550
FNUS75 KTWC 200120
FWSTWC
SPOT FORECAST FOR CATALINA PILES...USFS
NATIONAL WEATHER SERVICE TUCSON AZ
620 PM MST WED NOV 19 2025
FORECAST IS BASED ON IGNITION TIME OF 0800 MST ON NOVEMBER 20.
DISCUSSION
TWO WEATHER SYSTEMS WILL BE THE MAIN FOCUS FOR THE
FORECAST PERIOD. THE FIRST WEATHER SYSTEM WILL BEGIN TO EXIT
TODAY, RESULTING IN MORNING RAIN SHOWERS MIXED WITH SNOW SHOWERS.
THERE ARE SLIGHT CHANCES FOR AN EMBEDDED THUNDERSTORM IN THE
MORNING. SNOW LEVELS WILL BOTTOM OUT TO 6500 FEET THIS EARLY
MORNING AND SLOWLY CLIMB UP TO 7500 FEET BY MID-DAY. RAIN SHOWERS
AND SNOW SHOWERS CHANCES WILL DRAMATICALLY DECREASE AFTER NOON
TODAY. WINDS WILL BE SOUTHWESTERLY UP TO 11 MPH AND BECOMING LIGHT
IN THE OVERNIGHT PERIOD. THE SECOND WEATHER SYSTEM WILL IMPACT
THE REGION LATE ON FRIDAY, BRINGING MORE CHANCES FOR RAIN SHOWERS
AND SNOW SHOWERS INTO THE WEEKEND.
THURSDAY
SKY/WEATHER.........MOSTLY CLOUDY THEN BECOMING MOSTLY SUNNY. RAIN
SHOWERS, MIXED WITH SNOW SHOWERS, AND SLIGHT
CHANCE FOR THUNDERSTORM IN THE MORNING,
THEN DECREASING CHANCES AFTER 1200 HOURS.
CHANCE OF PCPN......70 PERCENT DECREASING TO 0 PERCENT.
MAX TEMPERATURE.....39-42 DEGREES.
MIN HUMIDITY........85-88 PERCENT.
20-FOOT WINDS.......SOUTHWEST WINDS 6 TO 11 MPH IN THE MORNING BECOMING
WEST AFTER 1200 HOURS GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS EARLY IN THE
MORNING.
MIXING HEIGHT.......300 FT AGL.
TRANSPORT WINDS.....WEST 8 TO 14 KNOTS.
TIME (MST) 8 AM 11 AM 2 PM 5 PM
SKY (%).........78 83 76 39
WEATHER COV.....LIKELY CHANCE
WEATHER TYPE....SNSHWR SNSHWR NONE NONE
TSTM COV........
CWR.............60 30 0 0
TEMP............36 37 38 36
RH..............94 100 93 89
20 FT WIND......SW 8G13 SW-W 8G13 W 7G12 W 5G8
MIX HGT (FT)....BLW100 BLW100 300 BLW100
TRANSPORT WIND..SW 14 W 13 W 11 W 8
THURSDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
CHANCE OF PCPN......0 PERCENT.
MIN TEMPERATURE.....31-34 DEGREES.
MAX HUMIDITY........97-100 PERCENT.
20-FOOT WINDS.......WEST-SOUTHWEST WINDS 5 TO 9 MPH SHIFTING TO
DRAINAGE FLOW AT 2 TO 6 MPH AFTER MIDNIGHT.
MIXING HEIGHT.......100 FT AGL.
TRANSPORT WINDS.....WEST 6 TO 7 KNOTS SHIFTING TO THE SOUTH
OVERNIGHT.
TIME (MST) 6 PM 9 PM MIDNGT 3 AM
SKY (%).........13 12 31 52
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0
TEMP............34 33 33 33
RH..............98 88 80 83
20 FT WIND......W 4G7 SW 4G6 SW 5G7 S 5G8
MIX HGT (FT)....BLW100 BLW100 BLW100 BLW100
TRANSPORT WIND..W 6 W 7 SW 6 S 6
FRIDAY
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN SHOWERS
LATE IN THE AFTERNOON.
CHANCE OF PCPN......10 PERCENT INCREASING TO 20 PERCENT LATE IN THE
AFTERNOON.
MAX TEMPERATURE.....45-48 DEGREES.
MIN HUMIDITY........50-53 PERCENT.
20-FOOT WINDS.......SOUTHEAST WINDS 6 TO 12 MPH WITH GUSTS UP TO 18 MPH
THEN SHIFTING SOUTH AFTER 1400 HOURS AT 5 TO 9 MPH.
MIXING HEIGHT.......1400 FT AGL INCREASING TO 2900 FT AGL LATE IN
THE AFTERNOON, THEN DECREASING TO 100 FT AGL
LATE IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH 7 TO 13 KNOTS.
TIME (MST) 6 AM 9 AM NOON 3 PM
SKY (%).........66 68 75 69
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 10 10
TEMP............33 38 44 45
RH..............80 70 57 53
20 FT WIND......SE 6G10 SE 8G14 SE 8G13 S 6G10
MIX HGT (FT)....BLW100 200 1400 1900
TRANSPORT WIND..S 7 SE 9 S 12 S 11
FORECAST DAYS 3 THROUGH 5
SATURDAY
MOSTLY CLOUDY. CHANCE OF SHOWERS AND SNOW SHOWERS. LOWS IN THE
UPPER 30S. HIGHS IN THE UPPER 40S. SOUTHEAST WINDS AROUND 6 MPH.
SUNDAY
MOSTLY CLOUDY. CHANCE OF SHOWERS AND SNOW SHOWERS. LOWS IN THE
UPPER 30S. HIGHS IN THE MID 40S. SOUTHWEST WINDS AROUND 5 MPH.
MONDAY
MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS AROUND 50. LIGHT WINDS.
FORECASTER...STRONGMAN
REQUESTED BY...CHAD RICE
TYPE OF REQUEST...PRESCRIBED
.TAG 2526431.0/TWC
.DELDT 11/19/25
.FORMATTERVERSION 2.0.0
.EMAIL CHAD.RICE@USDA.GOV
VISIT US ON FACEBOOK...TWITTER...YOUTUBE...AND AT WEATHER.GOV/TUCSON
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page