Air Resources Laboratory / Special Operations And Research Division (SORD)
Weather Advisories:
NNSS Fire Weather Forecast
Air Resources Laboratory/Special Operations and Research Division
Valid: Friday May 22 2026 to Monday May 25 2026
Issued At: 0700 PST Fri May 22 2026
Forecaster: J Wood
.Forecast Summary...A weak disturbance will combine with mid level moisture to produce considerable cloud cover today. There's a slight chance of showers and thunderstorms through this evening. Very light precipitation is expected with this activity. If thunderstorms do develop, the main threats will be lightning and locally strong winds. This activity will also favor the mesas. High pressure will build over the weekend providing dry and seasonably warm temperatures. Looking ahead to next week, a late season system could bring gusty winds and cooler temperatures mid-week
Friday: May 22 2026
Weather: Mostly cloudy with a slight chance of afternoon showers and thunderstorms.
Wind: Variable winds to 10 mph in the morning becoming southwest 10 to 20 mph in the afternoon. Erratic, gusty winds near thunderstorms.
High Temperatures: 70 to 77 on the mesas, 83 to 90 at the lower elevations, 86 at Mercury.
Relative Humidity:
25% to 35% in the morning, 10% to 20% in the afternoon.
10% to 20% in the morning, 8% to 14% in the afternoon.
Mixing Height: 14,500 feet AGL.
Chance of Wetting Rains: 0%
Chance of Thunder: 10%
Dry Lightning Probability: 5%
Saturday: May 23 2026
Weather: Sunny with a few afternoon clouds over the higher terrain.
Wind: Variable winds to 10 mph in the morning becoming south 10 to 20 mph in the afternoon.
High Temperatures: 73 to 80 on the mesas, 86 to 93 at the lower elevations, 88 at Mercury.
Relative Humidity:
25% to 35% in the morning, 10% to 20% in the afternoon.
15% to 25% in the morning, 8% to 14% in the afternoon.
Mixing Height: 12,500 feet AGL.
Chance of Wetting Rains: 0%
Chance of Thunder: 0%
Dry Lightning Probability: 0%
Sunday: May 24 2026
Weather: Mostly sunny.
Wind: Variable winds to 10 mph in the morning becoming south 10 to 20 mph in the afternoon.
High Temperatures: 75 to 82 on the mesas, 87 to 94 at the lower elevations, 90 at Mercury.
Relative Humidity:
25% to 35% in the morning, 10% to 20% in the afternoon.
10% to 20% in the morning, 6% to 12% in the afternoon.
Mixing Height: 13,000 feet AGL.
Chance of Wetting Rains: 0%
Chance of Thunder: 0%
Dry Lightning Probability: 0%
Monday: May 25 2026
Weather: Mostly sunny.
Wind: Variable winds to 10 mph in the morning becoming south 15 to 30 mph in the afternoon.
High Temperatures: 70 to 78 on the mesas, 85 to 93 at the lower elevations, 89 at Mercury.
Relative Humidity:
20% to 30% in the morning, 10% to 20% in the afternoon.
10% to 20% in the morning, 6% to 12% in the afternoon.
Mixing Height: 12,500 feet AGL.
Chance of Wetting Rains: 0%
Chance of Thunder: 0%
Dry Lightning Probability: 0%
Weather questions or reports should be directed to the Duty Forecaster at 5-1255.
Air Resources Laboratory/Special Operations and Research Division
Valid: Friday May 22 2026 to Monday May 25 2026
Issued At: 0700 PST Fri May 22 2026
Forecaster: J Wood
.Forecast Summary...A weak disturbance will combine with mid level moisture to produce considerable cloud cover today. There's a slight chance of showers and thunderstorms through this evening. Very light precipitation is expected with this activity. If thunderstorms do develop, the main threats will be lightning and locally strong winds. This activity will also favor the mesas. High pressure will build over the weekend providing dry and seasonably warm temperatures. Looking ahead to next week, a late season system could bring gusty winds and cooler temperatures mid-week
Friday: May 22 2026
Weather: Mostly cloudy with a slight chance of afternoon showers and thunderstorms.
Wind: Variable winds to 10 mph in the morning becoming southwest 10 to 20 mph in the afternoon. Erratic, gusty winds near thunderstorms.
High Temperatures: 70 to 77 on the mesas, 83 to 90 at the lower elevations, 86 at Mercury.
Relative Humidity:
25% to 35% in the morning, 10% to 20% in the afternoon.
10% to 20% in the morning, 8% to 14% in the afternoon.
Mixing Height: 14,500 feet AGL.
Chance of Wetting Rains: 0%
Chance of Thunder: 10%
Dry Lightning Probability: 5%
Saturday: May 23 2026
Weather: Sunny with a few afternoon clouds over the higher terrain.
Wind: Variable winds to 10 mph in the morning becoming south 10 to 20 mph in the afternoon.
High Temperatures: 73 to 80 on the mesas, 86 to 93 at the lower elevations, 88 at Mercury.
Relative Humidity:
25% to 35% in the morning, 10% to 20% in the afternoon.
15% to 25% in the morning, 8% to 14% in the afternoon.
Mixing Height: 12,500 feet AGL.
Chance of Wetting Rains: 0%
Chance of Thunder: 0%
Dry Lightning Probability: 0%
Sunday: May 24 2026
Weather: Mostly sunny.
Wind: Variable winds to 10 mph in the morning becoming south 10 to 20 mph in the afternoon.
High Temperatures: 75 to 82 on the mesas, 87 to 94 at the lower elevations, 90 at Mercury.
Relative Humidity:
25% to 35% in the morning, 10% to 20% in the afternoon.
10% to 20% in the morning, 6% to 12% in the afternoon.
Mixing Height: 13,000 feet AGL.
Chance of Wetting Rains: 0%
Chance of Thunder: 0%
Dry Lightning Probability: 0%
Monday: May 25 2026
Weather: Mostly sunny.
Wind: Variable winds to 10 mph in the morning becoming south 15 to 30 mph in the afternoon.
High Temperatures: 70 to 78 on the mesas, 85 to 93 at the lower elevations, 89 at Mercury.
Relative Humidity:
20% to 30% in the morning, 10% to 20% in the afternoon.
10% to 20% in the morning, 6% to 12% in the afternoon.
Mixing Height: 12,500 feet AGL.
Chance of Wetting Rains: 0%
Chance of Thunder: 0%
Dry Lightning Probability: 0%
Weather questions or reports should be directed to the Duty Forecaster at 5-1255.