Alert archive / Iowa / Flash Flood Warnings in 2016

Flash Flood Warning 18, NWS Des Moines, IA

August 10, 2016Dallas County, Iowa

NWS Des Moines, IA issued this flash flood warning at Aug 10, 2016, 5:25 PM CDT for Dallas County, 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
Aug 10, 2016, 5:25 PM CDT (22:25 UTC)
Expired
Aug 10, 2016, 11:30 PM CDT
In force
6 hr
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Flood severity
None

County Dallas County, IA

The radar

The Des Moines radar (KDMX), 19 km from the middle of the area, began a volume at 22:25 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

TimeReportWhereRemark
Aug 10, 5:58 PM CDTFLASH FLOOD5 Wnw Grimes, IAUP TO A FOOT OF WATER OVER THE ROAD ALONG HIGHWAY 44 ( 240TH STREET ) AND V AVENUE IN DALLAS COUNTY. .
Aug 10, 9:10 PM CDTHEAVY RAIN 3.62 Ene Dallas Center, IAPUBLIC REPORT OF 3.6 INCHES OF RAIN NE OF DALLAS CENTER. REPORT VIA SOCIAL MEDIA.

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

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.4 hours before the alert went out and 206 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-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 2016-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2010 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2016-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 121 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2010 J/kg
Mixed-layer CIN
-74 J/kg
Mixed-layer LCL
1074 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
121 m²/s²
0-3 km storm-relative helicity
136 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

505 
WGUS53 KDMX 102225
FFWDMX
IAC049-110430-
/O.NEW.KDMX.FF.W.0018.160810T2225Z-160811T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
525 PM CDT WED AUG 10 2016

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN DALLAS COUNTY IN CENTRAL IOWA...

* UNTIL 1130 PM CDT WEDNESDAY

* AT 524 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. AS MUCH AS TWO TO THREE INCHES
  OF RAIN HAS ALREADY FALLEN...AND AS MUCH AS 1 TO 1.5 INCHES OF
  RAIN IS EXPECTED OVER THE NEXT HOUR. FLASH FLOODING IS EXPECTED TO
  BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  URBANDALE...CLIVE...WAUKEE...GRIMES...ADEL...DALLAS CENTER...
  GRANGER AND MINBURN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4160 9403 4181 9403 4181 9382 4160 9381

$$

ZOGG
2 follow-up statements
211 
WGUS73 KDMX 102303
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
603 PM CDT WED AUG 10 2016

IAC049-110430-
/O.CON.KDMX.FF.W.0018.000000T0000Z-160811T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DALLAS IA-
603 PM CDT WED AUG 10 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT FOR
NORTHEASTERN DALLAS COUNTY...

AT 558 PM CDT...EMERGENCY MANAGEMENT REPORTED FLASH FLOODING IN THE
WARNED AREA. WATER UP TO 1 FOOT DEEP WAS OVER V AVENUE NEAR HIGHWAY
44. RADAR ESTIMATES THAT AS MUCH AS 3 TO 4 INCHES OF RAIN HAS
ALREADY FALLEN IN THE WARNED AREA.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
URBANDALE...CLIVE...WAUKEE...GRIMES...ADEL...DALLAS CENTER...GRANGER
AND MINBURN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4160 9403 4181 9403 4181 9382 4160 9381

$$

ZOGG
026 
WGUS73 KDMX 110149
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
849 PM CDT WED AUG 10 2016

IAC049-110159-
/O.CAN.KDMX.FF.W.0018.000000T0000Z-160811T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DALLAS IA-
849 PM CDT WED AUG 10 2016

...THE FLASH FLOOD WARNING FOR NORTHEASTERN DALLAS COUNTY IS
CANCELLED...

FLOOD WATERS HAVE RECEDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 4160 9403 4181 9403 4181 9382 4160 9381

$$

ZOGG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 3:47 PM CDTSevere Thunderstorm WarningDMXPolk28 min
Aug 10, 3:54 PM CDTSevere Thunderstorm WarningDMXCalhoun36 min
Aug 10, 4:55 PM CDTSevere Thunderstorm WarningDMXPalo Alto, Pocahontas35 min
Aug 10, 5:02 PM CDTSevere Thunderstorm WarningDMXDallas28 min
Aug 10, 5:47 PM CDTSpecial Weather StatementDMXWright43 min
Aug 10, 6:09 PM CDTSpecial Weather StatementDMXPolk51 min
Aug 10, 6:12 PM CDTSpecial Weather StatementDMXKossuth18 min

Nearby

Flash Flood Warnings in Iowa, 2016Every flash flood warning in 2016

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.