KIAD - Washington/Dulles Intl, VA, US
| Potential Impact | None | Slight | Moderate | High |
| Time | 10/08Z | 10/09Z | 10/10Z | 10/11Z | 10/12Z | 10/13Z | 10/14Z | 10/15Z | 10/16Z | 10/17Z | 10/18Z | 10/19Z | 10/20Z |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp | 72 | 72 | 72 | 70 | 71 | 72 | 74 | 78 | 81 | 84 | 86 | 84 | |
| Dewpt | 63 | 63 | 64 | 68 | 70 | 70 | 71 | 72 | 72 | 73 | 73 | 73 | |
| Altim | 1015.3 | 1014.6 | 1015 | 1015 | 1015 | 1015.3 | 1014.6 | 1014 | 1013.3 | 1013 | 1011.6 | 1011.6 | |
| VIS | 10+ | 10+ | 10+ | 4 | 5 | 5 | 6 | 7 | 10+ | 10+ | 10+ | 10+ | |
| CIG | 19000 | 8000 | 8000 | 4800 | 5000 | 700 | 900 | 1100 | 7000 | 11000 | 14000 | 8000 | |
| Cover | OVC | OVC | OVC | OVC | OVC | OVC | BKN | BKN | BKN | BKN | BKN | BKN | |
| FltCat | VFR | VFR | VFR | MVFR | MVFR | IFR | IFR | MVFR | VFR | VFR | VFR | VFR | |
| WX | -- | -- | -- | BR | -RA BR | -RA BR | BR | -- | -- | -- | -- | -- | |
| WDir | 170 | 170 | 210 | 180 | 180 | 200 | 210 | 220 | 200 | 210 | 190 | 210 | |
| WSpd | 6 | 6 | 7 | 8 | 7 | 7 | 9 | 12 | 11 | 12 | 12 | 11 | |
| WGst | -- | -- | -- | -- | -- | -- | -- | 18 | 20 | -- | 21 | 18 |
METAR KIAD 100752Z 17006KT 10SM SCT170 OVC190 22/17 A2998 RMK AO2 SLP149 T02220172
METAR KIAD 100852Z 17006KT 10SM BKN080 OVC130 22/17 A2996 RMK AO2 SLP144 T02220172 56018
METAR KIAD 100952Z 21007KT 10SM BKN080 OVC130 22/18 A2997 RMK AO2 SLP147 T02220178
METAR KIAD 101052Z 18008KT 4SM BR SCT029 OVC048 21/20 A2997 RMK AO2 RAB13E48 SLP147 P0018 T02110200
METAR KIAD 101152Z 18007KT 5SM -RA BR FEW006 SCT029 OVC050 22/21 A2997 RMK AO2 RAB1055 SLP145 P0004 60022 70022 T02170211 10233 20206 50001
METAR KIAD 101252Z 20007KT 5SM -RA BR BKN007 OVC050 22/21 A2998 RMK AO2 SLP147 P0001 T02220211
METAR KIAD 101352Z 21009KT 6SM BR BKN009 BKN075 23/22 A2996 RMK AO2 RAE1253 SLP142 P0000 T02330217
METAR KIAD 101452Z 22012G18KT 7SM BKN011 BKN075 26/22 A2994 RMK AO2 SLP136 60001 T02560222 58009
METAR KIAD 101552Z 20011G20KT 10SM SCT015 BKN070 BKN250 27/22 A2992 RMK AO2 SLP128 T02720222
METAR KIAD 101652Z 21012KT 10SM FEW020 BKN110 BKN250 29/23 A2991 RMK AO2 SLP124 T02890228
METAR KIAD 101752Z 19012G21KT 10SM FEW080 BKN140 BKN250 30/23 A2987 RMK AO2 SLP110 60001 T03000228 10306 20217 58025
METAR KIAD 101852Z 21011G18KT 10SM SCT030 BKN080 BKN250 29/23 A2987 RMK AO2 SLP112 T02890228