Damaging Wind in South Dakota, June 14, 2015

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
327 AM MDT SUN JUN 14 2015

.SHORT TERM...TODAY THROUGH MONDAY NIGHT
ISSUED AT 326 AM MDT SUN JUN 14 2015

CURRENT SURFACE ANALYSIS SHOWS NEARLY STATIONARY FRONTAL BOUNDARY
FROM CENTRAL SD ACROSS WESTERN NEB AND SOUTHERN WY. UPPER LEVEL
ANALYSIS SHOWS NEAR ZONAL FLOW ACROSS THE REGION..WITH UPPER LOW
REMAINING ACROSS SOUTH CENTRAL CANADA. SHORTWAVE ENERGY NEAR EXIT
REGION OF UPPER JET AND STRONG MID LEVEL THETA-E ADVECTION IS
HELPING TO PRODUCE QUITE A BIT OF SHOWER AND THUNDERSTORM ACTIVITY
FROM NORTHEAST WY AND THE NORTHERN BLACK HILLS INTO NORTHWEST SD.
A FEW STORMS HAVE BEEN STRONG TO SEVERE OVERNIGHT WITH HAIL AND
GUSTY WINDS. SKIES ARE MOSTLY CLOUDY IN MANY AREAS NOW WITH TEMPS
RANGING FROM FROM THE LOW TO MID 50S ACROSS NORTHEAST WY TO NEAR
70 OVER SOUTH CENTRAL SD.

UNSETTLED WX WILL CONTINUE INTO THE UPCOMING WEEK...WITH DAILY
CHANCES FOR PCPN IN MOST AREAS. COOLER AIR IN PLACE BEHIND THE
BOUNDARY WILL KEEP TEMPS BELOW AVERAGE IN MANY AREAS OVER THE NEXT
COUPLE OF DAYS...EXCEPT FOR SOUTH CENTRAL SD.

FOR TODAY...MAIN BAND OF SHOWERS AND THUNDERSTORMS WILL EXIT THE CWA
BY 15Z. HOWEVER...SPOTTY SHOWER AND THUNDERSTORM ACTIVITY WILL
LIKELY REDEVELOP THROUGH THE LATE MORNING AND AFTERNOON. THE
POTENTIAL FOR STRONG TO SEVERE THUNDERSTORMS SHOULD BE GREATEST
ACROSS SOUTH CENTRAL SD IN THE VICINITY OF THE FRONTAL BOUNDARY THIS
AFTERNOON. WARM AND MOIST ENVIRONMENT THERE SHOULD PRODUCE SBCAPE
VALUES OF 1000 TO 2000 J/KG IN THE AFTERNOON. HOWEVER...SHEAR LOOKS
RELATIVELY WEAK...SO STORMS MAY END UP BEING PULSEY IN NATURE. HIGHS
WILL RANGE FROM THE LOW TO MID 60S ACROSS A GOOD PORTION OF
NORTHEAST WY AND THE BLACK HILLS TO THE MID 80S OVER TRIPP COUNTY.
ADDITIONAL SHORTWAVE ENERGY IS PROGGED TO TRACK ACROSS SOUTHERN
PORTIONS OF THE CWA INTO THE CENTRAL PLAINS TONIGHT...WITH BEST
CHANCES FOR RAINFALL ACROSS FAR SOUTHERN PORTIONS OF THE CWA. LOWS
WILL MOSTLY BE IN THE 50S...WITH SOME 40S ACROSS THE HILLS AND
NORTHEAST WY.

MODELS DIFFER SOME ON MONDAY...WITH GFS AND NAM DRY IN MANY
AREAS...WHILE ECMWF SHOWING ANOTHER WEAK WAVE BRINGING MORE PCPN
ACROSS NORTHEAST WY AND MUCH OF WESTERN SD. WILL KEEP CHANCES FOR
MUCH OF THE CWA...ESPECIALLY FOR THE AFTERNOON...WITH THE BEST
CHANCES OVER NORTHEAST WY AND SOUTHWEST SD.  EITHER WAY...THE BEST
AND MOST WIDESPREAD CHANCES FOR PCPN EARLY IN THE WEEK SHOULD HOLD
OFF UNTIL MONDAY NIGHT AND ESPECIALLY TUESDAY...AS A STRONGER WAVE
MOVES ACROSS THE REGION.  HIGHS ON MONDAY WILL BE IN THE MID 60S TO
MID 70S...WITH A GOOD DEAL OF CLOUD COVER PERSISTING.

