– Lat/Long: 48.71° N 121.99° W
South Twin Sister
Weather Forecast, United StatesIssued: 9 am Fri 20 Feb Local TimeUpdates in: hr min sUpdate imminent
Issued: 9 am Fri 20 Feb Local Time
Updates in:
Update imminent hr min s
Issued: 9 am Fri 20 Feb Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–3 Weather SummaryA light covering of new snow mostly falling on Sun afternoon. Freeze-thaw conditions (max 2°C on Sat night, min -8°C on Fri morning). Winds increasing (light winds from the S on Fri afternoon, fresh winds from the S by Sun night). | Days 4–6 Weather SummaryA heavy fall of snow, heaviest during Tue morning. Temperatures will be below freezing (max 0°C on Mon night, min -5°C on Tue morning). Winds increasing (calm on Mon afternoon, strong winds from the S by Wed night). | |||||||||||||||||
Friday 20 | Saturday 21 | Sunday 22 | Monday 23 | Tuesday 24 | Wednesday 25 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 | |  | |  | | | |  | | | |  |  |  | | |  | |
cloudy | cloudy | cloudy | cloudy | light snow | cloudy | cloudy | light snow | light snow | cloudy | cloudy | light snow | mod. snow | snow shwrs | mod. snow | light snow | light snow | heavy snow | |
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
— | — | — | — | 1 | — | — | 4 | 1 | — | — | 4 | 8 | 2 | 10 | 3 | 1 | 11 | |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
max °C | -7 | -6 | -2 | -1 | 0 | 2 | 0 | -1 | -2 | -1 | -1 | 0 | -4 | -5 | -5 | -5 | -3 | -3 |
min °C | -8 | -6 | -5 | -2 | -2 | 0 | 0 | -1 | -2 | -1 | -2 | -3 | -5 | -5 | -5 | -5 | -4 | -3 |
-12 | -9 | -9 | -6 | -7 | -5 | -5 | -8 | -10 | -4 | -2 | -8 | -11 | -10 | -11 | -11 | -11 | -11 | |
400 | 800 | 650 | 1300 | 1100 | 1650 | 1550 | 1300 | 1100 | 1300 | 1200 | 1300 | 850 | 850 | 700 | 750 | 950 | 950 | |
Cloud base (m) | 700 | 1950 | 1650 | 2850 | 2150 | 2100 | 1550 | 700 | 600 | 850 | 2000 | 550 | 600 | 550 | 550 | 600 | 600 | 600 |
 | 7:05 | — | — | 7:03 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:56 | — | — |
 | — | 5:37 | — | — | 5:38 | — | — | 5:39 | — | — | 5:42 | — | — | 5:43 | — | — | 5:45 | — |
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South Twin Sister Weather (Days 0-3):
The weather forecast for South Twin Sister is: A light covering of new snow mostly falling on Sun afternoon. Freeze-thaw conditions (max 2°C on Sat night, min -8°C on Fri morning). Winds increasing (light winds from the S on Fri afternoon, fresh winds from the S by Sun night).
South Twin Sister Weather (Days 3-6):
A heavy fall of snow, heaviest during Tue morning. Temperatures will be below freezing (max 0°C on Mon night, min -5°C on Tue morning). Winds increasing (calm on Mon afternoon, strong winds from the S 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.