KSEA - Seattle-Tacoma Intl, WA, US
| Potential Impact | None | Slight | Moderate | High |
| Time | 21/00Z | 21/01Z | 21/02Z | 21/03Z | 21/04Z | 21/05Z | 21/06Z | 21/07Z | 21/08Z | 21/09Z | 21/10Z | 21/11Z | 21/12Z |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp | 57 | 55 | 54 | 52 | 50 | 47 | 46 | 46 | 45 | 45 | 44 | 44 | 43 |
| Dewpt | 46 | 43 | 42 | 43 | 43 | 42 | 41 | 40 | 40 | 38 | 37 | 37 | 38 |
| Altim | 1019.7 | 1019.7 | 1020.1 | 1020.1 | 1020.4 | 1020.4 | 1019.7 | 1019.7 | 1019.4 | 1020.1 | 1020.4 | 1021.1 | 1020.4 |
| VIS | 10+ | 10+ | 10+ | 10+ | 10+ | 10+ | 10+ | 10+ | 10+ | 10+ | 10+ | 10+ | 10+ |
| CIG | 20000 | 24000 | 21000 | 20000 | 3000 | 18000 | 16000 | 15000 | 2500 | 2100 | 2600 | 3600 | 2700 |
| Cover | BKN | BKN | BKN | BKN | BKN | BKN | OVC | OVC | OVC | OVC | OVC | OVC | OVC |
| FltCat | VFR | VFR | VFR | VFR | MVFR | VFR | VFR | VFR | MVFR | MVFR | MVFR | VFR | MVFR |
| WX | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| WDir | 210 | 210 | 250 | 250 | 300 | 350 | 40 | 20 | 30 | 20 | 20 | 10 | 360 |
| WSpd | 12 | 13 | 7 | 7 | 5 | 10 | 9 | 11 | 8 | 9 | 11 | 11 | 12 |
| WGst | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
METAR KSEA 202353Z 21012KT 10SM FEW025 FEW040 BKN200 14/08 A3011 RMK AO2 SLP204 60010 T01390078 10144 20117 55000 $
METAR KSEA 210053Z 21013KT 10SM FEW035 SCT070 BKN240 13/06 A3011 RMK AO2 SLP204 T01280061 $
METAR KSEA 210153Z 25007KT 10SM FEW035 SCT060 BKN210 12/06 A3012 RMK AO2 SLP205 T01220056 $
METAR KSEA 210253Z 25007KT 10SM FEW030 SCT055 BKN200 11/06 A3012 RMK AO2 SLP206 T01110061 53002 $
METAR KSEA 210353Z 30005KT 10SM BKN030 BKN180 10/06 A3013 RMK AO2 SLP209 T01000061 $
METAR KSEA 210453Z 35010KT 10SM FEW027 SCT035 BKN180 08/06 A3013 RMK AO2 SLP210 T00830056 $
METAR KSEA 210553Z 04009KT 10SM SCT023 BKN160 OVC250 08/05 A3011 RMK AO2 SLP205 T00780050 10139 20078 58002 $
METAR KSEA 210653Z 02011KT 10SM SCT025 OVC150 08/04 A3011 RMK AO2 SLP204 T00780044 $
METAR KSEA 210753Z 03008KT 10SM SCT019 BKN025 OVC150 07/04 A3010 RMK AO2 SLP200 T00720044 401440072 $
METAR KSEA 210853Z 02009KT 10SM BKN021 BKN029 OVC150 07/03 A3012 RMK AO2 SLP206 T00720033 53001 $
METAR KSEA 210953Z 02011KT 10SM BKN026 BKN035 OVC140 07/03 A3013 RMK AO2 SLP211 T00670028 $
METAR KSEA 211053Z 01011KT 10SM FEW025 BKN036 OVC140 07/03 A3015 RMK AO2 SLP217 T00670028 $
METAR KSEA 211153Z 36012KT 10SM FEW015 BKN027 OVC037 06/03 A3013 RMK AO2 SLP211 70030 T00610033 10078 20061 50006 $