Heavy Snow Discussion (HSD) This message discusses the potential for heavy snowfall in the contiguous United States. The threshold value in this product for heavy snow is 4" or more in a 12-hour period.
Heavy Snow Warning- Issued when snowfall of 6 inches (15 cm) or more in 12 hours or 8 inches (20 cm) or more in 24 hours is imminent or occurring. These criteria are specific for the Midwest and may vary regionally.
Heavy Snow
This generally means...
snowfall accumulating to 4" or more in depth in 12 hours or less; or
snowfall accumulating to 6" or more in depth in 24 hours or less ...
Heavy Snow- usually means snowfall of four air inches or more in twelve hours or less, or six inches or more in twenty-four hours or less in lower elevation; in higher elevations it means twelve inches or more in twelve hours or less, ...
HEAVY SNOW - In the Inland Northwest, mountains above 3000 feet - 8 to 12 inches in 12 hours or 12-18 inches or more in 24 hours. For the valleys and Basin below 3000 feet - 4 inches in 12 hours and 6 inches in 24 hours.
Heavy Snow Warning- Older terminology replaced by winter storm warning for heavy snow. Issued when 7 or more inches of snow or sleet is expected in the next 24 hours.
Heavy Snow Warning - Issued when snowfall totaling 6 inches or more in 12 hours or less is expected. Also issued when snowfall totaling 8 inches or more in 24 hours or less is expected.
Heavy Snow Warning: A snowfall of at least 4 inches in 12 hours or 6 inches in 24 hours.
High: An area of high pressure: Anticyclonic.
High Pressure:Moves towards low pressure.
High Pressure: The winds are "Clockwise" (CW) in Northern Hemisphere.
Heavy snow accompanied by a gale force wind.
Buys Ballots Law
A physical law describing wind flow around high and low pressure.
HEAVY SNOW: In general, snowfall is accumulating at the rate of either 4 inches or more in 12 hours or less, or 6 inches or more in 24 hours or less.
NCEP Heavy Snow Discussion
NOAA National Weather Service - Cite This Source - This Definition ...
describes heavy snowfall in the lee (downwind) of large bodies of water, such as the Great Lakes in North America.
QPFHSD: NCEP Heavy Snow Discussion
QPFPFD: NCEP Precipitation Forecast Discussion
Quasi-stationary: Describes a low or high pressure area or a front that is nearly stationary.
SNOW SQUALL
A heavy snow shower accompanied by sudden strong winds, or a squall.
WINTER STORM: A heavy snow event. In the Sierra Nevada below 7000 feet, a snow accumulation of 6 inches/12 hrs or 12 inches/24 hrs; and above 7000 feet, 8 inches/12 hrs or 18 inches/24 hrs.
WINTER STORM: A heavy snow event.
ZULU: Equivalent to UTC or Greenwich Mean Time (GMT).
1 Original version of this glossary was developed by the author, Jan Null, 1996.
2 Current update February 2003.
Heavy snowDepending on the region of the USA, this generally means that four or more inches of snow has accumulated in 12 hours, or six or more inches of snow in 24 hours.
Snow SquallA snow squall is an intense, but limited duration, period of moderate to heavy snowfall, accompanied by strong, gusty surface winds and possibly lightning (generally moderate to heavy snow showers). Snow accumulation may be significant.
In winter, these systems usually deposit heavy snows north of their surface track. Thunderstorms may be found south of the track. ParameterA subset of the group of evaluations that constitute each element of an observation.
SPC also puts out MCDs for hazardous winter weather events on the mesoscale, such as locally heavy snow, blizzards and freezing rain (see below).
Warnings state a particular hazard or imminent danger, such as tornadoes, severe thunderstorms, flash and river floods, winter storms, heavy snows, etc.
" However, in heavy snow situations where there is considerable uncertainty concerning the range of values, more appropriate phrases are used, such as "...up to 12 inches..." or alternatively "...8 inches or more...".
The prime conditions for heavy snowfall in the Australian Alps are persistent strong westerlies through the winter, which produce abundant precipitation and are generally accompanied by relatively low temperatures.
Heavy snow or rain can bring transportation and commerce to a stand-still, as well as cause flooding in low-lying areas. Excessive heat or cold waves can kill or sicken those without adequate utilities.
These winter weather events are notorious for producing heavy snow, rain, and tremendous waves that crash onto Atlantic beaches, often causing beach erosion and structural damage.
Also by this time, widespread moderate to heavy snows extended from Alabama to New York (Fig 1.4), virtually paralyzing the eastern third of the country.
SNOW SQUALL - A sudden and very heavy snow shower. Can be associated with snow thunderstorms or simply having strong winds prevailing off a relatively warm body of water in freezing, unstable conditions.
Sugar snow is composed of crumbly ice crystals, while mashed potato snow is dense heavy snow so thick a shovel will stand up in it. I think sugar snow is relatively better for skiers.
In southeastern France, the cold north wind with snow is termed blizzard (see also boulbie). Similar storms in Russian Asia are the buran and purga. In popular usage in the United States and in England, the term is often used for any heavy snowstorm ...
 See also: Weather, Precipitation, Temperature, Storm, Forecast
  
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