A building weather pattern in the West will bring needed rainfall, but also the risk of flooding, dust storms and wildfires to some locations.
The developing pattern over the western United States favors the expanse of an annual phenomenon known to locals as "The Monsoon."
The monsoon favors thunderstorms that bring localized torrential rainfall and also those without much rain, but deliver frequent lightning strikes and gusty winds.
Increasing humidity levels have resulted in an uptick in the number and expanse of thunderstorms.
While the storms bring life-giving rainfall to normally arid areas of the region, they also bring the risk of flash flooding and the ignition of new wildfires.
The risk of flash flooding and debris flows are multiplied over areas that have been recently scorched by wildfires.
According to Paul Pastelok, head of the AccuWeather.com long-range forecast team, "Initially the thunderstorms will focus over the Four Corners states but will expand outward to the West, this week into next week."
At the local level, it is impossible to say which areas will be hit by rainfall sufficient enough to cause flooding and which places could be facing dry lightning and new wildfires.
"The area from northern California to eastern Oregon, eastern Washington and northern Idaho will remain relatively free of storms over the next couple of weeks," Pastelok said.
A disturbance is forecast to drift westward across northern Mexico next week. After a lull, the flow around this disturbance will again boost the coverage and intensity of the storms over the Southwest.
"The disturbance is likely to enhance the thunderstorm activity within the monsoon pattern from the southern Plains and West Texas to Colorado, New Mexico, Utah and Arizona," Pastelok added.
Similar setups in the past have resulted in torrential rainfall and flooding.
However, even before that disturbance arrives, some downpours will reach these areas.
According to Western Weather Expert Ken Clark, "We expect thunderstorms to continue to erupt around Phoenix and Las Vegas this week, as well as some of the desert areas in California."
While the storms bring a risk of starting new fires, the high humidity works as an aid to firefighters. The higher moisture makes the brush more moist. The more moist brush make it a bit more difficult for existing fires to spread rapidly and lowers the chance of a lightning strike starting a new fire.
Sporadic downpours may also serve as a natural firebreak.
Isolated torrential rainfall caused by the storms can also be very dangerous. A storm miles away can lead to a flash flood hours later downstream. Dry stream beds in the region, called Arroyos, can rapidly fill with water, sweeping away unsuspecting motorists and children playing in the vicinity.
Some of the storms that bring little or no rainfall can also kick up a considerable amount of dust, which can pose another sudden problem for travelers in the region.
For much of the Southwest, the monsoon-driven thunderstorms represent the bulk of the moisture received on an annual basis. Few winter storms release as much moisture as a single, drenching thunderstorm. Much of that winter moisture falls in the form of snow over the mountains.
According to the National Interagency Fire Center, during 2012 there were 67,774 wildland fires across the nation, which burned 9.3 million acres. As of July 8, for the year so far, there have been nearly 25,000 wildland fires, which have burned 1.9 million acres.
"The prime fire season for the West in general spans August to October," Clark stated. "During September and October, Santa Ana winds and hot weather are a particular problem in Southern California."
By the late summer and early autumn, vegetation has had all summer to dry out.
Last year, drought over the Plains, Midwest and in parts of the East and South during the winter, spring and early summer contributed to a high number of fires early on. This year so far much of the same area has been abnormally wet, which has contributed to a lower number of fires nationally.
While conditions are likely to stay wet in much of the Eastern and Central states into the summer, the national number of wildland fires, driven by conditions in the West will tend to catch up to last year's levels.
The first widespread ice storm of the season will slowly diminish over parts of the southern and central Plains, but areas of slippery travel will continue into early Monday.
Summer-like heat will be short-lived eastern Australia early this week in advance of a cold front.
The reprieve from heavy rain across southern India will not last with the threat for flooding downpours set to return for the final day of November.
After another brief shot of chilly air over the weekend, the month of December will start out milder across the Northeast.
December will begin with a roar across the Northwest as rounds of rain, mountain snow and even ice are in store for late this week.
November 1972 was one of the wettest on record for the Northeastern U.S. As of the 27th, NYC had its wettest November ever with 11.36 inches. This broke the old record of 9.97 inches. Binghamton, NY, had a monthly total of 7.11 inches -- the wettest November in the 75-year history of record keeping at Broome County Airport. Binghamton also had 19.4 inches of snow -- exactly a foot above normal.
Minneapolis, MN (1983)
With 13 inches from the latest storm - set new monthly record snow for snow with 29 inches. This record was broken during November 1991.
Tropical Storm Karen brought wind and flooding rains to western Cuba.