The surviving tropical population of primates, which is seen most completely in the upper Eocene and lowermost Oligocene fossil beds of the Faiyum depression southwest of Cairo, gave rise to all living species — lemurs of Madagascar, lorises of Southeast Asia, galagos or " bush babies " of Africa, and the anthropoids: platyrrhine or New World monkeys, catarrhines or Old World monkeys, and the great apes, including humans.

It started life tracking across the Atlantic as a tropical depression and tropical storm in the normal direction ( east to west ).

Almost all rain comes from monsoon thunderstorms, or the occasional tropical cyclone rain depression.

The next day, the system gained sufficient organization to become a tropical depression.

The depression moved westward in excess of, and reached tropical storm strength-becoming Tropical Storm Lili as it passed through the Windward Islands.

By gaining tropical characteristics, an extratropical low may transit into a subtropical depression or storm.

A subtropical depression / storm may further gain tropical characteristics to become a pure tropical depression or storm, which may eventually develop into a hurricane, and there are at least four cases of tropical storms transforming into a subtropical storm ( Hurricane Klaus in 1984, Tropical Storm Allison in 2001 and Tropical Storm Lee in 2011.

Generally, a tropical storm or tropical depression is not called subtropical while it is becoming extratropical, after hitting either land or colder waters.

Occasionally, a hurricane that has made landfall in the Gulf of Mexico will reach Fort Payne as a tropical storm or tropical depression.

: Tropical cyclones form in the oceans if the conditions in the area are favorable, and depending on their strength and location, there are various terms by which they are called, such as tropical depression, tropical storm, hurricane and typhoon.

alt = A color-coded chart shows that Hurricane Agnes began as a tropical depression over the Yucatán Peninsula in Mexico, turned sharply northward and became a tropical storm after entering the Caribbean Sea.

It gained hurricane strength as it crossed the Gulf of Mexico but weakened to a tropical depression again after striking the U. S. mainland and turning to the northeast.

::-A United States Navy rocket captures a picture of an inland tropical depression near the Texas / Mexico border, which leads to a surprise flood event in New Mexico.

It weakened to a tropical depression over land, but restrengthened to a tropical storm over the southeastern Gulf of Mexico.

Moving on a steady westward track at 18 knots ( 21 mph, 33 k / h ), Tropical Depression Eleven steadily intensified, becoming a tropical storm on September 11 at 1800 UTC ; it received the name Hugo.

Under weak steering currents, it drifted westward and intensified into a tropical storm on October 23 while 260 mi ( 420 km ) east-southeast of San Andrés Island.

As Mitch accelerated to the northeast in association with a cold front, it gradually intensified, and made landfall near Naples, Florida on November 5 as a tropical storm with 65 mph ( 100 km / h ) winds.

Upon first being classified as a tropical cyclone, Camille was located in an area favorable for further strengthening, although initially it slowly intensified.

Within the North Atlantic ocean, tropical or subtropical cyclones are named by the National Hurricane Center ( NHC / RSMC Miami ) when they are judged to have intensified into a tropical storm with winds of at least 65 km / h, ( 40 mph ).

Shortly after Hortense intensified into a tropical storm, a tropical storm warning was issued by the respective governments from Martinique to the United States Virgin Islands.

During the afternoon of August 27, the depression intensified further, becoming a tropical storm and receiving the name Fran.

A gradual strengthening period began, and a Hurricane Hunters aircraft had found that the tropical wave had intensified to a tropical depression on October 29.

Late on August 28, it was estimated that the depression intensified into a tropical storm.

Arlene rapidly intensified that day to become a 100 mph ( 155 km / h ) Category 2 hurricane, but lack of outflow weakened Arlene to a tropical depression on August 4.

Becky rapidly intensified after becoming a tropical storm, and reached hurricane status only six hours later.

This storm, named Bravo, gradually intensified, becoming fully tropical, at which time it was renamed Fran, a few days later.

The following day, the system intensified into a tropical depression and shortly thereafter became a tropical storm as reconnaissance aircraft recorded gale-force winds.

By September 3, the depression had intensified into a tropical storm, receiving the name Delia, and began tracking more towards the west.

Tracking northeast, the system intensified into a tropical storm on September 15 after sustained winds of 45 mph ( 75 km / h ) were reported by a French navel vessel ; however, due to sparse data on the storm, the first advisory on Ellen was not issued for two more days.

The wave had intensified and broadened by August 25, and it eventually split into two components, the northernmost of which consolidated into an organized storm system .< ref > Moving westward, the system developed into a tropical depression on August 29, more than east of Guadeloupe.

While tracking east-northeastward at more than, the tropical storm intensified into a hurricane at 1200 UTC on June 19.

Conditions were favorable for intensification, and Inez rapidly intensified the next day, reaching Category 3 strength while passing through the islands, with the center of the hurricane passing directly over Guadeloupe, where tropical storm-force winds extended 125 miles from the center as hurricane-force winds extended 60 miles from the center.

The tropical storm, now named Frances, further intensified on August 26 in an environment of low vertical wind shear as its track bent to the west-northwest.

Initially forming as a tropical depression, the storm headed slowly eastward and emerged into the western Caribbean Sea on June 15.

Initially a tropical depression, it headed westward without significant strengthening for four days due to unfavorable upper-level winds.

A tropical wave exited the west coast of Africa on July 22 and headed toward the Leeward Islands, where the system nearly developed into a tropical cyclone.

It headed to the west, becoming a tropical storm on August 2.

It headed west-northwestward, reaching tropical storm strength on the July 24.

On September 1, a tropical wave moved off the coast of Africa and headed westward.

Frances headed inland, weakening to a tropical depression and causing heavy rainfall over the southern and eastern United States.

Discovered as a strengthening tropical storm in late August, Storm Four headed northwest toward the East Coast of the United States.

The disturbance was the precursor to a tropical depression which developed over the southern Bahamas and headed west-southwestward across Cuba, where, at Havana, winds blew from the southeast at.

The tropical storm then headed towards the northwest.

It initially headed westward and strengthened into a tropical storm the same day it formed.

It headed north and peaked as a minimal tropical storm on October 1.

On October 27, a tropical depression formed and headed northwest, gradually re-curving north.

Without further strengthening, it weakened into a tropical depression, headed north northeast, and dissipated on October 31 about east of the southern tip of Baja California.

A tropical disturbance was first observed about 208 mi ( 334 km ) south of the coast of Guatemala, and headed westward.

A tropical disturbance headed westward into the Pacific, after crossing Central America on August 26 to August 27.

A tropical disturbance developed within the ITCZ during October, and headed over sea surface temperatures of at least 84 ° F ( 29 ° C ).

As the storm headed northeastward, the hurricane began to weaken, becoming a tropical storm by June 21.

The tropical storm headed directly eastward on October 19, and dissipated in the open Atlantic on October 20.

After a three month lull, a tropical storm formed east of the Lesser Antilles on September 8, headed northwestward, and eventually hit the Myrtle Beach area as a Category 1 hurricane on September 14.

A depression formed July 21 from squalls in the Gulf of Tehuantepec and headed west-northwest and strengthened into a tropical storm.

After moving northwest for a bit, it became a tropical storm and headed almost due north towards Mexico.