flash flood emergency
Flood severity: None

Counties Dickinson County, IA, Osceola County, IA, Jackson County, MN, Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 121 km from the middle of the area, began a volume at 21:52 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
Jun 24, 5:19 PM CDT	FLASH FLOOD	Lake Park, IA	STREET FLOODING IN LAKE PARK PER SOCIAL MEDIA VIDEO.
Jun 24, 5:37 PM CDT	HEAVY RAIN 3.3	3 Nw Lake Park, IA	THE DURATION OF THE HEAVY RAIN EVENT WAS 1 HOUR.
Jun 24, 5:38 PM CDT	FLASH FLOOD	3 Ese Lake Park, IA	HIGHWAY 9 BLOCKED BETWEEN 150TH AND 160TH.
Jun 24, 6:00 PM CDT	HEAVY RAIN 1.84	3 Nnw Wahpeton, IA	THE DURATION OF THE HEAVY RAIN EVENT WAS 2 HOURS.
Jun 24, 8:45 PM CDT	HEAVY RAIN 4.05	2 E Lake Park, IA	THE DURATION OF THE HEAVY RAIN EVENT WAS 4 HOURS.

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 12:00Z, 9.9 hours before the alert went out and 195 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: 216 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 1065 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: 61 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

209 
WGUS53 KFSD 242152
FFWFSD
IAC059-143-MNC063-105-250145-
/O.NEW.KFSD.FF.W.0006.180624T2152Z-180625T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Sioux Falls SD
452 PM CDT SUN JUN 24 2018

The National Weather Service in Sioux Falls has issued a

* Flash Flood Warning for...
  Northeastern Osceola County in northwestern Iowa...
  Northern Dickinson County in northwestern Iowa...
  Southwestern Jackson County in southwestern Minnesota...
  Southeastern Nobles County in southwestern Minnesota...

* Until 845 PM CDT.

* At 452 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...
  Spirit Lake, Lake Park, Okoboji, Orleans, Ocheyedan, Round Lake,
  Wahpeton, Harris and Superior.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.

&&

LAT...LON 4366 9511 4338 9491 4338 9557 4366 9545

$$

Weisser

1 follow-up statement

500 
WGUS73 KFSD 242315
FFSFSD

Flash Flood Statement
National Weather Service Sioux Falls SD
615 PM CDT SUN JUN 24 2018

IAC059-143-MNC063-105-250145-
/O.CON.KFSD.FF.W.0006.000000T0000Z-180625T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Osceola IA-Dickinson IA-Jackson MN-Nobles MN-
615 PM CDT SUN JUN 24 2018

...THIS IS A FLASH FLOOD EMERGENCY FOR DICKINSON COUNTY...

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR
NORTHEASTERN OSCEOLA...NORTHERN DICKINSON...SOUTHWESTERN JACKSON AND
SOUTHEASTERN NOBLES COUNTIES...

At 614 PM CDT, Doppler radar indicated heavy rain across the warned 
area.  Flash flooding is already occurring. An estimated total of 3 
to 6 inches of rain will fall.

This is a FLASH FLOOD EMERGENCY for very heavy rain. This is a 
PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!

Some locations that will experience flooding include...
Spirit Lake, Lake Park, Okoboji, Orleans, Ocheyedan, Round Lake,
Wahpeton, Harris and Superior.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.

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

In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.

Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.

&&

LAT...LON 4366 9511 4338 9491 4338 9557 4366 9545

$$

Weisser

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 4:03 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	27 min
Jun 24, 4:46 PM CDT	Flash Flood Warning	FSD	Cherokee, O'Brien, Plymouth, Sioux	4 hr
Jun 24, 5:01 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson	44 min
Jun 24, 5:26 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Dickinson	49 min
Jun 24, 5:29 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Dickinson	46 min
Jun 24, 5:36 PM CDT	Flash Flood Warning Emergency	FSD	Clay, Dickinson, O'Brien, Osceola	3 hr
Jun 24, 6:18 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista, Clay	42 min
Jun 24, 4:54 AM CDT	River Flood Warning	FSD	Cottonwood, Jackson	28 days
Jun 24, 4:54 AM CDT	River Flood Warning	FSD	Lyon	4 days
Jun 24, 3:44 PM CDT	Tornado Warning	FSD	Lincoln, Lyon	31 min
Jun 24, 4:14 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Lyon, Murray	28 min
Jun 24, 5:04 PM CDT	Tornado Warning	FSD	Murray	26 min
Jun 24, 5:32 PM CDT	Tornado Warning	FSD	Murray	29 min
Jun 24, 5:54 PM CDT	Flash Flood Warning	FSD	Murray	3 hr

Nearby

Flash Flood Warnings in Iowa, 2018 Flash Flood Warnings in Minnesota, 2018 Every flash flood warning in 2018

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.