Alert archive / South Dakota / Flash Flood Warnings in 2005

Flash Flood Warning 20, NWS Sioux Falls, SD

June 20, 2005Minnehaha County, South Dakota

NWS Sioux Falls, SD issued this flash flood warning at Jun 20, 2005, 8:11 PM CDT for Minnehaha County, South Dakota. It was in force for 3 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: Jun 20, 2005, 8:11 PM CDT (01:11 UTC)
Expired: Jun 20, 2005, 11:15 PM CDT
In force: 3 hr
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

County Minnehaha County, SD

The radar

The Sioux Falls radar (KFSD), 13 km from the middle of the area, began a volume at 01:13 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.2 hours before the alert went out and 185 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: 1190 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 1807 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KFSD 210112
FFWFSD
SDC099-210415-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
811 PM CDT MON JUN 20 2005

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MINNEHAHA COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 1115 PM CDT

* AT 811 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING PRODUCING RAINS FROM A THUNDERSTORM 4 MILES SOUTH 
  OF CROOKS...OR ABOUT 7 MILES NORTHWEST OF SIOUX FALLS...MOVING 
  SOUTHEAST AT 10 MPH.

RADAR ESTIMATES 1 TO 1.5 INCHES OF RAIN HAS FALLEN IN LESS THAN 30 
MINUTES. ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE
IN THE WARNED 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.

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN SIOUX
FALLS.

LAT...LON 4374 9710 4351 9713 4350 9651 4375 9649

$$

MG

1 follow-up statement

000 
WGUS73 KFSD 210331
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1029 PM CDT MON JUN 20 2005

SDC099-210415-
MINNEHAHA SD-
1029 PM CDT MON JUN 20 2005

...A FLASH FLOOD WARNING CONTINUES UNTIL 1115 PM CDT FOR MINNEHAHA
COUNTY...

AT 1029 PM CDT...A THUNDERSTORM PRODUCING VERY HEAVY RAIN WERE STILL 
BEING INDICATED ACROSS EASTERN MINNEHAHA COUNTY. RADAR ESTIMATES 
THAT 1 TO 3 INCHES OF RAIN HAS ALREADY FALLEN IN THIS AREA THIS 
EVENING...AND ADDITIONAL RAINFALL AMOUNTS OF UP TO ONE INCH ARE 
POSSIBLE IN THE WARNED AREA THROUGH 1100 PM.

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY 
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN SIOUX 
FALLS.

LAT...LON 4381 9709 4352 9708 4351 9647 4383 9647

$$

MG

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before this flash flood warning went out at Jun 20, 3:30 PM CDT, 4 hours 41 minutes earlier.

Area forecast discussion, Jun 20, 3:30 PM CDT, 4 hours 41 minutes before

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
330 PM CDT MON JUN 20 2005

.DISCUSSION...
ONGOING SVR WX. NO DISCUSSION.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...NONE.
MN...NONE.
IA...NONE.
NE...NONE.

&&

Hazardous weather outlook, Jun 20, 1:19 PM CDT, 6 hours 52 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
119 PM CDT MON JUN 20 2005

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-211200-
AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA-
CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE-
DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON-
IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN-
LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN-
OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN-
SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON-
119 PM CDT MON JUN 20 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA...
SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
SCATTERED THUNDERSTORMS SHOULD DEVELOP ALONG A SERIES OF OUTFLOW
BOUNDARIES NORTH OF INTERSTATE 90 THIS AFTERNOON AND
EVENING...THEN PROGRESS SOUTHEAST OVER THE AREA. A FEW OF THE
STORMS COULD BECOME SEVERE WITH DAMAGING WINDS AND PENNY SIZE
HAIL AS THE PRIMARY THREAT...ESPECIALLY ALONG AND NORTH OF
INTERSTATE 90. HOWEVER...THERE IS AN ISOLATED TORNADO THREAT
ALONG ANY OF THESE BOUNDARIES THROUGH THE EARLY EVENING HOURS.

