– Lat/Long: 48.71° N 121.99° W
South Twin Sister Weather Forecast
Cascade Range · United StatesIssued: 10 pm Tue 22 Sep Local Time
Updates in:
Update imminent hr min s
Issued: 10 pm Tue 22 Sep Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–4 Weather SummaryMild at first with light rain (total 8mm) on Thu night followed by colder weather and light fall of snow, heaviest on Fri afternoon. Freeze-thaw conditions (max 5°C on Wed night, min -2°C on Fri afternoon). Winds increasing (light winds from the SW on Wed morning, strong winds from the S by Thu night). | Days 5–7 Weather SummaryA light covering of new snow mostly falling on Fri night. Freeze-thaw conditions (max 3°C on Sat night, min -3°C on Fri night). Winds decreasing (fresh winds from the WSW on Fri night, calm by Sat night). | |||||||||||||||
Wednesday 23 | Thursday 24 | Friday 25 | Saturday 26 | Sunday 27 | ||||||||||||
night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  |  |  |  |  |  |  |  | | | | | | | |
some clouds | some clouds | rain shwrs | rain shwrs | cloudy | light rain | mod. rain | light snow | mod. snow | mod. snow | some clouds | some clouds | some clouds | cloudy | some clouds | some clouds | |
Cloud base (m) | 2650 | 1750 | 1800 | 6600 | 3050 | 2800 | 550 | 700 | 600 | 600 | 800 | 1750 | 6800 | 6550 | 6250 | 5650 |
km/h | ||||||||||||||||
 |  |  |  |  |  | |||||||||||
 cm | — | — | — | — | — | — | — | 3 | 9 | 8 | — | — | — | — | — | — |
mm | — | — | 0.3 | 0.1 | — | 0.2 | 7 | — | — | — | — | — | — | — | — | — |
max °C | 4 | 1 | 2 | 5 | 5 | 4 | 3 | 2 | -1 | -2 | -3 | 0 | 3 | 3 | 3 | 3 |
min °C | 1 | 1 | 2 | 3 | 5 | 3 | 2 | 0 | -2 | -3 | -3 | -1 | 1 | 3 | 3 | 1 |
chill °C | -3 | -3 | -2 | 0 | 1 | -2 | -5 | -7 | -10 | -10 | -8 | -5 | -1 | 3 | 1 | -3 |
Freezing level m | 2450 | 2300 | 2500 | 3150 | 3000 | 2700 | 2550 | 2100 | 1800 | 1600 | 1650 | 2150 | 2750 | 2750 | 2700 | 2450 |
 | — | 6:54 | — | — | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — | 7:01 | — | — |
 | — | — | 7:04 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:54 | — |
Loading...
South Twin Sister Weather (Days 0-3):
The weather forecast for South Twin Sister is: Mild at first with light rain (total 8mm) on Thu night followed by colder weather and light fall of snow, heaviest on Fri afternoon. Freeze-thaw conditions (max 5°C on Wed night, min -2°C on Fri afternoon). Winds increasing (light winds from the SW on Wed morning, strong winds from the S by Thu night).
South Twin Sister Weather (Days 3-6):
A light covering of new snow mostly falling on Fri night. Freeze-thaw conditions (max 3°C on Sat night, min -3°C on Fri night). Winds decreasing (fresh winds from the WSW on Fri night, calm by Sat 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.