– Lat/Long: 48.71° N 121.99° W
South Twin Sister Weather Forecast
Cascade Range · United StatesIssued: 3 pm Sun 08 Nov Local Time
Updates in:
Update imminent hr min s
Issued: 3 pm Sun 08 Nov Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–4 Weather SummaryA heavy fall of snow, heaviest during Tue afternoon. Becoming milder with moderate rain (total 17mm) on Tue night. Freeze-thaw conditions (max 5°C on Wed morning, min -3°C on Sun afternoon). Winds increasing (light winds from the SW on Sun night, near gales from the SSW by Tue night). | Days 5–7 Weather SummaryA heavy fall of snow, heaviest during Fri night. Freeze-thaw conditions (max 6°C on Wed afternoon, min -2°C on Fri night). Winds decreasing (severe gales from the SSW on Fri morning, fresh winds from the SSW by Fri night). | ||||||||||||||||
Sun 8 | Monday 9 | Tuesday 10 | Wednesday 11 | Thursday 12 | Friday 13 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  |  |  | |  |  |  | | | |  |  | | |  | |
snow shwrs | cloudy | cloudy | light snow | light snow | light snow | mod. snow | heavy rain | light rain | cloudy | cloudy | cloudy | some clouds | some clouds | cloudy | cloudy | heavy snow | |
Cloud base (m) | 800 | 6100 | 1950 | 1700 | 700 | 800 | 600 | 600 | 1600 | 1850 | 5850 | 6400 | 6000 | 1700 | 550 | ||
km/h | |||||||||||||||||
 |  |  |  |  |  | ||||||||||||
 cm | 1 | — | — | 3 | 5 | 4 | 7 | — | — | — | — | — | — | — | — | — | 17 |
mm | — | — | — | — | — | — | — | 17 | 0.4 | — | — | — | — | — | — | — | — |
max °C | -3 | -1 | -1 | -1 | -1 | 0 | 2 | 4 | 5 | 6 | 6 | 4 | 3 | 3 | 1 | 1 | 0 |
min °C | -3 | -2 | -2 | -1 | -2 | -1 | 2 | 3 | 4 | 5 | 4 | 3 | 2 | 2 | 1 | 1 | -2 |
chill °C | -9 | -5 | -8 | -8 | -9 | -8 | -3 | -3 | -3 | -1 | -2 | -3 | -5 | -6 | -8 | -8 | -10 |
Freezing level m | 1700 | 1800 | 1850 | 1900 | 1700 | 1700 | 2600 | 2900 | 3000 | 2950 | 2900 | 2700 | 2650 | 2600 | 2350 | 2200 | 1950 |
 | — | — | 7:07 | — | — | 7:07 | — | — | 7:09 | — | — | 7:11 | — | — | 7:13 | — | — |
 | 4:36 | — | — | 4:35 | — | — | 4:34 | — | — | 4:31 | — | — | 4:30 | — | — | 4:30 | — |
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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 Tue afternoon. Becoming milder with moderate rain (total 17mm) on Tue night. Freeze-thaw conditions (max 5°C on Wed morning, min -3°C on Sun afternoon). Winds increasing (light winds from the SW on Sun night, near gales from the SSW by Tue night).
South Twin Sister Weather (Days 3-6):
A heavy fall of snow, heaviest during Fri night. Freeze-thaw conditions (max 6°C on Wed afternoon, min -2°C on Fri night). Winds decreasing (severe gales from the SSW on Fri morning, fresh winds from the SSW by Fri 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.