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2016 Weather Synopsis - A First Look at the Weather
It appears that the winter of 2015-2016 is going to be unseasonably cold over the Atlantic Seaboard, eastern portions of the Great Lakes and Ohio Valley, and most of the Tennessee and Mississippi Valleys, as well as much of the Gulf Coastal Plain. New England will experience particularly frigid temperatures.
Much of the central United States will see near-normal temperatures. This includes the western and central Great Lakes and Ohio Valley, and most of the Great Plains. In these areas, Mother Nature will mix intervals of unseasonably mild temperatures with occasional shots of bitter cold.
Farther west, over the Rockies, the Colorado Plateau, Pacific Northwest, and the Southwest States, milder than normal temperatures are expected.
Precipitation-wise, if you like snow, then you should head to the northern and central Great Plains, and the Great Lakes and Ohio Valley, where snowier-than-normal conditions are forecast.
Over the Northeast and Mid-Atlantic States, we are “red-flagging” the second week of January, and the second week of February for possible heavy winter weather. A protracted spell of stormy weather is expected to extend through much of the first half of March.
An active storm track will bring above-normal precipitation to the Southeastern States, as well as the Mississippi Valley, Southern Great Plains, and the Gulf Coast. Another area of above-normal precipitation will cover much of the Pacific Northwest. Near-normal winter precipitation will cover the rest of the country.
So far as spring and summer are concerned, we are forecasting a mild and wet spring for most parts of the country. As we move into the summer season there will be a greater-than-normal coverage of thunderstorms, particularly over the eastern third of the nation. In addition, during June and July in the middle part of the country, over “tornado alley”, some widespread tornadic activity seems possible.
Portions of the Central and Southern Rockies and Great Plains could also experience higher-than-normal thunder-storm activity. It will also be an above-normal summer temperature-wise for about two-thirds of the country, especially for the Southern and Eastern United States. While typically the hottest weather can usually be expected in late July or early August, this year’s summer heat could peak in late August into early September.
As for tropical activity…we are forecasting tropical storm threats for early July, late August, and late September along the Gulf Coast, hurricane threats in early August along the Gulf Coast, and mid-August along the Atlantic Coast. Keep in mind the traditional peak of the hurricane season is September 10.
High/Low Temperature of the Day
The highest temperature of the day will be about 4:00 p.m., not at 12:00 noon as you might think.
The lowest temperature of the day will occur about sunrise, not at midnight as you might think.
|Advection||Horizontal movement of moisture, fog, etc.|
|Air Mass||A large body of air in which the horizontal difference in temperature and moisture is quite small. Usually used in reference to large high-pressure areas.|
|Angels||Usually used to identify radar echoes occurring in clear air or radar echoes of unknown origin that are not associated with precipitation. Also known as ghosts.|
|Anticyclone||High pressure area. Winds flow clockwise (Northern Hemisphere) and away from center. Air is descending near the center.|
|Below Minimums||In aviation when the clouds above ground level are 1,000 feet or less and/or the visibility is 3 miles or less. Requires instrument flight rules.|
|Celsius||A temperature scale. C = 5/9 (F-32).|
|Clear Skies||Less than 1/10 of the sky is covered by clouds.|
|Cloud||A visible mass of very small water or ice particles.|
|Cold Front||A zone where cold air is replacing warm air.|
|Collar Cloud||A cyclonically rotating band of clouds which suggests the possibility of a tornado or that band of clouds rotating around the tornado where it comes out of the base of the thunderstorm.|
|Convection||Usually means vertical movement of air upward due to heating from the sun.|
|Convergence||Where the horizontal wind flow into a certain region is greater than the outflow. Usually results in rising air when occurring along the surface of the earth.|
|Cyclone||Low pressure area. Wind flows counterclockwise (Northern Hemisphere) and toward the center of the low and rises near the center.|
|Dew point||The temperature to which air must be cooled (pressure and moisture remaining constant) to cause clouds or fog to form.|
|Divergence||Where the horizontal wind flow out of a certain region is greater than in inflow. Usually associated with areas of high pressure.|
|Dry Line||The zone between one very dry air mass and another very moist air mass. On occasion, thunderstorms become very active on the east side of the dry line.|
|Exosphere||The very outer limits of our atmosphere. Not believed to be of meteorological significance.|
|Fahrenheit||A temperature scale. F = 9/5 C + 32. (32 F = 0 C.)|
|Fair Skies||Less than four tenths of the sky is covered with clouds of the low type. Implies good weather.|
