Rain, sleet, snow? Be in the know. For 24/7 weather forecasts, watches and warnings, follow NOAA's National Weather Servce here at @NWS and @NWSWPC -- and online at https://t.co/83F2guqEts Happy Holidays and Happy New Year!

A multi-day heavy lake effect snow event is expected downwind of Lakes Erie and Ontario through New Year's Day. There is increasing confidence in snow squalls causing bursts of snow & gusty winds on New Year's Eve. Visit https://t.co/VyWINDk3xP for the latest.

Rain associated with an anomalous low pressure system from the tropical latitudes is forecast to bring the threat of flash flooding for southern California on New Year's Eve into New Year's Day

Arctic air will dominate the eastern two-thirds of the country including Florida followed by a quick warm-up across the Northern and Central Plains amid a mild and tranquil Intermountain West

Heavy lake-effect snow expected to linger across the Great Lakes as a big cyclone pivots away into eastern Canada

Arctic air will surge into the eastern two-thirds of the country including Florida followed by a quick warm-up across the northern and central Plains

Potent winter storm reaching peak intensity this morning from the upper Midwest to the Great Lakes with freezing rain across interior New England

The central U.S. is waking up to much colder temperatures compared to this time yesterday. In fact, up to ‼️ 50 degrees ‼️ colder thanks to a very strong cold front crossing through the Gulf Coast and East Coast today. Strong gusty winds will also accompany this front. 🌬️🥶

A powerful winter storm will continue to deepen today as it lifts into southeastern Canada. Expect blizzard conditions with considerable blowing and drifting snow, especially in and near the lake effect snow belts, along with dangerous wind chills.

With a high risk of excessive rainfall issued across southern California on Wednesday, do you know what that means? Excessive Rainfall Outlook High Risk Days indicate potential for extreme impacts from flash flooding. These days correspond to about two out of every five

Unseasonable warmth is forecast across a large portion of the Lower 48 this week. High temperatures will soar to 30 to 40 degrees above normal, with some areas as much as 50 degrees above normal. Dozens of daily high temperature (and warm low temperature) records could be broken

Another #AtmosphericRiver is taking aim at the West Coast, this time for California. In this imagery, @NOAA's #GOESWest (#GOES18) is tracking the moisture that is streaming in from the Pacific with its #WaterVapor channel. #HighWind Warnings, #Flood Watches & #WinterStorm

Are you traveling for the holidays? Make sure you monitor the forecast at home, at your destination, and along your route! This map shows all the @NWS offices in the country (click on a location to go directly to their website): https://t.co/TW0nXW3FYx

It's been quite a year for NOAA's environmental satellites! Here's our recap from our @NOAASatellites team:

Good afternoon!!!! Strong #SoCal storm over the Christmas holiday. - Rain Tue-Sat * Heaviest Tue Night-Wed - FLOOD WATCH Tue Afternoon-Wed Evening * All 4 counties * Debris flows and widespread urban flooding possible - Gusty SE winds Tue-Wed #CAwx

Key Messages for the Atmospheric River event that will continue to affect more and more of California have been updated. Please stay up-to-date on your forecast at https://t.co/pGx1JRZLBI and stay safe!

Rain/freezing rain possible over the Pennsylvania and Central Appalachians

Heavy snow downwind from Lake Ontario and New England

There is a Moderate Risk of excessive rainfall over parts of Northern California on Monday

There is a Slight Risk of excessive rainfall over parts of the Pacific Northwest on Friday