| 11:11 PST |  Overcast Fog And Mist | 0°C / 32°F | -1°C / 30°F | 93% | 1027 mb (30.33 in) | Calm | - | 2SM |
| | KPDX 051911Z 00000KT 2SM BR OVC002 00/M01 A3034 RMK AO2 |
| 10:53 PST |  Mostly Cloudy Fog And Mist | -1°C / 30°F | -1°C / 30°F | 100% | 1028 mb (30.36 in) | Calm | - | 1 1/2SM |
| | KPDX 051853Z 00000KT 1 1/2SM BR BKN002 M01/M01 A3035 RMK AO2 SLP277 T10061011 |
| 10:45 PST |  Mostly Cloudy Fog And Mist | -1°C / 30°F | -1°C / 30°F | 100% | 1028 mb (30.36 in) | Calm | - | 1 1/2SM |
| | KPDX 051845Z 00000KT 1 1/2SM BR BKN001 M01/M01 A3035 RMK AO2 |
| 10:28 PST |  Overcast Fog And Mist | -1°C / 30°F | -1°C / 30°F | 100% | 1028 mb (30.36 in) | NW 7 kph (NW 4.6 mph) | - | 1SM |
| | KPDX 051828Z 30004KT 1SM R10R/3000VP6000FT BR OVC001 M01/M01 A3036 RMK AO2 |
| 10:12 PST |  Overcast Fog And Mist | -1°C / 30°F | -1°C / 30°F | 100% | 1028 mb (30.36 in) | SSW 6 kph (SSW 3.5 mph) | - | 3/4SM |
| | KPDX 051812Z 26003KT 3/4SM R10R/2000V3500FT BR OVC001 M01/M01 A3037 RMK AO2 |
| 09:58 PST |  Overcast Fog And Mist | -1°C / 30°F | -2°C / 28°F | 93% | 1028 mb (30.36 in) | Calm | - | 3/4SM |
| | KPDX 051758Z 00000KT 3/4SM R10R/1200V2000FT BR OVC001 M01/M02 A3037 RMK AO2 |
| 09:53 PST |  Mostly Cloudy Fog And Mist | -1°C / 30°F | -1°C / 30°F | 100% | 1028 mb (30.36 in) | W 6 kph (W 3.5 mph) | - | 1/4SM |
| | KPDX 051753Z 28003KT 1/4SM R10R/1200V2200FT BR BKN001 M01/M01 A3037 RMK AO2 SFC VIS 3/4 SLP283 T10111011 10000 21011 51012 |
| 09:12 PST |  Obscured Fog | -1°C / 30°F | -1°C / 30°F | 100% | 1028 mb (30.36 in) | Calm | - | 1/4SM |
| | KPDX 051712Z 00000KT 1/4SM R10R/1800V2600FT FZFG VV001 M01/M01 A3037 RMK AO2 TWR VIS 1/4 |
| 08:53 PST |  Overcast Fog | -1°C / 30°F | -1°C / 30°F | 100% | 1028 mb (30.36 in) | NW 6 kph (NW 3.5 mph) | - | 1/4SM |
| | KPDX 051653Z 31003KT 1/4SM R10R/1800V2200FT FZFG OVC001 M01/M01 A3036 RMK AO2 SLP281 T10061011 |
| 08:42 PST |  Overcast Fog | -1°C / 30°F | -1°C / 30°F | 100% | 1028 mb (30.36 in) | Calm | - | 1/4SM |
| | KPDX 051642Z 00000KT 1/4SM R10R/1800V2000FT FZFG OVC001 M01/M01 A3036 RMK AO2 |
| 08:23 PST |  Obscured Fog | 0°C / 32°F | -1°C / 30°F | 93% | 1028 mb (30.36 in) | SSW 6 kph (SSW 3.5 mph) | - | 1/4SM |
| | KPDX 051623Z 26003KT 1/4SM R10R/1400V3000FT FG VV001 00/M01 A3035 RMK AO2 |
| 08:10 PST |  Obscured Fog | 0°C / 32°F | -1°C / 30°F | 93% | 1028 mb (30.36 in) | W 6 kph (W 3.5 mph) | - | 1/4SM |
| | KPDX 051610Z 27003KT 1/4SM R10R/1200V1600FT FG VV001 00/M01 A3035 RMK AO2 |
