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
1430 PST Mon Oct 19 2026
Official Sunrise Tuesday 557 PST
Official Sunset Tuesday 1701 PST
Forecaster: J Wood
.Forecast Summary...A region of low-pressure in the Pacific Northwest will migrate south allowing southerly upper-level flow over Nevada beginning by Tuesday afternoon. Moisture and stronger surface winds will follow creating an environment favorable for showers and thunderstorm development across the site. Wednesday and Thursday have a persistent risk for lightning particularly around the high terrain features in the mesas. The region will begin drying out on Friday, allowing for clear skies and stable conditions for the weekend.
---For The Nevada National Security Site---
.Tonight...Mostly Clear. Southerly winds 5 to 15 mph becoming light and variable overnight. Low temperatures 25 to 33 on the mesas, 36 to 44 on the dry lakes, 49 to 57 at the lower elevations, 55 at Mercury.
.Tuesday...Partly Cloudy with a slight chance for rain in the evening. South southeasterly winds 5 to 15 mph gusting to 30 mph. High temperatures 48 to 56 on the mesas, 72 to 80 at the lower elevations, 74 at Mercury.
.Tuesday Night...Partly Cloudy with a slight chance for thunderstorms. South southeasterly winds 5 to 15 mph becoming light and variable overnight. Low temperatures 26 to 34 on the mesas, 37 to 45 on the dry lakes, 51 to 59 at the lower elevations, 57 at Mercury.
.Wednesday...Mostly Cloudy with likely showers and a chance for thunderstorms. Southerly winds 10 to 20 mph gusting to 32 mph. Low temperatures 28 to 36 on the mesas, 40 to 48 on the dry lakes, 52 to 60 at the lower elevations, 58 at Mercury. High temperatures 44 to 52 on the mesas, 66 to 74 at the lower elevations, 71 at Mercury.
.Thursday...Mostly Cloudy with likely showers and a chance for thunderstorms. South Southwesterly winds 5 to 15 mph gusting to 25 mph. Low temperatures 21 to 29 on the mesas, 35 to 43 on the dry lakes, 48 to 56 at the lower elevations, 53 at Mercury. High temperatures 37 to 45 on the mesas, 59 to 67 at the lower elevations, 61 at Mercury.
.Friday...Partly Cloudy. East northeasterly winds 5 to 15 mph gusting to 25 mph. Low temperatures 19 to 27 on the mesas, 33 to 41 on the dry lakes, 45 to 53 at the lower elevations, 51 at Mercury. High temperatures 38 to 46 on the mesas, 62 to 70 at the lower elevations, 64 at Mercury.
.Saturday...Sunny. Northerly winds 5 to 20 mph. Low temperatures 17 to 25 on the mesas, 30 to 38 on the dry lakes, 43 to 51 at the lower elevations, 49 at Mercury. High temperatures 37 to 45 on the mesas, 61 to 69 at the lower elevations, 63 at Mercury.
.Sunday...Sunny. Northerly winds 5 to 20 mph. Low temperatures 18 to 26 on the mesas, 30 to 38 on the dry lakes, 44 to 52 at the lower elevations, 49 at Mercury. High temperatures 39 to 47 on the mesas, 62 to 70 at the lower elevations, 64 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
1430 PST Mon Oct 19 2026
Official Sunrise Tuesday 557 PST
Official Sunset Tuesday 1701 PST
Forecaster: J Wood
NNSS Forecast Weather Threat Matrix
Tue 10/20
Wed 10/21
Thu 10/22
Fri 10/23
Sat 10/24
Sun 10/25
Thunderstorms
Wind/Rain/Thunderstorms
Rain/Thunderstorms
None
None
None
Threat/Impacts Legend
None/Low
Minor
Moderate
Major
.Forecast Summary...A region of low-pressure in the Pacific Northwest will migrate south allowing southerly upper-level flow over Nevada beginning by Tuesday afternoon. Moisture and stronger surface winds will follow creating an environment favorable for showers and thunderstorm development across the site. Wednesday and Thursday have a persistent risk for lightning particularly around the high terrain features in the mesas. The region will begin drying out on Friday, allowing for clear skies and stable conditions for the weekend.
---For The Nevada National Security Site---
.Tonight...Mostly Clear. Southerly winds 5 to 15 mph becoming light and variable overnight. Low temperatures 25 to 33 on the mesas, 36 to 44 on the dry lakes, 49 to 57 at the lower elevations, 55 at Mercury.
.Tuesday...Partly Cloudy with a slight chance for rain in the evening. South southeasterly winds 5 to 15 mph gusting to 30 mph. High temperatures 48 to 56 on the mesas, 72 to 80 at the lower elevations, 74 at Mercury.
.Tuesday Night...Partly Cloudy with a slight chance for thunderstorms. South southeasterly winds 5 to 15 mph becoming light and variable overnight. Low temperatures 26 to 34 on the mesas, 37 to 45 on the dry lakes, 51 to 59 at the lower elevations, 57 at Mercury.
.Wednesday...Mostly Cloudy with likely showers and a chance for thunderstorms. Southerly winds 10 to 20 mph gusting to 32 mph. Low temperatures 28 to 36 on the mesas, 40 to 48 on the dry lakes, 52 to 60 at the lower elevations, 58 at Mercury. High temperatures 44 to 52 on the mesas, 66 to 74 at the lower elevations, 71 at Mercury.
.Thursday...Mostly Cloudy with likely showers and a chance for thunderstorms. South Southwesterly winds 5 to 15 mph gusting to 25 mph. Low temperatures 21 to 29 on the mesas, 35 to 43 on the dry lakes, 48 to 56 at the lower elevations, 53 at Mercury. High temperatures 37 to 45 on the mesas, 59 to 67 at the lower elevations, 61 at Mercury.
.Friday...Partly Cloudy. East northeasterly winds 5 to 15 mph gusting to 25 mph. Low temperatures 19 to 27 on the mesas, 33 to 41 on the dry lakes, 45 to 53 at the lower elevations, 51 at Mercury. High temperatures 38 to 46 on the mesas, 62 to 70 at the lower elevations, 64 at Mercury.
.Saturday...Sunny. Northerly winds 5 to 20 mph. Low temperatures 17 to 25 on the mesas, 30 to 38 on the dry lakes, 43 to 51 at the lower elevations, 49 at Mercury. High temperatures 37 to 45 on the mesas, 61 to 69 at the lower elevations, 63 at Mercury.
.Sunday...Sunny. Northerly winds 5 to 20 mph. Low temperatures 18 to 26 on the mesas, 30 to 38 on the dry lakes, 44 to 52 at the lower elevations, 49 at Mercury. High temperatures 39 to 47 on the mesas, 62 to 70 at the lower elevations, 64 at Mercury.
-End Forecast---J Wood
Weather questions or reports should be directed to the Duty Forecaster at 5-1255.