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| Point Forecast: 2 Miles NNW Washington DC 38.91N 77.05W (Elev. 89 ft) |
Last Update: 9:29 am EST Jan 29, 2023 |
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| Date | 01/29 | 01/30 | ||||||||||||||||||||||
| Hour (EST) | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 |
| Temperature (°F) | 49 | 50 | 50 | 49 | 48 | 48 | 47 | 46 | 46 | 45 | 44 | 44 | 43 | 43 | 42 | 42 | 42 | 42 | 41 | 41 | 41 | 44 | 47 | 51 |
| Dewpoint (°F) | 33 | 34 | 35 | 37 | 39 | 40 | 41 | 42 | 43 | 43 | 42 | 42 | 41 | 41 | 41 | 41 | 41 | 40 | 40 | 40 | 40 | 42 | 44 | 44 |
| Wind Chill (°F) | 44 | 45 | 45 | 44 | 43 | 43 | 42 | 41 | 42 | 41 | 41 | 41 | 40 | 41 | 40 | 42 | 42 | 42 | 41 | 41 | 41 | 42 | 46 | |
| Surface Wind (mph) | 13 | 13 | 13 | 13 | 11 | 10 | 10 | 9 | 8 | 7 | 6 | 5 | 5 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 |
| Wind Dir | S | SW | SW | S | S | S | SW | SW | SW | SW | SW | SW | SW | SW | SW | W | W | W | W | NW | W | S | S | S |
| Gust | 21 | 21 | 21 | 21 | 20 | 20 | ||||||||||||||||||
| Sky Cover (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 94 | 91 | 96 | 90 | 69 | 49 | 46 | 37 |
| Precipitation Potential (%) | 38 | 51 | 41 | 32 | 22 | 19 | 12 | 8 | 8 | 8 | 6 | 6 | 6 | 4 | 4 | 4 | 1 | 1 | 1 | 11 | 11 | 11 | 9 | 9 |
| Relative Humidity (%) | 54 | 54 | 56 | 63 | 71 | 74 | 79 | 86 | 89 | 93 | 93 | 93 | 93 | 93 | 96 | 96 | 96 | 93 | 96 | 96 | 96 | 93 | 89 | 77 |
| Rain | Chc | Chc | Chc | Chc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Snow | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Fog | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Mixing Height (x100ft) | 5 | 6 | 6 | 5 | 5 | 5 | 5 | 4 | 4 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 3 | 6 | 9 |
| Haines Index | 4 | 3 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Lightning Activity Level | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Transport Wind (mph) | 14 | 16 | 16 | 15 | 14 | 14 | 14 | 13 | 10 | 8 | 6 | 5 | 3 | 3 | 2 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 3 |
| Transport Wind Dir | S | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | W | W | N | N | NE | E | E | SE | SE | SE | S |
| Ventilation Rate (x1000 mph-ft) | 7 | 10 | 10 | 8 | 7 | 7 | 7 | 6 | 4 | 2 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 3 |
| Date | 01/31 | |||||||||||||||||||||||
| Hour (EST) | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 |
| Temperature (°F) | 54 | 56 | 57 | 58 | 57 | 55 | 53 | 52 | 50 | 49 | 47 | 46 | 45 | 44 | 43 | 41 | 40 | 39 | 38 | 37 | 37 | 37 | 38 | 38 |
| Dewpoint (°F) | 45 | 45 | 44 | 45 | 45 | 45 | 45 | 45 | 44 | 43 | 42 | 41 | 39 | 38 | 37 | 35 | 34 | 32 | 31 | 29 | 28 | 27 | 26 | 25 |
| Wind Chill (°F) | 47 | 46 | 43 | 41 | 40 | 39 | 37 | 34 | 33 | 32 | 31 | 30 | 30 | 30 | 32 | 32 | ||||||||
| Surface Wind (mph) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 7 | 8 | 9 | 9 | 9 | 9 | 10 | 11 | 11 | 11 | 10 | 9 | 9 | 9 | 9 | 8 |
| Wind Dir | S | S | S | S | SW | SW | SW | W | W | W | W | W | NW | NW | NW | NW | N | N | N | N | N | N | N | N |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 44 | 43 | 42 | 57 | 57 | 74 | 67 | 59 | 54 | 43 | 37 | 42 | 52 | 57 | 61 | 68 | 71 | 72 | 74 | 75 | 77 | 82 | 84 | 87 |
| Precipitation Potential (%) | 9 | 4 | 4 | 4 | 5 | 5 | 5 | 8 | 8 | 8 | 3 | 3 | 3 | 3 | 3 | 3 | 9 | 9 | 9 | 13 | 13 | 13 | 13 | 13 |
| Relative Humidity (%) | 71 | 66 | 62 | 62 | 64 | 69 | 74 | 77 | 80 | 80 | 83 | 83 | 79 | 79 | 79 | 79 | 79 | 76 | 76 | 72 | 70 | 67 | 62 | 59 |
| Rain | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Snow | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Fog | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Mixing Height (x100ft) | 13 | 15 | 17 | 17 | 16 | 11 | 6 | 2 | 1 | 3 | 6 | 9 | 11 | 12 | 14 | 16 | 17 | 19 | 20 | 21 | 22 | 22 | ||
| Haines Index | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Lightning Activity Level | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Transport Wind (mph) | 5 | 5 | 6 | 7 | 7 | 6 | 5 | 3 | 2 | 1 | 2 | 6 | 9 | 13 | 14 | 14 | 13 | 13 | 13 | 12 | 10 | 9 | 8 | 7 |
| Transport Wind Dir | S | S | S | SW | SW | SW | SW | SW | SW | SW | SW | W | NW | N | N | N | N | N | N | N | N | N | N | N |
| Ventilation Rate (x1000 mph-ft) | 6 | 8 | 10 | 12 | 11 | 7 | 3 | 0 | 0 | 0 | 0 | 2 | 5 | 11 | 15 | 17 | 18 | 20 | 22 | 22 | 20 | 19 | 17 | 16 |
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