– Lat/Long: 48.71° N 121.99° W
South Twin Sister
Weather Forecast, United StatesIssued: 4 pm Fri 20 Mar Local TimeUpdates in: hr min sUpdate imminent
Issued: 4 pm Fri 20 Mar Local Time
Updates in:
Update imminent hr min s
Issued: 4 pm Fri 20 Mar Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–4 Weather SummaryLight rain (total 3mm) at first, then becoming colder with a dusting of snow on Fri afternoon. Freeze-thaw conditions (max 3°C on Fri afternoon, min -6°C on Sat morning). Winds decreasing (fresh winds from the SSW on Fri afternoon, calm by Sun night). | Days 5–7 Weather SummaryA heavy fall of snow, heaviest during Wed morning. Freeze-thaw conditions (max 1°C on Tue afternoon, min -7°C on Wed morning). Winds increasing (calm on Mon afternoon, severe gales from the SSW by Tue night). | ||||||||||||||||
Fri 20 | Saturday 21 | Sunday 22 | Monday 23 | Tuesday 24 | Wednesday 25 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  | |  | |  | | | | | | |  |  |  |  | |
light snow | cloudy | some clouds | some clouds | some clouds | some clouds | cloudy | cloudy | some clouds | some clouds | cloudy | light snow | light snow | light snow | heavy snow | mod. snow | mod. snow | |
km/h | |||||||||||||||||
 |  |  |  |  |  | ||||||||||||
2 | — | — | — | — | — | — | — | — | — | — | 5 | 4 | 5 | 14 | 6 | 7 | |
3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
max °C | 3 | -1 | -5 | -5 | -4 | -5 | -4 | -2 | -2 | -2 | 0 | -3 | 1 | -2 | -6 | -7 | -6 |
min °C | 1 | -4 | -6 | -5 | -5 | -5 | -5 | -4 | -2 | -2 | -1 | -4 | -1 | -6 | -7 | -7 | -7 |
-3 | -9 | -10 | -10 | -9 | -9 | -8 | -6 | -5 | -4 | -3 | -10 | -9 | -18 | -16 | -16 | -15 | |
1650 | 1050 | 800 | 950 | 600 | 900 | 1000 | 1050 | 1200 | 1300 | 1500 | 950 | 1550 | 650 | 600 | 650 | 400 | |
Cloud base (m) | 600 | 800 | 650 | 750 | 1750 | 600 | 650 | 600 | 600 | 800 | 2100 | 750 | 500 | 550 | 600 | 600 | 600 |
 | — | — | 7:09 | — | — | 7:07 | — | — | 7:05 | — | — | 7:03 | — | — | 7:01 | — | — |
 | 7:20 | — | — | 7:21 | — | — | 7:22 | — | — | 7:23 | — | — | 7:25 | — | — | 7:27 | — |
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South Twin Sister Weather (Days 0-3):
The weather forecast for South Twin Sister is: Light rain (total 3mm) at first, then becoming colder with a dusting of snow on Fri afternoon. Freeze-thaw conditions (max 3°C on Fri afternoon, min -6°C on Sat morning). Winds decreasing (fresh winds from the SSW on Fri afternoon, calm by Sun night).
South Twin Sister Weather (Days 3-6):
A heavy fall of snow, heaviest during Wed morning. Freeze-thaw conditions (max 1°C on Tue afternoon, min -7°C on Wed morning). Winds increasing (calm on Mon afternoon, severe gales from the SSW by Tue night).
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.