A dust storm known as a "haboob" rolls into downtown Phoenix on Tuesday night, July 5, 2011. (AP Photo/Amanda Lee Myers)
Monsoon moisture will be on the increase across the Four Corners region this week, increasing the rain chances for the region and putting Phoenix at risk for another haboob.
A haboob is a type of intense dust storm carried by strong winds that are usually the aftermath of a thunderstorm.
Recent thunderstorms that have dotted the Four Corners region have produced more dry lightning strikes than substantial rainfall.
That will change starting Tuesday when the door is opened for monsoon moisture to start streaming northward.
The initial surge of moisture will help ignite a cluster of thunderstorms across southeastern Arizona and southern New Mexico Tuesday afternoon.
The desert areas of southern Arizona, including Phoenix, may then become the target of a haboob Tuesday night as these thunderstorms track westward. Gusty winds racing away from the thunderstorms would trigger the massive dust storms.
The added moisture in the air will also allow the thunderstorms to drop substantial rainfall Tuesday afternoon and night.
The same can be said across more of the Four Corners region as the week progresses and the monsoon moisture spills northward.
Significant rain-producing thunderstorms are definitely great news for a region where numerous wildfires are burning, but the welcome rain could come at a cost.
Too much rainfall in a short amount of time threatens to trigger flash flooding. Streams, creeks and arroyos could quickly turn into raging waterways.
Areas recently burned by wildfires are highly susceptible to not only flash flooding, but also mudslides with the severely charred soil not able to absorb the rain as quickly as normal.
Where the rain pours down on the burn areas in the mountains, the flooding rain and mud could flow down to impact the neighboring lower elevations.
Gusty winds racing away from the thunderstorms will not only be confined to the desert areas of Arizona but could also occur elsewhere across the Four Corners region. A shift or increase in wind where a wildfire is burning will create serious problems for firefighters.
AccuWeather.com meteorologists will also be monitoring the potential for some of the thunderstorms to turn severe with damaging winds.
The focus for severe storms will move into the Ohio Valley and resume over New York state on Wednesday.
So far this year California has seen 1,569 wildfires, 85 percent more than in an average year.
The Memorial Day weekend will begin cool, windy and rainy in New England and part of the mid-Atlantic.
GOES-East failed again late Tuesday. It is one of the main satellites meteorologists use for the eastern part of the United States and the tropical Atlantic.
Severe storms are shifting eastward Wednesday afternoon delivering strong wind, heavy rain and hail.
On the two-year anniversary of the EF-5 tornado that leveled Joplin, Mo., the town has deployed assistance to Moore, Okla.
| Extreme | Location | |
|---|---|---|
| High | N/A | |
| Low | N/A | |
| Precip | N/A |
Southwestern & Central OK (1996)
Sinking air from dying thunderstorms cause
unusual late night rise in temperature. Many
places rose from upper 80s at 11:00PM to near
100 degrees by 3:00AM.
San Antonio, TX (1998)
Very dry since April 1st - only 0.05 of rain.
Liberal, KS (1933)
A powerful F4 tornado (winds 207-260 mph)
hidden in a dust storm devastates the business
district. 4 people were killed and 150 were
injured. Tornado estimated to be 600 yards
wide at times.
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