| 18:55 PST |  Mostly Cloudy | -3°C / 27°F | -6°C / 21°F | 80% | 1021 mb (30.15 in) | Calm | - | 10SM |
| | KEAT 050255Z AUTO 00000KT 10SM FEW075 BKN095 BKN120 M03/M06 A3014 RMK AO2 SLP222 T10281056 53009 |
| 17:55 PST |  Overcast | -2°C / 28°F | -6°C / 21°F | 74% | 1020 mb (30.12 in) | Calm | - | 10SM |
| | KEAT 050155Z AUTO 00000KT 10SM OVC060 M02/M06 A3013 RMK AO2 SLP218 T10221056 |
| 16:55 PST |  Overcast | -2°C / 28°F | -6°C / 21°F | 74% | 1020 mb (30.12 in) | NE 6 kph (NE 3.5 mph) | - | 10SM |
| | KEAT 050055Z AUTO 04003KT 10SM OVC090 M02/M06 A3012 RMK AO2 SLP216 T10221056 |
| 15:55 PST |  Partly Cloudy | -2°C / 28°F | -6°C / 21°F | 74% | 1020 mb (30.12 in) | SSW 11 kph (SSW 6.9 mph) | - | 10SM |
| | KEAT 042355Z AUTO 25006KT 10SM FEW085 M02/M06 A3011 RMK AO2 SLP213 T10171056 11006 21028 55001 |
| 14:55 PST |  Partly Cloudy | -1°C / 30°F | -6°C / 21°F | 69% | 1019 mb (30.09 in) | SSW 7 kph (SSW 4.6 mph) | - | 10SM |
| | KEAT 042255Z AUTO 26004KT 10SM FEW095 M01/M06 A3010 RMK AO2 SLP207 T10111061 |
| 13:55 PST |  Clear | -1°C / 30°F | -6°C / 21°F | 69% | 1019 mb (30.09 in) | SSW 9 kph (SSW 5.8 mph) | - | 10SM |
| | KEAT 042155Z AUTO 25005KT 10SM CLR M01/M06 A3010 RMK AO2 SLP208 T10061056 |
| 12:55 PST |  Clear | -1°C / 30°F | -6°C / 21°F | 69% | 1020 mb (30.12 in) | W 7 kph (W 4.6 mph) | - | 10SM |
| | KEAT 042055Z AUTO 27004KT 10SM CLR M01/M06 A3012 RMK AO2 SLP214 T10111061 58019 |
| 11:55 PST |  Clear | -2°C / 28°F | -6°C / 21°F | 74% | 1021 mb (30.15 in) | NW 7 kph (NW 4.6 mph) | - | 10SM |
| | KEAT 041955Z AUTO 31004KT 10SM CLR M02/M06 A3014 RMK AO2 SLP221 T10171061 |
| 11:09 PST |  Partly Cloudy | -2°C / 28°F | -6°C / 21°F | 74% | 1021 mb (30.15 in) | NNW 11 kph (NNW 6.9 mph) | - | 10SM |
| | KEAT 041909Z AUTO 33006KT 10SM SCT016 M02/M06 A3015 RMK AO2 |
| 10:55 PST |  Mostly Cloudy | -2°C / 28°F | -6°C / 21°F | 74% | 1021 mb (30.15 in) | NW 13 kph (NW 8.1 mph) | - | 10SM |
| | KEAT 041855Z AUTO 30007KT 10SM BKN016 M02/M06 A3016 RMK AO2 SLP229 T10221061 |
| 09:55 PST |  Mostly Cloudy | -3°C / 27°F | -7°C / 19°F | 74% | 1022 mb (30.18 in) | W 7 kph (W 4.6 mph) | - | 10SM |
| | KEAT 041755Z AUTO 27004KT 10SM BKN018 M03/M07 A3017 RMK AO2 SLP234 T10281067 11028 21044 58001 |
