|
June 1990 Lower Ohio Valley Tornado Outbreak
The June 1990 Lower Ohio Valley tornado outbreak spawned 65 tornadoes, including seven of F4 intensity, in southern Illinois, central and southern Indiana, southwestern Ohio, and northern Kentucky on June 2–3, 1990. In Indiana, 37 tornadoes formed, breaking the single-day record of 21 set during the Super Outbreak on April 3, 1974. Meteorological synopsis On June 2, an unseasonably intense surface low over eastern North Dakota brought with it a cold front across the Mississippi Valley. Ahead of the front, a highly unstable air mass combined with a strong jet stream that increased the synoptic-scale lifting favoring supercell development. Meanwhile, backed southerly low-level winds brought moist dew points well into the region. The National Severe Storms Forecast Center in Norman, Oklahoma, put out a high risk for severe weather over much of Illinois, Indiana, Ohio, and northern Kentucky. A notable feature of this outbreak is that there was a sector of weak tornadoes no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Midwestern United States
The Midwestern United States, also referred to as the Midwest or the American Midwest, is one of four census regions of the United States Census Bureau (also known as "Region 2"). It occupies the northern central part of the United States. It was officially named the North Central Region by the Census Bureau until 1984. It is between the Northeastern United States and the Western United States, with Canada to the north and the Southern United States to the south. The Census Bureau's definition consists of 12 states in the north central United States: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, and Wisconsin. The region generally lies on the broad Interior Plain between the states occupying the Appalachian Mountain range and the states occupying the Rocky Mountain range. Major rivers in the region include, from east to west, the Ohio River, the Upper Mississippi River, and the Missouri River. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Supercell
A supercell is a thunderstorm characterized by the presence of a mesocyclone: a deep, persistently rotating updraft. Due to this, these storms are sometimes referred to as rotating thunderstorms. Of the four classifications of thunderstorms (supercell, squall line, multi-cell, and single-cell), supercells are the overall least common and have the potential to be the most severe. Supercells are often isolated from other thunderstorms, and can dominate the local weather up to away. They tend to last 2–4 hours. Supercells are often put into three classification types: classic (Normal precipitation level), low-precipitation (LP), and high-precipitation (HP). LP supercells are usually found in climates that are more arid, such as the high plains of the United States, and HP supercells are most often found in moist climates. Supercells can occur anywhere in the world under the right pre-existing weather conditions, but they are most common in the Great Plains of the United State ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iowa
Iowa () is a state in the Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wisconsin to the northeast, Illinois to the east and southeast, Missouri to the south, Nebraska to the west, South Dakota to the northwest, and Minnesota to the north. During the 18th and early 19th centuries, Iowa was a part of French Louisiana and Spanish Louisiana; its state flag is patterned after the flag of France. After the Louisiana Purchase, people laid the foundation for an agriculture-based economy in the heart of the Corn Belt. In the latter half of the 20th century, Iowa's agricultural economy transitioned to a diversified economy of advanced manufacturing, processing, financial services, information technology, biotechnology, and green energy production. Iowa is the 26th most extensive in total area and the 31st most populous of the 50 U.S. states, with a populat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Van Buren County, Iowa
Van Buren County ( ) is a County (United States), county located in the U.S. state of Iowa. As of the 2020 United States Census, 2020 census the population was 7,203, making it the state's tenth-least populous county. The county seat is Keosauqua, Iowa, Keosauqua, which contains the oldest continuously operational Van Buren County Courthouse (Iowa), courthouse in the state of Iowa, and second oldest in the United States. History Van Buren County was formed on December 7, 1836, as a part of Wisconsin Territory, and was split off from Des Moines County, Iowa, Des Moines County. It was named for President Martin Van Buren. It became a part of Iowa Territory (later the state of Iowa) when that territory was organized on July 4, 1838. The county's courthouse was built in September 1843 in the style of Greek Revival and stands as Iowa's oldest, and the nation's second oldest, courthouse in operation. "The Honey War" refers to a colorful episode in Van Buren County's history when th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cantril, Iowa
Cantril is a city in Van Buren County, Iowa, United States. The population was 224 at the 2020 census. History Cantril was laid out in 1871. Geography According to the United States Census Bureau, the city has a total area of , all land. Demographics 2010 census As of the census of 2010, there were 222 people, 104 households, and 59 families residing in the city. The population density was . There were 118 housing units at an average density of . The racial makeup of the city was 98.6% White, 0.5% Asian, 0.5% Pacific Islander, and 0.5% from other races. Hispanic or Latino of any race were 0.5% of the population. There were 104 households, of which 22.1% had children under the age of 18 living with them, 45.2% were married couples living together, 6.7% had a female householder with no husband present, 4.8% had a male householder with no wife present, and 43.3% were non-families. 40.4% of all households were made up of individuals, and 25% had someone living alone who was 65 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coordinated Universal Time
Coordinated Universal Time or UTC is the primary time standard by which the world regulates clocks and time. It is within about one second of mean solar time (such as UT1) at 0° longitude (at the IERS Reference Meridian as the currently used prime meridian) and is not adjusted for daylight saving time. It is effectively a successor to Greenwich Mean Time (GMT). The coordination of time and frequency transmissions around the world began on 1 January 1960. UTC was first officially adopted as CCIR Recommendation 374, ''Standard-Frequency and Time-Signal Emissions'', in 1963, but the official abbreviation of UTC and the official English name of Coordinated Universal Time (along with the French equivalent) were not adopted until 1967. The system has been adjusted several times, including a brief period during which the time-coordination radio signals broadcast both UTC and "Stepped Atomic Time (SAT)" before a new UTC was adopted in 1970 and implemented in 1972. This change also a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Time Zone
