Air Resources Laboratory / Special Operations And Research Division (SORD)
Weather Advisories:
Nevada National Security Site Weather Forecast
Air Resources Laboratory/Special Operations and Research Division
1330 PST Tue Jul 21 2026
Official Sunrise Wednesday 442 PST
Official Sunset Wednesday 1859 PST
Forecaster: J Wood
.Forecast Summary...Monsoon moisture remains in place through Thursday. Mainly afternoon and evening thunderstorms will be observed. They will favor the higher terrain with the main threats being brief heavy rain and locally strong winds. Drier air will overspread our area by the end of the week ending the threat for thunderstorms. High temperatures will also be on the increase with the lower elevations observing afternoon highs in excess of 100 F through the weekend.
---For The Nevada National Security Site---
.Tonight...Partly cloudy with isolated showers and evening thunderstorms. Evening southwest winds 5 to 15 mph becoming light and variable overnight. Low temperatures 65 to 73 on the mesas, 70 to 75 on the dry lakes, 75 to 82 at the lower elevations, 81 at Mercury.
.Wednesday...Partly cloudy with isolated afternoon thunderstorms. Light and variable winds in the morning becoming southwest 10 to 25 mph in the afternoon. Higher gusts near thunderstorms. High temperatures 82 to 89 on the mesas, 95 to 103 at the lower elevations, 99 at Mercury.
.Wednesday Night...Partly cloudy. Evening southwest winds 5 to 15 mph becoming light and variable overnight. Low temperatures 63 to 70 on the mesas, 70 to 75 on the dry lakes, 72 to 79 at the lower elevations, 79 at Mercury.
.Thursday...Partly cloudy and hot. Slight chance of afternoon thunderstorms. Light and variable winds in the morning becoming southwest 10 to 25 mph in the afternoon. High temperatures 85 to 92 on the mesas, 100 to 108 at the lower elevations, 103 at Mercury.
.Friday...Partly cloudy and hot. Southwest winds 10 to 25 mph. Low temperatures 63 to 70 on the mesas, 70 to 75 on the dry lakes, 72 to 79 at the lower elevations, 78 at Mercury. High temperatures 85 to 93 on the mesas, 100 to 108 at the lower elevations, 103 at Mercury.
.Saturday...Mostly sunny and hot. Southwest winds 10 to 25 mph. Low temperatures 60 to 67 on the mesas, 65 to 70 on the dry lakes, 70 to 79 at the lower elevations, 79 at Mercury. High temperatures 84 to 91 on the mesas, 99 to 107 at the lower elevations, 104 at Mercury.
.Sunday...Mostly sunny and hot. Southwest winds 10 to 25 mph. Low temperatures 60 to 67 on the mesas, 65 to 70 on the dry lakes, 73 to 80 at the lower elevations, 80 at Mercury. High temperatures 85 to 93 on the mesas, 100 to 108 at the lower elevations, 103 at Mercury.
.Monday...Mostly sunny and hot. Southwest winds 15 to 30 mph. Low temperatures 60 to 67 on the mesas, 65 to 70 on the dry lakes, 71 to 79 at the lower elevations, 79 at Mercury. High temperatures 85 to 92 on the mesas, 99 to 107 at the lower elevations, 102 at Mercury.
-End Forecast---J Wood
Weather questions or reports should be directed to the Duty Forecaster at 5-1255.
Air Resources Laboratory/Special Operations and Research Division
1330 PST Tue Jul 21 2026
Official Sunrise Wednesday 442 PST
Official Sunset Wednesday 1859 PST
Forecaster: J Wood
.A Lightning Alert has been issued until 2000 PST..
NNSS Forecast Weather Threat Matrix
Wed 7/22
Thu 7/23
Fri 7/24
Sat 7/25
Sun 7/26
Mon 7/27
Thunderstorms.
Thunderstorms/Heat.
Heat.
Heat.
Heat.
Heat.
Threat/Impacts Legend
None/Low
Minor
Moderate
Major
.Forecast Summary...Monsoon moisture remains in place through Thursday. Mainly afternoon and evening thunderstorms will be observed. They will favor the higher terrain with the main threats being brief heavy rain and locally strong winds. Drier air will overspread our area by the end of the week ending the threat for thunderstorms. High temperatures will also be on the increase with the lower elevations observing afternoon highs in excess of 100 F through the weekend.
---For The Nevada National Security Site---
.Tonight...Partly cloudy with isolated showers and evening thunderstorms. Evening southwest winds 5 to 15 mph becoming light and variable overnight. Low temperatures 65 to 73 on the mesas, 70 to 75 on the dry lakes, 75 to 82 at the lower elevations, 81 at Mercury.
.Wednesday...Partly cloudy with isolated afternoon thunderstorms. Light and variable winds in the morning becoming southwest 10 to 25 mph in the afternoon. Higher gusts near thunderstorms. High temperatures 82 to 89 on the mesas, 95 to 103 at the lower elevations, 99 at Mercury.
.Wednesday Night...Partly cloudy. Evening southwest winds 5 to 15 mph becoming light and variable overnight. Low temperatures 63 to 70 on the mesas, 70 to 75 on the dry lakes, 72 to 79 at the lower elevations, 79 at Mercury.
.Thursday...Partly cloudy and hot. Slight chance of afternoon thunderstorms. Light and variable winds in the morning becoming southwest 10 to 25 mph in the afternoon. High temperatures 85 to 92 on the mesas, 100 to 108 at the lower elevations, 103 at Mercury.
.Friday...Partly cloudy and hot. Southwest winds 10 to 25 mph. Low temperatures 63 to 70 on the mesas, 70 to 75 on the dry lakes, 72 to 79 at the lower elevations, 78 at Mercury. High temperatures 85 to 93 on the mesas, 100 to 108 at the lower elevations, 103 at Mercury.
.Saturday...Mostly sunny and hot. Southwest winds 10 to 25 mph. Low temperatures 60 to 67 on the mesas, 65 to 70 on the dry lakes, 70 to 79 at the lower elevations, 79 at Mercury. High temperatures 84 to 91 on the mesas, 99 to 107 at the lower elevations, 104 at Mercury.
.Sunday...Mostly sunny and hot. Southwest winds 10 to 25 mph. Low temperatures 60 to 67 on the mesas, 65 to 70 on the dry lakes, 73 to 80 at the lower elevations, 80 at Mercury. High temperatures 85 to 93 on the mesas, 100 to 108 at the lower elevations, 103 at Mercury.
.Monday...Mostly sunny and hot. Southwest winds 15 to 30 mph. Low temperatures 60 to 67 on the mesas, 65 to 70 on the dry lakes, 71 to 79 at the lower elevations, 79 at Mercury. High temperatures 85 to 92 on the mesas, 99 to 107 at the lower elevations, 102 at Mercury.
-End Forecast---J Wood
Weather questions or reports should be directed to the Duty Forecaster at 5-1255.