.LONG TERM...TUESDAY THROUGH SATURDAY
ISSUED AT 326 AM MDT SUN JUN 14 2015

MODELS CONTINUE TO SHOW MEAN ZONAL FLOW ACROSS THE AREA
TUESDAY THROUGH NEXT WEEKEND. PERIODIC SHORTWAVES WILL MOVE ACROSS
THE CWA IMPINGING ON FRONTAL BOUNDARY DRAPED ACROSS MT/WY/SD/ND.
RESULT WILL BE A DAILY CHANCE OF SHRA/TSRA WITH THE BEST CHANCE OF
WIDESPREAD PRECIPITATION OVER WESTERN SD TUESDAY WHEN HEAVY RAIN IS
POSSIBLE. TEMPERATURES WILL BE NEAR AVERAGE.

&&

.AVIATION...FOR THE 12Z TAFS THROUGH 12Z MONDAY MORNING
ISSUED AT 326 AM MDT SUN JUN 14 2015

SHRA/TSRA WILL MOVE ACROSS WESTERN SD EARLY THIS MORNING... AND
THEN INTO CENTRAL SD. MVFR CIGS/IFR VSBYS WITH THE TSRA. AREA OF
MVFR/IFR CIGS WILL DEVELOP IN THE WAKE OF THE SHRA/TSRA
OVERNIGHT...AND WILL AFFECT THE KGCC AND KRAP TERMINALS. LOCAL
LIFR CONDITIONS POSSIBLE FOR THE BLACK HILLS. CIGS WILL BE SLOW TO
IMPROVE THIS MORNING...WITH MVFR CIGS LINGERING INTO EARLY THIS
AFTERNOON. ADDITIONAL SHRA/TSRA POSSIBLE THROUGH SUNDAY NIGHT.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...NONE.
WY...NONE.
&&

SHORT TERM...26
LONG TERM...HELGESON
AVIATION...HELGESON

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
646 AM MDT SAT JUN 13 2015

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-141300-
HARDING-PERKINS-BUTTE-NORTHERN MEADE CO PLAINS-ZIEBACH-
NORTHERN BLACK HILLS-NORTHERN FOOT HILLS-RAPID CITY-
SOUTHERN FOOT HILLS-CENTRAL BLACK HILLS-SOUTHERN BLACK HILLS-
CUSTER CO PLAINS-PENNINGTON CO PLAINS-HAAKON-FALL RIVER-SHANNON-
JACKSON-BENNETT-MELLETTE-TODD-TRIPP-STURGIS/PIEDMONT FOOT HILLS-
SOUTHERN MEADE CO PLAINS-HERMOSA FOOT HILLS-NORTHERN CAMPBELL-
SOUTHERN CAMPBELL-WESTERN CROOK-WYOMING BLACK HILLS-WESTON-
NORTHEASTERN CROOK-
646 AM MDT SAT JUN 13 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND
NORTHEASTERN WYOMING.

.DAY ONE...TODAY AND TONIGHT

THERE IS A CHANCE FOR THUNDERSTORMS ACROSS MUCH OF THE AREA THIS
AFTERNOON AND TONIGHT AS A COLD FRONT SLOWLY CROSSES THE AREA. ISOLATED
STRONG TO MARGINALLY SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON
INTO EARLY THIS EVENING...MAINLY ACROSS THE BLACK HILLS AREA AND
THE WESTERN SOUTH DAKOTA PLAINS. HAIL AND GUSTY WINDS CAN BE
EXPECTED WITH ANY STRONGER STORMS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

