| Point Forecast: 2 Miles NNW Washington DC 38.91N 77.05W (Elev. 89 ft) |
Last Update: 1:30 pm EDT Jul 13, 2025 |
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| Date | 07/13 | 07/14 | ||||||||||||||||||||||
| Hour (EDT) | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 |
| Temperature (°F) | 88 | 87 | 87 | 87 | 85 | 84 | 80 | 79 | 78 | 77 | 77 | 76 | 75 | 75 | 75 | 74 | 75 | 77 | 79 | 81 | 83 | 85 | 86 | 86 |
| Dewpoint (°F) | 76 | 76 | 75 | 75 | 75 | 75 | 75 | 75 | 75 | 74 | 74 | 74 | 75 | 74 | 74 | 74 | 74 | 75 | 76 | 76 | 76 | 76 | 77 | 77 |
| Heat Index (°F) | 99 | 98 | 96 | 96 | 94 | 92 | 85 | 79 | 78 | 77 | 77 | 76 | 75 | 75 | 75 | 75 | 77 | 79 | 87 | 91 | 94 | 97 | 97 | |
| Surface Wind (mph) | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 5 | 6 |
| Wind Dir | SE | SE | SE | SE | S | S | SE | S | S | S | S | S | S | S | S | SE | SE | S | S | S | S | S | S | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 88 | 78 | 68 | 59 | 66 | 50 | 54 | 59 | 63 | 59 | 61 | 76 | 64 | 64 | 75 | 75 | 71 | 59 | 64 | 51 | 70 | 56 | 61 | 74 |
| Precipitation Potential (%) | 81 | 67 | 52 | 38 | 31 | 25 | 31 | 38 | 45 | 38 | 41 | 28 | 20 | 26 | 27 | 24 | 19 | 17 | 16 | 16 | 16 | 34 | 42 | 61 |
| Relative Humidity (%) | 68 | 70 | 68 | 68 | 72 | 74 | 85 | 88 | 91 | 90 | 90 | 94 | 100 | 97 | 97 | 100 | 97 | 94 | 91 | 85 | 80 | 75 | 75 | 75 |
| Rain | Ocnl | Lkly | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | SChc | Chc | Chc | SChc | SChc | SChc | SChc | SChc | SChc | Chc | Chc | Lkly |
| Thunder | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | SChc | SChc | SChc | SChc | Chc | Chc | Lkly |
| Snow | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Fog | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Mixing Height (x100ft) | 26 | 26 | 26 | 25 | 19 | 10 | 7 | 7 | 6 | 6 | 6 | 5 | 5 | 5 | 6 | 6 | 8 | 9 | 14 | 19 | 25 | 28 | 29 | 29 |
| Haines Index | ||||||||||||||||||||||||
| Lightning Activity Level | ||||||||||||||||||||||||
| Transport Wind (mph) | 8 | 8 | 8 | 9 | 9 | 9 | 7 | 6 | 8 | 8 | 7 | 7 | 8 | 7 | 7 | 6 | 7 | 6 | 6 | 7 | 6 | 7 | 8 | 8 |
| Transport Wind Dir | SE | SE | S | S | S | S | S | SE | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Ventilation Rate (x1000 mph-ft) | 20 | 21 | 21 | 23 | 17 | 9 | 5 | 4 | 5 | 5 | 4 | 4 | 4 | 3 | 4 | 3 | 5 | 6 | 8 | 14 | 15 | 20 | 23 | 23 |
| Date | 07/15 | |||||||||||||||||||||||
| Hour (EDT) | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 |
| Temperature (°F) | 87 | 86 | 85 | 85 | 83 | 80 | 79 | 78 | 77 | 77 | 76 | 76 | 75 | 74 | 74 | 74 | 75 | 76 | 78 | 80 | 82 | 84 | 85 | 86 |
| Dewpoint (°F) | 78 | 77 | 76 | 76 | 77 | 76 | 76 | 76 | 75 | 75 | 74 | 74 | 74 | 73 | 73 | 73 | 74 | 75 | 75 | 76 | 76 | 76 | 76 | 76 |
| Heat Index (°F) | 100 | 97 | 94 | 94 | 92 | 86 | 79 | 78 | 77 | 77 | 76 | 76 | 75 | 75 | 76 | 78 | 86 | 89 | 93 | 94 | 96 | |||
| Surface Wind (mph) | 5 | 5 | 5 | 5 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 5 |
| Wind Dir | SE | SE | SE | S | S | SE | S | S | SE | S | S | S | S | SW | SW | S | S | S | S | S | SE | S | S | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 78 | 76 | 78 | 81 | 83 | 81 | 71 | 76 | 81 | 81 | 81 | 81 | 81 | 80 | 80 | 79 | 78 | 77 | 77 | 76 | 76 | 77 | 79 | 80 |
| Precipitation Potential (%) | 67 | 63 | 66 | 71 | 74 | 57 | 57 | 57 | 57 | 57 | 57 | 30 | 30 | 30 | 30 | 30 | 30 | 34 | 34 | 34 | 34 | 34 | 34 | 70 |
| Relative Humidity (%) | 75 | 75 | 75 | 75 | 82 | 88 | 91 | 94 | 94 | 94 | 94 | 94 | 97 | 97 | 97 | 97 | 97 | 97 | 91 | 88 | 82 | 77 | 75 | 72 |
| Rain | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Lkly |
| Thunder | Lkly | Lkly | Lkly | Lkly | Lkly | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | SChc | SChc | SChc | Chc |
| Snow | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Fog | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Mixing Height (x100ft) | 26 | 23 | 19 | 14 | 9 | 6 | 5 | 6 | 7 | 6 | 6 | 6 | 5 | 6 | 6 | 7 | 8 | 9 | 10 | 11 | 15 | 22 | 30 | 34 |
| Haines Index | ||||||||||||||||||||||||
| Lightning Activity Level | ||||||||||||||||||||||||
| Transport Wind (mph) | 8 | 8 | 8 | 8 | 9 | 9 | 8 | 6 | 5 | 6 | 7 | 7 | 6 | 5 | 3 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 5 | 5 |
| Transport Wind Dir | S | S | S | SE | NE | N | N | S | S | S | SW | SW | SW | SW | SW | W | NW | NW | N | N | NE | NE | SE | S |
| Ventilation Rate (x1000 mph-ft) | 21 | 18 | 15 | 11 | 8 | 5 | 4 | 3 | 3 | 4 | 4 | 4 | 3 | 3 | 2 | 1 | 2 | 2 | 2 | 3 | 4 | 7 | 15 | 17 |
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