Alert archive / Iowa / Flash Flood Warnings in 2016

Flash Flood Warning 26, NWS Des Moines, IA

September 15, 20166 counties in Iowa

NWS Des Moines, IA issued this flash flood warning at Sep 15, 2016, 6:10 PM CDT for 6 counties in 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 15, 2016, 6:10 PM CDT (23:10 UTC)
Expired: Sep 16, 2016, 12:00 AM CDT
In force: 6 hr
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: None

Counties Calhoun County, IA, Humboldt County, IA, Pocahontas County, IA, Sac County, IA, Webster County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 137 km from the middle of the area, began a volume at 23:10 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
Sep 15, 7:30 PM CDT	FLASH FLOOD	Rockwell City, IA	LAW ENFORCEMENT REPORTED CAR STALLED/STRANDED AFTER DRIVING THROUGH FLOODED ROADS. DELAYED REPORT. .

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, 11.2 hours before the alert went out and 182 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: 696 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 648 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

119 
WGUS53 KDMX 152310
FFWDMX
IAC025-091-151-161-187-197-160500-
/O.NEW.KDMX.FF.W.0026.160915T2310Z-160916T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
610 PM CDT THU SEP 15 2016

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN WEBSTER COUNTY IN CENTRAL IOWA...
  POCAHONTAS COUNTY IN NORTHWESTERN IOWA...
  CALHOUN COUNTY IN WEST CENTRAL IOWA...
  HUMBOLDT COUNTY IN NORTH CENTRAL IOWA...
  NORTHWESTERN WRIGHT COUNTY IN NORTH CENTRAL IOWA...
  SAC COUNTY IN WEST CENTRAL IOWA...

* UNTIL MIDNIGHT CDT.

* AT 606 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. AS MUCH AS 2 TO 3 INCHES OF
  RAIN HAS ALREADY FALLEN ACROSS THE WARNED AREA...ESPECIALLY IN
  WESTERN POCAHONTAS COUNTY. THUNDERSTORMS ARE EXPECTED TO MOVE
  OVER THE WARNED AREA REPEATEDLY OVER THE NEXT SEVERAL
  HOURS...RESULTING IN ADDITIONAL HEAVY RAINFALL. ALTHOUGH SOME
  LOCATIONS IN THE WARNED AREA HAVE NOT YET RECEIVED ANY
  RAINFALL...THE RAINFALL IS EXPECTED TO BEGIN THERE SOON. FLASH
  FLOODING IS EXPECTED TO BEGIN SHORTLY IN THE WARNED AREA.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  FORT DODGE...SAC CITY...POCAHONTAS...ROCKWELL CITY...DAKOTA CITY...
  HUMBOLDT...EAGLE GROVE...MANSON...LAURENS...LAKE VIEW...ODEBOLT...
  FORT DODGE REGIONAL AIRPORT...SOUTH TWIN LAKE...NORTH TWIN LAKE...
  SCHALLER...POMEROY...GOLDFIELD...FONDA...COALVILLE AND ROLFE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4256 9539 4256 9492 4291 9491 4291 9359
      4231 9424 4231 9532 4247 9532 4248 9539

$$

ZOGG

2 follow-up statements

011 
WGUS73 KDMX 160242
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
942 PM CDT THU SEP 15 2016

IAC025-091-151-161-187-197-160500-
/O.CON.KDMX.FF.W.0026.000000T0000Z-160916T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WEBSTER IA-POCAHONTAS IA-CALHOUN IA-HUMBOLDT IA-WRIGHT IA-SAC IA-
942 PM CDT THU SEP 15 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR
NORTHERN WEBSTER...POCAHONTAS...CALHOUN...HUMBOLDT...NORTHWESTERN
WRIGHT AND SAC COUNTIES...

AT 939 PM CDT...MODERATE TO HEAVY RAIN CONTINUES TO FALL DUE TO
THUNDERSTORMS MOVING THROUGH THE AREA. UP TO TWO INCHES OR MORE OF
RAIN HAVE ALREADY FALLEN. FLASH FLOODING HAS BEEN REPORTED BY
LOCAL LAW ENFORCEMENT AND IS EXPECTED TO CONTINUE TO BE A THREAT.

SOME LOCATIONS THAT MAY EXPERIENCE FLOODING INCLUDE...
FORT DODGE...SAC CITY...POCAHONTAS...ROCKWELL CITY...DAKOTA CITY...
HUMBOLDT...EAGLE GROVE...MANSON...LAURENS...LAKE VIEW...ODEBOLT...
FORT DODGE REGIONAL AIRPORT...SOUTH TWIN LAKE...NORTH TWIN LAKE...
SCHALLER...POMEROY...GOLDFIELD...FONDA...COALVILLE AND ROLFE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4256 9539 4256 9492 4291 9491 4291 9359
      4231 9424 4231 9532 4247 9532 4248 9539

$$

CURTIS

311 
WGUS73 KDMX 160453
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1153 PM CDT THU SEP 15 2016

IAC025-091-151-161-187-197-160502-
/O.EXP.KDMX.FF.W.0026.000000T0000Z-160916T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WEBSTER IA-POCAHONTAS IA-CALHOUN IA-HUMBOLDT IA-WRIGHT IA-SAC IA-
1153 PM CDT THU SEP 15 2016

...THE FLASH FLOOD WARNING FOR NORTHERN WEBSTER...POCAHONTAS...
CALHOUN...HUMBOLDT...NORTHWESTERN WRIGHT AND SAC COUNTIES WILL EXPIRE
AT MIDNIGHT CDT...

LIGHT TO MODERATE RAINFALL IS EXPECTED TO PERSIST INTO THE
NIGHT...BUT THE THREAT FOR CONTINUED FLASH FLOODING IS DECREASING.
SOME AREAS MAY CONTINUE TO HAVE STANDING WATER THROUGH THE
NIGHT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 4256 9539 4256 9492 4291 9491 4291 9359
      4231 9424 4231 9532 4247 9532 4248 9539

$$

SKOW

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 3:35 PM CDT	Flash Flood Watch	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 32 more	13 hr
Sep 15, 5:01 PM CDT	Special Weather Statement	DMX	Pocahontas	14 min
Sep 15, 5:02 PM CDT	Special Weather Statement	DMX	Pocahontas	13 min
Sep 15, 5:17 PM CDT	Special Weather Statement	DMX	Pocahontas	28 min
Sep 15, 5:24 PM CDT	Special Weather Statement	DMX	Sac	21 min
Sep 15, 5:28 PM CDT	Severe Thunderstorm Warning	DMX	Sac	17 min
Sep 15, 5:40 PM CDT	Special Weather Statement	DMX	Calhoun, Pocahontas, Sac	35 min
Sep 15, 6:16 PM CDT	Special Weather Statement	DMX	Calhoun, Cerro Gordo, Franklin, Hamilton, Humboldt, Pocahontas and 4 more	44 min

Nearby

Flash Flood Warnings in Iowa, 2016 Every 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.