Azores HighAlternate term for Bermuda High - a semi-permanent, subtropical area of high pressure in the North Atlantic Ocean off the East Coast of North America that migrates east and west with varying central pressure. Depending on the season, it has different names. When it is displaced westward, during the Northern Hemispheric summer and fall, the center is located in the western North Atlantic, near Bermuda. In the winter and early spring, it is primarily centered near the Azores in the eastern part of the North Atlantic. Also known as Azores High. Bermuda HighA semi-permanent, subtropical area of high pressure in the North Atlantic Ocean off the East Coast of North America that migrates east and west with varying central
pressure. Depending on the season, it has different names. When it is displaced westward, during the Northern Hemispheric summer and fall, the center is located in the western North
Atlantic, near Bermuda. In the winter and early spring, it is primarily centered near the Azores in the eastern part of the North Atlantic. Also known as Azores High.Bubble HighA mesoscale area of high pressure, typically associated with cooler air from the
rainy downdraft area of a thunderstorm or a complex of thunderstorms. A gust front or outflow
boundary separates a bubble high from the surrounding air.Channeled High WindsIn mountainous areas or in cities with tall buildings, air may be channeled through constricted passages producing high winds. Santa Ana winds and winds through passes from the cold Alaskan interior to the sea are examples of these winds. Channeled high winds are local in nature but can be extremely strong. These winds generally occur in well-defined areas.Gradient High WindsThese high winds usually cover a large area and are due to synoptic-scale, extra-tropical low pressure systems.High(abbrev. HI)- In meteorology, a region of high pressure; also known as anticyclone. High CloudsThese clouds have bases between 16,500 and 45,000 feet in the mid latitudes. At this
level they are composed of primarily of ice crystals. Some clouds at this level are cirrus,
cirrocumulus, and cirrostratusHigh Energy EventIn solar-terrestrial terms, flares (class two or more) with outstanding Centimetric
Bursts and SID. High Energy Protons are reported at the Earth in
case of most of these events occurring on the western part of solar
disk. (Class X flares)High Flow Magnitude (HFM)The magnitude of the maximum forecast streamflow conditions, measured in terms of annual exceedance probabilities.High Frequency (HF)The portion of the radio frequency spectrum between
between 3 and 30 MHzHigh LatitudesWith specific reference to zones of geomagnetic activity,
"high latitudes" refers to 50º to 80º geomagnetic.High Resolution Ensemble Forecast (HREF)An ensemble of products from several different models running at ~3 km horizontal grid spacing.High Resolution Rapid Refresh (HRRR)A real-time 3-km resolution, hourly updated, cloud-resolving, convection-allowing atmospheric model, initialized by 3km grids with 3km radar assimilation.High Risk (of severe thunderstorms)Severe weather is expected to affect more than 10 percent of the
area. A high risk is rare, and implies an unusually dangerous situation and usually the possibility of a major
severe weather outbreak.High Seas Forecast(HSF) - Marine forecasts for the major oceans of the world. In this context, major gulfs or seas (e.g., the Gulf of Mexico or the Bering Sea) are included within these forecast areas. Areas of responsibility for the U.S. are determined by international agreements under the auspices of the World Meteorological Organization (WMO).High SurfLarge waves breaking on or near the shore resulting from swells spawned by a distant storm.High Surf AdvisoryA High Surf Advisory is issued when breaking wave action poses a threat to life and property within the surf zone. High surf criteria vary by region. High Surf Advisories are issued using the Coastal and Lakeshore Hazard Message (CFW) product. High Surf WarningA High Surf Warning is issued when breaking wave action results in an especially heightened threat to life and property within the surf zone. High surf criteria vary by region. High Surf Warnings are issued using the Coastal and Lakeshore Hazard Message (CFW) product. High Water Arrival TimeThe time at which a stream reach is forecast to achieve its high water flow within the forecast period.High Water FlowThe Office of Water Prediction (OWP) uses the term “high water” as an indicator of elevated flows for a given stream reach. This regionally varied threshold is used in many National Water Model (NWM) data services, such as maximum high flows, peak and high flow arrival times, rapid onset flooding, and flood inundation mapping. Filtering on flows that are greater than or equal to the high water threshold allows these services to focus on areas where flows are significant enough to monitor - where there is potential flooding, for example. High water thresholds are established for eleven clusters that categorize runoff efficiencies across the Continental United States (ConUS). Hawaii, Puerto Rico, and U.S. Virgin Islands domains utilize the 2.0 year recurrence interval for the high water threshold.High Water ProbabilityThe probability (%) that a stream will reach its high water flow within the forecast period.High WindSustained wind speeds of 40 mph or greater lasting for 1 hour or longer, or winds of 58 mph or greater for any duration.High Wind AdvisoryThis product is issued by the National Weather Service when high wind speeds may pose a hazard. The criteria for this advisory varies from state to state. In
Michigan, the criteria is sustained non-convective (not related to thunderstorms) winds greater than or equal to 30 mph lasting for one hour or longer, or winds greater than or equal to 45
mph for any duration.High Wind WarningThis product is issued by the National Weather Service when high wind speeds may pose a hazard or is life threatening. The criteria for this warning varies from
state to state. In Michigan, the criteria is sustained non-convective (not related to thunderstorms) winds greater than or equal to 40 mph lasting for one hour or longer, or winds greater
than or equal to 58 mph for any duration.High Wind WatchThis product is issued by the National Weather Service when there is the potential of high wind speeds developing that may pose a hazard or is life threatening. The
criteria for this watch varies from state to state. In Michigan, the criteria is the potential for sustained non-convective (not related to thunderstorms) winds greater than or equal to 40
mph and/or gusts greater than or equal to 58 mph. High-Speed StreamIn solar-terrestrial terms, a feature of the solar wind having velocities that are
about double average solar wind values.MesohighA relatively small area of high atmospheric pressure that forms beneath a thunderstorm. It is usually associated with an MCS or its remnants. Mesoscale High WindsThese high winds usually follow the passage of organized convective systems and are associated with wake depressions or strong mesohighs.North Pacific HighA semi-permanent, subtropical area of high pressure in the North Pacific Ocean. It is strongest in the Northern Hemispheric summer and is displaced towards the equator during the winter when the Aleutian Low becomes more dominate. Comparable systems are the Azores High and the Bermuda High.Omega HighA warm high aloft which has become displaced and is on the polarward side of the jet stream. It frequently occurs in the late winter and early spring in the Northern Hemisphere. The name comes from its resemblance to the Greek letter, Omega, when analyzed on upper air charts. It is an example of a blocking high.Thermal HighArea of high pressure that is shallow in vertical extent and produced primarily by cold surface temperatures.Ultra High Frequency (UHF)Those radio frequencies exceeding 300 MHzVer High Frequency (VHF)That portion of the radio frequency spectrum
from 30 to 300 MHz
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