Alert archive / South Dakota / Tornado Watches in 1997

Tornado Watch 501

June 22, 199735 counties in South Dakota

The Storm Prediction Center issued this tornado watch at Jun 22, 1997, 12:00 PM CDT for 35 counties in South Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 22, 1997, 12:00 PM CDT (17:00 UTC)
Expired: Jun 22, 1997, 6:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 35 counties

Beadle County, SD, Brookings County, SD, Brown County, SD, Buffalo County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Corson County, SD, Day County, SD, Deuel County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Haakon County, SD, Hamlin County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Jones County, SD, Kingsbury County, SD, Lake County, SD, Marshall County, SD, McPherson County, SD, Miner County, SD, Moody County, SD, Potter County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Aberdeen radar (KABR), 120 km from the middle of the area, began a volume at 17:03 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.

Warnings issued inside it

21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 22, 12:10 PM CDT	Tornado Warning	ABR	McPherson, Walworth	30 min
Jun 22, 12:25 PM CDT	Tornado Warning	ABR	Edmunds	65 min
Jun 22, 12:42 PM CDT	Tornado Warning	ABR	Faulk	33 min
Jun 22, 12:46 PM CDT	Severe Thunderstorm Warning	ABR	McPherson	64 min
Jun 22, 1:00 PM CDT	Severe Thunderstorm Warning	ABR	Spink	65 min
Jun 22, 1:18 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand	62 min
Jun 22, 1:32 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds	48 min
Jun 22, 2:05 PM CDT	Severe Thunderstorm Warning	ABR	Spink	60 min
Jun 22, 2:28 PM CDT	Tornado Warning	ABR	Spink	32 min
Jun 22, 2:44 PM CDT	Tornado Warning	ABR	Clark	61 min
Jun 22, 2:47 PM CDT	Tornado Warning	ABR	Clark	58 min
Jun 22, 3:00 PM CDT	Tornado Warning	ABR	Spink	35 min
Jun 22, 3:27 PM CDT	Severe Thunderstorm Warning	ABR	Clark	48 min
Jun 22, 3:34 PM CDT	Severe Thunderstorm Warning	ABR	Codington, Hamlin	61 min
Jun 22, 4:00 PM CDT	Tornado Warning	ABR	Hamlin	50 min
Jun 22, 4:24 PM CDT	Tornado Warning	ABR	Deuel	61 min
Jun 22, 4:26 PM CDT	Tornado Warning	ABR	Deuel	59 min
Jun 22, 4:33 PM CDT	Tornado Warning	ABR	Hamlin	32 min
Jun 22, 5:02 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	48 min
Jun 22, 5:11 PM CDT	Severe Thunderstorm Warning	ABR	Clark	49 min
Jun 22, 5:26 PM CDT	Tornado Warning	FSD	Brookings	29 min

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 5.0 hours before the alert went out and 118 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: 1357 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 762 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

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

853 
WWUS9 KMKC 221635
SEL1  
MKC WW 221635
SDZ000-222300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 501
STORM PREDICTION CENTER NORMAN OK
1135 AM CDT SUN JUN 22 1997

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   CENTRAL AND EASTERN SOUTH DAKOTA                       

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM NOON CDT UNTIL 600
PM CDT.

TORNADOES...HAIL TO 2 3/4 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS ALONG AND 70 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 65 MILES NORTH NORTHWEST OF PHILIP SOUTH
DAKOTA TO 30 MILES EAST OF WATERTOWN SOUTH DAKOTA.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.


DISCUSSION...POTENTIAL FOR SUPERCELLS INCREASING THIS MORNING ALONG
NORTHERN FRINGE OF CAP IN SOUTH DAKOTA AS IMPULSE MOVING E FROM
WYOMING AND JET ENTRANCE REGION OVER THE UPPER MISSISSIPPI VALLEY
ENHANCE VERTICAL MOTION OVER REGION WITH MODERATE VERTICAL SHEAR.
AMPLE INSTABLITY FOR DEVELOPMENT AS SURFACE HEATING AND LOW LEVEL
MOISTURE INFLOW CONTINUE.  


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 3/4 INCHES.  EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
520.  MEAN STORM MOTION VECTOR 29035.


...CORFIDI

455,1020 455,0963 435,0963 435,1020

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 22, 4:30 PM CDT	Tornado Watch	SPC	Harding, Perkins	7 hr
Jun 22, 6:00 PM CDT	Severe Thunderstorm Watch	SPC	Bennett, Butte, Custer, Fall River, Haakon, Hughes and 13 more	5 hr
Jun 22, 6:00 PM CDT	Tornado Watch	SPC	Beadle, Brookings, Buffalo, Clark, Codington, Day and 14 more	5 hr

Nearby

Tornado Watches in South Dakota, 1997 Every tornado watch 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.