Alert archive / South Dakota / Areal Flood Warnings in 2010

Areal Flood Warning 21, NWS Sioux Falls, SD

July 30, 20108 counties in South Dakota

NWS Sioux Falls, SD issued this areal flood warning at Jul 30, 2010, 8:22 AM CDT for 8 counties in South Dakota. 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 as issued.

The facts

Issued: Jul 30, 2010, 8:22 AM CDT (13:22 UTC)
Expired: Jul 30, 2010, 11:30 PM CDT
In force: 15 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

Counties Aurora County, SD, Beadle County, SD, Davison County, SD, Hanson County, SD, Jerauld County, SD, McCook County, SD, Miner County, SD, Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 143 km from the middle of the area, began a volume at 13:25 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

Aberdeen, SD (KABR), launched 12:00Z, 1.4 hours before the alert went out and 94 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: 49 J/kg
Mixed-layer CIN: -253 J/kg
Mixed-layer LCL: 471 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 61 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.

756 
WGUS43 KFSD 301322
FLWFSD

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
822 AM CDT FRI JUL 30 2010

SDC003-005-035-061-073-087-097-111-310430-
/O.NEW.KFSD.FA.W.0021.100730T1322Z-100731T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JERAULD SD-SANBORN SD-MINER SD-AURORA SD-BEADLE SD-DAVISON SD-
HANSON SD-MCCOOK SD-
822 AM CDT FRI JUL 30 2010

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLOOD WARNING FOR...
  HANSON COUNTY IN SOUTHEAST SOUTH DAKOTA
  JERAULD COUNTY IN EAST CENTRAL SOUTH DAKOTA
  NORTHEASTERN AURORA COUNTY IN SOUTHEAST SOUTH DAKOTA
  NORTHERN DAVISON COUNTY IN SOUTHEAST SOUTH DAKOTA
  SANBORN COUNTY IN EAST CENTRAL SOUTH DAKOTA
  SOUTHWESTERN BEADLE COUNTY IN EAST CENTRAL SOUTH DAKOTA
  SOUTHWESTERN MINER COUNTY IN EAST CENTRAL SOUTH DAKOTA
  WESTERN MCCOOK COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 1130 PM CDT FRIDAY

* AT 816 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AND 
  OBSERVER REPORTS INDICATED THAT 3 TO 7 INCHES OF RAIN FELL ACROSS 
  THE WARNED AREA OVERNIGHT. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLOODING TO OCCUR.
  SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...MITCHELL...
  ALEXANDRIA...ALPENA...EMERY...FARMER...FORESTBURG...FULTON...
  LANE...LETCHER...LOOMIS...SPENCER...VIRGIL...WESSINGTON SPRINGS AND
  WOONSOCKET.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT OR IN A VEHICLE.

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

&&

LAT...LON 4372 9744 4350 9773 4411 9894 4420 9894
      4421 9893 4421 9871 4442 9871 4444 9868

$$

GILLISPIE

What forecasters said that day

The local office's own words before this areal 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 areal flood warning went out at Jul 30, 3:30 AM CDT, 4 hours 52 minutes earlier.

Area forecast discussion, Jul 30, 3:30 AM CDT, 4 hours 52 minutes before

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
330 AM CDT FRI JUL 30 2010

.DISCUSSION...
DUE TO THE STORMS MOVG SE ACRS CWA...DISCUSSION WL BE SHORT. EXPECT
TRW TO CONT TO SPREAD SEWD ACRS NW IA EARLY THIS MORN WITH POT FOR
HEAVY RAINS. WL NEED TO KEEP CHC IN ACRS REST OF CWA THIS MORN AHEAD
OF WEAK FNT WHICH WILL REACH I29 BY EARLY AFTN. MORE STORMS CUD
REFIRE AHEAD OF THIS BNDRY THIS AFTN. IF ENUF CLEARING CAN OCCUR
THIS AFTN THEN POT WL EXIST FOR SVR STORMS ACRS NW IA AND FAR SE SD.
HIGH UNCERTAINTY ABOUT THIS AS STRATUS IS LIKELY TO DEVELOP BEHIND
THE CURRENT COMPLEX AND MAY NOT BREAK UP AT ALL TODAY EXCEPT WRN CWA
AS BNDRY PUSH THRU. TEMPS WL TEND BLO GUID ACRS THE ENTIRE CWA DUE
TO THE CLOUDS AND WET GND.

ANY ACTIVITY THAT DEVELOPS THIS AFTN SHUD END BY EARLY EVE WITH POT
FOR FOG LATER IN THE NIGHT DUE TO THE DEAD AIR EXPECTED ACRS THE
CWA. WITH ALL THE RAIN THE LAST FEW DAYS...WUD NOT TAKE MUCH TO
GENERATE FOG.

MOST OF THE WEEKEND LOOKS DRY BUT IT WL REMAIN HUMID WITH ANOTHER
SHOT FOR TRW MAINLY SUN INTO MON. WL AGAIN SEE THE POT FOR HEAVY
RAINS. THE PATTERN WL NOT CHANGE ANY TIME SOON.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...

