Tropical Storm Rachel will drench the West this weekend with heavy rain and gusty winds, a level 2 flash flood threat runs from Southern California to Utah.
Rachel weakened slightly Thursday morning and was downgraded to a tropical storm as it continued moving through the East Pacific. FOX Weather reports the system will keep weakening as it approaches Southern California and Mexico, losing its tropical characteristics while the moisture plume remains intact.
That leftover moisture is the real story for residents on the ground. A broad dip in the jet stream across the Western United States is expected to shift the steering winds and shove Rachel’s moisture east across Southern California into the Southwest this weekend.
Rain is forecast to start Saturday across portions of California and the Southwest. The flash flood threat really starts to ramp up Sunday.
The FOX Forecast Center has a level 2 out of 4 flash flood threat in effect for a large area running from Southern California all the way to Utah. Phoenix and Las Vegas sit inside that threat zone.
Two to three inches of rain is possible in the flash flood threat areas, the forecast center said. For desert cities and dry washes that can turn dangerous fast, those totals are enough to matter.
California stands to gain some relief as well. The same moisture that raises flood risk also brings beneficial rain that can ease the heat across the state.
Earlier Pacific systems already showed how leftover tropical moisture can hammer the region, including when Polo’s remnants sparked Southwest flash floods and forced evacuations.
Higher elevations of the Sierra Nevada could see some of that moisture fall as snow. Farther north, the plume is expected to help fuel a fall snowstorm across Montana and northern Wyoming, with impacts also noted for the Northwest.
The setup is driven by that jet-stream dip over the West Coast and Western U.S. As steering winds change, Rachel does not need to stay a strong tropical cyclone to deliver trouble. The moisture is what travels inland.
Forecast graphics referenced with the outlook include the storm’s cone, the flash flood outlook, and the West rain forecast. The core message is steady: weaker storm, lasting moisture, weekend impacts.
Track watchers have followed this system as it evolved, including coverage of how weakening Rachel pivoted toward Mexico while still raising surf danger for California.
Hurricane specialist Bryan Norcross has separate analysis tied to the broader Pacific picture. The immediate public concern remains the weekend rain band, wind, and flood threat across the Southwest corridor.
Rachel is not the only East Pacific system on the board. Tropical Storm Simon is forecast to strengthen into a hurricane and make landfall in Mexico this weekend as it moves parallel to the Mexican coastline.
That means the same stretch of calendar could bring land impacts from more than one tropical moisture source. Rachel’s contribution is the inland plume into California, the Southwest, and Utah. Simon’s threat centers on Mexican landfall hazards.
The season’s Pacific pipeline has repeatedly fed U.S. flood risk, a pattern noted when Rachel was earlier expected to strengthen and send moisture toward the United States.
A separate Gulf system, Hurricane Isaias, has been tracked as a landfall threat for Gulf cities with expanding evacuation orders in related coverage. That storm is a different basin and a different problem set from Rachel’s West Coast moisture push.
Thursday’s downgrade does not cancel the forecast. The storm continues weakening on approach, yet the rain timeline holds: Saturday start, Sunday escalation, impacts through the weekend.
Drivers, outdoor workers, and local officials across Southern California, Arizona, Nevada, and Utah have a short window to prepare for slick roads, rising water, and gusty winds. Desert drainage and burn-scar hillsides can respond quickly once the heavier rain arrives.
Broader Pacific moisture events have put huge populations under extended flood alerts before, including periods with more than 150 million under weeklong flood threat as storms shoved moisture across dozens of states.
The same Southwest flood buildup showed up when Hurricane Polo neared Baja landfall and Rachel was first taking shape in the basin.
Absolute calendar dates and precise storm intensity numbers were not pinned down beyond the relative Thursday-through-weekend framework in the forecast report. What is clear is the sequence: weaker tropical storm, intact moisture, Saturday rain onset, Sunday flood-threat increase, and a level 2 flash flood risk from Southern California to Utah.
When tropical leftovers aim at dry country, the smart play is simple, treat the forecast seriously, clear the drains, and keep people out of flood-prone roads before the water rises.
