Alert archive / Iowa / Flash Flood Warnings in 2016

Flash Flood Warning 39, NWS Des Moines, IA

September 24, 2016Clarke County, Madison County, Warren County, Iowa

NWS Des Moines, IA issued this flash flood warning at Sep 24, 2016, 10:19 PM CDT for Clarke County, Madison County, Warren County, Iowa. It was in force for 6 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
Sep 24, 2016, 10:19 PM CDT (03:19 UTC)
Expired
Sep 25, 2016, 4:15 AM CDT
In force
6 hr
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Flood severity
None

Counties Clarke County, IA, Madison County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 49 km from the middle of the area, began a volume at 03:22 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
Sep 24, 11:00 PM CDTFLASH FLOOD1 Sw Murray, IATRAINED SPOTTER REPORTED FLOODING IN MURRAY... 6 TO 8 INCHES OF STANDING WATER STILL IN CITY PARK AT TIME OF REPORT. DRIVEWAY CULVERT DESTROYED BY WATER. A MOBILE HOME SURROUNDED BY 1 FOOT STANDING WATER ON ALL SIDES. DITCHES SEVERAL FEET DEEP FILLED WITH WATE

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 00:00Z, 3.3 hours before the alert went out and 215 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 00:00Z on 2016-09-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2016-09-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 106 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1448 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
106 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

As transmitted.

439 
WGUS53 KDMX 250319
FFWDMX
IAC039-121-181-250915-
/O.NEW.KDMX.FF.W.0039.160925T0319Z-160925T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1019 PM CDT SAT SEP 24 2016

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN MADISON COUNTY IN SOUTH CENTRAL IOWA...
  NORTHWESTERN CLARKE COUNTY IN SOUTH CENTRAL IOWA...
  WESTERN WARREN COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 415 AM CDT.

* AT 1018 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO THREE TO FOUR INCHES OF
  RAIN HAVE ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN
  SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  WINTERSET...AVENUE OF THE SAINTS EVENT CENTER...MURRAY...ST.
  CHARLES...NEW VIRGINIA...TRURO...MARTENSDALE...PATTERSON...ST.
  MARYS...EAST PERU...SPRING HILL AND BEVINGTON.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 37 AND 64.
 
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.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.

&&

LAT...LON 4144 9364 4108 9369 4102 9401 4132 9402
      4147 9381

$$

SKOW
1 follow-up statement
523 
WGUS73 KDMX 250911
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
411 AM CDT SUN SEP 25 2016

IAC039-121-181-250920-
/O.EXP.KDMX.FF.W.0039.000000T0000Z-160925T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MADISON IA-CLARKE IA-WARREN IA-
411 AM CDT SUN SEP 25 2016

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN MADISON...NORTHWESTERN
CLARKE AND WESTERN WARREN COUNTIES WILL EXPIRE AT 415 AM CDT...

FLOOD WATERS HAVE RECEDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. 

LAT...LON 4144 9364 4108 9369 4102 9401 4132 9402
      4147 9381

$$

COGIL

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 24, 8:37 PM CDTSpecial Weather StatementDMXPolk, Warren38 min
Sep 25, 4:33 PM CDTRiver Flood WarningDMXBlack Hawk, Bremer, Butler3 days
Sep 25, 4:51 PM CDTRiver Flood WarningDMXHamilton, Webster32 hr

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.