A ground stop briefly held flights bound for O'Hare on Sunday as storms reduced visibility and caused FAA-reported departure delays averaging about 45 minutes.

Cold Weather and Coastal Flood Advisories are in effect in the Bay Area, with risks of carbon monoxide poisoning, flooding, and urging residents to prepare for incoming rain and tides.

San Diego forecast includes Santa Ana winds up to 60 mph, warming trend to 70°F, followed by a shift to cloudier, wetter conditions with rain chances increasing to 90% by New Year's Day.

The NWS forecasts dense fog, frost, and persistent rain in Sacramento, with temperatures ranging in the mid-50s and chances of rain increasing mid-week.

The National Weather Service warns of hazardous conditions in the Twin Cities due to lingering effects of a snowstorm, with continued blowing snow and slippery roads.

Chicago faces cold winds and light snow, with gusts up to 45 mph and temperatures around 24 degrees. Flurries and a chance of snow persist throughout the week.

Shift to trade winds in Honolulu is expected, aiding in dispersing New Year's firework smoke. A weak frontal band might increase showers on Friday, with cooler weather on the weekend. High Surf Advisory issued due to a large northwest swell.

Las Vegas expects continued gusty winds and changing weather, including a potential for New Year's Eve rain, while aviation forecasts indicate varying wind patterns affecting travel.

Phoenix, Arizona will have mostly sunny skies and a high near 74 degrees today, with possible gusts up to 20 mph. The weather will stay consistent into Wednesday, followed by a 60% chance of showers Wednesday night.

Houston is set to experience a sharp temperature drop from the lower-80s to the mid-50s, with windy conditions and a brief cold snap before temperatures rise again later in the week.

Los Angeles weather is shifting from sunny to cloudy with a chance of rain increasing throughout the week, reaching a high probability of precipitation by New Year's Day.

San Antonio's weather features mostly cloudy skies with a cool peak of 49 degrees, brisk north winds, and possible gusts up to 30 mph. Conditions will improve throughout the week, becoming warmer and sunnier.

Michigan faces severe winter weather with high winds and icy conditions, causing widespread power outages and travel disruptions, with efforts underway to restore electricity and maintain transportation safety.