Alert archive / Iowa / Flash Flood Warnings in 2007

Flash Flood Warning 2, NWS Sioux Falls, SD

March 31, 2007Plymouth County, Iowa

NWS Sioux Falls, SD issued this flash flood warning at Mar 31, 2007, 3:27 PM CDT for Plymouth County, Iowa. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Mar 31, 2007, 3:27 PM CDT (20:27 UTC)
Expired
Mar 31, 2007, 7:30 PM CDT
In force
4 hr
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Plymouth County, IA

The radar

The Sioux Falls radar (KFSD), 103 km from the middle of the area, began a volume at 20:28 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 12:00Z, 8.5 hours before the alert went out and 158 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 12:00Z on 2007-03-31Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2007-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 252 square meters per square second.19395878Sfc1 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
523 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
252 m²/s²
0-3 km storm-relative helicity
288 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KFSD 312028
FFWFSD
IAC149-010030-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
327 PM CDT SAT MAR 31 2007

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN PLYMOUTH COUNTY IN NORTHWEST IOWA

* UNTIL 730 PM CDT

* AT 324 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM 8
  MILES NORTHEAST OF AKRON TO 56 MILES SOUTHEAST OF HINTON...OR ALONG
  A LINE EXTENDING FROM 6 MILES SOUTH OF HAWARDEN TO 31 MILES
  SOUTHWEST OF IDA GROVE...MOVING NORTH AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MERRILL...CRAIG...LE MARS AND STRUBLE

ADDITIONAL RAINFALL AMOUNTS OF AN INCH TO TWO INCHES ARE POSSIBLE IN 
THE WARNED AREA. ESTIMATED RAINFALL TOTALS OVER WESTERN PLYMOUTH 
COUNTY THROUGH 300 PM CDT ARE AROUND AN INCH AND A HALF. 

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

LAT...LON 4274 9663 4258 9646 4258 9612 4291 9617
      4290 9652

$$

08
2 follow-up statements
000 
WGUS73 KFSD 312239
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
537 PM CDT SAT MAR 31 2007

IAC149-010030-
PLYMOUTH IA-
537 PM CDT SAT MAR 31 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
WESTERN PLYMOUTH COUNTY...

AT 537 PM CDT...MOST OF THE HEAVY RAIN HAS MOVED NORTH OF THE AREA. 

HOWEVER...EXCESSIVE RUNOFF FROM EARLIER HEAVY RAINFALL WILL CAUSE 
FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS 
FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

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. MOVE TO HIGHER GROUND.

LAT...LON 4274 9663 4258 9646 4258 9612 4291 9617
      4290 9652

$$
RSR
000 
WGUS73 KFSD 312331
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
629 PM CDT SAT MAR 31 2007

IAC149-312339-
PLYMOUTH IA-
629 PM CDT SAT MAR 31 2007

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WESTERN PLYMOUTH
COUNTY...

HEAVY RAINFALL IS NO LONGER EXPECTED THIS EVENING ACROSS PLYMOUTH 
COUNTY. 


A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM CDT SATURDAY EVENING
FOR NORTHWEST IOWA.

LAT...LON 4274 9663 4258 9646 4258 9612 4291 9617
      4290 9652

$$
BT

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 30, 11:38 PM CDTDense Fog AdvisoryFSDBuena Vista, Cherokee, Clay, Dickinson, Lyon, O'Brien and 2 more4 hr
Mar 31, 2:45 PM CDTSevere Thunderstorm WarningFSDPlymouth, Woodbury30 min
Mar 31, 3:13 PM CDTFlash Flood WarningFSDWoodbury4 hr
Mar 31, 3:18 PM CDTSevere Thunderstorm WarningFSDWoodbury42 min
Mar 31, 3:51 PM CDTFlash Flood WarningFSDSioux3 hr
Mar 31, 4:47 PM CDTSevere Thunderstorm WarningFSDO'Brien22 min
Mar 31, 4:51 PM CDTSevere Thunderstorm WarningFSDSioux23 min

Nearby

Flash Flood Warnings in Iowa, 2007Every flash flood warning in 2007

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.