| 07:53 PST |  Obscured Fog | 0°C / 32°F | -1°C / 30°F | 93% | 1028 mb (30.36 in) | SW 6 kph (SW 3.5 mph) | - | 1/4SM |
| | KPDX 051553Z 23003KT 1/4SM R10R/1600V3500FT FG VV001 00/M01 A3035 RMK AO2 SLP275 T00001006 |
| 07:03 PST |  Obscured Fog | 0°C / 32°F | -1°C / 30°F | 93% | 1027 mb (30.33 in) | SSW 7 kph (SSW 4.6 mph) | - | 1/4SM |
| | KPDX 051503Z 26004KT 1/4SM R10R/2000V2400FT FG VV001 00/M01 A3034 RMK AO2 TWR VIS 1/2 |
| 06:53 PST |  Obscured Fog | 0°C / 32°F | -1°C / 30°F | 93% | 1027 mb (30.33 in) | W 6 kph (W 3.5 mph) | - | 1/4SM |
| | KPDX 051453Z 27003KT 1/4SM R10R/1600V2000FT FG VV001 00/M01 A3033 RMK AO2 TWR VIS 1/2 SLP271 T00001006 53001 |
| 06:44 PST |  Obscured Fog | 0°C / 32°F | -1°C / 30°F | 93% | 1027 mb (30.33 in) | SSW 6 kph (SSW 3.5 mph) | - | 1/4SM |
| | KPDX 051444Z 25003KT 1/4SM R10R/1600V1800FT FG VV001 00/M01 A3033 RMK AO2 TWR VIS 1/2 |
| 06:31 PST |  Obscured Fog | 0°C / 32°F | -1°C / 30°F | 93% | 1027 mb (30.33 in) | Calm | - | 1/4SM |
| | KPDX 051431Z 00000KT 1/4SM R10R/1800V3000FT FG VV001 00/M01 A3034 RMK AO2 TWR VIS 1/2 |
| 06:26 PST |  Obscured Fog | 0°C / 32°F | -1°C / 30°F | 93% | 1027 mb (30.33 in) | Calm | - | 1/2SM |
| | KPDX 051426Z 00000KT 1/2SM R10R/2000V2200FT FG VV001 00/M01 A3033 RMK AO2 TWR VIS 3/4 |
| 06:01 PST |  Overcast Fog And Mist | 0°C / 32°F | -1°C / 30°F | 93% | 1027 mb (30.33 in) | SSW 6 kph (SSW 3.5 mph) | - | 3/4SM |
| | KPDX 051401Z 25003KT 3/4SM R10R/4500VP6000FT BR OVC002 00/M01 A3033 RMK AO2 |
| 05:53 PST |  Overcast Fog And Mist | 0°C / 32°F | -1°C / 30°F | 93% | 1027 mb (30.33 in) | Calm | - | 2SM |
| | KPDX 051353Z 00000KT 2SM R10R/5500VP6000FT BR OVC002 00/M01 A3033 RMK AO2 SLP270 T00001006 |
| 04:53 PST |  Overcast Fog And Mist | 0°C / 32°F | -1°C / 30°F | 93% | 1027 mb (30.33 in) | Calm | - | 2SM |
| | KPDX 051253Z 00000KT 2SM BR OVC004 00/M01 A3033 RMK AO2 SFC VIS 3 SLP269 T00001011 |
| 04:37 PST |  Overcast Fog And Mist | 0°C / 32°F | -1°C / 30°F | 93% | 1027 mb (30.33 in) | SSE 6 kph (SSE 3.5 mph) | - | 2SM |
| | KPDX 051237Z 16003KT 2SM BR OVC004 00/M01 A3033 RMK AO2 SFC VIS 3 |
| 03:53 PST |  Overcast Fog And Mist | -1°C / 30°F | -2°C / 28°F | 93% | 1027 mb (30.33 in) | Calm | - | 3/4SM |
| | KPDX 051153Z 00000KT 3/4SM R10R/2400V3000FT BR SCT001 OVC012 M01/M02 A3033 RMK AO2 SLP270 T10111017 10022 21028 51006 |
| 03:48 PST |  Overcast Fog And Mist | -1°C / 30°F | -2°C / 28°F | 93% | 1027 mb (30.33 in) | Calm | - | 3/4SM |
| | KPDX 051148Z 00000KT 3/4SM R10R/2000V3000FT BR SCT001 OVC012 M01/M02 A3033 RMK AO2 |
