FNUS75 KSLC 251132
FWSSLC

SPOT FORECAST FOR RAILROAD RX
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
532 AM MDT THU APR 25 2013

.DISCUSSION...HIGH PRESSURE WILL CONTINUE TO BUILD OVER THE AREA
TODAY...BECOMING STRONGER THROUGH THE WEEKEND. MIXING WILL BE
MARGINAL TODAY. SURFACE INVERSION LOOKS TO ERODE THIS AFTERNOON
THOUGH MIXING HEIGHTS REMAIN RELATIVELY SHALLOW. BEST MIXING IS
EXPECTED DURING THE LATE AFTERNOON AND MAY APPROACH 500 AT THIS
TIME. HOWEVER...TRANSPORT WINDS ARE EXPECTED TO REMAIN QUITE
LIGHT. STABILITY IS EXPECTED TO INCREASE TOMORROW...THOUGH MIXING
COULD STILL BE MARGINAL. AIRMASS BECOMES QUITE STABLE OVER THE
WEEKEND AS HIGH PRESSURE BECOMES DOMINANT OVER THE AREA.

.TODAY...
  LAL.................1.
  HAINES INDEX........5 ..MODERATE.
  CLEARING INDEX......450.
  SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT CLOUD COVER).
  MAX TEMPERATURE.....63-67.
  MIN HUMIDITY........6-10 PERCENT.
  WINDS - 20-FOOT.....UPSLOPE/UPVALLEY WINDS 3-7 MPH.

.TONIGHT...
  LAL.................1.
  HAINES INDEX........4 ..LOW.
  SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT CLOUD COVER).
  MIN TEMPERATURE.....39-43.
  MAX HUMIDITY........38-42 PERCENT.
  WINDS - 20-FOOT.....DOWNSLOPE/DOWNVALLEY WINDS UP TO 5 MPH.

.OUTLOOK FOR FRIDAY...
  LAL.................1.
  HAINES INDEX........3 ..VERY LOW.
  CLEARING INDEX......400.
  SKY/WEATHER.........MOSTLY SUNNY (5-15 PERCENT CLOUD COVER).
  MAX TEMPERATURE.....66-70.
  MIN HUMIDITY........7-11 PERCENT.
  WINDS - 20-FOOT.....UPSLOPE/UPVALLEY WINDS UP TO 5 MPH.



FORECASTER...TRAPHAGAN
REQUESTED BY...ERIC LAMALFA
REASON FOR REQUEST...PRESCRIBED
.TAG 20130425.RAILR.01/SLC

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