Alert archive / Iowa / Flash Flood Warnings in 2000

Flash Flood Warning 20, NWS Des Moines, IA

July 9, 2000Humboldt County, Iowa

NWS Des Moines, IA issued this flash flood warning at Jul 9, 2000, 11:48 PM CDT for Humboldt County, Iowa. It was in force for 15 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Jul 9, 2000, 11:48 PM CDT (04:48 UTC)
Expired: Jul 10, 2000, 2:45 PM CDT
In force: 15 hr
Issued by: NWS Des Moines, IA
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Humboldt County, IA

The radar

The Des Moines radar (KDMX), 128 km from the middle of the area, began a volume at 04:51 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

Minneapolis, MN (KMPX), launched 00:00Z, 4.8 hours before the alert went out and 233 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: 3029 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 779 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS53 KDMX 100451
FFWDMX
IAC091-100745-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1148 PM CDT SUN JUL 9 2000

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HUMBOLDT COUNTY IN NORTH CENTRAL IOWA

* UNTIL 245 AM

* AT 1146 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH FLASH FLOOD PRODUCING RAINS OVER BRADGATE...OR
  ABOUT 26 MILES NORTHWEST OF FORT DODGE...MOVING EAST AT 30 MPH.

  OTHER WARNING LOCATIONS INCLUDE THOR...RUTLAND...RENWICK...
  OTTOSEN...LIVERMORE...HUMBOLDT...HARDY...DAKOTA CITY AND BODE.

* THUNDERSTORMS ARE CONTINUOUSLY REDEVELOPING OVER THE WARNING
  AREA...RESULTING IN EXCESSIVE RAINFALL. RAINFALL RATES WILL AVERAGE
  ONE TO THREE INCHES PER HOUR.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA...LIVING NEAR THE AFFECTED
WATERWAYS...YOU SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND
PROPERTY.

LAT...LON 4292 9446 4265 9445 4265 9398 4290 9399

FORSTER
NNNN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 10:44 PM CDT	Flash Flood Warning	DMX	Emmet	18 hr
Jul 9, 11:05 PM CDT	Flash Flood Warning	DMX	Palo Alto	15 hr
Jul 9, 11:30 PM CDT	Flash Flood Warning	DMX	Kossuth	15 hr
Jul 10, 12:09 AM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Worth	36 min
Jul 10, 12:20 AM CDT	Severe Thunderstorm Warning	DMX	Franklin, Hardin	40 min
Jul 10, 12:29 AM CDT	Flash Flood Warning	DMX	Cerro Gordo, Worth	15 hr
Jul 10, 12:52 AM CDT	Severe Thunderstorm Warning	DMX	Butler	38 min
Jul 10, 12:57 AM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer	48 min
Jul 10, 1:24 AM CDT	Severe Thunderstorm Warning	DMX	Grundy	51 min
Jul 10, 1:29 AM CDT	Flash Flood Warning	DMX	Black Hawk, Bremer, Butler, Franklin, Grundy, Hardin	15 hr
Jul 10, 1:44 AM CDT	Flash Flood Warning	DMX	Emmet, Humboldt, Kossuth, Palo Alto	15 hr
Jul 10, 1:46 AM CDT	Severe Thunderstorm Warning	DMX	Black Hawk	29 min
Jul 10, 4:47 AM CDT	Flash Flood Warning	DMX	Humboldt, Kossuth	15 hr
Jul 10, 5:19 AM CDT	Flash Flood Warning	DMX	Black Hawk, Grundy	15 hr

Nearby

Flash Flood Warnings in Iowa, 2000 Every flash flood warning in 2000

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.