Alert archive / South Dakota / Severe Thunderstorm Watches in 2008

Severe Thunderstorm Watch 430

June 3, 200818 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 3, 2008, 1:53 AM MDT for 18 counties in South Dakota. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jun 3, 2008, 1:53 AM MDT (07:53 UTC)
Expired: Jun 3, 2008, 5:32 AM MDT
In force: 4 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

Counties Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Hughes County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Lyman County, SD, Meade County, SD, Mellette County, SD, Pennington County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 51 km from the middle of the area, began a volume at 07:56 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 10%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 3, 2:12 AM MDT	Severe Thunderstorm Warning	UNR	Meade	42 min
Jun 3, 2:31 AM MDT	Severe Thunderstorm Warning	UNR	Custer, Meade, Pennington	59 min
Jun 3, 3:25 AM MDT	Severe Thunderstorm Warning	UNR	Haakon, Jackson, Pennington	43 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 7.9 hours before the alert went out and 57 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: 1085 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 1211 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.8

Open this sounding in Storm Lab

The text

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

000
WWUS20 KWNS 030750
SEL0  
SPC WW 030750
SDZ000-031500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 430
NWS STORM PREDICTION CENTER NORMAN OK
150 AM MDT TUE JUN 3 2008

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 

       WESTERN AND SOUTHERN SOUTH DAKOTA

EFFECTIVE THIS TUESDAY MORNING FROM 150 AM UNTIL 900 AM MDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST
NORTHWEST OF RAPID CITY SOUTH DAKOTA TO 55 MILES SOUTHEAST OF
PIERRE SOUTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 427...WW 428...WW 429...

DISCUSSION...SMALL MCS WITH EMBEDDED SUSTAINED/POSSIBLE SUPERCELL
STRUCTURES JUST CROSSING INTO WRN SD EXPECTED TO CONTINUE MAINLY ESE
AS ASSOCIATED UPR TROUGH IN ERN MT CONTINUES EWD.  ALTHOUGH
INTERACTION OF MCS WITH BLACK HILLS CASTS UNCERTAINTY ON SYSTEMS
FUTURE EVOLUTION/ STRENGTH...REGIONAL VWP DATA AND FORCING FROM
SHORTWAVE IMPULSE SUGGEST POTENTIAL FOR ADDITIONAL SVR HAIL/WIND
DESPITE UNKNOWN INFLUENCE FROM MOUNTAINS AND UNFAVORABLE TIME OF
DAY.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 29035.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 2, 6:11 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brule, Buffalo, Charles Mix, Davison and 20 more	34 min
Jun 2, 6:33 PM MDT	Severe Thunderstorm Watch	SPC	Bennett, Buffalo, Haakon, Hand, Hughes, Hyde and 7 more	5 hr
Jun 2, 9:02 PM MDT	Mesoscale Discussion	SPC	Aurora, Bon Homme, Brule, Buffalo, Charles Mix, Davison and 21 more	118 min
Jun 3, 12:57 AM MDT	Severe Thunderstorm Watch	SPC	Bon Homme, Clay, Hutchinson, Lincoln, Turner, Union and 1 more	3 hr
Jun 3, 1:38 AM MDT	Mesoscale Discussion	SPC	Bennett, Custer, Haakon, Jackson, Jones, Mellette and 3 more	67 min
Jun 3, 3:12 AM MDT	Mesoscale Discussion	SPC	Clay, Union	2 hr
Jun 3, 5:24 AM MDT	Mesoscale Discussion	SPC	Hughes, Jones, Lyman, Mellette, Stanley, Todd and 1 more	36 min

Nearby

Severe Thunderstorm Watches in South Dakota, 2008 Every severe thunderstorm watch in 2008

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.