Alert archive / Iowa / Flash Flood Warnings in 2024

Flash Flood Warning 13, NWS Des Moines, IA

June 22, 20244 counties in Iowa

NWS Des Moines, IA issued this flash flood warning at Jun 22, 2024, 12:24 AM CDT for 4 counties in Iowa. It was in force for 6 hr. 2 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 22, 2024, 12:24 AM CDT (05:24 UTC)
Expired: Jun 22, 2024, 6:04 AM CDT
In force: 6 hr
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: None

Counties Humboldt County, IA, Kossuth County, IA, Pocahontas County, IA, Winnebago County, IA

The radar

The Des Moines radar (KDMX), 159 km from the middle of the area, began a volume at 05:26 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 22, 4:10 AM CDT	RAIN 2.66	Algona, IA	Mesonet station ALGIA Algona.
Jun 22, 6:00 AM CDT	RAIN 3.3	1 Nw Burt, IA	Cocorahs station IA-KS-5 Burt 0.5 NW. 3.30 inches.

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 00:00Z, 5.4 hours before the alert went out and 200 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: 583 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

772 
WGUS53 KDMX 220524
FFWDMX
IAC091-109-151-189-221130-
/O.NEW.KDMX.FF.W.0013.240622T0524Z-240622T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Des Moines IA
1224 AM CDT Sat Jun 22 2024

The National Weather Service in Des Moines has issued a

* Flash Flood Warning for...
  Northern Humboldt County in north central Iowa...
  Kossuth County in north central Iowa...
  Winnebago County in north central Iowa...
  Northern Pocahontas County in northwestern Iowa...

* Until 630 AM CDT Saturday.

* At 1224 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. The expected rainfall rate is 2 
  to 3 inches in 1 hour. Flash flooding is ongoing or expected to 
  begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Algona, Lake Mills, Laurens, Union Slogh, Buffalo Center, West 
  Bend, Bancroft, Rolfe, Burt, Whittemore, Thompson, Titonka, 
  Wesley, Livermore, Corwith, Bode, Fenton, Lu Verne, Lakota and 
  Rake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For the latest river and stream observations and forecasts refer to 
weather.gov/desmoines/water.

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

&&

LAT...LON 4291 9491 4291 9444 4325 9444 4350 9400
      4350 9350 4342 9350 4326 9387 4326 9397
      4289 9397 4277 9430 4276 9491

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...2-3 INCHES IN 1 HOUR

$$

Lee

2 follow-up statements

379 
WGUS73 KDMX 220742
FFSDMX

Flash Flood Statement
National Weather Service Des Moines IA
242 AM CDT Sat Jun 22 2024

IAC091-109-151-189-221130-
/O.CON.KDMX.FF.W.0013.000000T0000Z-240622T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Humboldt IA-Kossuth IA-Pocahontas IA-Winnebago IA-
242 AM CDT Sat Jun 22 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 AM CDT THIS 
MORNING FOR NORTHERN HUMBOLDT, KOSSUTH, WINNEBAGO AND NORTHERN 
POCAHONTAS COUNTIES...

At 242 AM CDT, Doppler radar indicated that the heaviest rain has 
moved out of the area, however, light to moderate rain is still 
falling and waters may continue to rise. Flash flooding may still be 
ongoing.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Algona, Lake Mills, Laurens, Union Slogh, Buffalo Center, West 
  Bend, Bancroft, Rolfe, Burt, Whittemore, Thompson, Titonka, 
  Wesley, Livermore, Corwith, Bode, Fenton, Lu Verne, Lakota and 
  Rake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

For the latest river and stream observations and forecasts refer to 
weather.gov/desmoines/water.

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

&&

LAT...LON 4291 9491 4291 9444 4325 9444 4350 9400
      4350 9350 4342 9350 4326 9387 4326 9397
      4289 9397 4277 9430 4276 9491

FLASH FLOOD...RADAR INDICATED

$$

Lee

883 
WGUS73 KDMX 221104
FFSDMX

Flash Flood Statement
National Weather Service Des Moines IA
604 AM CDT Sat Jun 22 2024

IAC091-109-151-189-221114-
/O.CAN.KDMX.FF.W.0013.000000T0000Z-240622T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Humboldt IA-Kossuth IA-Pocahontas IA-Winnebago IA-
604 AM CDT Sat Jun 22 2024

...FLASH FLOOD WARNING FOR NORTHERN HUMBOLDT, KOSSUTH, WINNEBAGO AND 
NORTHERN POCAHONTAS COUNTIES HAS BEEN REPLACED WITH A FLOOD 
WARNING...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

A Flood Watch remains in effect until 100 PM CDT Saturday for 
portions of central, north central, northeast, northwest, and west 
central Iowa.

A Flood Watch remains in effect until 100 PM CDT Saturday for 
portions of north central and northwest Iowa.

&&

LAT...LON 4291 9491 4291 9444 4325 9444 4350 9400
      4350 9350 4342 9350 4326 9387 4326 9397
      4289 9397 4277 9430 4276 9491

$$

Lee

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 21, 9:30 PM CDT	River Flood Warning	DMX	Cerro Gordo, Floyd, Worth	4 days
Jun 21, 10:46 PM CDT	Flash Flood Warning	DMX	Emmet, Kossuth	6 hr
Jun 21, 11:35 PM CDT	Special Weather Statement	DMX	Palo Alto	40 min
Jun 21, 11:41 PM CDT	Flash Flood Warning	DMX	Palo Alto	6 hr
Jun 22, 1:02 AM CDT	Flash Flood Warning Considerable damage threat	DMX	Cerro Gordo, Hancock, Winnebago, Worth	6 hr
Jun 22, 1:36 AM CDT	Flash Flood Warning Considerable damage threat	DMX	Cerro Gordo, Hancock	5 hr
Jun 22, 1:49 AM CDT	Special Weather Statement	DMX	Cerro Gordo, Worth	26 min
Jun 22, 4:51 AM CDT	Areal Flood Warning	DMX	Emmet, Kossuth	6 hr
Jun 22, 5:52 AM CDT	Areal Flood Warning	DMX	Palo Alto	5 hr
Jun 22, 6:04 AM CDT	Areal Flood Warning	DMX	Humboldt, Kossuth, Pocahontas, Winnebago	6 hr
Jun 22, 6:43 AM CDT	Areal Flood Warning	DMX	Cerro Gordo, Hancock, Winnebago, Worth	6 hr
Jun 22, 6:43 AM CDT	Areal Flood Warning	DMX	Cerro Gordo, Hancock	6 hr
Jun 22, 10:54 AM CDT	Areal Flood Warning	DMX	Emmet, Palo Alto	12 hr
Jun 22, 11:42 AM CDT	River Flood Warning	DMX	Boone, Hamilton, Webster	21 days
Jun 22, 11:42 AM CDT	River Flood Warning	DMX	Humboldt	5 days
Jun 22, 11:46 AM CDT	River Flood Warning	DMX	Black Hawk, Bremer, Butler	6 days
Jun 22, 11:51 AM CDT	River Flood Warning	DMX	Black Hawk	16 days
Jun 22, 11:51 AM CDT	River Flood Warning	DMX	Black Hawk, Bremer, Butler	4 days
Jun 22, 11:51 AM CDT	River Flood Warning	DMX	Black Hawk	6 days
Jun 22, 4:40 PM CDT	Tornado Warning	DMX	Black Hawk, Bremer	35 min

Nearby

Flash Flood Warnings in Iowa, 2024 Every flash flood warning in 2024

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.