|Occurs near September 22 and marks the beginning of fall and the end of summer. Sun’s rays are perpendicular to the equator.|
|Fine Line||A radar echo that appears as a fairly long thin line and is not associated with precipitation. It apparently is caused by an abrupt temperature and/or humidity change in the air and quite often signals the approaching wind shift of a front or winds from a line of thunderstorms.|
|Fog||A cloud with its base on or near the surface of the earth.|
|Frontal System||Used to describe the cold, warm and/or stationary fronts associated with the same storm system or low pressure area.|
|Frontogenesis||The formation of a front.|
|Frontolysis||The dissipation of a front.|
|Frost||Moisture that freezes on surfaces usually in clear, stable air and light winds.|
|Funnel Cloud||A tornado not touching the ground.|
|High Pressure Area||Anticyclone. Winds flow clockwise away from the center. A region of stable and descending air.|
|IFR||Instrument flight rules. When clouds above ground level are 1,000 feet or less and/or the visibility is 3 miles or less.|
|Increasing Cloudiness||Used when the amount of the sky covered with clouds is expected to be greater than at the present time. Often used to suggest the approach of stormy weather.|
|Inversion||Where the temperature increased as you go up in atmosphere (rather than decreases, as is expected normally).|
|Isobar||A line connecting points of equal pressure. The closer these lines, usually the stronger the winds.|
|Isotherm||A line connecting points of equal temperature.|
|Jet Stream||A band of winds in the upper atmosphere of 50 knots or greater…average jet winds are about 100 to 150 knots with an average length of 1,000 to 3,000 miles, and 3,000 to 7,000 feet in depth. The average height of the jet stream above ground level in the mid-latitudes is approximately 35,000 feet. One knot = 1.15 mph.|
|Low Pressure||Cyclone. Winds flow counterclockwise (Northern Hemisphere) and toward the center of the low system and then rise near the center.|
|Mesosphere||A region of our atmosphere which extends from about 32 to 50 miles above the earth’s surface. Is marked by decreasing temperatures.|
|Norther||Usually describes a fast moving cold front, which brings much colder temperatures and strong northerly winds.|
|Overcast||Used to describe the sky condition when 95% or more is covered with clouds.|
|Overrunning||When warm and usually moist air is going up over the colder and more dense air of a cold air mass.|
|Partly Cloudy||When four tenths to seven tenths of the sky is covered with clouds.|
|Precipitation||Moisture that is falling from a cloud in liquid or solid form. Rain, sleet, snow, hail, etc.|
|Pressure||The weight of the air above a given location from the surface of the earth to the top of the atmosphere.|
|Pressure Gradient||Horizontal change in pressure. The larger the change, the tighter the gradient and usually the stronger the winds.|
|Relative Humidity||The amount of moisture (water vapor) in the air relative to the maximum amount it can hold.|
|Ridge||As elongated area of high atmospheric pressure.|
|Roll Cloud||Low clouds associated with an approaching thunderstorm, which appear in a low rolling band.|
|Short Wave||Minor. Usually refers to a small disturbance near the 18,000 foot level which is capable of producing weather.|
|Occurs near March 21 with the sun’s rays perpendicular to the equator. Marks the beginning of spring and the end of winter.|
|Squall Line||A line of active thunderstorms.|
|Stable Air||Air which resists upward movement and is usually free of precipitation.|
|Stationary Front||A front that is not moving.|
|Stratosphere||That layer of air extending from approximately 7 miles to 32 miles above the surface of the earth. Is marked by a slight temperature increase.|
|Occurs near June 21 with the sun’s plane striking the earth at 23-1/2 north latitude. Marks the beginning of summer and the end of spring.|
|Temperature||May be regarded as the degree of hotness or coldness or as a measure of heat intensity.|
|Thermosphere||That layer of air extending from about 150 miles above the earth’s surface to the outer limits of atmosphere.|
|Troposphere||That layer of air extending from the earth’s surface to approximately 7 miles. Most of our weather occurs in this layer.|
|Trough||An elongated area of low atmospheric pressure. Sometimes will produce weather of various types.|
|Unstable Air||Air which can be displaced upward easily and is capable of producing clouds and precipitation.|
|Variable Cloudiness||Describes the condition of the sky when it is expected there will be varying amounts of cloud cover. In other words, sometimes cloudy and sometimes partly cloudy, all during a certain forecast period.|
|VFR||Visual flight rules. When the clouds above ground level are greater than 1,000 feet and the visibility is greater than 3 miles.|
|Virga||Precipitation that is falling from a cloud, but is evaporating before it hits the ground.|
|Warm Front||A zone where warm air is replacing cold air.|
|Wind Direction||Direction from which the wind is blowing.|
|Occurs near December 22 with the sun’s plane striking the earth at 23-1/2 degrees south latitude. Marks the end of fall and the beginning of winter.|