Alert archive / South Dakota / Flash Flood Warnings in 1986

Flash Flood Warning 5, NWS Aberdeen, SD

July 23, 1986Roberts County, South Dakota

NWS Aberdeen, SD issued this flash flood warning at Jul 23, 1986, 10:28 PM CDT for Roberts County, South Dakota. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Jul 23, 1986, 10:28 PM CDT (03:28 UTC)
Expired: Jul 24, 1986, 2:30 AM CDT
In force: 4 hr
Issued by: NWS Aberdeen, SD
Area: Whole counties

County Roberts County, SD

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Aberdeen, SD (KHON), launched 00:00Z, 3.5 hours before the alert went out and 140 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: 2981 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 2092 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 233 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 12.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KABR 240328 RRA
FFWABR
SDC109-240730-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
1028 PM CDT WED JUL 23 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING 
EFFECTIVE UNTIL 230 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

NORTHEAST SOUTH DAKOTA...ROBERTS

SOME OF THE CITIES INCLUDED IN

RAIN FALL AMOUNTS OF OVER TWO INCHES HAVE PRODUCED AREAS OF
FLOODING AND WITH ADDITIONAL PRECIPITATION EXPECTED AREAS OF
FLASH FLOODING CAN BE EXPECTED WITH RAPID RUN OFF FROM THE HILLS.

 THE SISSETON AIRPORT HAS REPORTED RAINFALL AMOUNTS OF TWO AND
 ONE HALF INCHES AND REPORTS FROM THE HIWAY PATROL U.S. RT 10
 BETWEEN THE HILL AREA WEST OF SISSETON TO THE EDGE OF SISSETON
 THE HIWAY AND ITS DITCHES IS LEVEL WITH WATER.

A FLASH FLOOD WARNING MEANS FLASH FLOODING IS OCCURING OR IS
IMMINENT. ACT QUICKLY TO SAVE YOURSELF. GET OUT OF LOWLAND AREAS
SUBJECT TO FLOODING. AVOID ALREADY FLOODED AREAS. DO NOT ATTEMPT TO
FORD INUNDATED ROADS. WHEN YOU ARE OUT OF IMMEDIATE DANGER TUNE IN
AREA RADIO AND TELEVISION STATIONS FOR ADDITIONAL INFORMATION.
STUDNICKA

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.

In the hours before

Local storm report, Jul 23, 9:41 PM CDT, 47 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
935 PM CDT WED JUL 23 1986

TIME          LOCATION AND EVENT
745 PM CDT    SOUTHEAST OF VEBLEN (MARSHALL-ROBERTS) COUNTY LINE
              WINDP NEAR 60 MPH WITH SOME VISIBLE HAIL TO THE EAST.
915 PM CDT    SISSETON AIRPORT (ROBERTS COUNTY) ONE HALF INCH OF
              RAIN IN 30 MINUTES, MARBLE SIZE HAIL AND 35 MPH WIND.
 STUDNICKA

Local storm report, Jul 23, 9:59 PM CDT, 29 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
1000 PM CDT WED JUL 23 1986

TIME          LOCATION AND EVENT
950 PM CDT    3 MILES EAST OF SISSETON (ROBERTS COUNTY) HEAVY RAIN
              WhITH PEA TO MARBLE SIZE HAIL.
950 PM CDT    6 MILES SOUTH OF SISSETON (ROBERTS COUNTY) VERY HEAVY
              RAIN WITH MARBLE SIZE HAIL.
 STUDNICKA

Local storm report, Jul 23, 10:11 PM CDT, 17 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
1010 PM CDT WED JUL 23 1986

TIME          LOCATION AND EVENT
945 PM CDT    5 MILES EAST OF LAKE CITY VERY HEAVY RAIN. (MARSHALL
              CqOUNTY).
955 PM CDT    RED IRON LAKE (MARSHALL COUNTY) MARBLE SIZE HAIL, VERY
              HEAVY RAIN. WIND TO 35 MPH. DANGEROUS LIGHTING.
 STUDNICKA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 7:28 PM CDT	Severe Thunderstorm Warning	ABR	Roberts	62 min
Jul 23, 8:20 PM CDT	Severe Thunderstorm Warning	ABR	Marshall	55 min
Jul 23, 9:12 PM CDT	Severe Thunderstorm Warning	ABR	Marshall	63 min
Jul 23, 9:34 PM CDT	Severe Thunderstorm Warning	ABR	Roberts	56 min

Nearby

Flash Flood Warnings in South Dakota, 1986 Every flash flood warning in 1986

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.