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| Point Forecast: 17 Miles ENE Mount St Helens WA 46.27N 121.86W (Elev. 4833 ft) |
Last Update: 6:04 am PDT Sep 27, 2021 |
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| Date | 09/27 | 09/28 | ||||||||||||||||||||||
| Hour (PDT) | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 |
| Temperature (°F) | 45 | 45 | 45 | 44 | 44 | 45 | 45 | 45 | 45 | 44 | 43 | 43 | 42 | 41 | 40 | 40 | 39 | 38 | 38 | 38 | 38 | 38 | 38 | 38 |
| Dewpoint (°F) | 45 | 44 | 44 | 44 | 44 | 44 | 44 | 44 | 44 | 43 | 43 | 42 | 41 | 41 | 40 | 39 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 37 |
| Wind Chill (°F) | 39 | 41 | 40 | 39 | 41 | 40 | 40 | 40 | 40 | 40 | 38 | 39 | 38 | 37 | 36 | 35 | 33 | 32 | 33 | 33 | 32 | 33 | 32 | 32 |
| Surface Wind (mph) | 8 | 8 | 6 | 8 | 9 | 8 | 9 | 9 | 8 | 8 | 8 | 7 | 8 | 9 | 9 | 10 | 9 | 10 | 10 | 11 | 13 | 11 | 10 | 10 |
| Wind Dir | WSW | WSW | SW | SSW | SSW | SSW | SSW | SSW | SSW | SW | WSW | WSW | SW | SW | SW | SW | WSW | SW | SW | SW | SW | SW | SW | SW |
| Gust | 18 | |||||||||||||||||||||||
| Sky Cover (%) | 99 | 99 | 87 | 72 | 85 | 87 | 81 | 71 | 86 | 90 | 94 | 93 | 93 | 93 | 90 | 90 | 90 | 84 | 84 | 84 | 91 | 91 | 91 | 91 |
| Precipitation Potential (%) | 100 | 97 | 94 | 91 | 88 | 86 | 86 | 88 | 90 | 92 | 92 | 93 | 93 | 93 | 93 | 93 | 93 | 93 | 93 | 93 | 93 | 93 | 93 | 94 |
| Relative Humidity (%) | 99 | 99 | 99 | 99 | 99 | 98 | 97 | 96 | 96 | 96 | 97 | 98 | 99 | 99 | 99 | 99 | 98 | 98 | 98 | 99 | 99 | 99 | 97 | 96 |
| Rain | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | -- |
| Snow | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 09/29 | |||||||||||||||||||||||
| Hour (PDT) | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 |
| Temperature (°F) | 38 | 38 | 38 | 38 | 38 | 38 | 39 | 39 | 40 | 40 | 40 | 40 | 39 | 38 | 37 | 37 | 36 | 36 | 36 | 36 | 36 | 36 | 35 | 35 |
| Dewpoint (°F) | 37 | 38 | 38 | 38 | 37 | 37 | 38 | 38 | 38 | 38 | 38 | 37 | 37 | 37 | 37 | 36 | 36 | 36 | 36 | 36 | 35 | 35 | 34 | 33 |
| Wind Chill (°F) | 32 | 32 | 32 | 32 | 32 | 32 | 33 | 33 | 35 | 35 | 35 | 35 | 34 | 33 | 33 | 33 | 32 | 33 | 33 | 33 | 33 | 33 | 32 | 30 |
| Surface Wind (mph) | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 8 |
| Wind Dir | SW | SW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | W | W | W | WSW | WSW | WSW | SW | SW | SW | SW | SW | SW | SW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 91 | 91 | 89 | 89 | 89 | 88 | 88 | 88 | 89 | 89 | 89 | 84 | 84 | 84 | 77 | 77 | 77 | 67 | 67 | 67 | 71 | 71 | 71 | 74 |
| Precipitation Potential (%) | 94 | 94 | 94 | 94 | 94 | 90 | 90 | 90 | 90 | 90 | 90 | 42 | 42 | 42 | 42 | 42 | 42 | 6 | 6 | 6 | 6 | 6 | 6 | 7 |
| Relative Humidity (%) | 96 | 97 | 98 | 98 | 97 | 96 | 96 | 96 | 95 | 94 | 93 | 91 | 92 | 94 | 97 | 98 | 98 | 98 | 97 | 97 | 97 | 96 | 95 | 94 |
| Rain | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Chc | Chc | Chc | Chc | Chc | Chc | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Snow | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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