North American Monsoon

monsoonmonsoonalmonsoon seasonthe monsoonThe monsoon seasondesert monsoondesert rainstormmonsoon season in New Mexico and southern Arizonamonsoon stormsmonsoon-season
The North American monsoon, variously known as the Southwest monsoon, the Mexican monsoon, the New Mexican monsoon, or the Arizona monsoon, is a pattern of pronounced increase in thunderstorms and rainfall over large areas of the southwestern United States and northwestern Mexico, typically occurring between July and mid September.wikipedia
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Monsoon

southwest monsoonmonsoonsnortheast monsoon
The North American monsoon, variously known as the Southwest monsoon, the Mexican monsoon, the New Mexican monsoon, or the Arizona monsoon, is a pattern of pronounced increase in thunderstorms and rainfall over large areas of the southwestern United States and northwestern Mexico, typically occurring between July and mid September.
The inclusion of the North and South American monsoons with incomplete wind reversal has been debated.

Arizona

AZState of ArizonaArizona, U.S.
The monsoon begins in late May to early June in southern Mexico and quickly spreads along the western slopes of the Sierra Madre Occidental, reaching Arizona and New Mexico in early July.
Arizona has an average annual rainfall of 12.7 in, which comes during two rainy seasons, with cold fronts coming from the Pacific Ocean during the winter and a monsoon in the summer.

Thunderstorm

thunderstormssevere thunderstormelectrical storm
During the monsoon, thunderstorms are fueled by daytime heating and build up during the late afternoon-early evening.
In spring and summer, they occur nearly daily in certain areas of the Rocky Mountains as part of the North American Monsoon regime.

Southwestern United States

American SouthwestSouthwestSouthwestern
The North American monsoon, variously known as the Southwest monsoon, the Mexican monsoon, the New Mexican monsoon, or the Arizona monsoon, is a pattern of pronounced increase in thunderstorms and rainfall over large areas of the southwestern United States and northwestern Mexico, typically occurring between July and mid September.

Mexico

MexicanMéxicoMEX
The North American monsoon, variously known as the Southwest monsoon, the Mexican monsoon, the New Mexican monsoon, or the Arizona monsoon, is a pattern of pronounced increase in thunderstorms and rainfall over large areas of the southwestern United States and northwestern Mexico, typically occurring between July and mid September.

Sierra Madre Occidental

Sierra MadreSierra Madre MountainsSierra Madres
Geographically, the North American monsoon precipitation region is centered over the Sierra Madre Occidental in the Mexican states of Sinaloa, Durango, Sonora and Chihuahua.

Sinaloa

Sinaloa, MexicoStateEstado Libre y Soberano de Sinaloa
Geographically, the North American monsoon precipitation region is centered over the Sierra Madre Occidental in the Mexican states of Sinaloa, Durango, Sonora and Chihuahua.

Durango

State of DurangoDurango, Mexicoa state in Mexico called Durango
Geographically, the North American monsoon precipitation region is centered over the Sierra Madre Occidental in the Mexican states of Sinaloa, Durango, Sonora and Chihuahua.

Sonora

Sonora, MexicoSonoranSonora State
Geographically, the North American monsoon precipitation region is centered over the Sierra Madre Occidental in the Mexican states of Sinaloa, Durango, Sonora and Chihuahua.

Chihuahua (state)

ChihuahuaChihuahua, Mexicostate of Chihuahua
Geographically, the North American monsoon precipitation region is centered over the Sierra Madre Occidental in the Mexican states of Sinaloa, Durango, Sonora and Chihuahua.

Monsoon of South Asia

monsoonIndian monsoonmonsoon season
The North American Monsoon is not as strong or persistent as its Indian counterpart, mainly because the Mexican Plateau is not as high or as large as the Tibetan Plateau in Asia.

Mexican Plateau

Mesa CentralCentral Mexican PlateauMexican Altiplano
The North American Monsoon is not as strong or persistent as its Indian counterpart, mainly because the Mexican Plateau is not as high or as large as the Tibetan Plateau in Asia.

Tibetan Plateau

Qinghai-Tibet PlateauQinghai-Tibetan PlateauQinghai–Tibet Plateau
The North American Monsoon is not as strong or persistent as its Indian counterpart, mainly because the Mexican Plateau is not as high or as large as the Tibetan Plateau in Asia.

New Mexico

NMState of New MexicoNew Mexican
The monsoon begins in late May to early June in southern Mexico and quickly spreads along the western slopes of the Sierra Madre Occidental, reaching Arizona and New Mexico in early July.

High-pressure area

high pressurehigh pressure areahigh pressure system
It extends into the southwest United States as it matures in mid-July, when an area of high pressure, called the monsoon or subtropical ridge, develops in the upper atmosphere over the Four Corners region, creating wind flow aloft from the east or southeast.

Horse latitudes

subtropical ridgesubtropical anticyclonesubtropical high
It extends into the southwest United States as it matures in mid-July, when an area of high pressure, called the monsoon or subtropical ridge, develops in the upper atmosphere over the Four Corners region, creating wind flow aloft from the east or southeast.

Four Corners

Four Corners Region4 CornersFour Corners, NM, AZ, UT, & CO
It extends into the southwest United States as it matures in mid-July, when an area of high pressure, called the monsoon or subtropical ridge, develops in the upper atmosphere over the Four Corners region, creating wind flow aloft from the east or southeast.

Thermal low

heat lowAsiatic lowlow pressure
At the same time, a thermal low (a trough of low pressure from intense surface heating) develops over the Mexican Plateau and the Desert Southwest of the United States.

Gulf of California

Sea of CortezSea of CortésCortezian
Pulses of low level moisture are transported primarily from the Gulf of California and eastern Pacific.

Pacific Ocean

PacificSouth PacificWestern Pacific
Pulses of low level moisture are transported primarily from the Gulf of California and eastern Pacific.

Gulf of Mexico

GulfGulf CoastMexican Gulf
Upper level moisture is also transported into the region, mainly from the Gulf of Mexico by easterly winds aloft.

Evapotranspiration

potential evapotranspirationevaporationevapotranspired
Once the forests of the Sierra Madre Occidental green up from the initial monsoon rains, evaporation and plant transpiration can add additional moisture to the atmosphere which will then flow into Arizona.

Tropical wave

easterly wavetropical wavestropical disturbance
This activity is occasionally enhanced by the passage of tropical waves and the entrainment of the remnants of tropical cyclones.

Entrainment (meteorology)

entrainmententrainedentrain
This activity is occasionally enhanced by the passage of tropical waves and the entrainment of the remnants of tropical cyclones.

Tropical cyclone

hurricanetropical stormhurricanes
This activity is occasionally enhanced by the passage of tropical waves and the entrainment of the remnants of tropical cyclones.