– Lat/Long: 48.71° N 121.99° W
South Twin Sister Weather Forecast
Cascade Range · United StatesIssued: 4 pm Tue 27 Oct Local Time
Updates in:
Update imminent hr min s
Issued: 4 pm Tue 27 Oct 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 night. Temperatures will be below freezing (max -4°C on Tue afternoon, min -7°C on Wed morning). Winds decreasing (fresh winds from the WSW on Tue night, calm by Wed night). | Days 5–7 Weather SummaryA light covering of new snow mostly falling on Fri afternoon. Freeze-thaw conditions (max 5°C on Mon morning, min -7°C on Sat morning). Wind will be generally light. | ||||||||||||||||
Tue 27 | Wednesday 28 | Thursday 29 | Friday 30 | Saturday 31 | Sunday 1 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  | |  |  |  | |  | |  | | | | | | | |
light snow | heavy snow | snow shwrs | snow shwrs | some clouds | some clouds | clear | some clouds | cloudy | light snow | cloudy | light snow | some clouds | some clouds | some clouds | some clouds | some clouds | |
Cloud base (m) | 550 | 550 | 600 | 650 | 850 | 1800 | 2100 | 600 | 2250 | 700 | 700 | 600 | 750 | 650 | 600 | 650 | 600 |
km/h | |||||||||||||||||
 |  |  |  |  |  | ||||||||||||
 cm | 4 | 31 | 2 | 3 | — | — | — | — | — | 5 | — | 1 | — | — | — | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
max °C | -4 | -5 | -6 | -6 | -6 | -6 | -5 | -4 | -4 | -6 | -6 | -6 | -5 | -6 | -6 | -4 | 1 |
min °C | -4 | -6 | -7 | -6 | -6 | -6 | -5 | -5 | -5 | -6 | -6 | -7 | -6 | -6 | -6 | -5 | -3 |
chill °C | -11 | -13 | -13 | -8 | -6 | -12 | -10 | -10 | -10 | -13 | -12 | -15 | -13 | -10 | -12 | -11 | -9 |
Freezing level m | 1500 | 1200 | 1250 | 1200 | 1100 | 1350 | 1400 | 1500 | 1250 | 1100 | 1200 | 1200 | 1350 | 1100 | 1100 | 1150 | 2200 |
 | — | — | 7:47 | — | — | 7:48 | — | — | 7:50 | — | — | 7:52 | — | — | 6:54 | — | — |
 | 5:55 | — | — | 5:54 | — | — | 5:52 | — | — | 5:51 | — | — | 5:50 | — | — | 4:47 | — |
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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 night. Temperatures will be below freezing (max -4°C on Tue afternoon, min -7°C on Wed morning). Winds decreasing (fresh winds from the WSW on Tue night, calm by Wed night).
South Twin Sister Weather (Days 3-6):
A light covering of new snow mostly falling on Fri afternoon. Freeze-thaw conditions (max 5°C on Mon morning, min -7°C on Sat morning). Wind will be generally light.
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.