Alert archive / Iowa / Flash Flood Warnings in 2005

Flash Flood Warning 7, NWS Sioux Falls, SD

May 10, 2005Dickinson County, Iowa

NWS Sioux Falls, SD issued this flash flood warning at May 10, 2005, 11:15 PM CDT for Dickinson County, Iowa. It was in force for 2 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: May 10, 2005, 11:15 PM CDT (04:15 UTC)
Expired: May 11, 2005, 1:15 AM CDT
In force: 2 hr
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

County Dickinson County, IA

The radar

The Sioux Falls radar (KFSD), 124 km from the middle of the area, began a volume at 04:16 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, 4.3 hours before the alert went out and 203 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: 697 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: -113 m²/s²
0-3 km storm-relative helicity: -9 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 110417
FFWFSD
IAC059-110615-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1115 PM CDT TUE MAY 10 2005

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DICKINSON COUNTY IN NORTHWEST IOWA

* UNTIL 115 AM CDT

* AT 1115 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR 
  INDICATED FLASH FLOODING FROM THUNDERSTORMS MOVING ACROSS 
  DICKINSON COUNTY. THESE STORMS ARE MOVING EAST AT 25 MPH.

RADAR INDICATES THAT 1 TO 2 INCHES OF RAIN HAVE FALLEN IN THE SPIRIT 
LAKE AREA.  ANOTHER THUNDERSTORM...EXPECTED TO REACH SPIRIT LAKE 
AROUND 1130 PM CDT...MAY PRODUCE UP TO AN INCH OF RAINFALL THROUGH 
MIDNIGHT.  THIS AMOUNT OF RAINFALL IS EXPECTED TO CAUSE URBAN 
FLOODING IN THE SPIRIT LAKE AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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.

LAT...LON 4350 9539 4330 9539 4336 9494 4350 9493

$$

SCHUMACHER

2 follow-up statements

000 
WGUS73 KFSD 110510
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1206 AM CDT WED MAY 11 2005

IAC059-110615-
DICKINSON IA-
1209 AM CDT WED MAY 11 2005

...A FLASH FLOOD WARNING CONTINUES UNTIL 115 AM CDT FOR DICKINSON
COUNTY...

AT 1206 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE MODERATE RAIN PRODUCING FLASH FLOODING ACROSS DICKINSON 
COUNTY. THE RAINFALL CONTINUE TO MOVE EAST AT 25 MPH

ADDITIONAL RAINFALL AMOUNTS UP TO ONE HALF INCH ARE POSSIBLE IN THE 
WARNED AREA.  THIS WILL BE IN ADDITION AROUND 2 INCHES OF RAIN THAT 
HAS FALLING AROUND SPIRIT LAKE.  ANY ADDITIONAL RAINFALL WILL CREATE 
FLASH FLOODING...ESPECIALLY IN URBAN AREAS SUCH AS SPIRIT LAKE.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

LAT...LON 4350 9539 4330 9539 4336 9494 4350 9493

$$

SCHUMACHER

000 
WGUS73 KFSD 110620
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
118 AM CDT WED MAY 11 2005

IAC059-MNC063-105-110635-
DICKINSON IA-NOBLES MN-JACKSON MN-
118 AM CDT WED MAY 11 2005

...THE FLASH FLOOD WARNINGS FOR DICKINSON...JACKSON...AND SOUTHEAST 
NOBLES COUNTIES EXPIRED AT 115 AM CDT...

RAIN HAS EXITED THE WARNING AREA AS OF 115 AM CDT...THEREFORE THE 
FLASH FLOOD WARNING WAS ALLOWED TO EXPIRE. ADDITIONAL LIGHT SHOWERS 
ARE POSSIBLE THROUGH THE REMAINDER OF THE NIGHT...HOWEVER FLOODING 
RAINS ARE NOT EXPECTED AT THIS TIME.

IF YOU EXPERIENCED FLOODING FROM THE HEAVY RAIN LATE TUESDAY 
EVENING...REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY...AND HAVE 
THEM RELAY THE REPORT TO THE NATIONAL WEATHER SERVICE IN SIOUX FALLS.

LAT...LON 4363 9565 4351 9564 4350 9540 4330 9539
      4336 9494 4364 9490

$$
 JH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 9:42 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	25 min
May 10, 9:51 PM CDT	Severe Thunderstorm Warning	FSD	Osceola	39 min
May 10, 10:28 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson	32 min
May 10, 10:45 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	45 min
May 10, 11:51 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	39 min
May 10, 11:58 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	20 min

Nearby

Flash Flood Warnings in Iowa, 2005 Every flash flood warning in 2005

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.