| 09:56 CST |  Overcast | N/A | N/A | N/A | 1005 mb (29.68 in) | Calm | - | 10SM |
| | KSYN 261556Z AUTO 00000KT 10SM OVC075 A2967 RMK AO2 |
| 09:35 CST |  Overcast | N/A | N/A | N/A | 1005 mb (29.68 in) | Calm | - | 10SM |
| | KSYN 261535Z AUTO 00000KT 10SM OVC075 A2967 RMK AO2 |
| 09:16 CST |  Mostly Cloudy | N/A | N/A | N/A | 1005 mb (29.68 in) | Calm | - | 10SM |
| | KSYN 261516Z AUTO 00000KT 10SM BKN075 A2967 RMK AO2 |
| 08:56 CST |  Mostly Cloudy Fog And Mist | -14°C / 7°F | -16°C / 3°F | 85% | 1005 mb (29.68 in) | Calm | - | 4SM |
| | KSYN 261456Z AUTO 00000KT 4SM BR BKN075 M14/M16 A2967 RMK AO2 T11401158 |
| 08:36 CST |  Clear | -13°C / 9°F | -15°C / 5°F | 85% | 1005 mb (29.68 in) | Calm | - | 10SM |
| | KSYN 261436Z AUTO 00000KT 10SM CLR M13/M15 A2967 RMK AO2 T11321150 |
| 08:15 CST |  Clear | -13°C / 9°F | -15°C / 5°F | 85% | 1004 mb (29.65 in) | Calm | - | 10SM |
| | KSYN 261415Z AUTO 00000KT 10SM CLR M13/M15 A2966 RMK AO2 T11351153 |
| 07:56 CST |  Partly Cloudy | -12°C / 10°F | -14°C / 7°F | 85% | 1004 mb (29.65 in) | Calm | - | 10SM |
| | KSYN 261356Z AUTO 00000KT 10SM SCT080 M12/M14 A2966 RMK AO2 T11211137 |
| 07:35 CST |  Partly Cloudy | -14°C / 7°F | -16°C / 3°F | 85% | 1004 mb (29.65 in) | Calm | - | 10SM |
| | KSYN 261335Z AUTO 00000KT 10SM SCT080 M14/M16 A2966 RMK AO2 T11411158 |
| 07:15 CST |  Partly Cloudy | -12°C / 10°F | -14°C / 7°F | 85% | 1004 mb (29.65 in) | ENE 6 kph (ENE 3.5 mph) | - | 10SM |
| | KSYN 261315Z AUTO 07003KT 10SM SCT080 M12/M14 A2965 RMK AO2 T11211138 |
| 06:56 CST |  Clear | -13°C / 9°F | -14°C / 7°F | 92% | 1004 mb (29.65 in) | E 6 kph (E 3.5 mph) | - | 10SM |
| | KSYN 261256Z AUTO 09003KT 10SM CLR M13/M14 A2964 RMK AO2 T11261141 |
| 06:36 CST |  Clear | -11°C / 12°F | -13°C / 9°F | 85% | 1004 mb (29.65 in) | E 6 kph (E 3.5 mph) | - | 10SM |
| | KSYN 261236Z AUTO 09003KT 10SM CLR M11/M13 A2964 RMK AO2 T11151135 |
| 06:16 CST |  Clear | -9°C / 16°F | -12°C / 10°F | 79% | 1003 mb (29.62 in) | E 6 kph (E 3.5 mph) | - | 10SM |
| | KSYN 261216Z AUTO 10003KT 10SM CLR M09/M12 A2962 RMK AO2 T10951118 |
| 05:56 CST |  Clear | -10°C / 14°F | -12°C / 10°F | 85% | 1003 mb (29.62 in) | E 6 kph (E 3.5 mph) | - | 10SM |
| | KSYN 261156Z AUTO 10003KT 10SM CLR M10/M12 A2962 RMK AO2 70054 T10961121 11060 21100 |
| 05:35 CST |  Partly Cloudy | -9°C / 16°F | -12°C / 10°F | 79% | 1003 mb (29.62 in) | E 6 kph (E 3.5 mph) | - | 10SM |
| | KSYN 261135Z AUTO 09003KT 10SM SCT110 M09/M12 A2962 RMK AO2 T10931121 |
| 05:16 CST |  Clear | -9°C / 16°F | -12°C / 10°F | 79% | 1003 mb (29.62 in) | ESE 7 kph (ESE 4.6 mph) | - | 10SM |
| | KSYN 261116Z AUTO 11004KT 10SM CLR M09/M12 A2961 RMK AO2 T10911118 |
| 04:56 CST |  Partly Cloudy | -8°C / 18°F | -11°C / 12°F | 79% | 1002 mb (29.59 in) | Calm | - | 10SM |
| | KSYN 261056Z AUTO 00000KT 10SM SCT044 M08/M11 A2960 RMK AO2 T10831115 |