| 03:32 PST |  Overcast Fog And Mist | -1°C / 30°F | -2°C / 28°F | 93% | 1027 mb (30.33 in) | Calm | - | 3/4SM |
| | KPDX 051132Z 00000KT 3/4SM R10R/1800V2200FT BR SCT001 OVC012 M01/M02 A3033 RMK AO2 |
| 03:17 PST |  Overcast Fog | -2°C / 28°F | -2°C / 28°F | 100% | 1027 mb (30.33 in) | Calm | - | 1/2SM |
| | KPDX 051117Z 00000KT 1/2SM R10R/1200V2800FT FZFG SCT001 OVC012 M02/M02 A3033 RMK AO2 TWR VIS 3/4 |
| 03:14 PST |  Overcast Fog | -2°C / 28°F | -3°C / 27°F | 93% | 1027 mb (30.33 in) | SE 7 kph (SE 4.6 mph) | - | 1/4SM |
| | KPDX 051114Z 12004KT 1/4SM R10R/1200V2400FT FZFG SCT001 OVC012 M02/M03 A3033 RMK AO2 TWR VIS 3/4 |
| 03:07 PST |  Overcast Fog | -3°C / 27°F | -3°C / 27°F | 100% | 1027 mb (30.33 in) | ESE 7 kph (ESE 4.6 mph) | - | 1/4SM |
| | KPDX 051107Z 11004KT 1/4SM R10R/0800V1400FT FZFG SCT001 OVC012 M03/M03 A3033 RMK AO2 TWR VIS 3/4 |
| 02:53 PST |  Mostly Cloudy Fog | -3°C / 27°F | -4°C / 25°F | 93% | 1027 mb (30.33 in) | SE 6 kph (SE 3.5 mph) | - | 1/4SM |
| | KPDX 051053Z 12003KT 1/4SM R10R/1800VP6000FT FZFG SCT001 BKN012 M03/M04 A3033 RMK AO2 TWR VIS 3/4 SLP269 T10281039 |
| 02:43 PST |  Mostly Cloudy Fog And Mist | -2°C / 28°F | -2°C / 28°F | 100% | 1027 mb (30.33 in) | Calm | - | 3/4SM |
| | KPDX 051043Z 00000KT 3/4SM R10R/P6000FT BR SCT001 BKN012 M02/M02 A3033 RMK AO2 TWR VIS 2 1/2 |
| 02:33 PST |  Obscured Fog And Mist | -1°C / 30°F | -1°C / 30°F | 100% | 1027 mb (30.33 in) | E 6 kph (E 3.5 mph) | - | 3/4SM |
| | KPDX 051033Z 10003KT 3/4SM R10R/P6000FT BR VV001 M01/M01 A3033 RMK AO2 |
| 02:31 PST |  Partly Cloudy Fog And Mist | -1°C / 30°F | -2°C / 28°F | 93% | 1027 mb (30.33 in) | E 7 kph (E 4.6 mph) | - | 2 1/2SM |
| | KPDX 051031Z 09004KT 2 1/2SM R10R/2600VP6000FT BR FEW001 M01/M02 A3033 RMK AO2 |
| 01:53 PST |  Partly Cloudy Fog And Mist | -1°C / 30°F | -2°C / 28°F | 93% | 1026 mb (30.3 in) | Calm | - | 4SM |
| | KPDX 050953Z 00000KT 4SM BR FEW010 M01/M02 A3031 RMK AO2 SLP264 T10111022 |
| 00:53 PST |  Clear | -2°C / 28°F | -3°C / 27°F | 93% | 1026 mb (30.3 in) | Calm | - | 7SM |
| | KPDX 050853Z 00000KT 7SM CLR M02/M03 A3029 RMK AO2 SLP257 T10171028 51012 |
| 00:44 PST |  Clear | -2°C / 28°F | -3°C / 27°F | 93% | 1026 mb (30.3 in) | Calm | - | 7SM |
| | KPDX 050844Z 00000KT 7SM CLR M02/M03 A3030 RMK AO2 |
| 00:36 PST |  Clear Fog And Mist | -2°C / 28°F | -3°C / 27°F | 93% | 1026 mb (30.3 in) | Calm | - | 2SM |
| | KPDX 050836Z 00000KT 2SM BR CLR M02/M03 A3029 RMK AO2 |