EXCESSIVE TEMPERATURES...
HEAT INDICES WILL RISE INTO THE 100 TO 105 RANGE THIS AFTERNOON
WEST OF INTERSTATE 29...AS TEMPERATURES RISE INTO THE LOWER 90S
AND DEW POINTS REMAIN IN THE 70 TO 75 RANGE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THERE IS STILL A CHANCE OF THUNDERSTORMS REDEVELOPING NORTH OF
INTERSTATE 90 TUESDAY AFTERNOON AND MOVING SOUTHEAST THROUGH THE
AREA TUESDAY NIGHT. A FEW OF THESE STORMS COULD ALSO BE SEVERE.

A COLD FRONT SHOULD MOVE SOUTHEAST OVER THE AREA THURSDAY
NIGHT...BRINGING A CHANCE OF THUNDERSTORMS ALONG WITH IT. A FEW
OF THESE STORMS COULD BE SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE LIKELY AFTER 2 PM NORTH OF INTERSTATE
90.

&&

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT
WWW.CRH.NOAA.GOV/FSD. THIS INCLUDES THE GRAPHICAL HAZARDOUS
WEATHER OUTLOOK.

BT

In the hours before

Local storm report, Jun 20, 5:55 PM CDT, 2 hours 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
555 PM CDT MON JUN 20 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0554 PM     TSTM WND DMG     ROYAL                   43.06N 95.28W
06/20/2005                   CLAY               IA   PUBLIC

            POWER POLES DOWN.

&&

GH

Local storm report, Jun 20, 6:07 PM CDT, 2 hours 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
607 PM CDT MON JUN 20 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0553 PM     TSTM WND GST     LINN GROVE              42.89N 95.24W
06/20/2005  60 MPH           BUENA VISTA        IA   TRAINED SPOTTER

&&

BT

Local storm report, Jun 20, 6:08 PM CDT, 2 hours 3 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE SIOUX FALLS SD
608 PM CDT MON JUN 20 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0547 PM     TSTM WND GST     2 E WEBB                42.95N 94.97W
06/20/2005  65 MPH           CLAY               IA   PUBLIC

&&

BT

Local storm report, Jun 20, 6:51 PM CDT, 1 hour 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
651 PM CDT MON JUN 20 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0440 PM     HAIL             2 WSW JASPER            43.84N 96.44W
06/20/2005  0.75 INCH        ROCK               MN   TRAINED SPOTTER

&&

JH

Local storm report, Jun 20, 7:42 PM CDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
742 PM CDT MON JUN 20 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0705 PM     HAIL             14 ENE WAKONDA          43.09N 96.85W
06/20/2005  1.00 INCH        CLAY               SD   PUBLIC

0720 PM     HAIL             13 ENE WAKONDA          43.08N 96.87W
06/20/2005  1.75 INCH        CLAY               SD   PUBLIC

0735 PM     FLASH FLOOD      13 ENE WAKONDA          43.08N 96.87W
06/20/2005                   CLAY               SD   PUBLIC

            2+ INCHES OF WATER STANDING IN YARD AND DRIVEWAY.

&&

JH

Special weather statement, Jun 20, 8:03 PM CDT, 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
803 PM CDT MON JUN 20 2005

IAZ001-012-020-031-NEZ013-014-SDZ062-067-070-071-210200-
CLAY-DAKOTA NE-DIXON NE-LINCOLN-LYON IA-MINNEHAHA-PLYMOUTH IA-
SIOUX IA-UNION-WOODBURY IA-
803 PM CDT MON JUN 20 2005

...TRAVEL HIGHLY DISCOURAGED IN UNION AND CLAY COUNTIES OF SOUTH
DAKOTA...

A PAIR OF MASSIVE STORMS HAVE BEEN SLOWLY MOVING SOUTH OVER THE
LAST HOUR OR SO. GOLF BALL SIZE HAIL...POTENTIAL FLASH FLOODING AND
WIND GUSTS TO 60 MPH HAVE ALL BEEN REPORTED. IF YOU PLAN ANY TRAVEL
ALONG INTERSTATE 29 BETWEEN BERESFORD AND ELK POINT...OR ANY
HIGHWAYS WITHIN A 30 MPH RADIUS OF THIS AREA...PLEASE POSTPONE YOUR
PLANS.

