SEL2
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 172
   NWS STORM PREDICTION CENTER NORMAN OK
   255 PM MDT SAT MAY 18 2013
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   
   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     WESTERN SOUTH DAKOTA
   
   * EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 255 PM UNTIL
     1000 PM MDT.
   
   * PRIMARY THREATS INCLUDE...
     SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE
     A FEW DAMAGING WIND GUSTS TO 60 MPH POSSIBLE
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 95
   STATUTE MILES EAST AND WEST OF A LINE FROM LEMMON SOUTH DAKOTA TO
   75 MILES SOUTH SOUTHWEST OF PHILIP SOUTH DAKOTA.  FOR A COMPLETE
   DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
   (WOUS64 KWNS WOU2).
   
   PRECAUTIONARY/PREPAREDNESS ACTIONS...
   
   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 170...WW 171...
   
   DISCUSSION...STORM COVERAGE IS IN THE PROCESS OF INCREASING
   NEAR/NORTH AND EAST OF THE BLACK HILLS AREA...WHERE STEEP LAPSE
   RATES ARE CONTRIBUTING TO A RISK FOR AT LEAST SEVERE HAIL...AIDED BY
   MODEST DEEP LAYER SHEAR BENEATH 30-40 KT SOUTHERLY 500 MB FLOW. 
   THIS ACTIVITY LIKELY WILL PERSIST INTO THE EVENING HOURS...BEFORE
   WEAKENING/SHIFTING EAST OF REGION.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
   MOTION VECTOR 24035.
   
   
   ...KERR

   SEL2
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 172
   NWS STORM PREDICTION CENTER NORMAN OK
   255 PM MDT SAT MAY 18 2013
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   
   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     WESTERN SOUTH DAKOTA
   
   * EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 255 PM UNTIL
     1000 PM MDT.
   
   * PRIMARY THREATS INCLUDE...
     SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE
     A FEW DAMAGING WIND GUSTS TO 60 MPH POSSIBLE
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 95
   STATUTE MILES EAST AND WEST OF A LINE FROM LEMMON SOUTH DAKOTA TO
   75 MILES SOUTH SOUTHWEST OF PHILIP SOUTH DAKOTA.  FOR A COMPLETE
   DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
   (WOUS64 KWNS WOU2).
   
   PRECAUTIONARY/PREPAREDNESS ACTIONS...
   
   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 170...WW 171...
   
   DISCUSSION...STORM COVERAGE IS IN THE PROCESS OF INCREASING
   NEAR/NORTH AND EAST OF THE BLACK HILLS AREA...WHERE STEEP LAPSE
   RATES ARE CONTRIBUTING TO A RISK FOR AT LEAST SEVERE HAIL...AIDED BY
   MODEST DEEP LAYER SHEAR BENEATH 30-40 KT SOUTHERLY 500 MB FLOW. 
   THIS ACTIVITY LIKELY WILL PERSIST INTO THE EVENING HOURS...BEFORE
   WEAKENING/SHIFTING EAST OF REGION.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
   MOTION VECTOR 24035.
   
   
   ...KERR

   WOUS64 KWNS 182051
   WOU2
   
   BULLETIN - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 172
   NWS STORM PREDICTION CENTER NORMAN OK
   255 PM MDT SAT MAY 18 2013
   
   SEVERE THUNDERSTORM WATCH 172 IS IN EFFECT UNTIL 1000 PM MDT
   FOR THE FOLLOWING LOCATIONS
   
   SDC007-019-033-047-055-063-071-081-093-095-103-105-113-121-137-
   190400-
   /O.NEW.KWNS.SV.A.0172.130518T2055Z-130519T0400Z/
   
   SD 
   .    SOUTH DAKOTA COUNTIES INCLUDED ARE
   
   BENNETT              BUTTE               CUSTER              
   FALL RIVER           HAAKON              HARDING             
   JACKSON              LAWRENCE            MEADE               
   MELLETTE             PENNINGTON          PERKINS             
   SHANNON              TODD                ZIEBACH             
   
   
   ATTN...WFO...UNR...
   
