– Lat/Long: 48.71° N 121.99° W
South Twin Sister
Weather Forecast, United StatesIssued: 9 pm Sun 21 Dec Local TimeUpdates in: hr min sUpdate imminent
Issued: 9 pm Sun 21 Dec Local Time
Updates in:
Update imminent hr min s
Issued: 9 pm Sun 21 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 night. Freeze-thaw conditions (max 1°C on Tue night, min -6°C on Mon night). Winds increasing (light winds from the ESE on Tue night, near gales from the S by Wed afternoon). | Days 5–7 Weather SummaryA moderate fall of snow, heaviest on Thu night. Freeze-thaw conditions (max 1°C on Thu morning, min -6°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Monday 22 | Tuesday 23 | Wednesday 24 | Thursday 25 | Friday 26 | Saturday 27 | ||||||||||||||
night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  | |  |  |  | | | |  | | |  | | | | | |  | |
snow shwrs | light snow | light snow | light snow | some clouds | cloudy | light snow | light snow | light snow | some clouds | some clouds | light snow | heavy snow | light snow | some clouds | some clouds | some clouds | some clouds | cloudy | |
km/h | |||||||||||||||||||
 |  |  |  |  |  |  | |||||||||||||
19 | 2 | 4 | 5 | — | — | 1 | 4 | 4 | — | — | 3 | 13 | 2 | — | — | — | — | — | |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
max °C | -4 | -5 | -4 | -5 | -4 | -1 | 1 | 1 | -2 | 0 | 1 | -1 | -3 | -4 | -4 | -5 | -6 | -5 | 1 |
min °C | -5 | -5 | -4 | -6 | -5 | -3 | 0 | 0 | -4 | -3 | 0 | -2 | -4 | -4 | -4 | -6 | -6 | -6 | -4 |
-11 | -12 | -13 | -14 | -10 | -7 | -2 | -8 | -11 | -6 | -3 | -5 | -8 | -8 | -8 | -9 | -10 | -9 | -7 | |
700 | 750 | 750 | 650 | 650 | 950 | 1600 | 1850 | 1150 | 1000 | 1600 | 1250 | 950 | 850 | 850 | 0 | 500 | 650 | 0 | |
Cloud base (m) | 550 | 650 | 550 | 550 | 600 | 1800 | 1650 | 650 | 550 | 550 | 1950 | 750 | 550 | 550 | 550 | 600 | 650 | 600 | 650 |
 | — | 7:58 | — | — | 7:58 | — | — | 7:58 | — | — | 7:58 | — | — | 8:00 | — | — | 8:00 | — | — |
 | — | — | 4:14 | — | — | 4:15 | — | — | 4:15 | — | — | 4:15 | — | — | 4:16 | — | — | 4:17 | — |
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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 night. Freeze-thaw conditions (max 1°C on Tue night, min -6°C on Mon night). Winds increasing (light winds from the ESE on Tue night, near gales from the S by Wed afternoon).
South Twin Sister Weather (Days 3-6):
A moderate fall of snow, heaviest on Thu night. Freeze-thaw conditions (max 1°C on Thu morning, min -6°C on Fri night). Wind will be generally light.
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.