NATIONAL STORM 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. Harlingen, Texas,
reported a midday total of 0.33 of an inch of rain. Scattered showers and mountain snow also impacted the Four Corners. Winter storm warnings and winter weather advisories were issued in New Mexico and northwest Texas. 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. Quillayute, Wash., reported a midday total of 1.45 inches of rain. Astoria, Ore., reported a
midday total of 0.19 of an inch of rain. Back east, a mixture of rain and snow continued to fall in portions of the upper Midwest, the northern Mid-Atlantic and New England. Presque Isle, Maine, reported a midday total of 11.3 inches of rain. Erie, Pa.,
reported a midday total of 0.49 of an inch of rain.

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. Tornado watches were issued along the Florida Panhandle and southern Alabama. In addition, flood warnings were issued for
parts of southwest Louisiana and southeast Texas. Gonzales, La., reported a midday total of 2.45 inches of rain. Panama City, Fla., reported a midday total of 1.70 inches of rain. To the north, a weak disturbance produced a light mixture of rain and snow
from the upper Midwest to New England. Roxbury, Conn., reported a midday total of 2.1 inches of snow. Plymouth, Ind., reported a midday total of 3.8 inches of snow. 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. Blizzard warnings were issued in northeast Montana, while winter storm warnings were issued for northeast North Dakota and northwest Minnesota. Rawlins, Wyo., recorded wind
gusts of 60 mph. Lincoln, Mont., reported a midday total of 16.0 inches of snowAdditionally, an onshore flow from the Pacific generated light to moderate rain and mountain snow from northwest Oregon to western Washington. Chehalis, Wash., reported a
midday total of 2.0 inches of snow.

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. Astoria, Ore., reported a midday total of 1.05 inches of rain. Arcata, Calif., reported a midday
total of 0.54 of an inch of rain. 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. Yelm, Wash., reported a midday total of 4.6 inches of
snow. Polson, Mont., reported a midday total of 4.0 inches of snow.

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. Blizzard warnings were issued for northwest Michigan. Winter storm warnings and winter
weather advisories were also issued in central and northern Maine. White Lake, Mich., reported a midday total of 11.3 inches of snow. Bethel, Maine, reported a midday total of 4.8 inches of snow. A mixture of rain, freezing rain and snow also affected
the central Appalachians, the northern Mid-Atlantic and the coast New England. Imler, Pa., reported a midday total of 0.20 of an inch of ice. A cold frontal boundary extended southwestward from southern New England to the western Gulf Coast. Rain and
embedded thunderstorms formed along and near this frontal boundary over parts of the Deep South, the Southeast and the Mid-Atlantic. Flood warnings were issued in southwest Louisiana. Panama City Tyndall Air Force Base, Fla., reported a midday total of 2.
88 inches of rain. Oak Ridge, Tenn., reported a midday total of 1.26 inches of rain.

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. Flash flood watches were issued across the region on Wednesday. Brookings, Ore., reported a midday total of 2.49 inches of rain. Crescent City, Calif., reported a midday total of 2.46 inches of rain.
A mixture of rain, freezing rain and snow also developed from the interior Pacific Northwest to the Intermountain West. Winter storm warnings were issued from western Oregon to southern Montana. Crescent, Ore., reported a midday total of 10.0 inches of
snow. 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. The same air mass interacted with the relatively warm waters of
the Great Lakes, which lead to lake effect snow in the upper Midwest and the Northeast. Blizzard warnings were issued in northwest Michigan. Lake effect snow warnings were issued from northeast Ohio to Upstate New York. Gay, Mich., reported a midday
total of 10.0 inches of snow. Lackawanna, N.Y., reported a midday total of 5.0 inches of snow. Additionally, a cold frontal boundary generated rain and embedded thunderstorms in parts of the Southeast. Panama City, Fla., reported a midday total of 1.02
inches of rain.

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. Blizzard warnings were issued in
southeast Idaho. Winter storm warnings were issued across much of the Intermountain West. Mount Rose Ski Area, Nev., reported a midday total of 21.0 inches of snow. Cooke City, Mont., reported a midday total of 14.0 inches of snow. A cold frontal
boundary associated with this system extended southwestward over the Southwest. This frontal boundary brought periods of moderate to heavy rain and high elevation snow to southern California, southern Nevada and parts of the Four Corners. June Lake,
Calif., reported a midday total of 36.0 inches of snow. Tehachapi, Calif., reported a midday total of 1.59 inches of rain. Meanwhile, widespread snow impacted the northern Plains and the upper Midwest. Winter storm warnings and winter weather advisories
were issued from South Dakota to Maine. Paradise, Mich., reported a midday total of 30.0 inches of snow. Rochester, N.Y., reported a midday total of 9.4 inches of snow.

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. Blizzard warnings were
issued for northwest Michigan. Winter storm warnings and winter weather advisories were also issued in central and northern Maine. White Lake, Mich., reported a midday total of 11.3 inches of snow. Bethel, Maine, reported a midday total of 4.8 inches of
snow. A mixture of rain, freezing rain and snow also affected the central Appalachians, the northern Mid-Atlantic and the coast New England. Imler, Pa., reported a midday total of 0.20 of an inch of ice. A cold frontal boundary extended southwestward
from southern New England to the western Gulf Coast. Rain and embedded thunderstorms formed along and near this frontal boundary over parts of the Deep South, the Southeast and the Mid-Atlantic. Flood warnings were issued in southwest Louisiana. Panama
City Tyndall Air Force Base, Fla., reported a midday total of 2.88 inches of rain. Oak Ridge, Tenn., reported a midday total of 1.26 inches of rain. Just to the west, an onshore flow brought light to moderate rain and mountain snow to Washington and
northwest Oregon.

25-31: A major winter storm will continue to rattle the central Plains with severe thunderstorms into Christmas evening. The severe weather threat includes the potential for a tornado or two. The greatest risk for tornadoes will be near and north of
Interstate 70 over the central Plains. South and east of blizzard conditions, a surge of warm air over the central and southern Plains will increase the risk for violent thunderstorms on Christmas.
An emergency manager reported roof damage due to the winds in Snyder, Oklahoma, earlier on Sunday. Additional property damage may result into the evening hours. There is a likelihood of sporadic power outages and secondary road closures due to fallen
trees and high water. The thunderstorms will cross Tulsa, Oklahoma; Topeka, Kansas; Kansas City and Joplin, Missouri; and Omaha, Nebraska. The line of thunderstorms will reach the I-35 corridor east of Wichita during Christmas evening.

A cold front associated with a Reinforcing surge of cold air was pushing eastward across upstate New York as well as across the Mid-Atlantic states on Thursday. National Weather service radar and surface observations indicated a large area of light to
moderate snow, locally heavy, was moving eastward across upstate New York into much of central New England ahead of the cold front. Meanwhile, precipitation was in the form of rain across southern New England just ahead of an intensifying coastal low.

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