Alert archive / South Dakota / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 539

July 5, 20007 counties in Montana; 10 counties in South Dakota; Crook County, Weston County, Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at Jul 5, 2000, 4:15 PM MDT for 7 counties in Montana; 10 counties in South Dakota; Crook County, Weston County, Wyoming. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 5, 2000, 4:15 PM MDT (22:15 UTC)
Expired
Jul 5, 2000, 10:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Prairie County, MT, Rosebud County, MT, Treasure County, MT, Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Crook County, WY, Weston County, WY

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 5, 4:42 PM MDTSevere Thunderstorm WarningBYZPowder River63 min
Jul 5, 4:43 PM MDTSevere Thunderstorm WarningUNRLawrence47 min
Jul 5, 5:02 PM MDTTornado WarningBYZPowder River28 min
Jul 5, 5:34 PM MDTSevere Thunderstorm WarningBYZRosebud56 min
Jul 5, 5:35 PM MDTTornado WarningBYZPowder River55 min
Jul 5, 6:05 PM MDTSevere Thunderstorm WarningGGWPrairie55 min
Jul 5, 6:27 PM MDTTornado WarningBYZPowder River63 min
Jul 5, 6:43 PM MDTSevere Thunderstorm WarningUNRCuster47 min
Jul 5, 7:24 PM MDTSevere Thunderstorm WarningUNRCuster51 min
Jul 5, 7:31 PM MDTSevere Thunderstorm WarningBYZCuster, Powder River59 min
Jul 5, 8:11 PM MDTSevere Thunderstorm WarningUNRCuster64 min
Jul 5, 9:21 PM MDTSevere Thunderstorm WarningUNRHarding39 min
Jul 5, 9:29 PM MDTSevere Thunderstorm WarningBYZCarter, Fallon61 min

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.3 hours before the alert went out and 216 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-pSkew-T log-p diagram, Rapid City, SD at 12:00Z on 2000-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 420 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 12:00Z on 2000-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
420 J/kg
Mixed-layer CIN
-237 J/kg
Mixed-layer LCL
668 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
317 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.2

Open this sounding in Storm Lab

The text

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

571 
WWUS9 KMKC 052149
SEL9  

SEL9  
MKC WW 052138
MTZ000-SDZ000-WYZ000-060400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 539
STORM PREDICTION CENTER NORMAN OK
338 PM MDT WED JUL 5 2000

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

   SOUTHEAST MONTANA                            
   WESTERN SOUTH DAKOTA                       
   NORTHEAST WYOMING                            

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 415 PM UNTIL
1000 PM MDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 85 STATUTE MILES
EAST AND WEST OF A LINE FROM 30 MILES NORTH NORTHWEST OF MILES CITY
MONTANA TO 80 MILES SOUTH SOUTHEAST OF RAPID CITY SOUTH DAKOTA.

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.

OTHER WATCH INFORMATION...  CONTINUE...WW 537...WW 538...

DISCUSSION...THUNDERSTORMS ARE BEGINNING TO DEVELOP OVER THE HIGHER
TERRAIN. ACTIVITY LIKELY TO BECOME SEVERE GIVEN SUPERCELL WIND
PROFILES. MAIN THREAT APPEARS TO BE FROM LARGE HAIL...WITH DAMAGING
WIND GUSTS POSSIBLE GIVEN HIGH NEAR-SURFACE DEWPOINT DEPRESSIONS.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 27015.


...VESCIO

464,1041 425,1004 425,1040 464,1075

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 4, 8:15 PM MDTSevere Thunderstorm WatchSPCCampbell, Corson, Dewey, Edmunds, Faulk, Hughes and 9 more6 hr

Nearby

Severe Thunderstorm Watches in South Dakota, 2000Severe Thunderstorm Watches in Montana, 2000Severe Thunderstorm Watches in Wyoming, 2000Every severe thunderstorm watch in 2000

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.