– Lat/Long: 48.71° N 121.99° W
South Twin Sister
Weather Forecast, United StatesIssued: 9 am Fri 12 Dec Local TimeUpdates in: hr min sUpdate imminent
Issued: 9 am Fri 12 Dec Local Time
Updates in:
Update imminent hr min s
Issued: 9 am Fri 12 Dec 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 Sat night will be washed away by heavy rain (total 30mm) on Sun night. Mild temperatures (max 7°C on Sat afternoon, min 2°C on Sat night). Winds increasing (light winds from the SW on Fri night, near gales from the SSW by Sun night). | Days 4–6 Weather SummaryLight rain (total 9mm) on Mon morning. Becoming colder with heavy fall of snow, heaviest during Tue afternoon. Freeze-thaw conditions (max 5°C on Mon morning, min -6°C on Tue night). Mainly near gales. | |||||||||||||||||
Friday 12 | Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | Wednesday 17 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 | |  |  |  |  | | |  |  |  | | |  |  | | | | |
light rain | light rain | rain shwrs | clear | cloudy | light snow | light rain | light rain | heavy rain | mod. rain | mod. snow | light snow | cloudy | heavy snow | heavy snow | mod. snow | mod. snow | heavy snow | |
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
— | — | — | — | — | 5 | — | — | — | — | 10 | 5 | — | 11 | 17 | 8 | 8 | 12 | |
0.6 | 0.4 | 0.5 | — | — | 1.4 | 1.6 | 0.2 | 25 | 9 | — | — | — | — | — | — | — | — | |
max°C | 4 | 4 | 4 | 6 | 7 | 6 | 3 | 3 | 5 | 5 | 2 | -1 | 1 | 1 | -5 | -4 | -3 | -3 |
min°C | 3 | 3 | 3 | 5 | 7 | 2 | 3 | 3 | 3 | 5 | -2 | -3 | 0 | -2 | -6 | -4 | -4 | -4 |
-1 | 0 | 0 | 1 | 3 | -4 | -2 | -3 | -3 | -1 | -7 | -7 | -6 | -11 | -16 | -12 | -12 | -12 | |
2200 | 2150 | 2750 | 2700 | 2650 | 2050 | 2000 | 2050 | 2300 | 2550 | 1850 | 1250 | 1500 | 1700 | 700 | 850 | 950 | 900 | |
Cloud base (m) | 600 | 600 | 850 | 650 | 6150 | 1950 | 600 | 700 | 550 | 550 | 550 | 550 | 550 | 500 | 550 | 600 | 550 | 550 |
 | 7:50 | — | — | 7:52 | — | — | 7:52 | — | — | 7:54 | — | — | 7:54 | — | — | 7:54 | — | — |
 | — | 4:10 | — | — | 4:10 | — | — | 4:10 | — | — | 4:12 | — | — | 4:12 | — | — | 4:12 | — |
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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 Sat night will be washed away by heavy rain (total 30mm) on Sun night. Mild temperatures (max 7°C on Sat afternoon, min 2°C on Sat night). Winds increasing (light winds from the SW on Fri night, near gales from the SSW by Sun night).
South Twin Sister Weather (Days 3-6):
Light rain (total 9mm) on Mon morning. Becoming colder with heavy fall of snow, heaviest during Tue afternoon. Freeze-thaw conditions (max 5°C on Mon morning, min -6°C on Tue night). Mainly near gales.
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.