A time zone is an area which observes a uniform standard time for legal, Commerce, commercial and social purposes. Time zones tend to follow the boundaries between Country, countries and their Administrative division, subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time. All time zones are defined as offsets from Coordinated Universal Time (UTC), ranging from UTC−12:00 to UTC+14:00. The UTC offset, offsets are usually a whole number of hours, but a few zones are offset by an additional 30 or 45 minutes, such as in Indian Standard Time, India, Time in Australia, South Australia and Nepal Time, Nepal. Some areas of higher latitude use daylight saving time for about half of the year, typically by adding one hour to local time during spring (season), spring and summer. List of UTC offsets In the table below, the locations that use daylight saving time (DST) are listed in their UTC offse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicity (particle Physics)
In physics, helicity is the projection of the spin onto the direction of momentum. Overview The angular momentum J is the sum of an orbital angular momentum L and a spin S. The relationship between orbital angular momentum L, the position operator r and the linear momentum (orbit part) p is :\mathbf = \mathbf\times\mathbf so L's component in the direction of p is zero. Thus, helicity is just the projection of the spin onto the direction of linear momentum. The helicity of a particle is positive (" right-handed") if the direction of its spin is the same as the direction of its motion and negative ("left-handed") if opposite. Helicity is conserved. That is, the helicity commutes with the Hamiltonian, and thus, in the absence of external forces, is time-invariant. It is also rotationally invariant, in that a rotation applied to the system leaves the helicity unchanged. Helicity, however, is not Lorentz invariant; under the action of a Lorentz boost, the helicity may chang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terre Haute, Indiana
Terre Haute ( ) is a city in and the county seat of Vigo County, Indiana, United States, about 5 miles east of the state's western border with Illinois. As of the 2010 census, the city had a population of 60,785 and its metropolitan area had a population of 170,943. Located along the Wabash River, Terre Haute is one of the largest cities in the Wabash Valley and is known as the Queen City of the Wabash. The city is home to multiple higher-education institutions, including Indiana State University, Rose-Hulman Institute of Technology, and Ivy Tech Community College of Indiana. History Terre Haute's name is derived from the French phrase ''terre haute'' (pronounced in French), meaning "highland". It was named by French-Canadian explorers and fur trappers to the area in the early 18th century to describe the unique location above the Wabash River (see French colonization of the Americas). At the time, the area was claimed by the French and British and these highlands were consid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Severe Weather
Severe weather is any dangerous meteorological phenomenon with the potential to cause damage, serious social disruption, or loss of human life. Types of severe weather phenomena vary, depending on the latitude, altitude, topography, and atmospheric conditions. High winds, hail, excessive precipitation, and wildfires are forms and effects of severe weather, as are thunderstorms, downbursts, tornadoes, waterspouts, tropical cyclones, and extratropical cyclones. Regional and seasonal severe weather phenomena include blizzards (snowstorms), ice storms, and duststorms. Extreme weather phenomena which cause extreme heat, cold, wetness or drought often will bring severe weather events. One of the principal effects of anthropogenic climate change is changes in severe and extreme weather patterns. Terminology Meteorologists have generally defined severe weather as any aspect of the weather that poses risks to life, property or requires the intervention of authorities. A narrower ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of SPC High-risk Days
A high risk severe weather event is the greatest threat level issued by the Storm Prediction Center (SPC) for convective weather events in the United States. On the scale from 1 to 5, a high risk is a level 5; thus, high risks are issued only when forecasters at the SPC are confident of a major severe weather outbreak. This is usually for major tornado outbreaks and occasionally derechos and are typically reserved for the most extreme events. They are generally only issued on the day of the event. However, only 2 occurrences (April 7, 2006, and April 14, 2012) of a day 2 high risk are known. A high risk cannot be issued on day 3. High Risk Days 1982–1989 Thirty-four high risks were issued in the 1980s. 1990–1999 Sixty high risks were issued in the 1990s. 2000–2009 There were no high risk days in 2000. 2010–2019 There were no high risk days in 2015, 2016, or 2018. 2020–present There were no high risk days in 2020 or 2022. See also * List of deadliest Storm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norman, Oklahoma
Norman () is the third-largest city in the U.S. state of Oklahoma, with a population of 128,097 as of 2021. It is the largest city and the county seat of Cleveland County, Oklahoma, Cleveland County, and the second-largest city in the Oklahoma City metropolitan area, behind the state capital, Oklahoma City. It is 20 miles (32 kilometers) south of OKC, OK, OKC. Norman was settled during the Land Run of 1889, which opened the former Unassigned Lands of Indian Territory to American pioneer settlement. The city was named in honor of Abner Norman, the area's initial land surveyor, and was formally incorporated on , 1891. Norman has prominent higher education and related research industries, as it is home to the University of Oklahoma, the largest university in the state, with nearly 32,000 students. The university is well known for its sporting events by teams under the banner of the nickname Oklahoma Sooners, "Sooners," with over 85,000 people routinely attending American football, f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
