FNUS75 KFGZ 121138
FWSFGZ

SPOT FORECAST FOR TIPOVER...GNP GRAND CANYON NP
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
438 AM MST FRI AUG 12 2011

FORECAST IS BASED ON REQUEST TIME OF 2110 MST ON AUGUST 11.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...RELATIVELY DRY WESTERLY FLOW WILL DOMINATE THE AIR MASS
OVER THE TIPOVER WILDFIRE TODAY. EXPECT A BETTER CHANCE FOR SHOWERS AND
THUNDERSTORMS ON SATURDAY AS MOIST SOUTHERLY FLOW DEVELOPS ACROSS THE
AREA. WINDS WILL REMAIN ON THE LIGHT SIDE BUT WITH DEEP MIXING AFTERNOON
VENTILATION WILL GENERALLY RANGE FROM FAIR TO GOOD.


.TODAY...

SKY/WEATHER.........PARTLY CLOUDY.
MAX TEMPERATURE.....AROUND 76.
MIN HUMIDITY........22 PCT.
WINDS (20 FT).......LIGHT AND VARIABLE WINDS UNTIL 0900 LST BECOMING
                    SOUTHWEST AROUND 5 MPH BY THE AFTERNOON.
LAL.................1.
HAINES INDEX........4 LOW.
MAX VENT RATE.......FAIR (36500 KNOT-FT).
CLEARING INDEX......365.

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND
                    THUNDERSTORMS AFTER MIDNIGHT.
MIN TEMPERATURE.....AROUND 48.
MAX HUMIDITY........65 PCT.
WINDS (20 FT).......WEST WINDS AROUND 5 MPH UNTIL 2000 LST BECOMING
                    LIGHT AND VARIABLE.
LAL.................2.
HAINES INDEX........4 LOW.
MIN VENT RATE.......POOR (1200 KNOT-FT).
CLEARING INDEX......12.

.SATURDAY...

SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND
                    THUNDERSTORMS IN THE MORNING...THEN CHANCE OF
                    SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....AROUND 73.
MIN HUMIDITY........30 PCT.
WINDS (20 FT).......LIGHT AND VARIABLE WINDS UNTIL 0800 LST BECOMING SOUTH
                    AROUND 5 MPH BY THE AFTERNOON.
LAL.................3.
HAINES INDEX........3 VERY LOW.
MAX VENT RATE.......GOOD (47100 KNOT-FT).
CLEARING INDEX......471.

$$
FORECASTER...MCCOLLUM
REQUESTED BY...MATTHEW DANIEL
REASON FOR REQUEST...WILDFIRE
.TAG 20110811.TIPOV.01/FGZ