FNUS75 KSLC 050530
FWSSLC

SPOT FORECAST FOR RIDGES
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1130 PM MDT SAT AUG 4 2012

.DISCUSSION...A RIDGE OF HIGH PRESSURE OVER WYOMING AND LOW
PRESSURE OVER NEVADA WILL ENHANCE THE EASTERLY FLOW ACROSS THE
WASATCH MOUNTAINS TONIGHT. THE EASTERLY DOWNSLOPE WINDS WILL
LIKELY PEAK BETWEEN 0300 AND 0900 MDT. DUE TO THIS DOWN SLOPING
COMPONENT THE RH HAS DECREASED OVER THE PAST HOUR AND IS LIKELY TO
REMAIN IN THE TEENS THROUGH MOST OF THE NIGHT WITH PERHAPS A
RECOVERY INTO THE MID 20S IF THE WINDS SUBSIDE AT TIMES.

A TROUGH AXIS WILL SWEEP NORTHWARD ACROSS NORTHERN UTAH SUNDAY
AFTERNOON AND EVENING WHICH WILL CREATE THUNDERSTORMS...WHICH ARE
EXPECTED TO BE OF THE DRY LIGHTNING VARIETY. STRONG ERRATIC WINDS
IN EXCESS OF 40 MPH ARE POSSIBLE WITH ANY OF THESE STORMS. RH
RECOVERY OF UP TO 40-50 PERCENT IS POSSIBLE SUNDAY MORNING WHEN
THE WINDS SHIFT TO UP SLOPE BUT THIS INCREASE IN RH WILL BE
TEMPORARY OF LESS THAN AN HOUR OR TWO AS DRY AIR FROM ALOFT MIXES
RAPIDLY INTO THIS SURFACE LAYER.

.REST OF TONIGHT...
  LAL.................1.
  HAINES INDEX........5 ..MODERATE.
  SKY/WEATHER.........HIGH CLOUDS (65-85 PERCENT CLOUD COVER).
  MIN TEMPERATURE.....63-67.
  MAX HUMIDITY........21-25 PERCENT.
  WINDS - 20-FOOT.....EAST WINDS 5 TO 10 MPH INCREASING TO 15 MPH
                      LATE IN THE NIGHT.

.SUNDAY...
  LAL.................1 UNTIL 1600...THEN 2.
  HAINES INDEX........5 ..MODERATE.
  CLEARING INDEX......1000+.
  SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT CLOUD COVER). A
                      CHANCE OF DRY THUNDERSTORMS AFTER 1600.
  MAX TEMPERATURE.....93-95.
  MIN HUMIDITY........13-17 PERCENT.
  WINDS - 20-FOOT.....EAST WINDS 5 MPH SHIFTING TO THE WEST AROUND
                      1000...THEN SHIFTING TO THE SOUTHWEST
                      EARLY IN THE AFTERNOON. POTENTIAL FOR WIND GUSTS
                      IN EXCESS OF 40 MPH WITH ANY THUNDERSTORM LATE
                      IN THE AFTERNOON AND EVENING.

.OUTLOOK FOR MONDAY...
  LAL.................2 UNTIL NOON...THEN 1.
  HAINES INDEX........4 ..LOW.
  CLEARING INDEX......1000+.
  SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT CLOUD COVER). A
                      SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS IN
                      THE MORNING.
  MAX TEMPERATURE.....92-94.
  MIN HUMIDITY........20-22 PERCENT.
  WINDS - 20-FOOT.....EAST WINDS 10 MPH BECOMING NORTHWEST 5 MPH IN
                      THE AFTERNOON.



FORECASTER...STRUTHWOLF
REQUESTED BY...DAVE VICKERS
REASON FOR REQUEST...WILDFIRE
.TAG 20120804.RIDGE.01/SLC

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