Heavy rain

All posts tagged Heavy rain

By Brett Rathbun – AccuWeather

Heavy rain will soak portions of Washington and British Columbia through Friday, leading to flash flooding before spreading inland through the weekend.

“A fire hose of moisture extending from the western Pacific Ocean to western North America will focus over British Columbia to Washington state through Saturday,” AccuWeather Senior Meteorologist Brett Anderson.

The heaviest rain will fall across the Olympic and Cascade mountains of Washington as well as Vancouver Island and the Coastal Mountains of British Columbia. Total rainfall could exceed 10 inches (250 mm) in some locations through this weekend.

Continue reading at AccuWeather: Pacific Fire Hose to Aid Drought Across Western US Into Early Next Week

RELATED:
Northwest Regional Radar
Current US Watches and Warnings
British Columbia Weather Center

Advertisements

By –  AccuWeather

Heavy rain, thunderstorms and the risk of flash flooding will expand from northwestern Mexico through the southwestern United States into Wednesday.

A surge of tropical moisture associated with Tropical Depression Sixteen-E will unleash an expanding area of torrential downpours and locally gusty thunderstorms. The downpours could be more widespread and heavier than the typical storms.

While the atmospheric event will bring beneficial rain to some drought-stricken areas and greatly aid firefighting efforts, the same system will threaten lives and property.

Continue reading at AccuWeather: Rain Poised to Wallop Southwest US, Raise Flooding Risk Into Wednesday

RELATED:
Weekly Wrap-Up: Wildfires, Flooding Rain Wreak Havoc in Western US
Senior Meteorologist Ken Clark’s Western Weather Blog
PHOTOS: California’s Valley Fire Becomes Fourth Most Destructive Wildfire in California History

By Brett Rathbun – AccuWeather

A storm system will move across the central Plains into the Great Lakes through Friday and will bring a round of heavy rain and severe thunderstorms.

This storm system will also bring a soaking rain to parts of the Dakotas and Nebraska through Friday afternoon.

According to AccuWeather Meteorologist Josh Searles, “Thunderstorms will bring localized flash flooding and damaging wind gusts from central Illinois to northeast Oklahoma.”

Continue reading at AccuWeather: Storms to Roll Through Kansas City, Chicago Through Friday

RELATED:
AccuWeather Severe Weather Center
North-Central Interactive Radar
Fall Foliage Forecast: Warm Air May Hinder Emergence of Bright Colors in East

By  – AccuWeather

The strongest storm so far this season and in the last four to 10 years for California continues to deliver drenching rain to hard-hit drought areas, along with the risk of damaging winds, flooding and mudslides.

Rainfall from this single storm could approach the average rainfall for the entire month of December in some areas. In some cases, this has the potential to be biggest single rain-producer about 10 years.

The most potent storm in the train will deliver millions of gallons of water per square mile on much of California through Friday.

“There is plenty of moisture for this storm to tap,” said AccuWeather.com Western Weather Expert Ken Clark. “And this is why it will be such a soaking rain.”

Travel Disruptions and Risks to Property Owners

In addition to the positive impact the storm will bring, it will also cause adverse conditions.

Disruptions to travel and outdoor activities will persist through Friday, impacting millions. The storm will cause more flooding in poor-drainage areas and will result in poor visibility for drivers along Interstate-5 and other major routes.

RELATED:
REPORTS: Follow Along With the Impacts of the California Storm
California Interactive Weather Radar
Will the Barrage of Storms End California’s Drought?

The heavy rain will be of concern for some motorists and property owners. Additional mudslides and rock slides are likely in Southern California through Friday. The risk of mudslides will be greatest in recent burn areas.

A major mud and debris flow occurred early Friday morning in Camarillo Springs, in the Springs burn area. The debris flow affected several homes on San Como Lane, according to the Los Angeles NWS Office.

Enough rain can fall to lead to stream flooding and high water on some of the rivers. Normally dry washes over the deserts could be subject to flash flooding.

