Skip Navigation Links 
NOAA logo - Click to go to the NOAA homepage National Weather Service   NWS logo - Click to go to the NWS homepage
The Weather Prediction Center



Follow the Weather Prediction Center on Facebook Follow the Weather Prediction Center on Twitter
NCEP Quarterly Newsletter
WPC Home
Analyses and Forecasts
   National High & Low
   WPC Discussions
   Surface Analysis
   Days ½-2½ CONUS
   Days 3-7 CONUS
   Days 4-8 Alaska
   Flood Outlook
   Winter Weather
   Storm Summaries
   Heat Index
   Tropical Products
   Daily Weather Map
   GIS Products
Current Watches/

Satellite and Radar Imagery
  GOES-East Satellite
  GOES-West Satellite
  National Radar
Product Archive
WPC Verification
   Medium Range
   Model Diagnostics
   Event Reviews
   Winter Weather
International Desks
Development and Training
WPC Overview
   About the WPC
   WPC History
   Other Sites
Meteorological Calculators
Contact Us
   About Our Site is the U.S. Government's official web portal to all federal, state, and local government web resources and services.
Short Range Public Discussion
(Latest Discussion - Issued 0800Z Dec 02, 2023)
Version Selection
Versions back from latest:  0   1   2   3   4   5   6   7   8   9   10   
Abbreviations and acronyms used in this product
Geographic Boundaries -  Map 1: Color  Black/White       Map 2: Color  Black/White

Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 259 AM EST Sat Dec 02 2023 Valid 12Z Sat Dec 02 2023 - 12Z Mon Dec 04 2023 ...A multi-day atmospheric river event will impact the Northwest with significant mountain snowfall and heavy rain this weekend... ...Unsettled weather forecast across the eastern third of the country with heavy rain potential along the Gulf Coast and Southeast; wintry weather is expected from parts of the Midwest and Great Lakes to northern New England... ...Generally milder than normal temperatures expected for across most of the Lower 48... The first weekend of December is shaping up to be an active one in the West thanks to a series of atmospheric rivers directing copious amounts of Pacific moisture into the Pacific Northwest and the Rockies. The next storm in a series of storm systems arrived this morning, inflicting more heavy mountain snow in the Olympics and Cascades that will continue throughout the day. Meanwhile, the same moisture source will push inland towards the Rockies Saturday and into Saturday night. As a result, heavy mountain snow is on tap from eastern Oregon and the northern Rockies on south to the Wasatch Range in Utah and the Colorado Rockies. By Sunday, the next storm system will track farther north towards British Columbia. This storm system's warm front lifts north through western Washington and Oregon on Sunday, forcing snow levels to rise sharply and force most of the Cascades and Olympics to switch over to heavy rain. This combination of heavy rain atop a deep snowpack may lead to minor and moderate river flooding, as well as possible flash flooding, into early next week. WPC has issued a Slight Risk for Excessive Rainfall on Sunday for portions of western Oregon, while a Marginal Risk extends north from the far northern California coast to Washington's Cascade and Olympic Ranges. As much as 5 to 10 inches of rainfall are forecast along the coast of Oregon, while as much as several feet of snow accumulate in the higher terrain and passes of the Cascades. The northern and central Rockies can also expect heavy snow with some areas seeing 1-3 feet through the weekend. The Winter Storm Severity Index (WSSI) shows Major Impacts are possible in the highest elevations of the Pacific Northwest and the Rockies, likely causing hazardous to even impossible travel conditions in these impacted areas. Farther east, a pair of storm systems will lead to wet and wintry weather across portions the eastern third of the CONUS. Along the Gulf Coast, low pressure tapping into rich Gulf of Mexico moisture is set to ignite strong-to-severe thunderstorms from southern Louisiana to the Florida Panhandle. There are Slight Risks for both severe storms and Excessive Rainfall in portions of these areas today with severe storms more likely to contain damaging wind gusts and/or tornadoes. Farther north, showers will envelope the Mid-Atlantic and both the Ohio and Tennessee Valleys Saturday afternoon and into Saturday night. By Sunday morning, a new storm system tracking into the Great Lakes will be responsible for periods of light rain and snow from the Midwest to the northern Great Lakes. Farther east, another developing area of low pressure along the Northeast coast looks to form and produce periods of rain along the I-95 corridor during the day on Sunday. In northern New England, precipitation will fall in the form of snow Sunday afternoon and into Sunday night. Snow looks to fall heavily at times in the Adirondacks, the Green and White mountains, and into northern Maine. Latest WPC probabilistic forecasts shows a high chance (greater than 70%) for snowfall totals over 6 inches through Sunday night from central New Hampshire to both northern and central Maine. The latest WSSI shows Moderate Impacts from east-central New Hampshire into central Maine, indicating snowfall here will be capable of causing disruptions to daily life. This includes hazardous driving conditions and potential closures and travel delays. Temperature-wise, much of the Lower 48 will witness seasonal to milder than normal conditions, particularly east of the Rockies. The coolest temperatures versus normal will be experienced in the Rockies. Back in the Southeast, record warm morning lows are forecast from South Florida to the Mid-Atlantic coast on Sunday. Mullinax Graphics available at