| Point Forecast: 2 Miles NNW Washington DC 38.91N 77.05W (Elev. 89 ft) |
Last Update: 4:32 pm EDT May 7, 2024 |
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| Date | 05/07 | 05/08 | ||||||||||||||||||||||
| Hour (EDT) | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| Temperature (°F) | 77 | 75 | 72 | 70 | 69 | 69 | 68 | 68 | 67 | 67 | 67 | 67 | 66 | 68 | 71 | 77 | 81 | 83 | 84 | 86 | 86 | 86 | 87 | 86 |
| Dewpoint (°F) | 66 | 66 | 66 | 67 | 66 | 66 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 64 | 63 | 64 | 63 | 59 | 58 | 57 | 56 | 56 | 57 |
| Heat Index (°F) | 77 | 75 | 77 | 83 | 84 | 84 | 85 | 85 | 85 | 86 | 85 | |||||||||||||
| Surface Wind (mph) | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 3 | 5 | 6 | 6 | 7 | 7 | 8 | 9 | 10 | 11 | 10 | 11 | 10 | 9 |
| Wind Dir | SE | SE | SE | SE | S | S | S | S | S | S | S | S | S | SW | SW | SW | W | W | W | W | W | W | W | W |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 62 | 63 | 73 | 60 | 77 | 72 | 80 | 79 | 85 | 87 | 85 | 85 | 80 | 74 | 62 | 48 | 39 | 31 | 27 | 28 | 26 | 22 | 20 | 20 |
| Precipitation Potential (%) | 23 | 18 | 12 | 5 | 4 | 5 | 7 | 19 | 34 | 49 | 34 | 27 | 21 | 6 | 6 | 6 | 6 | 6 | 6 | 17 | 17 | 17 | 17 | 17 |
| Relative Humidity (%) | 69 | 74 | 81 | 90 | 90 | 90 | 90 | 90 | 93 | 93 | 93 | 93 | 97 | 90 | 79 | 62 | 56 | 51 | 43 | 39 | 37 | 36 | 35 | 37 |
| Rain | SChc | SChc | -- | -- | -- | -- | -- | SChc | Chc | Chc | Chc | Chc | SChc | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc |
| Thunder | SChc | SChc | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc |
| Snow | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Fog | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Mixing Height (x100ft) | 34 | 26 | 17 | 8 | 2 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 3 | 16 | 32 | 48 | 60 | 69 | 75 | 82 | 84 | 78 | 57 |
| Haines Index | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 |
| Lightning Activity Level | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 |
| Transport Wind (mph) | 8 | 9 | 8 | 6 | 5 | 5 | 6 | 6 | 6 | 5 | 5 | 3 | 3 | 5 | 8 | 14 | 17 | 18 | 17 | 16 | 17 | 17 | 17 | 14 |
| Transport Wind Dir | S | S | S | S | SE | SE | SE | SE | SE | S | S | S | S | SW | SW | W | W | W | W | W | W | W | W | W |
| Ventilation Rate (x1000 mph-ft) | 27 | 23 | 13 | 5 | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 12 | 45 | 82 | 108 | 117 | 119 | 139 | 143 | 133 | 79 |
| Date | 05/09 | |||||||||||||||||||||||
| Hour (EDT) | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| Temperature (°F) | 84 | 82 | 79 | 76 | 73 | 71 | 70 | 69 | 67 | 66 | 66 | 67 | 68 | 69 | 71 | 73 | 75 | 76 | 76 | 77 | 78 | 79 | 80 | 79 |
| Dewpoint (°F) | 58 | 58 | 58 | 59 | 59 | 59 | 60 | 60 | 60 | 60 | 60 | 60 | 61 | 63 | 63 | 64 | 64 | 64 | 65 | 65 | 65 | 64 | 64 | 64 |
| Heat Index (°F) | 84 | 82 | 79 | 76 | 75 | 76 | 76 | 77 | 78 | 79 | 82 | 79 | ||||||||||||
| Surface Wind (mph) | 7 | 6 | 5 | 5 | 5 | 5 | 5 | 3 | 2 | 3 | 5 | 5 | 7 | 7 | 8 | 9 | 10 | 11 | 13 | 13 | 13 | 13 | 13 | 13 |
| Wind Dir | W | W | W | W | W | W | W | SW | SW | S | SE | SE | S | S | S | S | S | S | S | SW | SW | SW | SW | W |
| Gust | 18 | 18 | 18 | 18 | ||||||||||||||||||||
| Sky Cover (%) | 21 | 23 | 28 | 34 | 41 | 48 | 55 | 61 | 67 | 72 | 76 | 80 | 83 | 87 | 86 | 85 | 83 | 83 | 84 | 83 | 79 | 73 | 68 | 63 |
| Precipitation Potential (%) | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 45 | 45 | 45 | 45 | 45 | 45 | 68 | 68 | 68 | 68 | 68 | 68 | 87 | 87 | 87 | 87 | 87 |
| Relative Humidity (%) | 41 | 44 | 49 | 56 | 62 | 66 | 71 | 73 | 78 | 81 | 81 | 78 | 78 | 81 | 76 | 73 | 69 | 66 | 69 | 67 | 64 | 60 | 58 | 60 |
| Rain | SChc | SChc | SChc | SChc | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl |
| Thunder | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc |
| Snow | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Fog | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Mixing Height (x100ft) | 29 | 6 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 2 | 13 | 30 | 50 | |||||||
| Haines Index | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 |
| Lightning Activity Level | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Transport Wind (mph) | 9 | 6 | 3 | 2 | 2 | 2 | 3 | 5 | 6 | 6 | 7 | 6 | 6 | 9 | 17 | 29 | 41 | |||||||
| Transport Wind Dir | NW | NW | N | NE | NE | E | E | E | E | E | E | SE | SE | SE | S | SW | W | |||||||
| Ventilation Rate (x1000 mph-ft) | 26 | 4 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 2 | 23 | 88 | 205 | |||||||
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