Alert archive / Iowa / Flash Flood Warnings in 2020

Flash Flood Warning 2, NWS Des Moines, IA

June 9, 2020Crawford County, Iowa

NWS Des Moines, IA issued this flash flood warning at Jun 9, 2020, 10:26 PM CDT for Crawford County, Iowa. It was in force for 6 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: Jun 9, 2020, 10:26 PM CDT (03:26 UTC)
Expired: Jun 10, 2020, 4:04 AM CDT
In force: 6 hr
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: None

County Crawford County, IA

The radar

The Omaha radar (KOAX), 114 km from the middle of the area, began a volume at 03:29 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.

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 3.4 hours before the alert went out and 342 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: 2849 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

012 
WGUS53 KDMX 100326
FFWDMX
IAC047-100930-
/O.NEW.KDMX.FF.W.0002.200610T0326Z-200610T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Des Moines IA
1026 PM CDT Tue Jun 9 2020

The National Weather Service in Des Moines  has issued a

* Flash Flood Warning for...
  Crawford County in west central Iowa...

* Until 430 AM CDT Wednesday.

* At 1026 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. A trained spotter reported 4.5 
  inches of rain since about 8 PM near Buck Grove and additional 
  heavy rain is likely. Flash flooding is ongoing or expected to 
  begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  IMPACT...Flooding of small creeks and streams, urban areas, 
           highways, streets and underpasses as well as other 
           drainage and low lying areas.

* Some locations that will experience flooding include...
  Denison, Schleswig, Manilla, Dow City, Charter Oak, Vail, Westside,
  Kiron, Deloit, Ricketts, Arion, Buck Grove, Aspinwall and Denison
  Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 4221 9567 4221 9509 4186 9510 4187 9567

FLASH FLOOD...RADAR INDICATED

$$

Podrazik

1 follow-up statement

520 
WGUS73 KDMX 100904
FFSDMX

Flash Flood Statement
National Weather Service Des Moines IA
404 AM CDT Wed Jun 10 2020

IAC047-100913-
/O.CAN.KDMX.FF.W.0002.000000T0000Z-200610T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Crawford IA-
404 AM CDT Wed Jun 10 2020

...THE FLASH FLOOD WARNING FOR CRAWFORD COUNTY IS CANCELLED...

There has been little additional rainfall and any water has 
receded.  However, more rain is possible this morning which may 
help to renew rises on area creeks and streams. Please continue to 
heed any remaining road closures.

LAT...LON 4221 9567 4221 9509 4186 9510 4187 9567

$$

Cogil

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 8:09 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Palo Alto, Pocahontas	51 min
Jun 9, 8:41 PM CDT	River Flood Warning	DMX	Black Hawk	38 hr
Jun 9, 8:42 PM CDT	River Flood Warning	DMX	Black Hawk	35 hr
Jun 9, 8:43 PM CDT	River Flood Warning	DMX	Davis, Wapello	8 hr
Jun 9, 9:23 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Cass	52 min
Jun 9, 9:30 PM CDT	Severe Thunderstorm Warning	DMX	Taylor	30 min
Jun 9, 9:48 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass, Union	42 min

Nearby

Flash Flood Warnings in Iowa, 2020 Every flash flood warning in 2020

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.