– Lat/Long: 48.71° N 121.99° W
South Twin Sister
Weather Forecast, United StatesIssued: 3 pm Sat 13 Dec Local TimeUpdates in: hr min sUpdate imminent
Issued: 3 pm Sat 13 Dec Local Time
Updates in:
Update imminent hr min s
Issued: 3 pm Sat 13 Dec Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–4 Weather SummaryHeavy rain (total 34mm) on Sun night. Becoming colder with heavy fall of snow, heaviest during Mon afternoon. Freeze-thaw conditions (max 4°C on Sat afternoon, min -8°C on Mon night). Winds decreasing (severe gales from the SSW on Mon morning, moderate winds from the WSW by Mon night). | Days 5–7 Weather SummaryA heavy fall of snow, heaviest during Thu night. Temperatures will be below freezing (max -2°C on Tue afternoon, min -11°C on Thu night). Winds decreasing (stormy winds from the W on Tue night, moderate winds from the W by Thu night). | ||||||||||||||||
Sat 13 | Sunday 14 | Monday 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  | |  |  | |  | |  | |  | | | | | |  | |
cloudy | light snow | cloudy | light snow | mod. snow | light snow | heavy snow | mod. snow | mod. snow | light snow | heavy snow | mod. snow | heavy snow | heavy snow | light snow | mod. snow | snow shwrs | |
km/h | |||||||||||||||||
 |  |  |  |  |  | ||||||||||||
— | 1 | — | 1 | 6 | 2 | 13 | 7 | 6 | 4 | 20 | 9 | 12 | 11 | 5 | 6 | 22 | |
— | — | — | — | 20 | 14 | — | — | — | — | — | — | — | — | — | — | — | |
max°C | 4 | 3 | -1 | 0 | 2 | 2 | 1 | -6 | -5 | -2 | -2 | -10 | -9 | -6 | -6 | -5 | -8 |
min°C | 4 | -2 | -1 | 0 | 1 | 2 | -4 | -8 | -5 | -4 | -10 | -10 | -9 | -8 | -6 | -6 | -11 |
-2 | -10 | -9 | -7 | -7 | -6 | -14 | -17 | -14 | -13 | -24 | -22 | -20 | -18 | -17 | -15 | -22 | |
2800 | 2200 | 1950 | 2100 | 2500 | 2550 | 2300 | 950 | 1100 | 1550 | 1650 | 750 | 800 | 950 | 1050 | 950 | 600 | |
Cloud base (m) | 6500 | 2450 | 650 | 750 | 550 | 550 | 500 | 650 | 600 | 500 | 450 | 600 | 550 | 550 | 500 | 500 | 500 |
 | — | — | 7:52 | — | — | 7:54 | — | — | 7:54 | — | — | 7:54 | — | — | 7:56 | — | — |
 | 4:10 | — | — | 4:10 | — | — | 4:12 | — | — | 4:12 | — | — | 4:12 | — | — | 4:12 | — |
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South Twin Sister Weather (Days 0-3):
The weather forecast for South Twin Sister is: Heavy rain (total 34mm) on Sun night. Becoming colder with heavy fall of snow, heaviest during Mon afternoon. Freeze-thaw conditions (max 4°C on Sat afternoon, min -8°C on Mon night). Winds decreasing (severe gales from the SSW on Mon morning, moderate winds from the WSW by Mon night).
South Twin Sister Weather (Days 3-6):
A heavy fall of snow, heaviest during Thu night. Temperatures will be below freezing (max -2°C on Tue afternoon, min -11°C on Thu night). Winds decreasing (stormy winds from the W on Tue night, moderate winds from the W by Thu night).
This table gives the weather forecast for South Twin Sister at the specific elevation of 2134 m. Our advanced weather models allow us to provide distinct weather forecasts for several elevations of South Twin Sister. To see the weather forecasts for the other elevations, use the tab navigation above the table. For a wider overview of the weather, consult the Weather Map of Washington.