National Weather Service
|National Operational Hydrologic
Remote Sensing Center
National Snow Analyses
A surface low over Lake Erie yesterday morning moved through the Northeast yesterday, and a weak secondary low developed in southern Quebec. Up to 10 inches of snow fell in northern and central Maine. To the southwest where warmer temperatures were present, up to an inch of rain fell in northern Vermont and the Adirondacks.
The snowpack across the Great Lakes through the Northeast continues to be warm and slowly melt. Melting also occurred in the northern Plains despite a cooler snowpack. In the West, little snow can be found at lower elevations; higher-elevation snow is warm and slowly melting.
The secondary surface low in southern Quebec will move northeastward out to sea by tonight, and little additional precipitation is expected with this feature.
A fast-moving midlevel trough off the Northwest coast this morning will move quickly across the northern U.S. during the rest of the week. Around 1/2 foot of snowfall is probable at higher elevations in the northern Rockies today, and light snowfall is probable in the northern Plains tonight and around Lake Superior tomorrow. The system is expected to be warm enough on Saturday to bring around 1/2 inch of rainfall to the Northeast.
Behind this disturbance will be a larger, deeper trough which will move slowly through the West this weekend. Around 1/2 foot of higher-elevation snowfall is expected in southern Colorado and northern New Mexico this weekend.
Moderately-strong onshore flow into the Northwest will develop on Sunday and continue through midweek. A rain/snow mix is expected at higher elevations and rain is likely at middle and lower elevations.
Note: these data are unofficial and provisional.