– Lat/Long: 48.71° N 121.99° W
South Twin Sister
Weather Forecast, United StatesIssued: 4 pm Mon 13 Apr Local TimeUpdates in: hr min sUpdate imminent
Issued: 4 pm Mon 13 Apr Local Time
Updates in:
Update imminent hr min s
Issued: 4 pm Mon 13 Apr 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 Wed morning. Temperatures will be below freezing (max -1°C on Mon afternoon, min -7°C on Tue night). Winds decreasing (strong winds from the S on Tue afternoon, light winds from the WNW by Wed night). | Days 5–7 Weather SummaryA dusting of new snow. Freeze-thaw conditions (max 6°C on Sat night, min -4°C on Thu afternoon). Wind will be generally light. | ||||||||||||||||
Mon 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  | |  |  |  |  |  | |  | |  | | | | | |
cloudy | light snow | mod. snow | mod. snow | mod. snow | heavy snow | snow shwrs | snow shwrs | some clouds | some clouds | some clouds | some clouds | light snow | some clouds | some clouds | some clouds | some clouds | |
km/h | |||||||||||||||||
 |  |  |  |  |  | ||||||||||||
— | 2 | 7 | 8 | 7 | 13 | 3 | 2 | — | — | — | — | 1 | — | — | — | — | |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
max °C | -1 | -1 | -3 | -3 | -2 | -7 | -6 | -5 | -5 | -4 | -3 | -4 | -2 | -2 | 0 | 3 | 6 |
min °C | -1 | -3 | -3 | -3 | -7 | -7 | -6 | -6 | -6 | -4 | -4 | -4 | -3 | -2 | -1 | 1 | 4 |
-5 | -10 | -10 | -12 | -15 | -12 | -10 | -10 | -9 | -7 | -7 | -4 | -3 | -2 | -3 | -2 | 1 | |
1350 | 1100 | 1050 | 1050 | 350 | 650 | 750 | 0 | 800 | 1050 | 400 | 950 | 1150 | 900 | 1450 | 1850 | 2350 | |
Cloud base (m) | 600 | 550 | 550 | 550 | 600 | 550 | 600 | 600 | 600 | 650 | 850 | 600 | 650 | 650 | 650 | 1550 | 2750 |
 | — | — | 6:18 | — | — | 6:16 | — | — | 6:15 | — | — | 6:13 | — | — | 6:11 | — | — |
 | 7:55 | — | — | 7:57 | — | — | 7:59 | — | — | — | 8:00 | — | — | 8:01 | — | — | 8:02 |
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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 Wed morning. Temperatures will be below freezing (max -1°C on Mon afternoon, min -7°C on Tue night). Winds decreasing (strong winds from the S on Tue afternoon, light winds from the WNW by Wed night).
South Twin Sister Weather (Days 3-6):
A dusting of new snow. Freeze-thaw conditions (max 6°C on Sat night, min -4°C on Thu afternoon). Wind will be generally light.
This table gives the weather forecast for South Twin Sister at the specific elevation of 1500 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.