Alert archive / South Dakota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 69, NWS Sioux Falls, SD

July 13, 1997Minnehaha County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 13, 1997, 3:50 PM CDT for Minnehaha County, South Dakota. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 13, 1997, 3:50 PM CDT (20:50 UTC)
Expired: Jul 13, 1997, 4:20 PM CDT
In force: 30 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Minnehaha County, SD

The radar

The Sioux Falls radar (KFSD), 11 km from the middle of the area, began a volume at 20:54 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, 8.8 hours before the alert went out and 187 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: 825 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1060 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 132053 RRA
SVRFSD
SDC099-132120-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
350 PM CDT SUN JUL 13 1997

* SEVERE THUNDERSTORM WARNING FOR
  MINNEHAHA COUNTY IN SOUTHEASTERN SOUTH DAKOTA

* UNTIL 420 PM CDT
 
* SOME AREAS AFFECTED
  CROOKS                   AROUND 405 PM CDT
  RENNER                   AROUND 405 PM CDT
  LYONS                    AROUND 410 PM CDT

* AT 347 PM CDT...NATIONAL WEATHER SERVICE SPOTTERS REPORTED 1
INCH HAIL JUST SOUTHEAST OF HARTFORD. THE STORM IS MOVING
NORTHEAST AT 30 MPH.
 
AT SIGNS OF AN IMPENDING STORM...TOWERING THUNDERHEADS...DARKENING
SKIES...LIGHTNING AND INCREASING WINDS...MOVE TO A PLACE OF SAFETY.
TUNE TO NOAA WEATHER RADIO OR YOUR LOCAL MEDIA OUTLET FOR THE LATEST
WEATHER INFORMATION.

&

HARMON

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jul 13, 9:57 AM CDT, 5 hours 53 minutes earlier.

Area forecast discussion, Jul 13, 9:57 AM CDT, 5 hours 53 minutes before

SOUTH DAKOTA/NORTHWEST IOWA/SOUTHWEST MINNESOTA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SIOUX FALLS SD
955 AM CDT SUN JUL 13 1997

SOME ISOLATED SHOWERS REMAINED BETWEEN THE MISSOURI AND JAMES RIVERS OF
SD AT 1445Z WILE THE THUNDERSTORMS HAD MOVED BEYOND OUR CWA IN
NORTHWEST IA AND SOUTHWEST MN.  UPPER LOW IS FORECAST TO TRACK EAST
ALONG THE ND/SD BORDER THIS AFTERNOON AND EVENING.  THIS SHOULD KEEP
THE BEST CONVERGENCE AND LIFT TO THE NORTH OF OUR CWA.  BUT COOLING
ALOFT AND H5 AND DIURNAL HEATING IS EXPECTED TO CREATE SCATTERED
THUNDERSTORMS ACROSS THE CWA AS IN EARLIER FORECAST.  WILL UPDATE THE
ZONES TO CHANGE SOME WORDING AND TO SLOW DOWN THE FORECAST WIND SHIFT.

.FSD...NONE
UML(AND

In the hours before

Special weather statement, Jul 13, 11:05 AM CDT, 4 hours 45 minutes before

SIGNIFICANT WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1105 AM CDT SUN JUL 13 1997

*** SIGNIFICANT WEATHER PERTAINS TO WEATHER ELEMENTS ASSOCIATED WITH
THUNDERSTORMS. ***

.SYNOPSIS...AN UPPER LEVEL LOW WILL MOVE EAST ALONG THE NORTH DAKOTA
AND SOUTH DAKOTA BORDER THIS AFTERNOON AND EVENING.  A SURFACE TROUGH
AND WIND SHIFT IN THE WESTERN PART OF SOUTH DAKOTA WILL MOVE INTO
SOUTHWEST MINNESOTA AND NORTHWEST IOWA THIS EVENING.  WHILE THE MAIN
FOCUS FOR SEVERE THUNDERSTORMS WILL BE TO THE NORTH OF OUR AREA OF
CONCERN...SEVERE WEATHER IS STILL A POSSIBILITY AS THUNDERSTORMS
DEVELOP EARLY THIS AFTERNOON WEST OF THE MISSOURI RIVER IN CENTRAL
SOUTH DAKOTA AND SPREAD EAST ACROSS THE REGION LATER THIS AFTERNOON
AND CONTINUE INTO THE EVENING IN SOUTHWEST MINNESOTA AND NORTHWEST
IOWA.

