– Lat/Long: 48.71° N 121.99° W
South Twin Sister Weather Forecast
Cascade Range · United StatesIssued: 3 pm Tue 03 Nov Local Time
Updates in:
Update imminent hr min s
Issued: 3 pm Tue 03 Nov 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 Wed night. Freeze-thaw conditions (max 2°C on Tue night, min -4°C on Thu morning). Winds increasing (light winds from the SW on Tue afternoon, fresh winds from the S by Wed afternoon). | Days 5–7 Weather SummaryLight rain (total 6mm) on Fri night. Becoming colder with heavy fall of snow, heaviest during Sat night. Freeze-thaw conditions (max 5°C on Sat morning, min -7°C on Sun morning). Winds decreasing (severe gales from the S on Sat afternoon, light winds from the WSW by Sun night). | ||||||||||||||||
Tue 3 | Wednesday 4 | Thursday 5 | Friday 6 | Saturday 7 | Sunday 8 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  |  |  |  | |  |  | |  | |  | | | | | |
some clouds | clear | clear | cloudy | heavy snow | snow shwrs | some clouds | cloudy | light snow | cloudy | mod. rain | cloudy | light rain | heavy snow | snow shwrs | some clouds | clear | |
Cloud base (m) | 2850 | 2100 | 9250 | 3350 | 600 | 700 | 1750 | 2400 | 950 | 600 | 1650 | 4100 | 6350 | 600 | 600 | 1650 | 1900 |
km/h | |||||||||||||||||
 |  |  |  |  |  | ||||||||||||
 cm | — | — | — | — | 11 | 1 | — | — | 1 | — | — | — | — | 33 | 3 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | 6 | — | 0.3 | — | — | — | — |
max °C | 1 | 2 | 2 | 1 | -2 | -3 | -1 | 0 | 1 | 2 | 4 | 5 | 4 | -4 | -6 | -5 | 1 |
min °C | 1 | 2 | 2 | -1 | -3 | -4 | -3 | -2 | -1 | 1 | 2 | 5 | 2 | -6 | -7 | -5 | -5 |
chill °C | -1 | -1 | -2 | -8 | -10 | -10 | -8 | -7 | -7 | -5 | -3 | 0 | -7 | -15 | -16 | -12 | -10 |
Freezing level m | 2350 | 2500 | 2600 | 2250 | 1700 | 1550 | 1700 | 2050 | 1950 | 2550 | 2700 | 3000 | 2700 | 1400 | 1200 | 1350 | 1600 |
 | — | — | 6:58 | — | — | 7:01 | — | — | 7:01 | — | — | 7:03 | — | — | 7:05 | — | — |
 | 4:44 | — | — | 4:42 | — | — | 4:40 | — | — | 4:38 | — | — | 4:37 | — | — | 4:36 | — |
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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 Wed night. Freeze-thaw conditions (max 2°C on Tue night, min -4°C on Thu morning). Winds increasing (light winds from the SW on Tue afternoon, fresh winds from the S by Wed afternoon).
South Twin Sister Weather (Days 3-6):
Light rain (total 6mm) on Fri night. Becoming colder with heavy fall of snow, heaviest during Sat night. Freeze-thaw conditions (max 5°C on Sat morning, min -7°C on Sun morning). Winds decreasing (severe gales from the S on Sat afternoon, light winds from the WSW by Sun night).
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.