SD...NONE.
MN...NONE.
IA...NONE.
NE...NONE.

&&

Hazardous weather outlook, Jul 30, 4:04 AM CDT, 4 hours 18 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
404 AM CDT FRI JUL 30 2010

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-311200-
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-
404 AM CDT FRI JUL 30 2010

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
THERE WILL BE A CHANCE OF THUNDERSTORMS ACROSS THE AREA THIS
MORNING. THERE STORMS ARE NOT EXPECTED TO BE SEVERE.
HOWEVER...THEY WILL PRODUCE HEAVY RAINS OVER NORTHWEST IOWA.
THUNDERSTORMS MAY REDEVELOP THIS AFTERNOON EAST OF THE JAMES
VALLEY AHEAD OF AN APPROACHING FRONT. IF STORMS DO DEVELOP A FEW
COULD BE SEVERE WITH HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS
TO 60 MPH.

FLOODING...
HEAVY RAINFALL OVER THE LAST SEVERAL DAYS HAS PRODUCED AREAS OF
RIVER FLOODING ALONG THE VERMILLION...BIG SIOUX AND LITTLE SIOUX.
FLOODING CONTINUES ALONG THE JAMES RIVER.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THERE WILL BE A CHANCE OF THUNDERSTORMS SUNDAY INTO MONDAY. A FEW
STORMS COULD BE SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE POSSIBLE THIS AFTERNOON EAST OF THE
JAMES VALLEY.

&&

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

In the hours before

Local storm report, Jul 30, 2:30 AM CDT, 5 hours 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
230 AM CDT FRI JUL 30 2010

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

0229 AM     HEAVY RAIN       4 WSW SIOUX FALLS       43.53N 96.80W
07/30/2010  M3.38 INCH       MINNEHAHA          SD   TRAINED SPOTTER

            MEASURED SINCE RAIN BEGAN AND STILL RAINING HEAVY.

&&

CJANSEN

Local storm report, Jul 30, 4:43 AM CDT, 3 hours 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
443 AM CDT FRI JUL 30 2010

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

0438 AM     FLASH FLOOD      15 S SIOUX FALLS        43.33N 96.73W
07/30/2010                   LINCOLN            SD   BROADCAST MEDIA

            HIGHWAY 11 NEAR 274TH STREET IMPASSIBLE. MANY OTHER ROADS
            COVERED WITH WATER.

&&

JM

Local storm report, Jul 30, 6:10 AM CDT, 2 hours 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
610 AM CDT FRI JUL 30 2010

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

0609 AM     HEAVY RAIN       3 SE SIOUX FALLS        43.51N 96.68W
07/30/2010  M4.56 INCH       MINNEHAHA          SD   TRAINED SPOTTER

            24 HOUR RAINFALL TOTAL.

&&

CJANSEN

Local storm report, Jul 30, 7:35 AM CDT, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
735 AM CDT FRI JUL 30 2010

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

0732 AM     HEAVY RAIN       3 SSE SIOUX FALLS       43.50N 96.71W
07/30/2010  M5.50 INCH       MINNEHAHA          SD   TRAINED SPOTTER

&&

DMORIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 8:28 PM CDT	River Flood Warning	FSD	Union	9 days
Jul 29, 9:27 PM CDT	Flash Flood Warning	FSD	Beadle, Jerauld, Sanborn	5 hr
Jul 29, 11:12 PM CDT	Flash Flood Warning	FSD	Davison, Hanson, Miner, Sanborn	4 hr
Jul 30, 1:14 AM CDT	Flash Flood Warning	FSD	Lincoln, McCook, Minnehaha, Turner	106 min
Jul 30, 2:04 AM CDT	Flash Flood Warning	FSD	Lincoln	3 hr
Jul 30, 3:00 AM CDT	Flash Flood Warning	FSD	Clay, Union	3 hr
Jul 30, 3:52 AM CDT	Flash Flood Warning	FSD	Union	3 hr
Jul 30, 7:54 AM CDT	River Flood Warning	FSD	McCook	4 days
Jul 30, 7:54 AM CDT	River Flood Warning	FSD	Turner	5 days
Jul 30, 7:54 AM CDT	River Flood Warning	FSD	Lincoln, Minnehaha	25 hr
Jul 30, 7:54 AM CDT	River Flood Warning	FSD	Lincoln, Minnehaha	29 hr
Jul 30, 9:59 AM CDT	River Flood Warning	FSD	Lincoln, Union	5 days
Jul 30, 9:59 AM CDT	River Flood Warning	FSD	Lincoln, Minnehaha	23 hr
Jul 30, 10:18 AM CDT	River Flood Warning	FSD	Turner	4 days
Jul 30, 10:18 AM CDT	River Flood Warning	FSD	Clay	9 days
Jul 30, 10:56 AM CDT	River Flood Warning	FSD	Davison	8 days

Nearby

Areal Flood Warnings in South Dakota, 2010 Every areal flood warning in 2010

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.