Alert archive / Iowa / Flood Watches in 2025

Flood Watch 2, NWS Sioux Falls, SD

July 10, 2025Ida County, Woodbury County, Iowa

NWS Sioux Falls, SD issued this flood watch at Jul 10, 2025, 1:29 PM CDT for Ida County, Woodbury County, Iowa. It took effect at Jul 10, 2025, 7:00 PM CDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Jul 10, 2025, 1:29 PM CDT (18:29 UTC)
In effect from: Jul 10, 2025, 7:00 PM CDT
Expired: Jul 11, 2025, 7:00 AM CDT
In force: 12 hr
Issued by: NWS Sioux Falls, SD
Flood severity: None

Counties Ida County, IA, Woodbury County, IA

The radar

The Omaha radar (KOAX), 128 km from the middle of the area, began a volume at 18:30 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, 6.5 hours before the alert went out and 325 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: 314 J/kg
Mixed-layer CIN: -140 J/kg
Mixed-layer LCL: 1061 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before this flood watch went out at Jul 10, 12:53 PM CDT, 36 minutes earlier.

Area forecast discussion, Jul 10, 12:53 PM CDT, 36 minutes before

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Hazardous weather outlook, Jul 10, 3:39 AM CDT, 9 hours 50 minutes before

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
339 AM CDT Thu Jul 10 2025

IAZ012>014-020>022-031-032-NEZ013-014-SDZ069>071-110845-
Sioux-O'Brien-Clay-Plymouth-Cherokee-Buena Vista-Woodbury-Ida-Dixon-
Dakota-Yankton-Union-
339 AM CDT Thu Jul 10 2025

This Hazardous Weather Outlook is for northwest Iowa, west central
Iowa, northeast Nebraska and southeast South Dakota.

.DAY ONE...Today and tonight.

Scattered strong to severe storms are expected to develop near to
south of U.S. Highway 18 in the late afternoon and continue through
this evening. The primary threats are golf ball size hail and a few
damaging wind gusts to 70 mph. Lower probability threats include an
isolated tornado and hail larger than 2 inches. Heavy downpours may
also result in localized urban flooding and rises on small streams.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Isolated strong to severe storms will be possible again Friday
afternoon and evening. Hail to the size of half dollars and wind
gusts to 60 mph are the main threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed between 5 pm and 11 pm.

IAZ001>003-MNZ071-072-080-081-089-090-097-098-SDZ038>040-050-052>068-
110845-
Lyon-Osceola-Dickinson-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Beadle-Kingsbury-Brookings-Gregory-Jerauld-Sanborn-
Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-Minnehaha-
Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-
339 AM CDT Thu Jul 10 2025

This Hazardous Weather Outlook is for northwest Iowa, southwest
Minnesota, central South Dakota, east central South Dakota, south
central South Dakota and southeast South Dakota.

.DAY ONE...Today and tonight.

Scattered showers and thunderstorms will be possible this afternoon.
The risk of severe weather is low; however, an isolated strong to
severe storm may produce wind gusts up to 60 MPH or hail up to
half dollar size.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Isolated strong to severe storms will be possible again Friday
afternoon and evening. Hail to the size of half dollars and wind
gusts to 60 mph are the main threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Jul 10, 12:59 PM CDT, 30 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
1259 PM CDT Thu Jul 10 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1045 PM     Hail             Tyndall                 42.99N 97.87W
07/09/2025  M1.00 Inch       Bon Homme          SD   CO-OP Observer

&&

Dux

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 8:35 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Brule, Charles Mix, Gregory	55 min
Jul 9, 9:30 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Beadle, Brule, Jerauld, Sanborn	90 min
Jul 9, 9:30 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Douglas, Gregory	75 min
Jul 9, 10:48 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Brookings, Davison, Hanson, Kingsbury, Lake and 3 more	57 min
Jul 9, 11:00 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Hutchinson, Turner, Yankton	45 min
Jul 9, 11:31 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Hutchinson, Lake, Lincoln, McCook, Miner and 3 more	59 min
Jul 10, 12:13 AM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	47 min
Jul 10, 12:37 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	53 min
Jul 10, 1:01 AM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	16 min
Jul 10, 1:30 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln	30 min

Nearby

Flood Watches in Iowa, 2025 Every flood watch in 2025

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.