| 09:22 PST |  Partly Cloudy | -4°C / 25°F | -7°C / 19°F | 80% | 1022 mb (30.18 in) | SSW 15 kph (SSW 9.2 mph) | - | 10SM |
| | KEAT 041722Z AUTO 25008KT 10SM SCT022 M04/M07 A3018 RMK AO2 |
| 08:55 PST |  Overcast | -4°C / 25°F | -7°C / 19°F | 80% | 1022 mb (30.18 in) | SSW 9 kph (SSW 5.8 mph) | - | 10SM |
| | KEAT 041655Z AUTO 24005KT 10SM OVC022 M04/M07 A3018 RMK AO2 SLP236 T10391067 |
| 07:55 PST |  Overcast | -4°C / 25°F | -7°C / 19°F | 80% | 1022 mb (30.18 in) | SSW 9 kph (SSW 5.8 mph) | - | 10SM |
| | KEAT 041555Z AUTO 24005KT 10SM OVC015 M04/M07 A3018 RMK AO2 SLP235 T10391067 |
| 06:55 PST |  Overcast | -4°C / 25°F | -6°C / 21°F | 86% | 1022 mb (30.18 in) | S 6 kph (S 3.5 mph) | - | 10SM |
| | KEAT 041455Z AUTO 17003KT 10SM OVC015 M04/M06 A3017 RMK AO2 SLP232 T10391061 53002 |
| 06:30 PST |  Overcast | -4°C / 25°F | -6°C / 21°F | 86% | 1021 mb (30.15 in) | Calm | - | 10SM |
| | KEAT 041430Z AUTO 00000KT 10SM OVC015 M04/M06 A3016 RMK AO2 |
| 05:55 PST |  Overcast | -4°C / 25°F | -6°C / 21°F | 86% | 1021 mb (30.15 in) | Calm | - | 10SM |
| | KEAT 041355Z AUTO 00000KT 10SM OVC013 M04/M06 A3015 RMK AO2 SLP226 T10391061 |
| 04:55 PST |  Overcast | -4°C / 25°F | -6°C / 21°F | 86% | 1021 mb (30.15 in) | Calm | - | 10SM |
| | KEAT 041255Z AUTO 00000KT 10SM OVC013 M04/M06 A3015 RMK AO2 SLP225 T10441061 |
| 03:55 PST |  Overcast | -4°C / 25°F | -6°C / 21°F | 86% | 1021 mb (30.15 in) | Calm | - | 10SM |
| | KEAT 041155Z AUTO 00000KT 10SM OVC013 M04/M06 A3016 RMK AO2 SLP229 T10391061 11033 21056 58014 |
| 02:55 PST |  Overcast | -3°C / 27°F | -6°C / 21°F | 80% | 1022 mb (30.18 in) | Calm | - | 10SM |
| | KEAT 041055Z AUTO 00000KT 10SM OVC013 M03/M06 A3019 RMK AO2 SLP237 T10331061 |
| 01:55 PST |  Overcast | -4°C / 25°F | -6°C / 21°F | 86% | 1022 mb (30.18 in) | ESE 7 kph (ESE 4.6 mph) | - | 10SM |
| | KEAT 040955Z AUTO 11004KT 10SM OVC013 M04/M06 A3018 RMK AO2 SLP236 T10391056 |
| 01:07 PST |  Mostly Cloudy | -4°C / 25°F | -6°C / 21°F | 86% | 1022 mb (30.18 in) | E 7 kph (E 4.6 mph) | - | 10SM |
| | KEAT 040907Z AUTO 10004KT 10SM BKN013 M04/M06 A3019 RMK AO2 |
| 00:55 PST |  Partly Cloudy | -5°C / 23°F | -7°C / 19°F | 86% | 1023 mb (30.21 in) | SE 6 kph (SE 3.5 mph) | - | 10SM |
| | KEAT 040855Z AUTO 12003KT 10SM FEW013 M05/M07 A3020 RMK AO2 SLP244 T10501067 58020 |