FNUS75 KGGW 052329
FWSGGW

SPOT FORECAST FOR TIN CAN HILL UNIT B...LEWISTOWN DISPATCH
NATIONAL WEATHER SERVICE GLASGOW MT
529 PM MDT THU MAY 5 2011

FORECAST IS BASED ON IGNITION TIME OF 1700 MDT ON MAY 05.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...CURRENT RH VALUE FROM NEARBY BY OBSERVATION SITES AT
WINNETT AND DRY BLOOD CREEK ARE 14% AND ARE CONSISTENT WITH OTHER
FIXED OBSERVING SITES IN THE AREA.  VERY LOW SURFACE MOISTURE IS THE
RESULT OF DRY AIR MIXING DOWN TO THE SURFACE THIS AFTERNOON.  RH VALUES
SHOULD GRADUALLY RECOVER THIS EVENING.  A WEAK STORM SYSTEM
IS BEGINNING TO AFFECT THE AREA FROM THE WEST GENERATING INCREASING CLOUD
COVER AND GIVING A CHANCE FOR SOME SHOWERS LATER TONIGHT.

WINDS ARE CURRENTLY LIGHT AND SOUTHWESTERLY TO NORTHWESTERLY.  A WEAK FRONTAL
FEATURE HAS JUST PASSED THROUGH THE AREA AND WESTERLY WINDS ARE EXPECTED TO
INCREASE TO 10 TO 15 KTS THIS EVENING THROUGH MIDNIGHT TONIGHT.

FRIDAY WILL BE COOLER WITH CONTINUED GUSTY NORTHWEST WINDS.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT). A CHANCE
                    OF SHOWERS.
MIN TEMPERATURE.....42-47.
MAX HUMIDITY........59-64 PERCENT.
WIND (20 FT)........WEST WINDS 8 TO 13 MPH WITH GUSTS TO AROUND 25
                    MPH.
CWR.................10 PERCENT.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........WEST AROUND 18 MPH.

.FRIDAY...
SKY/WEATHER.........MOSTLY CLOUDY (55-65 PERCENT). A SLIGHT CHANCE
                    OF RAIN SHOWERS.
MAX TEMPERATURE.....63-68.
MIN HUMIDITY........23-28 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 14 TO 19 MPH WITH GUSTS TO
                    AROUND 35 MPH.
CWR.................LESS THAN 10 PERCENT.
MIXING HEIGHT.......10100 FT AGL.
MIXING WINDS........NORTHWEST AROUND 37 MPH.

$$
FORECASTER...MARTIN
REQUESTED BY...JOSH BARTA
TYPE OF REQUEST...PRESCRIBED
.TAG 20110505.TINCA.03/GGW