398
FNUS75 KTWC 261743
FWSTWC
SPOT FORECAST FOR BORDER I RX...USFS
NATIONAL WEATHER SERVICE TUCSON AZ
1043 AM MST THU MAR 26 2026
FORECAST IS BASED ON IGNITION TIME OF 0700 MST ON MARCH 27.
DISCUSSION
A PATTERN CHANGE WILL RESULT IN THE POTENTIAL FOR
BRIEF NEAR CRITICAL FIRE WEATHER CONDITIONS FRIDAY AFTERNOON.
BREEZY EASTERLY WINDS PICK UP ON FRIDAY AFTERNOON (10 TO 15 MPH,
GUSTS 25 TO 30 MPH) BUT WILL BE ACCOMPANIED BY A GRADUAL INCREASE
IN MOISTURE FROM THE SINGLE DIGITS INTO THE MID TO UPPER TEENS.
RIDGETOPS WILL SEE STRONGER WINDS. STRONGER WINDS ARE EXPECTED
FRIDAY EVENING INTO SATURDAY MORNING (15 TO 20 MPH, GUSTS 30 TO 35
MPH) FOLLOWING THE PASSAGE OF A COLD FRONT. THE MOISTURE INCREASE
WILL RESULT IN A SLIGHT CHANCE (10-15%) FOR MAINLY DRY THUNDERSTORMS
WITH LITTLE TO NO PRECIPITATION EXPECTED. AFTERNOON RHS ON
SATURDAY WILL BE ABOVE 20 PERCENT.
FRIDAY
SKY/WEATHER.........SUNNY.
CHANCE OF PCPN......0 PERCENT.
MAX TEMPERATURE.....83-86 DEGREES.
MIN HUMIDITY........6-9 PERCENT.
20-FOOT WINDS.......NORTHEAST WINDS 5 TO 10 MPH IN THE MORNING
BECOMING EASTERLY AT 10 TO 15 MPH IN THE
AFTERNOON. GUSTS TO AROUND 25 TO 30 MPH IN THE AFTERNOON.
MIXING HEIGHT.......400 FT AGL INCREASING TO 9700 FT AGL LATE IN THE
AFTERNOON DECREASING TO 5600 FT AGL.
SMOKE DISPERSAL.....POOR (0 KNOT-FT) INCREASING TO GOOD (66700
KNOT-FT) EARLY IN THE MORNING INCREASING TO
VERY GOOD (97000 KNOT-FT) IN THE AFTERNOON.
2
TIME (MST) 7 AM 10 AM 1 PM 4 PM
SKY (%).........7 7 5 13
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0
TEMP............62 77 83 83
RH..............13 9 7 9
20 FT WIND......N 3G8 E 5G10 E 10G20 E 12G25
MIX HGT (FT)....BLW100 2000 8400 8500
VRATE KT-FT/1K..0 14 76 85
VENTRATE CAT....POOR MRGL VYGD VYGD
FRIDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY.
CHANCE OF PCPN......0 PERCENT.
MIN TEMPERATURE.....48-51 DEGREES.
MAX HUMIDITY........45-48 PERCENT.
20-FOOT WINDS.......BREEZY. EASTERLY WINDS WILL INCREASE TO
AROUND 20 TO 25 MPH WITH GUSTS 30 TO 35 MPH.
MIXING HEIGHT.......100 FT AGL.
SMOKE DISPERSAL.....FAIR (22400 KNOT-FT) DECREASING TO POOR (0
KNOT-FT).
TIME (MST) 6 PM 9 PM MIDNGT 3 AM
SKY (%).........21 36 32 31
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0
TEMP............77 65 58 52
RH..............15 24 32 42
20 FT WIND......E 11G19 E 17G28 E 20G31 E 20G31
MIX HGT (FT)....1500 BLW100 BLW100 BLW100
VRATE KT-FT/1K..22 0 0 0
VENTRATE CAT....FAIR POOR POOR POOR
SATURDAY
SKY/WEATHER.........MOSTLY SUNNY THEN BECOMING MOSTLY CLOUDY.
CHANCE OF PCPN......10 PERCENT.
MAX TEMPERATURE.....72-75 DEGREES.
MIN HUMIDITY........21-24 PERCENT.
20-FOOT WINDS.......BREEZY. EAST WINDS 15 TO 20 MPH WITH GUSTS TO
AROUND 30 MPH DECREASING TO 5 TO 10 MPH LATE IN
THE AFTERNOON.
MIXING HEIGHT.......1800 FT AGL INCREASING TO 2200 FT AGL LATE IN
THE AFTERNOON.
SMOKE DISPERSAL.....POOR (0 KNOT-FT) EARLY IN THE MORNING
INCREASING TO MARGINAL (9300 KNOT-FT) IN THE
AFTERNOON INCREASING TO MARGINAL (9700 KNOT-FT)
LATE IN THE MORNING.
TIME (MST) 6 AM 9 AM NOON 3 PM
SKY (%).........35 42 55 75
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0
TEMP............51 58 68 73
RH..............45 36 27 23
20 FT WIND......E 20G30 E 17G26 E 9G18 E 6G13
MIX HGT (FT)....BLW100 300 1400 2200
VRATE KT-FT/1K..0 6 14 16
VENTRATE CAT....POOR POOR MRGL MRGL
FORECASTER...VAN STRATTEN
REQUESTED BY...WES GUTWEILER
TYPE OF REQUEST...PRESCRIBED
.TAG 2605957.4/TWC
.DELDT 03/26/26
.FORMATTERVERSION 2.0.0
.EMAIL KEVIN.COOPER2@USDA.GOV,BEAU.CARTWRIGHT@USDA.GOV,WESLEY.GUTWEILER@USDA.GOV,STEVEN.MCMURTRIE@USDA.GOV
VISIT US ON FACEBOOK...TWITTER...YOUTUBE...AND AT WEATHER.GOV/TUCSON
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page