Alert archive / Iowa / Flash Flood Warnings in 2016

Flash Flood Warning 1, NWS Des Moines, IA

February 22, 2016Webster County, Iowa

NWS Des Moines, IA issued this flash flood warning at Feb 22, 2016, 12:29 AM CST for Webster County, Iowa. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Feb 22, 2016, 12:29 AM CST (06:29 UTC)
Expired
Feb 22, 2016, 6:30 AM CST
In force
6 hr
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Flood severity
None

County Webster County, IA

The radar

The Des Moines radar (KDMX), 93 km from the middle of the area, began a volume at 06:33 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.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 6.5 hours before the alert went out and 225 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 2016-02-22Temperature 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 2016-02-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.1939587897Sfc1 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
991 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
36 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

405 
WGUS53 KDMX 220629
FFWDMX
IAC187-221230-
/O.NEW.KDMX.FF.W.0001.160222T0629Z-160222T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1229 AM CST MON FEB 22 2016

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL WEBSTER COUNTY IN CENTRAL IOWA...

* UNTIL 630 AM CST MONDAY

* AT 1226 AM CST...LOCAL LAW ENFORCEMENT REPORTED A LARGE ICE JAM
  600 YARDS SOUTH OF THE HIGHWAY D14 BRIDGE WITH FLOODING REPORTED
  IN THE RIVERDALE DR AREA. THIS ICE JAM WILL LIKELY CAUSE FLOODING
  IN THE SCENIC DRIVE AND BREEN ROAD AREAS. FLASH FLOODING ACROSS
  THE WARNED AREA. FLASH FLOODING IS ALREADY OCCURRING.

THIS ICE JAM IS EXPECTED TO MOVE SLOWLY SOUTH AND WILL CAUSE FLASH
FLOODING UPSTREAM OF IT TONIGHT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4255 9416 4249 9416 4245 9410 4244 9419
      4254 9423

$$

DONAVON
1 follow-up statement
287 
WGUS73 KDMX 221037
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
437 AM CST MON FEB 22 2016

IAC187-221230-
/O.CON.KDMX.FF.W.0001.000000T0000Z-160222T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WEBSTER IA-
437 AM CST MON FEB 22 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 AM CST MONDAY
FOR CENTRAL WEBSTER COUNTY...

AT 434 AM CST...LOCAL LAW ENFORCEMENT REPORTED A LARGE ICE JAM
REMAINED JUST SOUTH OF THE HIGHWAY D14 BRIDGE WITH FLOODING REPORTED
IN THE RIVERDALE DR AREA. THIS ICE JAM MAY CAUSE FLOODING IN THE
SCENIC DRIVE AND BREEN ADDITION AREAS. 

THIS ICE JAM IS EXPECTED TO MOVE SLOWLY SOUTH. RIVER RISES UPSTREAM
OF THIS JAM HAVE JUMPED 3 TO 4 FEET OVER A SHORT PERIOD OF TIME.
FLASH FLOODING UPSTREAM OF THE JAM IS LIKELY IN LOW LYING AND
FLOOD PRONE AREAS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4255 9416 4249 9416 4245 9410 4244 9419
      4254 9423

$$

DONAVON

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 21, 7:28 PM CSTAreal Flood WarningDMXBoone, Dallas24 hr
Feb 21, 7:42 PM CSTRiver Flood WarningDMXDavis, Wapello5 days
Feb 22, 6:31 AM CSTAreal Flood WarningDMXWebster24 hr
Feb 22, 10:04 AM CSTRiver Flood WarningDMXMahaska, Wapello6 days
Feb 22, 10:52 AM CSTRiver Flood WarningDMXPolk4 days

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.