– Lat/Long: 48.71° N 121.99° W
South Twin Sister
Weather Forecast, United StatesIssued: 4 pm Fri 13 Mar Local TimeUpdates in: hr min sUpdate imminent
Issued: 4 pm Fri 13 Mar Local Time
Updates in:
Update imminent hr min s
Issued: 4 pm Fri 13 Mar Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–4 Weather SummaryA moderate fall of snow, heaviest on Sat morning. Freeze-thaw conditions (max 2°C on Mon morning, min -9°C on Sat morning). Winds increasing (calm on Sat night, fresh winds from the S by Mon morning). | Days 5–7 Weather SummaryA light covering of new snow mostly falling on Tue morning will be washed away by heavy rain (total 46mm) on Wed afternoon. Mild temperatures (max 6°C on Thu morning, min 1°C on Tue morning). Winds increasing (light winds from the S on Tue night, fresh winds from the SSE by Wed afternoon). | ||||||||||||||||
Fri 13 | Saturday 14 | Sunday 15 | Monday 16 | Tuesday 17 | Wednesday 18 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  | |  |  | |  | |  |  | |  |  | |  |  | |
light snow | snow shwrs | snow shwrs | snow shwrs | some clouds | cloudy | cloudy | mod. snow | light snow | mod. rain | light snow | light snow | light rain | light rain | light rain | heavy rain | heavy rain | |
km/h | |||||||||||||||||
 |  |  |  |  |  | ||||||||||||
1 | 1 | 3 | 1 | — | — | — | 7 | 1 | — | 1 | 4 | — | — | — | — | — | |
— | — | — | — | — | — | — | — | — | 6 | 2 | 3 | 0.3 | 0.7 | 4 | 11 | 14 | |
max °C | -6 | -6 | -9 | -8 | -7 | -4 | -3 | 0 | 2 | 4 | 4 | 2 | 4 | 4 | 5 | 3 | 5 |
min °C | -6 | -8 | -9 | -9 | -7 | -6 | -4 | -3 | 1 | 2 | 2 | 1 | 4 | 4 | 4 | 3 | 2 |
-9 | -14 | -16 | -16 | -11 | -6 | -9 | -10 | -6 | -4 | -4 | -6 | -2 | 0 | 0 | -3 | -4 | |
650 | 0 | 400 | 450 | 0 | 750 | 850 | 1550 | 3050 | 2300 | 2700 | 2100 | 2150 | 2250 | 2550 | 2300 | 2600 | |
Cloud base (m) | 550 | 600 | 700 | 700 | 650 | 1900 | 2050 | 600 | 750 | 600 | 600 | 600 | 600 | 650 | 600 | 550 | 600 |
 | — | — | 7:22 | — | — | 7:20 | — | — | 7:18 | — | — | 7:16 | — | — | 7:15 | — | — |
 | 7:08 | — | — | 7:10 | — | — | 7:12 | — | — | 7:14 | — | — | 7:15 | — | — | 7:16 | — |
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South Twin Sister Weather (Days 0-3):
The weather forecast for South Twin Sister is: A moderate fall of snow, heaviest on Sat morning. Freeze-thaw conditions (max 2°C on Mon morning, min -9°C on Sat morning). Winds increasing (calm on Sat night, fresh winds from the S by Mon morning).
South Twin Sister Weather (Days 3-6):
A light covering of new snow mostly falling on Tue morning will be washed away by heavy rain (total 46mm) on Wed afternoon. Mild temperatures (max 6°C on Thu morning, min 1°C on Tue morning). Winds increasing (light winds from the S on Tue night, fresh winds from the SSE by Wed afternoon).
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.