– Lat/Long: 48.71° N 121.99° W
South Twin Sister
Weather Forecast, United StatesIssued: 9 pm Sun 14 Dec Local TimeUpdates in: hr min sUpdate imminent
Issued: 9 pm Sun 14 Dec Local Time
Updates in:
Update imminent hr min s
Issued: 9 pm Sun 14 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 Tue night. Freeze-thaw conditions (max 3°C on Sun night, min -10°C on Wed morning). Winds increasing (moderate winds from the SW on Mon night, stormy winds from the WSW by Tue night). | Days 5–7 Weather SummaryA heavy fall of snow, heaviest during Fri afternoon. Temperatures will be below freezing (max -2°C on Thu morning, min -11°C on Thu night). Mainly gales. | ||||||||||||||||||
Monday 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | ||||||||||||||
night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  |  | | |  | | | | | |  |  |  | | | | | |
light snow | light snow | mod. snow | mod. snow | mod. snow | light snow | heavy snow | mod. snow | mod. snow | light snow | light snow | light snow | snow shwrs | snow shwrs | heavy snow | heavy snow | mod. snow | mod. snow | mod. snow | |
km/h | |||||||||||||||||||
 |  |  |  |  |  |  | |||||||||||||
2 | 2 | 6 | 10 | 7 | 5 | 23 | 6 | 7 | 4 | 4 | 1 | 5 | 2 | 17 | 18 | 6 | 9 | 10 | |
25 | 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
max°C | 3 | 2 | -1 | -6 | -4 | -2 | -1 | -10 | -9 | -7 | -2 | -3 | -7 | -11 | -10 | -10 | -9 | -9 | -8 |
min°C | 2 | 1 | -6 | -7 | -5 | -3 | -9 | -10 | -9 | -9 | -6 | -5 | -11 | -11 | -10 | -11 | -10 | -9 | -8 |
-6 | -8 | -16 | -16 | -14 | -12 | -23 | -23 | -20 | -17 | -16 | -16 | -21 | -20 | -20 | -22 | -20 | -19 | -17 | |
2600 | 2600 | 1900 | 950 | 1150 | 1700 | 1250 | 750 | 800 | 900 | 950 | 1600 | 750 | 550 | 600 | 600 | 700 | 750 | 800 | |
Cloud base (m) | 550 | 550 | 550 | 600 | 600 | 550 | 500 | 600 | 600 | 650 | 500 | 500 | 550 | 550 | 550 | 550 | 550 | 550 | 550 |
 | — | 7:54 | — | — | 7:54 | — | — | 7:54 | — | — | 7:56 | — | — | 7:56 | — | — | 7:56 | — | — |
 | — | — | 4:12 | — | — | 4:12 | — | — | 4:12 | — | — | 4:12 | — | — | 4:13 | — | — | 4:13 | — |
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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 Tue night. Freeze-thaw conditions (max 3°C on Sun night, min -10°C on Wed morning). Winds increasing (moderate winds from the SW on Mon night, stormy winds from the WSW by Tue night).
South Twin Sister Weather (Days 3-6):
A heavy fall of snow, heaviest during Fri afternoon. Temperatures will be below freezing (max -2°C on Thu morning, min -11°C on Thu night). Mainly gales.
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.