744 
FXUS65 KRIW 030829
AFDRIW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
228 AM MDT THU JUN 3 1999

LATEST SURFACE CHART SHOWS LOW PRESSURE IN CENTRAL MT WITH A PACIFIC
COLD FRONT TRAILING SW THROUGH IDAHO. KRIW RADAR DETECTING LIGHT
SHOWERS OVER THE WIND RIVER MTNS AND YNP. WATER VAPOR IMAGERY PLACES
THE UPPER LOW OVER CENTRAL CA. A SHORTWAVE WAS LIFTING NORTHEAST OUT
OF WYOMING EARLY THIS MORNING.

THE ETA/AVN ARE SIMILAR WITH MAIN FEATURES BUT DIFFER ON PLACEMENT OF
THE SURFACE LOW BY 48 HOURS. THE ETA PLACES IT IN SCNTRL CO AND THE
AVN HAS IT IN NORTHERN COLORADO. THE UPPER LOW CONTINUES TO DIG SOUTH
INTO SOUTHERN CA BY 48 HOURS. AT THE SURFACE THE CURRENT LOW MOVES
INTO EASTERN MT TODAY AND THEN INTO SOUTHERN CANADA TONIGHT. ON FRIDAY
A SURFACE HIGH BEGINS TO RIDGE IN FROM THE WEST WITH ANOTHER LOW
DEVELOPING IN COLORADO BY FRIDAY NIGHT. THE BEST LAYER MEAN RH REMAINS
OVER THE WRN MTNS/VALLEYS THROUGH TONIGHT WITH BEST INSTABILITY AND
UVVS THERE. ON FRIDAY MOISTURE IS FOCUS MAINLY OVER THE NORTHWEST MTNS
WITH BEST LIFT AND INSTABILITY OVER YNP AND JAC AREAS. BREEZY AREAS
TODAY AND TONIGHT MAINLY IN EAST FA.

FOR TEMPERATURES WILL GO WITH BLEND OF FWC/FAN. 

.RIW...NONE
FS