723
FNUS76 KSGX 221245
FWSSGX
SPOT FORECAST FOR GRAND IC...SAN MARCOS EM
NATIONAL WEATHER SERVICE SAN DIEGO CA
445 AM PST THU JAN 22 2026
FORECAST IS BASED ON FORECAST START TIME OF 0600 PST ON JANUARY 22.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
INCREASING HUMIDITY TODAY WITH WEAK WESTERLY WINDS. INCREASING
CHANCE OF RAIN TODAY WITH A 15-30% CHANCE THROUGH SATURDAY.
SLIGHTLY STRONGER WESTERLY BREEZES FRIDAY. NO HAZARDOUS WEATHER
OR STRONG WINDS EXPECTED THROUGH FRIDAY.
TODAY
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). PATCHY FOG EARLY
IN THE MORNING. SLIGHT CHANCE OF RAIN SHOWERS
EARLY IN THE MORNING, THEN CHANCE OF RAIN
SHOWERS IN THE LATE MORNING AND AFTERNOON.
MAX TEMPERATURE.....AROUND 64.
MIN HUMIDITY........69 PERCENT.
SURFACE WINDS (MPH).LIGHT WINDS.
CHANCE OF PCPN......30 PERCENT.
MIXING HEIGHT.......1600 FT AGL.
MIXING WINDS........NORTHEAST 1 TO 3 MPH SHIFTING TO THE WEST 2 TO
7 MPH IN THE LATE MORNING AND AFTERNOON.
TIME (PST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........86 82 82 82 82 82 82 86 86 86 71 71
WEATHER COV.....SCH SCH SCH SCH CHC CHC CHC CHC CHC CHC CHC CHC
WEATHER TYPE....RNF RNF RNF RNF RW RW RW RW RW RW RW RW
TSTM COV........
TEMP............51 51 52 57 61 63 64 64 64 63 62 59
RH..............96 95 96 84 75 71 71 69 69 74 75 82
SURFACE WND DIR.E E E E N W W W W W W W
SURFACE WND SPD.3 3 3 3 3 3 4 6 6 6 4 3
SURFACE WND GST.8 9 7 6 7 8 10 12 12 12 9 9
MIX HGT (KFT)...0.3 0.2 0.3 0.6 1.1 1.5 1.6 1.6 1.5 1.3 1.2 0.9
MIXING WIND DIR.NE E E NE W W W W W W NW W
MIXING WIND SPD.3 2 2 1 2 5 6 6 7 6 5 2
CHC OF PCPN (%).20 20 20 20 30 30 30 30 30 30 30 30
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING
PARTLY CLOUDY (60-70 PERCENT). CHANCE OF RAIN
SHOWERS IN THE EVENING AND OVERNIGHT.
MIN TEMPERATURE.....AROUND 52.
MAX HUMIDITY........100 PERCENT.
SURFACE WINDS (MPH).LIGHT WINDS.
CHANCE OF PCPN......30 PERCENT.
MIXING HEIGHT.......500 FT AGL.
MIXING WINDS........WEST 2 TO 3 MPH SHIFTING TO THE SOUTHEAST
AROUND 2 MPH LATE IN THE EVENING, THEN SHIFTING
TO THE EAST 1 TO 3 MPH LATE IN THE EVENING.
TIME (PST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........71 66 66 66 61 61 61 68 68 68 63 63
WEATHER COV.....CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW
TSTM COV........
TEMP............57 56 55 54 54 53 53 53 53 53 53 52
RH..............87 92 93 97 98 100 100 100 100 100 100 100
SURFACE WND DIR.W W W W W NW N N N N N N
SURFACE WND SPD.3 3 3 3 3 3 3 3 3 3 3 3
SURFACE WND GST.8 8 8 8 7 7 6 6 6 7 7 7
MIX HGT (KFT)...0.8 0.6 0.5 0.5 0.5 0.6 0.6 0.6 0.6 0.6 0.5 0.5
MIXING WIND DIR.W W W W SE E E E E E E E
MIXING WIND SPD.2 3 3 2 2 2 1 2 3 2 3 3
CHC OF PCPN (%).30 30 30 30 30 30 30 30 30 30 10 10
FRIDAY
SKY/WEATHER.........PARTLY CLOUDY (50-60 PERCENT). SLIGHT CHANCE OF
RAIN SHOWERS IN THE LATE MORNING AND EARLY
AFTERNOON.
MAX TEMPERATURE.....AROUND 65.
MIN HUMIDITY........75 PERCENT.
SURFACE WINDS (MPH).LIGHT WINDS BECOMING WEST 7 TO 9 MPH.
CHANCE OF PCPN......20 PERCENT.
MIXING HEIGHT.......2500 FT AGL.
MIXING WINDS........SOUTHEAST AROUND 3 MPH SHIFTING TO THE WEST 6
TO 7 MPH IN THE AFTERNOON.
TIME (PST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........63 52 52 52 43 43 43 46 46 46 53 53
WEATHER COV..... SCH SCH SCH SCH SCH SCH
WEATHER TYPE.... RW RW RW RW RW RW
TSTM COV........
TEMP............52 52 54 58 61 64 65 65 65 64 62 60
RH..............100 100 100 94 85 80 77 76 75 76 78 82
SURFACE WND DIR.N N NW W W W W W W W W W
SURFACE WND SPD.3 3 3 3 3 4 7 9 9 9 9 9
SURFACE WND GST.8 8 7 7 8 10 13 15 16 16 15 14
MIX HGT (KFT)...0.5 0.4 0.5 0.9 1.7 2.0 2.3 2.5 2.3 2.2 2.0 1.8
MIXING WIND DIR.E E SE S S S SW W W W W W
MIXING WIND SPD.3 3 3 3 3 5 6 6 7 7 7 7
CHC OF PCPN (%).10 10 10 10 20 20 20 20 20 20 10 10
FORECASTER...MIGUEL MILLER
REQUESTED BY...DAN BARRON
TYPE OF REQUEST...HAZMAT
.TAG 2600798.1/SGX
.DELDT 01/22/26
.FORMATTERVERSION 2.0.0
.EMAIL JSMITH@SAN-MARCOS.NET,JSMITH@SANMARCOSCA.GOV
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