000 
FNUS75 KCYS 211554
FWSCYS

SPOT FORECAST FOR RAINBOW VALLEY 1.1 BURN......BLM
NATIONAL WEATHER SERVICE NWFO CHEYENNE
954 AM MDT MON APR 21 2003

VALID UNTIL 554 PM MDT MON APR 21 2003
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER SERVICE.

DISCUSSION...NARROW UPPER RIDGE OVER EASTERN WYOMING WILL SHIFT EAST
TODAY.  SOUTHWEST FLOW ALOFT OVER BURN AREA WILL BECOME INCREASINGLY
MOIST AHEAD OF STRONG UPPER LOW DIVING INTO SOUTHWEST UNITED STATES.
THIS LOW WILL BRING COOL AND WET WEATHER TO BURN AREA MAINLY FOR
WEDNESDAY AND THURSDAY.  AHEAD OF THIS...THERE WILL BE A FEW SHOWERS
AND THUNDERSTORMS BY THIS EVENING WITH A BETTER CHANCE OF THESE
TUESDAY AFTERNOON.

FOR PLANNED IGNITION TIME OF 1000 MDT 4/21/03
   SKY / WEATHER.......SUNNY THIS MORNING.  PARTLY CLOUDY IN THE
                       AFTERNOON WITH WIDELY SCATTERED THUNDERSTORMS.
   TEMPERATURE.........MAX 52 TO 55.
   RH..................MIN 28 TO 33%.
   20 FOOT WIND........SOUTH TO SOUTHEAST INCREASING TO 10 TO 20 MPH.
   CWR.................10%.
   LAL.................2.
   HAINES INDEX........4.
   MIXING HEIGHT.......8000 FEET AGL.
   MIXING WINDS........SOUTH 10 TO 15 MPH.
   SMOKE DISPERSAL.....BECOMING EXCELLENT BY MIDDAY.

FOR TONIGHT
   SKY / WEATHER.......PARTLY CLOUDY WITH WIDELY SCATTERED EVENING
                       SHOWERS AND THUNDERSTORMS.
   TEMPERATURE.........MIN 29 TO 32.
   RH..................MAX 90 TO 95%.
   20 FOOT WIND........SOUTHEAST 10 TO 20 MPH.
   CWR.................20%.
   LAL.................2.
   HAINES INDEX........4.
   MIXING HEIGHT.......DECREASING TO 1000 FEET AGL.
   MIXING WINDS........SOUTHEAST 10 MPH.
   SMOKE DISPERSAL.....BECOMING POOR BY MIDNIGHT.

OUTLOOK FOR TOMORROW
   SKY / WEATHER.......MOSTLY CLOUDY WITH SCATTERED MAINLY AFTERNOON
                       SHOWERS AND THUNDERSTORMS.
   TEMPERATURE.........MAX 54 TO 57.
   RH..................MIN 33 TO 38%.
   20 FOOT WIND........SOUTHEAST 15 TO 25 MPH.
   CWR.................30%.
   LAL.................2.
   HAINES INDEX........4.
   MIXING HEIGHT.......9000 FEET AGL.
   MIXING WINDS........SOUTHEAST 15 MPH.
   SMOKE DISPERSAL.....BECOMING EXCELLENT BY LATE MORNING.

FORECASTER...JLH

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