Significant rainfall is expected to impact the Desert Southwest as the remnants of former Hurricane Priscilla merge with an incoming storm system. This combination could lead to more precipitation than typically seen in October, potentially affecting some of the driest areas in the United States.
Impact of Former Hurricane Priscilla
Priscilla, downgraded to a tropical storm, is set to release an abundance of moisture into the atmosphere. This anomaly is likely to enhance rainfall across the Southwest United States. Moist air from Priscilla will interact with a weather system influenced by a dip in the jet stream along the West Coast.
- Heavy rains are expected to start by Thursday and Friday.
- The regions affected include Arizona, southeast California, and the Four Corners area.
- Peak rainfall is anticipated on Friday and Saturday.
Potential Flooding Concerns
The influx of moisture could lead to flash flooding, particularly in low-lying areas. Local waterways such as washes and small streams are likely to swell rapidly, necessitating caution for residents and travelers in the vicinity.
Rainfall totals may surpass the entire October average in various locations. In Phoenix, the average typically hovers just above half an inch, while Flagstaff would need about an inch and a half to meet monthly expectations.
- Recent rainfall patterns show Phoenix recorded approximately 2.26 inches in September, almost quadrupling its average.
- Flash floods in Globe, Arizona, resulted in significant damages and loss of life, reflecting the severity of sudden downpours.
Forecasted Rainfall Totals
The heaviest totals, projected to reach 3 to 4 inches, are expected in northern Arizona. Current predictions place a Level 2 out of 4 flood threat for areas in:
- Arizona
- Northwest New Mexico
- Southeast Utah
- Southwest Colorado
Future Weather Systems
Looking ahead, another Eastern Pacific tropical system could further complicate the weather in the Southwest. Forecasts suggest this system may bring additional rain from Sunday into Monday, particularly affecting regions such as Tucson and parts of New Mexico.
As the situation evolves, it is vital to stay informed about local weather updates and advisories to mitigate risks associated with flash flooding.
