Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Overview

An early season snow event produced significant snow amounts for northeast North Dakota into northwest Minnesota for early October. The heaviest snow fell in Roseau county where around a foot of heavy wet snow has been reported as of 3 pm Thursday October 4. This heavy wet snow has also produced numerous power outages across this area.

These snow amounts appear to be record amounts for this early in the season for many areas. The previous record snowfall for October 4 or earlier at the NWS in Grand Forks was 2 inches on October 2, 1950. The NWS at Grand Forks reported 3.5 inches of snow with this storm on October 4, 2012. While records from around the area indicate that the October 2, 1950 storm produced about 2-5 inches around the region with localized higher amounts, with Leeds, ND receiving 7.0 inches on October 2, 1950, and Hallock 4.5 inches.

Storm Reports

Storm Reports

...PRELIMINARY SNOWFALL REPORTS FROM THE AREA...


ESTIMATED MAXIMUM SNOWFALL ACCUMULATIONS AS OF 3PM:


NORTH DAKOTA                    MAX DEPTH


    PEMBINA (PEMBINA CO.)        4 INCHES


    LANKIN (WALSH CO.)           3 INCHES

    PARK RIVER (WALSH CO.)       2 INCHES


    MICHIGAN (NELSON CO.)      3.3 INCHES


    GRAND FORKS (GF CO.)       3.5 INCHES


    2SE MAYVILLE (TRAILL CO.)    3 INCHES


    FARGO (CASS CO.)             1 INCH (VARIABLE 1-2)


MINNESOTA


    HALLOCK (KITTSON CO.)        4 INCHES

    KARSLSTAD (KITTSON CO.)      6 INCHES


    2W BADGER (ROSEAU CO.)      12 INCHES

   10NNW BADGER (ROSEAU CO.)    14 INCHES

    ROSEAU (ROSEAU CO.)          7 INCHES


    STEPHEN (MARSHALL CO.)       5 INCHES

    MIDDLE RIVER (MARSHALL CO.)  8 INCHES (VARIABLE 4-8)

    GRYGLA (MARSHALL CO.)        3 INCHES


    THIEF RIVER FALLS            4 INCHES (VARIABLE 3-6)

         (PENNINGTON CO.)


    RED LAKE FALLS               4 INCHES

         (RED LAKE CO.)


    3S ANGUS (POLK CO.)          8 INCHES (VARIABLE 4-8)

    3SE CROOKSTON (POLK CO.)     6 INCHES


    ADA (NORMAN CO.)             4 INCHES (VARIABLE 3-4)


    MOORHEAD (CLAY CO.)        1.4 INCHES (AS OF 7AM)

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Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

Summary of the October 4th, 2012 Early Season Snowfall