08

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 7:21 PM CDT	Flash Flood Warning	FSD	Clay, Union	3 hr
Jun 20, 7:25 PM CDT	Severe Thunderstorm Warning	FSD	Union	50 min
Jun 20, 7:33 PM CDT	Severe Thunderstorm Warning	FSD	Clay	42 min
Jun 20, 8:07 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	23 min
Jun 20, 8:14 PM CDT	Flash Flood Warning	FSD	Brookings	3 hr
Jun 20, 8:15 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	61 min
Jun 20, 8:17 PM CDT	Flash Flood Warning	FSD	Turner	3 hr
Jun 20, 8:40 PM CDT	Severe Thunderstorm Warning	FSD	Turner	65 min
Jun 20, 9:22 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	42 min
Jun 20, 9:25 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	50 min
Jun 20, 9:38 PM CDT	Tornado Warning	FSD	Turner	37 min
Jun 20, 9:43 PM CDT	Flash Flood Warning	FSD	Moody	2 hr
Jun 20, 9:43 PM CDT	Severe Thunderstorm Warning	FSD	Jerauld, Sanborn	62 min
Jun 20, 10:08 PM CDT	Flash Flood Warning	FSD	Clay	2 hr
Jun 20, 10:13 PM CDT	Severe Thunderstorm Warning	FSD	Sanborn	62 min
Jun 20, 10:15 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	60 min
Jun 20, 10:16 PM CDT	Severe Thunderstorm Warning	FSD	Turner	29 min
Jun 20, 10:28 PM CDT	Severe Thunderstorm Warning	FSD	McCook	32 min
Jun 20, 10:31 PM CDT	Severe Thunderstorm Warning	FSD	Hanson	44 min
Jun 20, 10:39 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld	44 min
Jun 20, 10:43 PM CDT	Severe Thunderstorm Warning	FSD	Turner	32 min
Jun 20, 10:49 PM CDT	Flash Flood Warning	FSD	Bon Homme, Yankton	3 hr
Jun 20, 10:49 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	41 min
Jun 20, 10:57 PM CDT	Flash Flood Warning	FSD	Beadle, Sanborn	2 hr
Jun 20, 11:06 PM CDT	Severe Thunderstorm Warning	FSD	Davison	24 min
Jun 20, 11:10 PM CDT	Flash Flood Warning	FSD	McCook, Minnehaha, Turner	2 hr
Jun 20, 11:10 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Yankton	16 min
Jun 20, 11:15 PM CDT	Severe Thunderstorm Warning	FSD	Turner	12 min
Jun 20, 11:18 PM CDT	Severe Thunderstorm Warning	FSD	Hanson	58 min
Jun 20, 11:26 PM CDT	Flash Flood Warning	FSD	Davison, Hanson	2 hr
Jun 20, 11:28 PM CDT	Severe Thunderstorm Warning	FSD	Davison	32 min
Jun 20, 11:32 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix	47 min
Jun 20, 11:35 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	25 min
Jun 20, 11:37 PM CDT	Flash Flood Warning	FSD	Moody	113 min
Jun 21, 12:29 AM CDT	Severe Thunderstorm Warning	FSD	Charles Mix	47 min
Jun 21, 12:56 AM CDT	Flash Flood Warning	FSD	Charles Mix	3 hr
Jun 21, 1:04 AM CDT	Severe Thunderstorm Warning	FSD	Brule	56 min
Jun 21, 1:35 AM CDT	Flash Flood Warning	FSD	Bon Homme	115 min
Jun 21, 1:35 AM CDT	Severe Thunderstorm Warning	FSD	Gregory	40 min
Jun 21, 1:58 AM CDT	Severe Thunderstorm Warning	FSD	Brule	30 min
Jun 21, 2:25 AM CDT	Severe Thunderstorm Warning	FSD	Gregory	38 min
Jun 21, 3:11 AM CDT	Flash Flood Warning	FSD	Charles Mix	3 hr

Nearby

Flash Flood Warnings in South Dakota, 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.