Hillary in California update: Landing in Mexico

California, USA – Tropical Storm Hillary continues to dump record rains on Southern California.

Accumulating rain caused flash floods and small slides on hillsides on some roads. Hillary is moving north-northwest at 28 mph. The latest warning from the National Hurricane Center has winds of 45 mph meaning it still maintains tropical storm status.

Credit: KXTV

Hillary will continue to bring life-threatening flooding as well as the potential for small mudslides and debris flows through early Monday. Localized flooding is possible across the Intermountain West as Hillary moves north through Monday.

The storm will steadily lose strength overnight as it moves over land, but still brings a chance for localized flooding across the Intermountain West.

The threat of thunderstorms and heavy rain ends over southern California on Monday, expanding northward and eastward along the storm’s path.

Gusty winds are expected early Monday over Northern California with periods of rain and a slight chance of isolated thunderstorms.

Credit: KXTV

Credit: KXTV

Updated at 6:00 p.m

Hillary has officially crossed the border into California as a tropical storm.

Heavy rains will continue to increase flood risk across much of Southern California. Flood, high wind and tropical storm warnings are in place across the region and the impacts brought by Hillary will continue into the overnight hours.

Surface winds now show the center of circulation over the San Diego area as heavy rains and gusty winds continue. Hillary peaked as a Category 4 hurricane with a central pressure of 939 millibars and maximum sustained winds of 145 mph, but quickly weakened as it encountered cold ocean waters. It is moving north at 23 mph with a central pressure of 997 millibars and maximum sustained winds of 50 mph.

Credit: NOAA

Hillary has officially crossed the border and is now over the San Diego area as indicated by biting surface winds

Rainfall is expected to peak between now and 9 p.m., according to NWS Los Angeles, but chances remain until Monday afternoon.

The forecast remains on track for Northern California, although rain chances are down slightly in the Valley and Sacramento area.

Credit: KXTV

Rainfall amounts decreased slightly ahead of Hillary’s arrival in Northern California on Monday, but isolated thunderstorms could push rainfall totals higher

Updated at 1:30 p.m

Hillary continues her journey across the Baja Peninsula and is on track to center itself over Southern California in the next few hours.

Maximum sustained winds are 60 mph and Hillary is expected to maintain tropical storm status once she crosses the border into California. Wind gusts of 70 mph have already been recorded along the high elevations of Southern California and strong winds will continue as Hillary approaches.

Rain totals are beginning to increase in Southern California. Some of the heaviest rain will occur until 2 p.m. along Interstate 10, when several flash flood and severe thunderstorm warnings are in effect. Regardless, heavy rain is falling across much of Southern California and will continue throughout the day Sunday.

In Northern California, major impacts associated with Hillary remain on track to bring light rain chances to the Valley, heavy rain to the Sierra, widespread cloud cover, and tropical humidity on Monday.

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Updated at 11am

As of an 11:00 a.m. update from the National Hurricane Center, Hillary is a tropical storm with sustained winds of 65 mph. This weakness was expected, however There are no changes in impacts expected across Southern California.

Tropical Storm Hillary is headed straight for Southern California. The storm will bring heavy rain, strong winds and potential flooding to a wide area of ​​Southern California.

What’s new about this storm is that it will consolidate as a tropical storm when it impacts Southern California. This prompted the issuance of California’s first-ever tropical storm warning, which remains in effect in Southern California. But as much as this is a wind event, it is a bigger rain event.

Five inches or more of rain is possible on the eastern side of the peninsula’s mountain range and in the deserts of Southern California. In some places, this is more than double the average rainfall for an entire year. A flood watch has been launched throughout Southern California, western Arizona, southern Nevada and even parts of Utah, Oregon and Idaho. Although it is important to prepare for the effects of wind, it is especially important to prepare for the effects of rain and flooding.

Credit: KXTV

The highest level of flash flood risk exists in the deserts of Southern California today.

It’s already starting to rain in Southern California. The storm extended as it died down, with the bulk of the rain falling on the north side of the eye. There is a mix of light to moderate rain this morning, but heavy rain will occur this afternoon. This will lead to the possibility of “catastrophic flooding,” in the words of the National Hurricane Center, especially in deserts. Level 4/4 There is a high risk of flash floods in deserts.

But the threat of floods is not limited to deserts. Urban flooding also poses a real threat. Much like a weather storm, Hillary will bring large amounts of rain that will fall very quickly. Mudslides and debris flows are also possible, especially near burn scars.

Credit: KXTV

There is a 5% chance of a tornado hitting the deserts of Southern California this afternoon, Sunday, August 20.

In addition to threatening winds and flooding, storm surges may also produce tornadoes, especially east of the peninsula’s mountain range. Hurricanes are large, spinning storms. Since there is a significant amount of rotation associated with hurricanes by default, it would not take much for hurricanes to rotate in the rainbands they pass through.

This is a multi-faceted event, so be weather aware!

In Northern California, some will start to notice some changes today as well.

Clouds are already moving overhead, an indication of tropical moisture flowing through California. Most of Northern California will be under cloudy to overcast skies today, but rain will stay away until late this evening.

Credit: KXTV

Wind gusts expected on Sunday afternoon, August 20, 2023.

Another sign that something is changing are the northerly winds that will develop this afternoon. These northerly winds will dry out the area and provide a short window of elevated fire danger, but the overall risk is lower due to the shorter duration and the increased moisture that comes immediately afterward.

Overnight from Sunday into Monday, winds shift to the south as Hillary’s remnants move toward northern California. The southern winds are very humid, accompanied by rain showers. Widespread rain is expected across the valley during Monday morning’s drive, continuing until about the lunch hour. In the afternoon, the chances of rain decrease, but scattered showers and thunderstorms are possible in the valleys and highlands of the country.

Credit: KXTV

Future broadcast shows showers across the valley during a drive on the morning of Monday, August 21, 2023.

Regarding precipitation in Northern California, it is important to note that exact precipitation totals still depend heavily on the exact track of the storm. However, there is a good consensus in the data that the center of the remnant will pass through western Nevada, on the eastern side of the Sierra. This means rain chances in the Central Valley are better east of I-5 and in the foothills. Rain is almost guaranteed throughout the Sierra.

Total precipitation will generally be lower the closer you get to the Pacific Coast. West of Interstate 5, rainfall totals are expected to reach less than a tenth of an inch. Along and east of I-5, rainfall totals will likely range between a tenth of an inch and a half of an inch, with higher amounts in the foothills. Across the high country, up to an inch and a half of rain is likely, as increased humidity and terrain effects will help the rain continue.

Credit: KXTV

Map showing total rainfall expected across Northern California through Tuesday, August 22, 2023.

What happened on August 19 with Hurricane Hillary

Hurricane Hillary began to weaken from Category 4 status as the storm moved to significantly cooler ocean temperatures.

  • The first tropical moisture plumes rushed into southern California
  • Rainfall increased in Southern California as the night hours approached

See more:

Live Radar: Track Hillary’s path and tropical storm warning for Southern California

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