   
   

   SAW2 
   WW 172 SEVERE TSTM SD 182055Z - 190400Z
   AXIS..95 STATUTE MILES EAST AND WEST OF LINE..
   Y22/LEMMON SD/ - 75SSW PHP/PHILIP SD/
   ..AVIATION COORDS.. 85NM E/W /54NNW DPR - 67SSE RAP/
   HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..50 KNOTS.
   MAX TOPS TO 450. MEAN STORM MOTION VECTOR 24035.
   
   LAT...LON 45900019 43020029 43020405 45900415
   
   THIS IS AN APPROXIMATION TO THE WATCH AREA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
   FOR WOU2.
   

Watch 172 Status Report Messages:

STATUS REPORT #4 ON WW 172

VALID 190325Z - 190400Z

THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.

WW 172 WILL BE ALLOWED TO EXPIRE AT 190400Z.

FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 687

..MARSH..05/19/13

ATTN...WFO...UNR...

&&

STATUS REPORT FOR WS 172 

SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 

SDC007-019-033-047-055-063-071-081-093-095-103-105-113-121-123-
137-190400-

SD 
.    SOUTH DAKOTA COUNTIES INCLUDED ARE

BENNETT 	     BUTTE		 CUSTER 	     
FALL RIVER	     HAAKON		 HARDING	     
JACKSON 	     LAWRENCE		 MEADE		     
MELLETTE	     PENNINGTON 	 PERKINS	     
SHANNON 	     TODD		 TRIPP		     
ZIEBACH 	     
$$


THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY.  PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$

STATUS REPORT #3 ON WW 172

VALID 190035Z - 190140Z

THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.

..MARSH..05/19/13

ATTN...WFO...UNR...

&&

STATUS REPORT FOR WS 172 

SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 

SDC007-019-033-047-055-063-071-081-093-095-103-105-113-121-137-
190140-

SD 
.    SOUTH DAKOTA COUNTIES INCLUDED ARE

BENNETT 	     BUTTE		 CUSTER 	     
FALL RIVER	     HAAKON		 HARDING	     
JACKSON 	     LAWRENCE		 MEADE		     
MELLETTE	     PENNINGTON 	 PERKINS	     
SHANNON 	     TODD		 ZIEBACH	     
$$


THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY.  PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$

STATUS REPORT #2 ON WW 172

VALID 182345Z - 190040Z

THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.

..MARSH..05/18/13

ATTN...WFO...UNR...

&&

STATUS REPORT FOR WS 172 

SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 

SDC007-019-033-047-055-063-071-081-093-095-103-105-113-121-137-
190040-

SD 
.    SOUTH DAKOTA COUNTIES INCLUDED ARE

BENNETT 	     BUTTE		 CUSTER 	     
FALL RIVER	     HAAKON		 HARDING	     
JACKSON 	     LAWRENCE		 MEADE		     
MELLETTE	     PENNINGTON 	 PERKINS	     
SHANNON 	     TODD		 ZIEBACH	     
$$


THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY.  PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$

STATUS REPORT #1 ON WW 172

VALID 182230Z - 182340Z

THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.

..MARSH..05/18/13

ATTN...WFO...UNR...

&&

STATUS REPORT FOR WS 172 

SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 

SDC007-019-033-047-055-063-071-081-093-095-103-105-113-121-137-
182340-

SD 
.    SOUTH DAKOTA COUNTIES INCLUDED ARE

BENNETT 	     BUTTE		 CUSTER 	     
FALL RIVER	     HAAKON		 HARDING	     
JACKSON 	     LAWRENCE		 MEADE		     
MELLETTE	     PENNINGTON 	 PERKINS	     
SHANNON 	     TODD		 ZIEBACH	     
$$


THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY.  PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$

Please visit the National Weather Service Interactive Weather Information Network (IWIN) for more information on the warnings.

For each watch, probabilities for particular events inside the watch (listed above in each table) are determined by the issuing forecaster. The "Low" category contains probability values ranging from less than 2% to 20% (F2-F5 tornadoes), less than 5% to 20% (all other probabilities), "Moderate" from 30% to 60%, and "High" from 70% to greater than 95%. High values are bolded and lighter in color to provide awareness of an increased threat for a particular event.