Alert archive / Iowa / Flash Flood Warnings in 2024

Flash Flood Warning 21, NWS Des Moines, IA

July 15, 20244 counties in Iowa

NWS Des Moines, IA issued this flash flood warning at Jul 15, 2024, 4:26 PM CDT for 4 counties in Iowa. It was in force for 4 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 15, 2024, 4:26 PM CDT (21:26 UTC)
Expired: Jul 15, 2024, 7:56 PM CDT
In force: 4 hr
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: None

Counties Franklin County, IA, Hamilton County, IA, Hardin County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 104 km from the middle of the area, began a volume at 21:30 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

Davenport, (KDVN), launched 12:00Z, 9.4 hours before the alert went out and 240 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: 1844 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 967 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

As transmitted.

650 
WGUS53 KDMX 152126
FFWDMX
IAC069-079-083-197-160330-
/O.NEW.KDMX.FF.W.0021.240715T2126Z-240716T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Des Moines IA
426 PM CDT Mon Jul 15 2024

The National Weather Service in Des Moines has issued a

* Flash Flood Warning for...
  Northeastern Hamilton County in central Iowa...
  Northern Hardin County in central Iowa...
  Southern Franklin County in north central Iowa...
  Southeastern Wright County in north central Iowa...

* Until 1030 PM CDT Monday.

* At 426 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 2.5 inches of 
  rain have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. 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...
  Iowa Falls, Hampton, Ackley, Alden, Dows, Williams, Steamboat 
  Rock, Coulter, Geneva, Rowan, Buckeye, Bradford, Popejoy, Owasa, 
  Iowa Falls Municipal Airport, Hampton Municipal Airport and Ackley 
  Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For the latest waterway 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 4276 9358 4271 9303 4269 9303 4263 9303
      4261 9303 4257 9303 4256 9303 4250 9303
      4249 9303 4247 9303 4247 9302 4247 9300
      4246 9300 4241 9300 4239 9300 4240 9359

FLASH FLOOD...RADAR INDICATED

$$

Zogg

3 follow-up statements

622 
WGUS73 KDMX 152223
FFSDMX

Flash Flood Statement
National Weather Service Des Moines IA
523 PM CDT Mon Jul 15 2024

IAC069-079-083-197-160330-
/O.CON.KDMX.FF.W.0021.000000T0000Z-240716T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Franklin IA-Hamilton IA-Hardin IA-Wright IA-
523 PM CDT Mon Jul 15 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT THIS 
EVENING FOR NORTHEASTERN HAMILTON, NORTHERN HARDIN, SOUTHERN 
FRANKLIN AND SOUTHEASTERN WRIGHT COUNTIES...

At 523 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 3 inches of rain have 
fallen. Additional rainfall amounts up to 1 inch are possible in the 
warned area. 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...
  Iowa Falls, Ackley, Alden, Williams, Steamboat Rock, Buckeye, 
  Popejoy, Owasa, Iowa Falls Municipal Airport and Ackley Municipal 
  Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For the latest waterway 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 4262 9358 4261 9303 4247 9303 4247 9300
      4246 9300 4241 9300 4239 9300 4240 9359

FLASH FLOOD...RADAR INDICATED

$$

Zogg

340 
WGUS73 KDMX 152315
FFSDMX

Flash Flood Statement
National Weather Service Des Moines IA
615 PM CDT Mon Jul 15 2024

IAC197-152325-
/O.CAN.KDMX.FF.W.0021.000000T0000Z-240716T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wright IA-
615 PM CDT Mon Jul 15 2024

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN WRIGHT COUNTY...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

&&

LAT...LON 4256 9358 4256 9352 4256 9350 4260 9350
      4262 9350 4260 9311 4243 9315 4240 9359

$$

IAC069-079-083-160330-
/O.CON.KDMX.FF.W.0021.000000T0000Z-240716T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Franklin IA-Hamilton IA-Hardin IA-
615 PM CDT Mon Jul 15 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT THIS 
EVENING FOR NORTHEASTERN HAMILTON, NORTHWESTERN HARDIN AND 
SOUTHWESTERN FRANKLIN COUNTIES...

At 615 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 3 inches of rain have 
fallen. Additional rainfall amounts up to 1 inch are possible in the 
warned area. 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...
  Iowa Falls, Alden, Williams, Buckeye, Popejoy, Owasa and Iowa 
  Falls Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For the latest waterway 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 4256 9358 4256 9352 4256 9350 4260 9350
      4262 9350 4260 9311 4243 9315 4240 9359

FLASH FLOOD...RADAR INDICATED

$$

Zogg

906 
WGUS73 KDMX 160056 RRA
FFSDMX

Flash Flood Statement
National Weather Service Des Moines IA
756 PM CDT Mon Jul 15 2024

IAC069-079-083-160106-
/O.CAN.KDMX.FF.W.0021.000000T0000Z-240716T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Franklin IA-Hamilton IA-Hardin IA-
756 PM CDT Mon Jul 15 2024

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN HAMILTON, 
NORTHWESTERN HARDIN AND SOUTHWESTERN FRANKLIN COUNTIES...

Flood waters have receded. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

&&

LAT...LON 4256 9358 4256 9352 4256 9350 4260 9350
      4262 9350 4260 9311 4243 9315 4240 9359

$$

Zogg

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 7:17 PM CDT	Special Weather Statement	DMX	Poweshiek	43 min
Jul 14, 8:44 PM CDT	Special Weather Statement	DMX	Black Hawk	31 min
Jul 14, 9:01 PM CDT	Special Weather Statement	DMX	Wapello	29 min
Jul 15, 3:08 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford, Sac	52 min
Jul 15, 3:28 PM CDT	Severe Thunderstorm Warning	DMX	Franklin, Hamilton, Hardin, Wright	47 min
Jul 15, 3:35 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Grundy, Tama	40 min
Jul 15, 3:57 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Audubon, Carroll, Crawford, Greene	48 min
Jul 15, 4:13 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Grundy, Hardin	47 min
Jul 15, 4:14 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Calhoun, Carroll, Crawford, Sac	46 min
Jul 15, 4:16 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Tama	29 min
Jul 15, 4:23 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Audubon, Carroll, Dallas, Greene, Guthrie	52 min
Jul 15, 4:44 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Greene	29 min
Jul 15, 4:50 PM CDT	Flash Flood Warning	DMX	Black Hawk, Grundy, Tama	3 hr
Jul 15, 5:01 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Jasper, Marshall, Polk, Story	29 min
Jul 15, 5:20 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Dallas, Guthrie, Madison, Polk	25 min
Jul 15, 5:29 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Jasper, Marion, Marshall, Polk, Story and 1 more	31 min
Jul 15, 5:42 PM CDT	Tornado Warning	DMX	Polk	10 min
Jul 15, 5:47 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	DMX	Polk, Warren	28 min
Jul 15, 6:00 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Jasper, Mahaska, Marion, Marshall, Polk, Poweshiek and 2 more	60 min
Jul 15, 6:24 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Jasper, Mahaska, Marion, Monroe, Poweshiek, Wapello	66 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.