CB RADIO REPORT
HOME - BUY A CB RADIO - MENU
National Weather Service
Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
311 AM EST Thu Dec 11 2025
Valid 12Z Sun Dec 14 2025 - 12Z Thu Dec 18 2025
...Hazardous wind chills continue for portions of the Northern Plains and Upper Midwest Sunday morning...
...Further atmospheric rivers to impact the Pacific Northwest for much of next week...
...Overview...
Broad ridging over the West this weekend expands across the lower 48, spreading above normal temperatures before flattening out through the middle of the week into zonal flow. Further low pressure development over the Gulf of Alaska directs atmospheric rivers into the Pacific Northwest for much of next week with renewed heavy rain and mountain snow through the Northern Continental Divide. Low pressure crossing the Northeast Sunday will have following lake effect snow into Monday with a series of shortwave trough passages then for the northern tier east of the Rockies given the zonal flow.
...Guidance/Predictability Assessment...
The most pronounced feature of next week is the low shifting from the St. Lawrence across the Northeast Sunday and Atlantic Canada Monday. Decent global deterministic guidance agreement persists with this feature. A southern stream shortwave over the Four Corners states Monday and its vector from there is the next feature of note. The 12Z and now 00Z ECMWF are closest to ECAIFS solutions that are slower and farther south into north Mexico. The 00Z CMC remains the second slowest which was part of the reason to prefer the EC/CMC through much of the forecast cycle. However, the 00Z CMC is quicker with a potent shortwave trough into the Pacific Northwest Tuesday than all other global deterministics, so some caution should be used there. Modifications were made to the QPF from the 01Z NBM across the board with the 12Z ECMWF/CMC with targeted inclusions of output from the 18Z ECAIFS which led to less PacNW QPF midweek due to less influence in the more meridional GFS. However, this blend increased QPF over the lower MS Valley to the TN Valley midweek.
...Weather/Hazards Highlights...
Snow is expected over the Northeast urban corridor Sunday as low pressure shifts east to Atlantic Canada. Lake effect snow follows this system into Monday with clipper like systems bringing brief rounds of snow then for much of the remainder over the week over the Norther Tier.
Zonal jet dynamics south of Gulf of Alaska low pressure directs tropically-sourced moisture into the Pacific Northwest starting Monday. A Day 5 Marginal Risk ERO has been introduced. The PW anomaly is nearly 4 sigma above normal, though the low level inflow is much more SSWly, not orthogonal to terrain during the highest moisture influx which should limit duration of the heaviest rainfall. That said, multiple days of continued rain next week could lead to additional significant impacts given the moderate to major flooding ongoing at present.
High pressure keeps much of the central portions of the country dry for the first half of next week, though Gulf moisture is drawn back up in return flow starting Thursday.
Bitterly cold Canadian air shifts east from the Midwest/Mid-South Sunday and offshore early next week with temperatures 25 to 35 degrees below normal into Monday. However, upper level high pressure expands over the country from the West allowing temperatures to reach 15F to 25F above seasonal average over the West early next week with above normal temperatures for much of the Lower 48 for midweek creating a December thaw.
Jackson