MESOSCALE DISCUSSION 0666
   NWS STORM PREDICTION CENTER NORMAN OK
   0235 PM CDT THU MAY 03 2007
   
   AREAS AFFECTED...ERN MT
   
   CONCERNING...SEVERE POTENTIAL...WATCH NEEDED SOON 
   
   VALID 031935Z - 032000Z
   
   ENVIRONMENTAL CONDITIONS HAVE BECOME FAVORABLE FOR SEVERE STORMS AND
   A WATCH ISSUANCE WILL BE COORDINATED BETWEEN THE SPC AND THE
   AFFECTED LOCAL NATIONAL WEATHER SERVICE OFFICES SHORTLY.
   
   STRONG TO SEVERE TSTMS HAVE RAPIDLY DEVELOPED E/NE OF BIL IN ADVANCE
   OF NRN ROCKIES SHORT WAVE TROUGH AND A SURFACE COLD FRONT NOW
   STRETCHING FROM AROUND 20 W GGW TO 30 W MLS TO NEAR SHR. ALTHOUGH
   BILLINGS VAD PROFILER INDICATES LOW-LEVEL WLY FLOW FROM THE SFC TO
   1-KM BEHIND THE FRONT...DEEP-LAYER SPEED SHEAR IS FAVORABLE FOR
   ROTATING ELEVATED STORMS WITH LARGE HAIL. A WW WILL BE ISSUED
   SHORTLY.
   
   ..GRAMS.. 05/03/2007
   
   
   ATTN...WFO...UNR...BYZ...GGW...RIW...TFX...
   
   47790568 47280535 45840485 45120491 44660558 44510636
   44890752 45900809 46720825 47670836 48270793 48630739
   48700673 48590632