Alert archive / Iowa / Flash Flood Warnings in 2016

Flash Flood Warning 36, NWS Des Moines, IA

September 23, 2016Hancock County, Wright County, Iowa

NWS Des Moines, IA issued this flash flood warning at Sep 23, 2016, 1:22 AM CDT for Hancock County, Wright 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 23, 2016, 1:22 AM CDT (06:22 UTC)
Expired: Sep 23, 2016, 7:15 AM CDT
In force: 6 hr
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: None

Counties Hancock County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 129 km from the middle of the area, began a volume at 06:25 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

Time	Report	Where	Remark
Sep 23, 3:30 AM CDT	FLASH FLOOD	3 Ssw Kanawha, IA	NUMEROUS SECONDARY ROADS WITH WATER OVERTOPPING THEM, SOME ARE CLOSED. MOSTLY IN NORTHERN WRIGHT COUNTY BUT OTHER SCATTERED ABOUT ELSEWHERE. .

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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 6.4 hours before the alert went out and 218 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: 579 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

061 
WGUS53 KDMX 230622
FFWDMX
IAC081-197-231215-
/O.NEW.KDMX.FF.W.0036.160923T0622Z-160923T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
122 AM CDT FRI SEP 23 2016

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN HANCOCK COUNTY IN NORTH CENTRAL IOWA...
  NORTHERN WRIGHT COUNTY IN NORTH CENTRAL IOWA...

* UNTIL 715 AM CDT.

* AT 121 AM 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 IF IT HAS NOT ALREADY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  BELMOND...ELM LAKE...KANAWHA...GOODELL AND BELMOND MUNICIPAL
  AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4296 9350 4274 9350 4282 9397 4297 9397

$$

SKOW

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 22, 9:16 PM CDT	Special Weather Statement	DMX	Polk	29 min
Sep 22, 9:37 PM CDT	Flash Flood Warning	DMX	Story	6 hr
Sep 22, 11:24 PM CDT	Flash Flood Warning	DMX	Bremer, Butler, Cerro Gordo, Franklin	6 hr
Sep 23, 12:22 AM CDT	River Flood Warning	DMX	Story	31 hr
Sep 23, 1:14 AM CDT	River Flood Warning	DMX	Polk, Story	33 hr
Sep 23, 3:36 AM CDT	Flash Flood Warning	DMX	Franklin, Humboldt, Kossuth, Wright	6 hr
Sep 23, 5:19 AM CDT	Areal Flood Warning	DMX	Butler, Franklin	6 hr
Sep 23, 5:42 AM CDT	Flash Flood Warning	DMX	Palo Alto, Pocahontas	4 hr
Sep 23, 7:15 AM CDT	Areal Flood Warning	DMX	Hancock, Wright	4 hr
Sep 23, 11:12 AM CDT	Areal Flood Warning	DMX	Black Hawk, Bremer, Butler, Franklin, Hancock, Wright	48 hr

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.