– Lat/Long: 48.71° N 121.99° W
South Twin Sister Weather Forecast
Cascade Range · United StatesIssued: 10 am Fri 23 Oct Local Time
Updates in:
Update imminent hr min s
Issued: 10 am Fri 23 Oct Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–3 Weather SummaryA dusting of new snow. Freeze-thaw conditions (max 3°C on Sun night, min -2°C on Fri morning). Wind will be generally light. | Days 4–6 Weather SummaryA heavy fall of snow, heaviest during Wed night. Freeze-thaw conditions (max 4°C on Mon morning, min -6°C on Tue night). Winds decreasing (fresh winds from the S on Tue night, calm by Wed night). | |||||||||||||||||
Friday 23 | Saturday 24 | Sunday 25 | Monday 26 | Tuesday 27 | Wednesday 28 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 | |  |  | |  | | |  | |  | | |  | |  | |  | |
clear | clear | some clouds | cloudy | cloudy | light snow | cloudy | cloudy | clear | clear | some clouds | some clouds | cloudy | light snow | light snow | heavy snow | light snow | heavy snow | |
Cloud base (m) | 1600 | 2700 | 2400 | 2450 | 2650 | 2850 | 4900 | 5950 | 6150 | 4350 | 850 | 600 | 550 | 600 | 600 | 550 | ||
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
 cm | — | — | — | — | — | 1 | — | — | — | — | — | — | — | 1 | 5 | 14 | 2 | 17 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
max °C | -1 | 0 | 0 | 1 | 0 | 2 | 1 | 2 | 3 | 4 | 4 | 3 | -2 | -4 | -5 | -5 | -5 | -5 |
min °C | -2 | -1 | -1 | 0 | 0 | 0 | 1 | 1 | 3 | 4 | 4 | -1 | -3 | -5 | -6 | -5 | -5 | -6 |
chill °C | -9 | -5 | -5 | -5 | -5 | -5 | -4 | -4 | 0 | 2 | 3 | -6 | -9 | -12 | -14 | -13 | -11 | -6 |
Freezing level m | 1700 | 2000 | 2000 | 2250 | 2250 | 2400 | 2200 | 2350 | 2550 | 2650 | 2650 | 2200 | 1550 | 1400 | 1300 | 1300 | 1350 | 1200 |
 | 7:39 | — | — | 7:41 | — | — | 7:43 | — | — | 7:43 | — | — | 7:46 | — | — | 7:47 | — | — |
 | — | 6:02 | — | — | 6:01 | — | — | 6:00 | — | — | 5:58 | — | — | 5:55 | — | — | 5:54 | — |
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South Twin Sister Weather (Days 0-3):
The weather forecast for South Twin Sister is: A dusting of new snow. Freeze-thaw conditions (max 3°C on Sun night, min -2°C on Fri morning). Wind will be generally light.
South Twin Sister Weather (Days 3-6):
A heavy fall of snow, heaviest during Wed night. Freeze-thaw conditions (max 4°C on Mon morning, min -6°C on Tue night). Winds decreasing (fresh winds from the S on Tue night, calm by Wed 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.