– Lat/Long: 48.71° N 121.99° W
South Twin Sister Weather Forecast
Cascade Range · United StatesIssued: 3 pm Fri 06 Nov Local Time
Updates in:
Update imminent hr min s
Issued: 3 pm Fri 06 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 Sun morning. Freeze-thaw conditions (max 4°C on Sat morning, min -5°C on Sat night). Winds decreasing (extremely windy from the SSW on Sat night, calm by Sun night). | Days 5–7 Weather SummaryA light covering of new snow mostly falling on Tue morning will be washed away by heavy rain (total 27mm) on Tue afternoon. Freeze-thaw conditions (max 8°C on Wed afternoon, min -3°C on Mon afternoon). Winds increasing (moderate winds from the SW on Mon night, strong winds from the SSW by Tue night). | ||||||||||||||||
Fri 6 | Saturday 7 | Sunday 8 | Monday 9 | Tuesday 10 | Wednesday 11 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  | |  |  |  |  |  |  |  |  |  |  |  | |  | |
mod. snow | snow shwrs | light rain | light rain | heavy snow | heavy snow | snow shwrs | clear | some clouds | cloudy | light snow | light snow | heavy rain | rain shwrs | clear | some clouds | some clouds | |
Cloud base (m) | 600 | 600 | 2650 | 2000 | 550 | 650 | 600 | 850 | 2400 | 700 | 600 | 600 | 950 | 4850 | 6400 | 6650 | |
km/h | |||||||||||||||||
 |  |  |  |  |  | ||||||||||||
 cm | 6 | 3 | — | — | 13 | 11 | 1 | — | — | — | 3 | 5 | — | — | — | — | — |
mm | — | — | 0.1 | 0.7 | — | — | — | — | — | — | — | 6 | 15 | 5 | — | — | — |
max °C | 1 | 3 | 4 | 4 | 1 | -4 | -4 | -1 | -2 | -2 | 1 | 2 | 3 | 6 | 7 | 8 | 8 |
min °C | 1 | -1 | 4 | 3 | -5 | -5 | -5 | -4 | -2 | -3 | -2 | 2 | 2 | 4 | 7 | 7 | 8 |
chill °C | -6 | -6 | -1 | -6 | -16 | -14 | -13 | -9 | -8 | -10 | -8 | -5 | -4 | -2 | 2 | 3 | 4 |
Freezing level m | 2400 | 2250 | 2750 | 2700 | 1650 | 1500 | 1400 | 1450 | 1700 | 1650 | 2100 | 2500 | 2650 | 2950 | 3250 | 3350 | 3300 |
 | — | — | 7:03 | — | — | 7:05 | — | — | 7:07 | — | — | 7:07 | — | — | 7:09 | — | — |
 | 4:38 | — | — | 4:37 | — | — | 4:36 | — | — | 4:35 | — | — | 4:34 | — | — | 4:31 | — |
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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 Sun morning. Freeze-thaw conditions (max 4°C on Sat morning, min -5°C on Sat night). Winds decreasing (extremely windy from the SSW on Sat night, calm by Sun night).
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 27mm) on Tue afternoon. Freeze-thaw conditions (max 8°C on Wed afternoon, min -3°C on Mon afternoon). Winds increasing (moderate winds from the SW on Mon night, strong winds from the SSW by Tue 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.