Subj : Wx Terms (H)(3)
To   : All
From : Daryl Stout
Date : Sun Jul 09 2017 12:04 am

HP Storm
or HP Supercell - High-Precipitation storm (or High-Precipitation
supercell). A supercell thunderstorm in which heavy precipitation
(often including hail) falls on the trailing side of the mesocyclone.

Precipitation often totally envelops the region of rotation, making
visual identification of any embedded tornadoes difficult and very
dangerous. Unlike most classic supercells, the region of rotation in
many HP storms develops in the front-flank region of the storm
(i.e., usually in the eastern portion). HP storms often produce
extreme and prolonged downburst events, serious flash flooding, and
very large damaging hail events.

hPa
Hectopascal- A unit of pressure equal to a millibar (1 hPa = 1 mb).

HPC
Hydrometeorological Prediction Center

HR
Hour

HRS
hours

HSA (Hydrologic Service Area)
A geographical area assigned to Weather Service Forecast
Office's/Weather Forecast Office's that embraces one or more rivers.

Humidity
Generally, a measure of the water vapor content of the air. Popularly,
it is used synonymously with relative humidity.

Humidity Recovery
The change in relative humidity over a given period of time; generally
between late evening and sunrise. The moisture change in the fine fuels
during this period is directly related to the amount of humidity
recovery.

Hummock
In hydrologic terms, a hillock of broken ice which has been forced
upward by pressure.

Hummocked Ice
In hydrologic terms, ice piled haphazardly one piece over another to
form an uneven surface.

Hurricane
(abbrev. HURCN) A tropical cyclone in the Atlantic, Caribbean Sea,
Gulf of Mexico, or eastern Pacific, which the maximum 1-minute sustained
surface wind is 64 knots (74 mph) or greater.

Hurricane Force Wind Warning
A warning for sustained winds, or frequent gusts, of 64 knots (74 mph)
or greater, either predicted or occurring, and not directly associated
with a tropical cyclone.

Hurricane Local Statement
A public release prepared by local National Weather Service offices in
or near a threatened area giving specific details for its county/parish
warning area on

(1) weather conditions
(2) evacuation decisions made by local officials
(3) other precautions necessary to protect life and property.

Hurricane Season
The part of the year having a relatively high incidence of tropical
cyclones. In the Atlantic, Caribbean, and Gulf of Mexico, and central
North Pacific, the hurricane season is the period from June through
November; in the eastern Pacific, May 15 through November 30. Tropical
cyclones can occur year-round in any basin.

Hurricane Warning
A warning that sustained winds 64 kt (74 mph or 119 kph) or higher
associated with a hurricane are expected in a specified coastal area
in 24 hours or less. A hurricane warning can remain in effect when
dangerously high water or a combination of dangerously high water and
exceptionally high waves continue, even though winds may be less than
hurricane force.

Hurricane Watch
An announcement of specific coastal areas that a hurricane or an
incipient hurricane condition poses a possible threat, generally
within 36 hours.

HV
have

HVY
Heavy

HWVR
However

Hyder Flare
In solar-terrestrial terms, a filiment-associated two-ribbon flare,
often occurring in spotless regions. The flare presumably results from
the impact on the chromosphere of infalling filament material.

Hydraulic Fill Dam
In hydrologic terms, a dam constructed of materials, often dredged, that
are conveyed and placed by suspension in flowing water.

Hydraulic Flow
Atmospheric flow that is similar in character to the flow of water over
an obstacle.

Hydraulic Grade Line
In hydrologic terms, a line whose plotted ordinate position represents
the sum of pressure head plus elevation head for the various positions
along a given fluid flow path, such as along a pipeline or a ground
water streamline.

Hydraulic Head
In hydrologic terms,

(1) The height of the free surface of a body of water above a given
point beneath the surface.

(2) The height of the water level at the headworks, or an upstream point,
of a waterway, and the water surface at a given point downstream.

(3) The height of a hydraulic grade line above the center line of a
pressure pipe, at a given point.

Hydraulic Jump
A steady disturbance in the lee of a mountain, where the airflow passing
over the mountain suddenly changes from a region of low depth and high
velocity to a region of high depth and low velocity.

Hydraulic Permeability
In hydrologic terms, the flow of water through a unit cross-sectional
area of soil normal to the direction of flow when the hydraulic gradient
is unity.

Hydrograph
In hydrologic terms, a graph showing the water level (stage), discharge,
or other property of a river volume with respect to time.

Hydrograph Separation
In hydrologic terms, the process where the storm hydrograph is separated
into baseflow components and surface runoff components.

Hydrographic Survey
In hydrologic terms, an instrumental survey to measure and determine
characteristics of streams and other bodies of water within an area,
including such things as location, areal extent, and depth of water in
lakes or the ocean; the width, depth, and course of streams; position
and elevation of high water marks; location and depth of wells, etc.

Hydrologic Budget
In hydrologic terms, an accounting of the inflow to, outflow from, and
storage in, a hydrologic unit, such as a drainage basin, aquifer, soil
zone, lake, reservoir, or irrigation project.

Hydrologic Cycle
The description of the transport of water substance between the earth,
the atmosphere, and the seas.
or
In hydrologic terms, the natural pathway water follows as it changes
between liquid, solid, and gaseous states.

Hydrologic Equation
In hydrologic terms, the water inventory equation (Inflow = Outflow +
Change in Storage) which expresses the basic principle that during a
given time interval the total inflow to an area must equal the total
outflow plus the net change in storage.

Hydrologic Model
In hydrologic terms, a conceptual or physically-based procedure for
numerically simulating a process or processes which occur in a watershed.

Hydrologic Service Area
HSA. A geographical area assigned to Weather Service Forecast
Office's/Weather Forecast Office's that embraces one or more rivers.

Hydrology
The scientific study of the waters of the earth, especially with
relation to the effects of precipitation and evaporation upon the
occurrence and character of water on or below the land surface.

Hydrometeor
A particle of condensed water (liquid, snow, ice, graupel, hail) in the
atmosphere.

Hydrometeorologists
In hydrologic terms, individuals who have the combined knowledge in the
fields of both meteorology and hydrology which enables them to study and
solve hydrologic problems where meteorology is a factor.

Hydrometeorology
The part of meteorology that pertains to hydrology.

Hydrostatic Head
In hydrologic terms, a measure of pressure at a given point in a liquid
in terms of the vertical height of a column of the same liquid which
would produce the same pressure.



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