NATIONAL WEATHER SUMMARY

DECEMBER 2016

1-10: A trough of low pressure generated active weather across the Four Corners and the southern Plains on Friday, while rain and mountains snow affected the Northwest. A trough of low pressure moved east southeastward over northwest Mexico. This system
drew moisture from the Gulf of Mexico, which lead to the development of rain and thunderstorms across the southern Plains and the western Gulf Coast. Coastal flood advisories were issued in southeast Texas and southwest Louisiana. Just to the west, high
pressure generated strong offshore winds across central and southern California. High wind warnings and wind advisories were issued for a large span of the state. Tustin, Calif., recorded wind gusts of 65 mph. Corona, Calif., recorded wind gusts of 61
mph. Meanwhile, a Pacific frontal system approached the Northwest. As a result, light to moderate rain and high elevation snow developed from Washington to Oregon. Back east, a mixture of rain and snow continued to fall in portions of the upper Midwest,
the northern Mid-Atlantic and New England.

A low pressure system generated strong thunderstorms across the Deep South on Monday, while a separate system brought wintry weather to the northern Plains. An area of low pressure strengthened as it moved east northeastward across the Gulf Coast. This
system ushered heavy rain and strong to severe thunderstorms over many states stretching from the southern Plains to the Southeast. To the north, a weak disturbance produced a light mixture of rain and snow from the upper Midwest to New England.
Meanwhile, a stronger area of low pressure generated moderate to heavy precipitation and strong winds from the upper Intermountain West to the upper Mississippi Valley. A frigid air mass also surged across the Northwest and the upper Intermountain West.
Stanley, Idaho, recorded a morning low of -7 degrees. Baker, Ore., recorded a morning low of 3 degrees. Additionally, an onshore flow from the Pacific generated light to moderate rain and mountain snow from northwest Oregon to western Washington.

A mixture of rain, freezing rain and snow impacted portions of the Northwest on Friday, while lake effect snow continued across the upper Midwest and the Northeast. A Pacific frontal system began to move onshore over the Pacific Northwest and northern
California. A plume of moisture interacted with this system, which lead to the development of moderate rain from northwest California to western Washington. Further inland, a mixture of freezing rain and snow affected the higher elevations of the
Olympics, the Cascades, the northern Great Basin and the northern Rockies. Most areas across the Southwest experienced dry conditions on Friday. Los Angeles, Calif., recorded a midday high of 63 degrees. Meanwhile, a frigid air mass continued to stream
across the Great Lakes. This interaction kept lake effect snow in the picture for parts of the upper Midwest and the Northeast. Lake effect snow warnings were issued in northeast Ohio, northwest Pennsylvania and portions of western New York. Perrysburg,
N.Y., reported a midday total of 19.1 inches of snow. Ironwood, Mich., reported a midday total of 15.8 inches of snow. Cold and dry weather prevailed over the northern and central Plains. Hettinger, N.D., recorded a morning low of -23 degrees with a wind
chill factor of -37 degrees. Additionally, a stalled out frontal boundary generated light to moderate rain along the southern edge of the Florida Peninsula.

11-17: An area of low pressure transitioned across the Northeast on Monday, while a blast of cold air surged over the upper Intermountain West, the northern Plains and the upper Midwest. A broad area of low pressure shifted east northeastward over the
eastern Great Lakes, southeast Canada and the Northeast. Moderate to heavy snow and gusty winds impacted the upper Midwest, Upstate New York and northern New England. Another cold frontal boundary stretched southwestward over the upper Mississippi Valley,
the northern Plains and the Intermountain West. Scattered snow showers formed near this frontal boundary over the northern tier of the country. Arctic air also surged across the region on Tuesday. Wind chill advisories were issued for northern Montana.
Glasgow, Mont., recorded a morning low of -12 degrees with a wind chill factor of -27 degrees. Just to the west, an onshore flow brought light to moderate rain and mountain snow to Washington and northwest Oregon.

Rain and snow impacted the Northwest on Wednesday, while lake effect snow affected the upper Midwest and the Northeast. A low pressure system approached the West Coast. This system interacted with a plume of moisture, which lead to the development of
heavy rain in northern California and western Oregon. Meanwhile, a frigid air mass surged over the northern Plains, the Midwest and parts of the Northeast. Wind chill advisories were issued from The Dakotas to the central Appalachians. Cut Bank, Mont.,
recorded a morning low of -18 degrees with a wind chill factor of -36 degrees. Aurora, Ill., recorded a morning low of -11 degrees with a wind chill factor of -28 degrees.
Weather Underground midday recap for Friday, December 16, 2016

Snow showers developed from the Intermountain West to the Great Lakes on Friday, while rain moved across the Southwest. An area of low pressure shifted over the Great Basin and the Intermountain West. This system interacted with a moist air mass and
generated a mixture of rain and snow over northern California, the Great Basin and the Intermountain West. Heavy snow impacted western facing mountain slopes, especially in the Sierra Nevada, the Wasatch and the Rockies. Meanwhile, widespread snow
impacted the northern Plains and the upper Midwest. Additionally, a blast of arctic air affected the northern tier of the country. Mount Washington, N.H., recorded a morning low of -34 degrees with a wind chill factor of -87 degrees. Dickinson, N.D.,
recorded a morning low of -4 degrees with a wind chill factor of -25 degrees.

18-24: A cold frontal boundary will clear most of the East Coast on Monday, while a separate system brings impacts to the Northwest. A cold frontal boundary will extend southwestward over the western Atlantic, the Florida Peninsula and the Gulf of Mexico.
Rain and embedded thunderstorms will develop along and near this frontal boundary across portions of the southern Mid-Atlantic, the Southeast and the Gulf Coast. Freezing rain will be possible in parts of eastern North Carolina. Northwest of the frontal
boundary, arctic air will surge east southeastward over the Midwest, the Mid-Atlantic and the Northeast. Most states across the eastern half of the country will experience below normal temperatures on Monday. Meanwhile, a couple waves of low pressure
will transition east southeastward over south central Canada and the upper Great Lakes. As a result, light to moderate snow showers will develop in parts of northern North Dakota, northern Minnesota, northern Michigan and western New York. Further to the
west, a cold frontal boundary is expected to generate moderate to heavy rain and mountain snow in the Pacific Northwest and the upper Intermountain West. Portions of the interior Pacific Northwest may experience freezing rain on Monday. Most of the Great
Basin and the Southwest will stay dry.

An area of low pressure transitioned across the Northeast on Monday, while a blast of cold air surged over the upper Intermountain West, the northern Plains and the upper Midwest. A broad area of low pressure shifted east northeastward over the eastern
Great Lakes, southeast Canada and the Northeast. Moderate to heavy snow and gusty winds impacted the upper Midwest, Upstate New York and northern New England. Another cold frontal boundary stretched southwestward over the upper Mississippi Valley, the
northern Plains and the Intermountain West. Scattered snow showers formed near this frontal boundary over the northern tier of the country. Arctic air also surged across the region on Tuesday. Wind chill advisories were issued for northern Montana.
Glasgow, Mont., recorded a morning low of -12 degrees with a wind chill factor of -27 degrees. Just to the west, an onshore flow brought light to moderate rain and mountain snow to Washington and northwest Oregon.

25-31: The Plains experienced dry weather on the 29th. A mix of rain and snow is fell across the lower Great Lakes region. Breezy, colder air is overspreading the remainder of the Midwest, accompanied by a few snow showers. In the South, showers
stretching from the Mid-Atlantic region to the central Gulf Coast are associated with a developing storm system. The rain is further helping the Southeast recover from a serious autumn drought.

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