FNUS75 KSLC 210009
FWSSLC

SPOT FORECAST FOR RAILROAD RX
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
609 PM MDT THU MAY 20 2010

.DISCUSSION...A WEAK DISTURBANCE WILL MOVE ACROSS NORTHERN UTAH
THIS EVENING FOLLOWED BY A SHORTWAVE RIDGE FOR LATER TONIGHT
AND EARLY FRIDAY. THIS SHORTWAVE RIDGE WILL HELP STRENGTHEN THE
SURFACE HIGH OVER EASTERN IDAHO AND WESTERN WYOMING TO KEEP A
SHALLOW NORTHERLY FLOW AT THE BURN SITE THROUGH THE DAY FRIDAY.
ANOTHER WEAK DISTURBANCE WILL MOVE NORTHEAST ACROSS NORTHERN UTAH
FRIDAY AROUND MIDDAY PRODUCING A HEAVIER CLOUD COVER AND A CHANCE
OF SHOWERS. A STRONGER SYSTEM WILL MOVE IN FRIDAY
NIGHT BRINGING MORE MOISTURE AND COOLER TEMPERATURES WITH IT.
A STRONGER NORTHWEST SURFACE GRADIENT IS EXPECTED SATURDAY WHICH
COULD CAUSE WINDS TO BECOME BREEZY FROM THE NORTHWEST.

.TONIGHT...
LAL...................1.
HAINES INDEX..........3 ..VERY LOW.
SKY/WEATHER...........PARTLY CLOUDY (20-40 PERCENT CLOUD COVER).
MIN TEMPERATURE.......46-48.
MAX HUMIDITY..........63-65 PERCENT.
WIND (20 FT)..........NORTHEAST WINDS 10 TO 15 MPH DECREASING TO
                      5-8 MPH LATE IN THE NIGHT.

.FRIDAY...
LAL...................1 UNTIL NOON...THEN 2.
HAINES INDEX..........3 ..VERY LOW.
CLEARING INDEX........450.
SKY/WEATHER...........BECOMING MOSTLY CLOUDY (65-85 PERCENT CLOUD COVER). A
                      SLIGHT CHANCE OF SHOWERS BEGINNING AROUND NOON...THEN A
                      CHANCE OF SHOWERS AND A SLIGHT CHANCE OF
                      THUNDERSTORMS.
MAX TEMPERATURE.......64-67.
MIN HUMIDITY..........24-30 PERCENT.
WIND (20 FT)..........NORTHEAST TO EAST WINDS 5-8 MPH SHIFTING TO THE
                      NORTH OR NORTHWEST LATE IN THE MORNING.

.OUTLOOK FOR SATURDAY...
LAL...................1.
HAINES INDEX..........3 ..VERY LOW.
CLEARING INDEX........1000+.
SKY/WEATHER...........MOSTLY CLOUDY (75-85 PERCENT CLOUD COVER). A
                      CHANCE OF SHOWERS.
MAX TEMPERATURE.......50-54.
MIN HUMIDITY..........40-42 PERCENT.
WIND (20 FT)..........NORTHWEST WINDS 10 MPH IN THE MORNING INCREASING
                      TO 15-20 MPH IN THE AFTERNOON.



FORECASTER...STRUTHWOLF
REQUESTED BY...BROOK CHADWICK
REASON FOR REQUEST...PRESCRIBED
.TAG 20100521.RAILR.01/SLC

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