FNUS75 KSLC 231212 FWSSLC SPOT FORECAST FOR PRETTY TREE RX NATIONAL WEATHER SERVICE SALT LAKE CITY UT 612 AM MDT TUE APR 23 2013 .DISCUSSION...A COLD AND DRY AIRMASS IS CURRENTLY IN PLACE ACROSS THE REGION. SURFACE RIDGING IS BUILDING AND WILL CONTINUE FOR MUCH OF THE UPCOMING WEEK. TRANSPORT WINDS SHOULD BE STRONG ENOUGH FOR GOOD MIXING THIS MORNING AND INTO EARLY AFTERNOON BUT ARE EXPECTED TO WEAKEN SIGNIFICANTLY BY LATE AFTERNOON. LIGHT WINDS COUPLED WITH ATMOSPHERIC STABILITY WILL LIKELY KEEP CLEARING INDICES LOW BEGINNING WEDNESDAY DESPITE THE PASSAGE OF A FEW WEAK STORM SYSTEMS LATER IN THE WEEK. THE DRY AIRMASS WILL REMAIN IN PLACE...KEEPING RH VALUES GENERALLY LOW. .TODAY... LAL.................1. HAINES INDEX........4 ..LOW. CLEARING INDEX......1000 IN THE MORNING AND EARLY AFTERNOON... DROPPING TO NEAR 500 IN THE MID TO LATE AFTERNOON SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT CLOUD COVER) UNTIL NOON...THEN MOSTLY SUNNY (15-25 PERCENT CLOUD COVER). MAX TEMPERATURE.....43-47. MIN HUMIDITY........13-17 PERCENT. WINDS - 20-FOOT.....BREEZY IN THE MORNING TO EARLY AFTERNOON. NORTHWEST WINDS 15 TO 25 MPH WITH GUSTS TO AROUND 30 MPH DECREASING TO 5-10 MPH BY MID TO LATE AFTERNOON. .TONIGHT... LAL.................1. HAINES INDEX........3 ..VERY LOW. SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT CLOUD COVER). MIN TEMPERATURE.....24-28. MAX HUMIDITY........32-36 PERCENT. WINDS - 20-FOOT.....NORTH WINDS 10 MPH SHIFTING TO THE WEST LATE IN THE EVENING...THEN SHIFTING TO THE SOUTH AFTER MIDNIGHT. .OUTLOOK FOR WEDNESDAY... LAL.................1. HAINES INDEX........4 ..LOW. CLEARING INDEX......320. SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT CLOUD COVER) THEN BECOMING PARTLY CLOUDY (30-40 PERCENT CLOUD COVER). MAX TEMPERATURE.....49-53. MIN HUMIDITY........11-15 PERCENT. WINDS - 20-FOOT.....SOUTHWEST WINDS 5 MPH SHIFTING TO THE EAST IN THE LATE MORNING AND AFTERNOON. FORECASTER...VERZELLA REQUESTED BY...CHANCE STEWART REASON FOR REQUEST...PRESCRIBED .TAG 20130423.PRETT.02/SLC $$