The remnants of Hurricane Rosa are forecast to bring heavy rain and the threat of flash flooding to the Southwest over the next few days. The now-tropical storm – which had been as strong as a Category 4 hurricane – is poised to make landfall along Mexico’s Baja California Peninsula on Monday evening, where heavy rain was already being reported.
Southern California got ready Monday for the first storm of the new rain season, due midweek, while also preparing for possible debris flows as the threatening remnants of tropical storm Rosa rolled through the mountain and desert areas. For a time Monday afternoon, authorities issued a voluntary flood evacuation for San Jacinto Mountain communities in the area of the Cranston fire that burned near Idyllwild as Rosa’s clouds headed north from Baja. That voluntary evacuation notice was lifted early Monday evening.
While most of California will miss out on Rosa’s soaking rain, a storm on its heels will bring the first measurable rain since May to San Francisco, Los Angeles and other cities Tuesday into Wednesday. In California, the rain and flood risk associated with Rosa is expected to remain confined to the state’s southeastern corner early this week. Rough seas stirred up by Rosa will still continue to plague Southern California through Monday. Rip currents can endanger surfers or anyone who attempts to enter the water, and minor coastal flooding may occur at high tide.
he final figures won’t be available until midnight. But San Diego will end the current rainy season (October 1-September 30) with roughly 3.34 inches of precipitation, which is 7 inches below average, says the National Weather Service. The deficit is even bigger in Ramona, which recorded approximately 5.80 inches of rain, which is 10.24 inches below average.
Light showers could hit parts of Los Angeles County beginning late Monday as a low pressure system moves onshore, with some areas across the region expected to get up to an inch of rain on Tuesday, forecasters say. The eastern end of Los Angeles County, including Azusa, could get less than a 10th of an inch of rain starting Monday after 6 p.m., said Kathy Hoxsie, a meteorologist with the National Weather Service. A slight chance of isolated thunderstorms is also forecast.
The remnants of Hurricane Rosa were expected to drop rain in the San Diego region Monday, a National Weather Service forecaster said. The storm already brought higher-than-normal surf levels to the coasts Saturday night. The waves were expected to peak Sunday night through Monday evening, before decreasing into Tuesday, according to the National Weather Service. Waves of three to five feet with sets to seven feet were predicted for San Diego County beaches, the NWS said. The swell direction was expected to give south-facing beaches the highest surf, such as Coronado and the Orange County coast.
San Diego County could get its first substantial rain since March early next week. Or not. The remains of Hurricane Rosa, a major hurricane with 125 mph winds southwest of the southern tip of the Baja Peninsula on Thursday night, are expected to drift northward. By Monday, Rosa should be downgraded to a tropical storm. By Tuesday, much of its moisture, if not its tropical-storm-force winds, should move into or close to Southern California.
After a truly searing start to summer across most of California, especially in the south, the last several weeks have felt rather mild by comparison. The record-breaking heatwaves of July, followed by record warm ocean temperatures later in the summer in SoCal, made for very uncomfortable conditions across some of California’s most densely populated regions for much of the summer. Meanwhile, in interior NorCal, record daytime highs were few and far between–but relentless overnight warmth and persistently above-average daytime temperatures again combined to produce record or near-record summer temperatures. Indeed: across many parts of southern and interior California, 2018 was the warmest summer on record.
After a warm September for millions of Americans, October is expected to feel much more fall-like across the north-central and northeastern United States, but the chilly weather may be replaced by milder temperatures for the start of winter. Near- or below-average temperatures are expected in October from the northern Plains into the Midwest and Northeast, according to the latest outlook from The Weather Company, an IBM Business. The greatest chance for colder-than-average temperatures will be in the upper Midwest, western Great Lakes and parts of northern New York and northern Vermont.
The final week of summer in San Diego will start out a little hotter than average, then cool off a bit, says the National Weather Service. But high temperatures and gusty winds will raise the risk of wildfires Tuesday through Thursday in the region’s mountains and deserts. The fall equinox occurs at 6:54 p.m. on Saturday. But for reporting purposes, the weather service defines summer as June, July and August. This year, the mean temperature during that period was 73.6 degrees — making it the third hottest summer on record in San Diego.
