– Lat/Long: 48.71° N 121.99° W
South Twin Sister
Weather Forecast, United StatesIssued: 3 pm Fri 19 Dec Local TimeUpdates in: hr min sUpdate imminent
Issued: 3 pm Fri 19 Dec Local Time
Updates in:
Update imminent hr min s
Issued: 3 pm Fri 19 Dec Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–4 Weather SummaryA heavy fall of snow, heaviest during Sun afternoon. Temperatures will be below freezing (max -3°C on Sat afternoon, min -6°C on Fri afternoon). Mainly fresh winds. | Days 5–7 Weather SummaryA moderate fall of snow, heaviest on Mon afternoon. Freeze-thaw conditions (max 3°C on Thu morning, min -5°C on Mon night). Winds decreasing (strong winds from the S on Mon afternoon, calm by Wed night). | ||||||||||||||||
Fri 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  | |  | | | | |  | |  | |  |  | | |  | |
light snow | heavy snow | light snow | heavy snow | heavy snow | light snow | heavy snow | heavy snow | mod. snow | mod. snow | mod. snow | light snow | cloudy | cloudy | light snow | cloudy | some clouds | |
km/h | |||||||||||||||||
 |  |  |  |  |  | ||||||||||||
5 | 14 | 4 | 11 | 13 | 4 | 15 | 14 | 7 | 6 | 7 | 3 | — | — | 1 | — | — | |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
max°C | -6 | -5 | -4 | -3 | -3 | -3 | -3 | -4 | -4 | -4 | -5 | -4 | -3 | -2 | -2 | 0 | -1 |
min°C | -6 | -6 | -5 | -4 | -3 | -3 | -4 | -5 | -5 | -4 | -5 | -5 | -4 | -4 | -3 | -1 | -1 |
-14 | -13 | -13 | -11 | -10 | -11 | -12 | -13 | -14 | -13 | -13 | -13 | -10 | -7 | -6 | -3 | -1 | |
650 | 600 | 750 | 850 | 950 | 900 | 950 | 800 | 750 | 900 | 700 | 750 | 850 | 900 | 900 | 1400 | 1100 | |
Cloud base (m) | 550 | 550 | 550 | 550 | 550 | 550 | 550 | 550 | 550 | 550 | 550 | 550 | 550 | 700 | 700 | 500 | 550 |
 | — | — | 7:56 | — | — | 7:58 | — | — | 7:58 | — | — | 7:58 | — | — | 7:58 | — | — |
 | 4:13 | — | — | 4:13 | — | — | 4:14 | — | — | 4:14 | — | — | 4:15 | — | — | 4:15 | — |
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South Twin Sister Weather (Days 0-3):
The weather forecast for South Twin Sister is: A heavy fall of snow, heaviest during Sun afternoon. Temperatures will be below freezing (max -3°C on Sat afternoon, min -6°C on Fri afternoon). Mainly fresh winds.
South Twin Sister Weather (Days 3-6):
A moderate fall of snow, heaviest on Mon afternoon. Freeze-thaw conditions (max 3°C on Thu morning, min -5°C on Mon night). Winds decreasing (strong winds from the S on Mon afternoon, calm by Wed night).
This table gives the weather forecast for South Twin Sister at the specific elevation of 1500 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.