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Humid continental climate
The humid continental climate, also called temperate continental, is a mid-latitude Köppen D climate with warm to hot summers, severe winters, and no dry season, typical of northeastern North America and eastern Europe and Asia.
Humid subtropical climate
A humid subtropical climate, designated Cfa or Cwa in the Köppen classification, has hot, humid summers and cool winters, occurring on east coasts of continents between 20° and 40° latitude.
Humidex
The Humidex is a Canadian index combining air temperature and humidity into a single number for how hot humid weather feels, used officially by Environment Canada.
Humidity
Humidity, also called atmospheric humidity, is the water vapor content of the air, popularly expressed as relative humidity and also measured as specific humidity and dew point.
Humphry Davy
Sir Humphry Davy, 1st Baronet (1778–1829), was a British chemist who used electrolysis to isolate several elements, discovered nitrous oxide's effects, and invented the miners' safety lamp.
Humulene
Humulene, more precisely α-humulene (also called α-caryophyllene), is a naturally occurring sesquiterpene hydrocarbon and a major constituent of hop essential oil, contributing to the kettle-hop aroma of beer.
Hund's metal
A Hund's metal is a multi-orbital metal whose strong correlations are governed by Hund's rule coupling instead of Hubbard repulsion, combining large local magnetic moments with metallic transport.
Hund's rule of maximum multiplicity
Hund's rule of maximum multiplicity is the rule in atomic physics that electrons occupy equal-energy orbitals singly with parallel spins before pairing, giving the lowest-energy state.
Hund's rules
Hund's rules are three rules of atomic physics, formulated by Friedrich Hund in 1925, that identify the ground state of an atom from its electron configuration.
Hundredweight
The hundredweight (cwt) is a unit of mass in British imperial and US customary systems, equal to 112 pounds (long) or 100 pounds (short), with 20 hundredweights making a ton.
Hunger games search
Hunger games search (HGS) is a population-based metaheuristic optimization algorithm introduced by Yutao Yang and colleagues in 2021, which uses adaptive hunger weights mimicking animal foraging to find the global optimum of single-objective functions.
HURDAT
HURDAT, in its current HURDAT2 form, is the official best-track database of Atlantic tropical and subtropical cyclones maintained by NOAA's National Hurricane Center since 1851.
Hurdle model
The hurdle model is a two-part regression model for count data with many zeros, combining a binary zero/nonzero process with a zero-truncated count model for positive counts.
Huronian glaciation
The Huronian glaciation, or Makganyene glaciation, was a series of ice ages between about 2.4 and 2.1 billion years ago, the first widespread glaciation in Earth's history.
Huronian Supergroup
The Huronian Supergroup is a Paleoproterozoic succession of sedimentary and volcanic rocks along the north shore of Lake Huron, Ontario, deposited about 2.45 to 2.31 billion years ago.
Hurricane Alex (2016)
Hurricane Alex was an unusual January 2016 Atlantic hurricane, the first to form in January since 1938. It reached Category 1 strength and struck the Azores as a tropical storm.
Hurricane Allen
Hurricane Allen was a Cape Verde hurricane of August 1980 that reached Category 5 intensity three times, set the Atlantic wind record of 190 mph, and struck Texas near Brownsville.
Hurricane Analysis and Forecast System (HAFS)
The Hurricane Analysis and Forecast System (HAFS) is NOAA's next-generation hurricane forecasting model, operational since June 2023, whose storm-following nest improved track predictions by 10 to 15% in testing.
Hurricane Andrew
Hurricane Andrew, also known as Cyclone Andrew, was a Category 5 hurricane that struck the Bahamas, Florida, and Louisiana in August 1992, killing 65 people and causing about $25 billion in damage.
Hurricane Barry (2019)
Hurricane Barry was a minimal Category 1 hurricane, the first of the 2019 Atlantic season, that made landfall on the Louisiana coast on July 13, 2019, causing severe flooding.
Hurricane Beryl
Hurricane Beryl was an extremely intense 2024 Atlantic hurricane and the earliest Category 5 on record, causing catastrophic damage in Grenada and a prolonged Houston power outage.
Hurricane Betsy
Hurricane Betsy, nicknamed "Billion Dollar Betsy," was a 1965 Category 4 hurricane that flooded New Orleans and became the first US hurricane to cause over $1 billion in damage.
Hurricane Camille
Hurricane Camille was a Category 5 hurricane that struck the Mississippi Gulf Coast with 175 mph winds in August 1969, causing catastrophic flooding in Virginia.
Hurricane Carmen
Hurricane Carmen was a powerful 1974 Atlantic hurricane that peaked twice as a Category 4 and struck Louisiana as a Category 3 on September 8, causing about 150 million dollars of damage.
Hurricane Catarina
Hurricane Catarina, also called Cyclone Catarina, was a rare South Atlantic tropical cyclone that struck southern Brazil in March 2004, killing three people and causing about US$350 million in damage.
Hurricane Charley
Hurricane Charley was a small but powerful Category 4 hurricane that struck southwestern Florida on August 13, 2004, with 150 mph winds after rapidly intensifying.
Hurricane David
Hurricane David was a powerful 1979 Atlantic hurricane that devastated Dominica and struck the Dominican Republic near Santo Domingo at peak intensity, killing over 1,200 people and leaving 200,000 homeless.
Hurricane Dean
Hurricane Dean was a powerful 2007 Atlantic hurricane that struck the Yucatan Peninsula on 21 August as a category 5, the first category 5 landfall since Andrew in 1992.
Hurricane Debby
Hurricane Debby was a Category 1 hurricane, the second of the 2024 Atlantic season, that struck Florida's Big Bend in August 2024, causing 12 deaths and about $2.5 billion in damage.
Hurricane Donna
Hurricane Donna was a powerful 1960 Cape Verde hurricane that crossed the Leeward Islands, the Bahamas, the Florida Keys, and the US East Coast, killing at least 364 people.