Alert archive / Iowa / Flash Flood Warnings in 2020

Flash Flood Warning 4, NWS Des Moines, IA

June 26, 2020Monroe County, Iowa

NWS Des Moines, IA issued this flash flood warning at Jun 26, 2020, 10:52 PM CDT for Monroe County, Iowa. It was in force for 5 hr. 1 report 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 26, 2020, 10:52 PM CDT (03:52 UTC)
Expired: Jun 27, 2020, 3:54 AM CDT
In force: 5 hr
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: None

County Monroe County, IA

The radar

The Des Moines radar (KDMX), 104 km from the middle of the area, began a volume at 03:54 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 26, 11:16 PM CDT	HEAVY RAIN 4.37	Albia, IA	PUBLIC REPORT VIA SOCIAL MEDIA OF HEAVY RAINFALL IN ALBIA, IA. 4.37 INCHES OF RAIN FELL BETWEEN 7:45 AND 11:00 PM. HEAVY RAINFALL IS STILL OCCURRING.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.9 hours before the alert went out and 213 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: 1679 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 1079 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

678 
WGUS53 KDMX 270352
FFWDMX
IAC135-270945-
/O.NEW.KDMX.FF.W.0004.200627T0352Z-200627T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Des Moines IA
1052 PM CDT Fri Jun 26 2020

The National Weather Service in Des Moines  has issued a

* Flash Flood Warning for...
  Monroe County in south central Iowa...

* Until 445 AM CDT.

* At 1052 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to three inches of rain have
  already fallen. 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...
  Albia, Melrose and Albia Municipal Airport. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4095 9310 4111 9310 4111 9264 4095 9264

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

$$

Podrazik

1 follow-up statement

326 
WGUS73 KDMX 270854
FFSDMX

Flash Flood Statement
National Weather Service Des Moines IA
354 AM CDT Sat Jun 27 2020

IAC135-270904-
/O.CAN.KDMX.FF.W.0004.000000T0000Z-200627T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe IA-
354 AM CDT Sat Jun 27 2020

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

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

LAT...LON 4095 9310 4111 9310 4111 9264 4095 9264

$$

Donavon

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 7:31 PM CDT	Special Weather Statement	DMX	Union	59 min
Jun 26, 7:38 PM CDT	Special Weather Statement	DMX	Wapello	52 min
Jun 26, 7:41 PM CDT	Special Weather Statement	DMX	Monroe	49 min
Jun 26, 8:50 PM CDT	Special Weather Statement	DMX	Monroe, Wapello	40 min
Jun 26, 8:53 PM CDT	Special Weather Statement	DMX	Clarke, Union	52 min
Jun 26, 9:08 PM CDT	Severe Thunderstorm Warning	DMX	Monroe	19 min
Jun 26, 10:13 PM CDT	Special Weather Statement	DMX	Monroe	62 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.