| 04:36 CST |  Overcast | -8°C / 18°F | -11°C / 12°F | 79% | 1002 mb (29.59 in) | SE 7 kph (SE 4.6 mph) | - | 10SM |
| | KSYN 261036Z AUTO 12004KT 10SM OVC044 M08/M11 A2959 RMK AO2 T10801113 |
| 04:16 CST |  Overcast | -8°C / 18°F | -11°C / 12°F | 79% | 1002 mb (29.59 in) | SE 7 kph (SE 4.6 mph) | - | 10SM |
| | KSYN 261016Z AUTO 13004KT 10SM SCT019 BKN042 OVC110 M08/M11 A2959 RMK AO2 T10791112 |
| 03:55 CST |  Overcast | -8°C / 18°F | -11°C / 12°F | 79% | 1002 mb (29.59 in) | SSE 9 kph (SSE 5.8 mph) | - | 10SM |
| | KSYN 260955Z AUTO 15005KT 10SM BKN021 OVC026 M08/M11 A2958 RMK AO2 T10781112 |
| 03:36 CST |  Overcast | -8°C / 18°F | -11°C / 12°F | 79% | 1002 mb (29.59 in) | SSE 11 kph (SSE 6.9 mph) | - | 10SM |
| | KSYN 260936Z AUTO 15006KT 10SM OVC021 M08/M11 A2958 RMK AO2 T10771112 |
| 03:15 CST |  Overcast Light Snow | -8°C / 18°F | -11°C / 12°F | 79% | 1001 mb (29.56 in) | SSE 13 kph (SSE 8.1 mph) | - | 5SM |
| | KSYN 260915Z AUTO 16007KT 5SM -SN OVC019 M08/M11 A2957 RMK AO2 T10761109 |
| 02:56 CST |  Overcast | -7°C / 19°F | -10°C / 14°F | 79% | 1001 mb (29.56 in) | SSE 9 kph (SSE 5.8 mph) | - | 10SM |
| | KSYN 260856Z AUTO 16005KT 10SM BKN020 OVC040 M07/M10 A2957 RMK AO2 T10731105 |
| 02:36 CST |  Overcast | -7°C / 19°F | -11°C / 12°F | 73% | 1001 mb (29.56 in) | SSE 9 kph (SSE 5.8 mph) | - | 10SM |
| | KSYN 260836Z AUTO 15005KT 10SM BKN038 OVC050 M07/M11 A2956 RMK AO2 T10721109 |
| 02:16 CST |  Overcast | -7°C / 19°F | -10°C / 14°F | 79% | 1001 mb (29.56 in) | S 11 kph (S 6.9 mph) | - | 10SM |
| | KSYN 260816Z AUTO 17006KT 10SM SCT014 SCT038 OVC050 M07/M10 A2955 RMK AO2 T10721104 |
| 01:56 CST |  Overcast Light Snow | -7°C / 19°F | -10°C / 14°F | 79% | 1000 mb (29.53 in) | SSE 9 kph (SSE 5.8 mph) | - | 3SM |
| | KSYN 260756Z AUTO 15005KT 3SM -SN BKN014 OVC038 M07/M10 A2954 RMK AO2 T10731105 |
| 01:36 CST |  Overcast Light Snow | -7°C / 19°F | -10°C / 14°F | 79% | 1000 mb (29.53 in) | SSE 13 kph (SSE 8.1 mph) | - | 4SM |
| | KSYN 260736Z AUTO 16007KT 4SM -SN OVC038 M07/M10 A2953 RMK AO2 T10701103 |
| 01:15 CST |  Overcast Light Snow | -7°C / 19°F | -10°C / 14°F | 79% | 1000 mb (29.53 in) | S 11 kph (S 6.9 mph) | - | 5SM |
| | KSYN 260715Z AUTO 18006KT 5SM -SN OVC036 M07/M10 A2952 RMK AO2 T10681100 |
| 00:56 CST |  Overcast Light Snow | -7°C / 19°F | -11°C / 12°F | 73% | 999 mb (29.5 in) | S 17 kph (S 10.4 mph) | - | 5SM |
| | KSYN 260656Z AUTO 17009KT 5SM -SN OVC036 M07/M11 A2951 RMK AO2 T10671106 |
| 00:36 CST |  Overcast Light Snow | -6°C / 21°F | -11°C / 12°F | 68% | 999 mb (29.5 in) | SSE 20 kph (SSE 12.7 mph) | - | 10SM |
| | KSYN 260636Z AUTO 16011G14KT 10SM -SN OVC034 M06/M11 A2950 RMK AO2 T10651108 |
| 00:15 CST |  Overcast Light Snow | -6°C / 21°F | -10°C / 14°F | 74% | 999 mb (29.5 in) | S 17 kph (S 10.4 mph) | - | 3SM |
| | KSYN 260615Z AUTO 17009KT 3SM -SN OVC034 M06/M10 A2949 RMK AO2 T10651101 |