SDZ050-052-057-058-063-140500-
AURORA-BRULE-CHARLES MIX-GREGORY-JERAULD-
INCLUDING THE CITIES OF...CHAMBERLAIN
1105 AM CDT SUN JUL 13 1997

FORECAST THROUGH MIDNIGHT:
SCATTERED THUNDERSTORMS MAY DEVELOP AFTER 2 PM WITH THE POSSIBLITY OF
SOME LARGE HAIL.  THE TUNDERSTORMS THREAT SHOULD HAVE MOVED EAST OF
THE AREA BY THIS EVENING.

* SIGNIFICANT WEATHER:
  LARGE HAIL (EQUAL TO  OR GREATER THAN 0.75 DIAMETER)

* SPOTTER ACTIVATION:
  SPOTTER ACTIVATION MAY BE NEEDED AFTER 2 PM CDT.

SDZ038>040-053>056-059>062-064>071-NEZ013-140500-
BEADLE-BON HOMME-BROOKINGS-CLAY-DAVISON-DOUGLAS-HANSON-HUTCHINSON-
KINGSBURY-LAKE-LINCOLN-MC COOK-MINER-MINNEHAHA-MOODY-SANBORN-TURNER-
UNION-YANKTON-DIXON-
INCLUDING THE CITIES OF...BROOKINGS...HURON...MITCHELL...SIOUX FALLS...
YANKTON
1105 AM CDT SUN JUL 13 1997

FORECAST THROUGH MIDNIGHT:
SCATTERED THUNDERSTORMS MAY DEVELOP AFTER 3 PM WITH THE POSSIBLITY OF
LOCALLY LARGE HAIL AND DAMAGING WIND GUSTS.

* SIGNIFICANT WEATHER:
  SEVERE WINDS (GUSTS EQUAL TO OR GREATER THAN 58 MPH)
  LARGE HAIL (EQUAL TO  OR GREATER THAN 0.75 DIAMETER)

* SPOTTER ACTIVATION:
  SPOTTER ACTIVATION MAY BE NEEDED AFTER 3 PM CDT.

MNZ071-072-080-081-089-090-097-098-IAZ001>003-012>014-020>022-031-032-
NEZ014-140500-
COTTONWOOD-JACKSON-LINCOLN-LYON-MURRAY-NOBLES-PIPESTONE-ROCK-
BUENA VISTA-CHEROKEE-CLAY-DICKINSON-IDA-LYON-OBRIEN-OSCEOLA-PLYMOUTH-
SIOUX-WOODBURY-DAKOTA-
INCLUDING THE CITIES OF...LUVERNE...PIPESTONE...SLAYTON...WORTHINGTON...
LE MARS...ROCK RAPIDS...SIOUX CENTER...SIOUX CITY...SPENCER...
SPIRIT LAKE...STORM LAKE
1105 AM CDT SUN JUL 13 1997

FORECAST THROUGH MIDNIGHT:
SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP FOR LATE AFTERNOON
AND INTO THE EVENING WITH THE POSSIBLITY OF LARGE HAIL AND DAMAGING
WIND GUSTS.

* SIGNIFICANT WEATHER:
  SEVERE WINDS (GUSTS EQUAL TO OR GREATER THAN 58 MPH)
  LARGE HAIL (EQUAL TO  OR GREATER THAN 0.75 DIAMETER)

* SPOTTER ACTIVATION:
  SPOTTER ACTIVATION MAY BE NEEDED AFTER 4 PM CDT.

UMLAND

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 5:00 AM CDT	Severe Thunderstorm Warning	FSD	Clay	45 min
Jul 13, 4:00 PM CDT	Severe Thunderstorm Warning	FSD	Turner	20 min
Jul 13, 4:21 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	29 min
Jul 13, 4:36 PM CDT	Severe Thunderstorm Warning	FSD	Moody	34 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1997 Every severe thunderstorm warning in 1997

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.