DAILY CHANCES FOR THUNDERSTORMS ARE EXPECTED FROM SUNDAY THROUGH
MUCH OF NEXT WEEK. ISOLATED STRONG TO MARGINALLY SEVERE STORMS ARE
POSSIBLE ON SUNDAY ACROSS PORTIONS OF SOUTHWEST INTO SOUTH
CENTRAL SOUTH DAKOTA DURING THE AFTERNOON AND EARLY EVENING.
SHOWERS AND THUNDERSTORMS WITH HEAVY RAINFALL ARE POSSIBLE MONDAY
NIGHT INTO TUESDAY AS A STRONGER UPPER LEVEL SYSTEM CROSSES THE
REGION.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY.

&&

STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER DETAILS OR UPDATES...
OR CHECK OUR WEB SITE AT WEATHER.GOV/RAPIDCITY

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RAPID CITY SD
302 AM MDT SUN JUN 14 2015

WYZ057-058-141000-
WYOMING BLACK HILLS WY-WESTON WY-
302 AM MDT SUN JUN 14 2015

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL WESTON COUNTY UNTIL
400 AM MDT...

AT 302 AM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 11
MILES NORTHEAST OF CLARETON...OR 19 MILES WEST OF NEWCASTLE...MOVING
EAST AT 25 MPH.

NICKEL SIZE HAIL WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
NEWCASTLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4392 10471 4403 10409 4384 10405 4378 10405
      4377 10406 4375 10467
TIME...MOT...LOC 0902Z 261DEG 23KT 4385 10459

HELGESON

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
359 AM MDT SUN JUN 14 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0349 AM     TSTM WND GST     2 NNE FAITH             45.04N 102.02W
06/14/2015  M63 MPH          PERKINS            SD   ASOS

&&

WFO UNR

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RAPID CITY SD
421 AM MDT SUN JUN 14 2015

SDZ013-014-031-032-043-073-141115-
PENNINGTON CO PLAINS SD-HAAKON SD-ZIEBACH SD-JACKSON SD-
NORTHERN MEADE CO PLAINS SD-SOUTHERN MEADE CO PLAINS SD-
421 AM MDT SUN JUN 14 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN JACKSON...WESTERN
HAAKON...EASTERN MEADE...NORTHEASTERN PENNINGTON AND ZIEBACH COUNTIES
UNTIL 515 AM MDT...

AT 421 AM MDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES NORTHEAST OF
FIRESTEEL TO 7 MILES NORTH OF WASTA...AND MOVING EAST AT 30 MPH.

DIME SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
EAGLE BUTTE...DUPREE...FAITH...CHERRY CREEK...MILESVILLE...
PLAINVIEW...ELM SPRINGS...BRIDGER...MARCUS...GRINDSTONE...RED ELM...
SOUTH EAGLE BUTTE...HOWES...THUNDER BUTTE...RED SCAFFOLD...IRON
LIGHTNING...CREIGHTON AND BILLSBURG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4500 10150 4499 10114 4482 10114 4395 10194
      4428 10269 4505 10203 4505 10201 4508 10200
      4548 10165 4547 10147
TIME...MOT...LOC 1021Z 285DEG 26KT 4552 10123 4418 10245

HELGESON

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
439 AM MDT SUN JUN 14 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0420 AM     TSTM WND GST     2 SW BRIDGER            44.53N 101.94W
06/14/2015  M64 MPH          ZIEBACH            SD   DEPT OF HIGHWAYS

&&

WFO UNR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
445 AM MDT SUN JUN 14 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0300 AM     TSTM WND GST     1 NE MUD BUTTE          45.02N 102.86W
06/14/2015  M64 MPH          MEADE              SD   DEPT OF HIGHWAYS

&&

WFO UNR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
505 AM MDT SUN JUN 14 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0455 AM     TSTM WND GST     1 WSW SOUTH EAGLE BUTTE 44.98N 101.25W
06/14/2015  M57 MPH          ZIEBACH            SD   MESONET

&&

WFO UNR