– Lat/Long: 48.71° N 121.99° W
South Twin Sister
Weather Forecast, United StatesIssued: 9 am Sat 20 Dec Local TimeUpdates in: hr min sUpdate imminent
Issued: 9 am Sat 20 Dec Local Time
Updates in:
Update imminent hr min s
Issued: 9 am Sat 20 Dec Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–3 Weather SummaryA heavy fall of snow, heaviest during Sun night. Temperatures will be well below freezing (max -6°C on Sun morning, min -10°C on Sun night). Mainly gales. | Days 4–6 Weather SummaryA moderate fall of snow, heaviest on Thu night. Temperatures will be below freezing (max -1°C on Wed night, min -9°C on Tue morning). Winds decreasing (fresh winds from the SSW on Tue morning, calm by Wed afternoon). | |||||||||||||||||
Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | Thursday 25 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  |  | | | | |  | |  |  | | |  |  | |  | |
mod. snow | heavy snow | heavy snow | light snow | light snow | heavy snow | mod. snow | mod. snow | light snow | light snow | some clouds | cloudy | some clouds | some clouds | some clouds | cloudy | light snow | mod. snow | |
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
6 | 22 | 20 | 2 | 5 | 48 | 9 | 8 | 3 | 3 | — | — | — | — | — | — | 1 | 6 | |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
max °C | -8 | -7 | -7 | -6 | -6 | -8 | -8 | -7 | -9 | -9 | -8 | -6 | -6 | -5 | -1 | -1 | -2 | -3 |
min °C | -9 | -7 | -7 | -6 | -6 | -10 | -9 | -9 | -10 | -9 | -8 | -7 | -6 | -5 | -4 | -2 | -3 | -5 |
-20 | -16 | -15 | -15 | -16 | -19 | -20 | -21 | -21 | -19 | -16 | -14 | -10 | -5 | -7 | -9 | -9 | -12 | |
850 | 950 | 950 | 1050 | 1050 | 700 | 700 | 900 | 650 | 800 | 750 | 1050 | 1000 | 1100 | 1650 | 2000 | 1800 | 1400 | |
Cloud base (m) | 550 | 550 | 550 | 550 | 500 | 550 | 650 | 550 | 700 | 600 | 550 | 1600 | 1900 | 650 | 550 | 550 | 1800 | 1500 |
 | 7:56 | — | — | 7:58 | — | — | 7:58 | — | — | 7:58 | — | — | 7:58 | — | — | 7:58 | — | — |
 | — | 4:13 | — | — | 4:14 | — | — | 4:14 | — | — | 4:15 | — | — | 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 night. Temperatures will be well below freezing (max -6°C on Sun morning, min -10°C on Sun night). Mainly gales.
South Twin Sister Weather (Days 3-6):
A moderate fall of snow, heaviest on Thu night. Temperatures will be below freezing (max -1°C on Wed night, min -9°C on Tue morning). Winds decreasing (fresh winds from the SSW on Tue morning, calm by Wed afternoon).
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.