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| Point Forecast: 17 Miles ENE Mount St Helens WA 46.27N 121.86W (Elev. 4833 ft) |
Last Update: 10:05 am PDT Sep 28, 2021 |
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| Date | 09/28 | 09/29 | ||||||||||||||||||||||
| Hour (PDT) | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 |
| Temperature (°F) | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 39 | 38 | 37 | 37 | 37 | 36 | 36 | 35 | 35 | 35 | 35 | 35 | 35 | 36 | 36 | 37 |
| Dewpoint (°F) | 39 | 39 | 39 | 39 | 39 | 38 | 38 | 38 | 37 | 37 | 36 | 36 | 35 | 35 | 35 | 35 | 35 | 35 | 34 | 34 | 34 | 34 | 34 | 33 |
| Wind Chill (°F) | 34 | 33 | 34 | 35 | 34 | 35 | 35 | 34 | 34 | 34 | 32 | 33 | 33 | 31 | 31 | 29 | 28 | 28 | 28 | 29 | 28 | 30 | 30 | 30 |
| Surface Wind (mph) | 9 | 9 | 9 | 10 | 9 | 8 | 8 | 6 | 7 | 2 | 5 | 3 | 3 | 6 | 8 | 8 | 8 | 8 | 8 | 11 | 9 | 9 | 13 | 10 |
| Wind Dir | SW | WSW | SW | WSW | W | W | WSW | W | WSW | W | WSW | SSW | SW | SSW | S | S | S | SSE | SSE | S | SSE | SE | SSE | SSE |
| Gust | 18 | 21 | ||||||||||||||||||||||
| Sky Cover (%) | 93 | 94 | 90 | 91 | 90 | 92 | 92 | 88 | 81 | 72 | 74 | 71 | 84 | 79 | 79 | 79 | 81 | 81 | 81 | 81 | 81 | 81 | 71 | 71 |
| Precipitation Potential (%) | 90 | 83 | 78 | 77 | 75 | 78 | 79 | 45 | 42 | 38 | 31 | 29 | 28 | 22 | 22 | 22 | 22 | 22 | 22 | 33 | 33 | 33 | 33 | 33 |
| Relative Humidity (%) | 98 | 97 | 97 | 96 | 95 | 94 | 94 | 92 | 93 | 94 | 96 | 96 | 96 | 96 | 98 | 100 | 100 | 99 | 96 | 95 | 94 | 93 | 91 | 87 |
| Rain | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc |
| Thunder | -- | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Snow | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | Chc | Chc | Chc | -- | -- |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 09/30 | |||||||||||||||||||||||
| Hour (PDT) | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 |
| Temperature (°F) | 38 | 39 | 41 | 42 | 43 | 44 | 44 | 45 | 45 | 43 | 43 | 43 | 43 | 44 | 44 | 44 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 46 |
| Dewpoint (°F) | 33 | 32 | 32 | 33 | 34 | 35 | 36 | 36 | 37 | 35 | 35 | 35 | 35 | 36 | 37 | 39 | 40 | 41 | 40 | 41 | 41 | 42 | 42 | 43 |
| Wind Chill (°F) | 31 | 32 | 35 | 36 | 37 | 39 | 39 | 40 | 40 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 40 | 40 | 40 | 40 | 40 | 40 | 39 | 41 |
| Surface Wind (mph) | 11 | 14 | 13 | 14 | 13 | 10 | 10 | 11 | 11 | 11 | 11 | 11 | 11 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 13 | 13 |
| Wind Dir | S | S | S | S | S | S | SSE | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Gust | 18 | 22 | 21 | 22 | 21 | 18 | 18 | 18 | 18 | 18 | 18 | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 21 | 21 | ||
| Sky Cover (%) | 71 | 74 | 74 | 74 | 82 | 82 | 82 | 86 | 86 | 86 | 76 | 76 | 76 | 73 | 73 | 73 | 70 | 70 | 70 | 77 | 77 | 77 | 61 | 61 |
| Precipitation Potential (%) | 33 | 42 | 42 | 42 | 42 | 42 | 42 | 46 | 46 | 46 | 46 | 46 | 46 | 51 | 51 | 51 | 51 | 51 | 51 | 65 | 65 | 65 | 65 | 65 |
| Relative Humidity (%) | 81 | 75 | 72 | 70 | 70 | 70 | 71 | 71 | 72 | 73 | 73 | 73 | 73 | 74 | 77 | 81 | 84 | 87 | 85 | 87 | 87 | 88 | 89 | 91 |
| Rain | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Lkly | Lkly | Lkly | Lkly | Lkly |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Snow | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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