Snow levels will drop below Donner Pass at 7,200 feet on I-80 in the Sierra Nevada.

According to Clark, “A foot of snow could fall at an elevation around 6,000 feet with 2 feet of snow or more possible above 7,000 feet.”

Snow falling at the rate of several inches per hour can lead to whiteout conditions.

Snow levels will not dip down to Tejon and Cajon passes, but fog and heavy rain will be a problem.

Low cloud ceilings and gusty winds may cause flight delays.

The gusts can make travel dangerous for high profile vehicles on the bridges and could lead to lengthy flight delays at area airports.

Biggest Storm in Years for California

Multiple big storms have hit California in the past decade. In some locations, the storm this week will bring the most rain from a single system in about 10 years.

For northern areas the storm this week will rival that of the past four to 10 years. Some storms of note in the north occurred in February 2009, October 2009 and a day or two either side of the start of the new year in January 2006. In Southern California, the recent benchmark is most likely during December 2010.

For Sacramento, California, this storm has the potential to bring a total of between 3 and 6 inches of rain. During December 2005 to the first couple of days of January 2006, 10.52 inches of rain fell with 4.57 inches of rain falling from Dec. 30, 2005, to Jan. 2, 2006.

At San Francisco, 9.34 inches of rain fell during December 2005, compared to an average of 4.03 inches for the month. As of Dec. 12, 2014, over 7 inches of rain fell this month, half of which fell during this event.

Rainfall from this storm will be heavy in parts of southern California, but it will be unlikely to exceed that of the storms during December 2010. During December 2010, 8.83 inches of rain fell at Los Angeles, which was more than four times that of average for the month. As of the December 12, Los Angeles had received 2.14 inches of rain.

More at AccuWeather: Biggest Storm in Years for California Unleashes Flooding Rain, Mudslides

By  – AccuWeather

As the train of storms from the Pacific continues, a dose of heavy rain will greatly assist in California and regional drought relief during the second half of this week.

While the storm will bring major problems, including flooding, mudslides and damaging winds, it will bring much needed rain to the region.

From 1-3 inches of rain will fall on coastal Southern California with an average of 3-6 inches of rain forecast over central and northern parts of the state. This translates to between 17 and 100 million gallons per square mile from this storm alone.

Locally higher amounts of rain, up to a foot, are possible on some of the west- and southwest-facing slopes of the coastal ranges, Sierra Nevada and southern Cascades.

While more rain than what this storm will deliver will be needed to end the drought completely, this will be a major step in the right direction. The ground will be thoroughly soaked.

Significant rainfall will spread southward and inland, reaching into the heavy agricultural areas of the Sacramento and San Joaquin valleys.

Runoff from the storm will cause water levels to surge rapidly in streams and will eventually begin to empty into lakes and reservoirs. The storm from early in the month sent water flowing through Yosemite Falls.

RELATED:
Biggest Storm in Nearly 10 Years for Northern California to Cause Flooding, Mudslides
Western Weather Expert Blog by Ken Clark
Interactive California Radar

A couple of additional soaking storms are possible during next week, before the pattern shifts later in the month.

Much of California and portions of neighboring states have been in the throes of extreme to exceptional drought from this summer into this fall. The drought has its roots to a couple of years ago, when storm systems with rain and mountain snow became scarce.

During the last part of November 2014, storms with soaking rain began to return to the region.

From Dec. 1, 2012, to Nov. 29, 2014, San Francisco racked up a deficit of 20.9 inches, which was about 50 percent of its normal average rainfall. Since Nov. 29, the city has received nearly 5 inches of rain, which is more than four times that of average. This has reduced the approximate two-year deficit by about 20 percent.

Los Angeles incurred a rainfall deficit of 14.9 inches, which was about 44 percent of its normal average rainfall. Since the end of November, the city has received about 1.5 inches of rain, which is nearly three times that of average. The recent rainfall has reduced the deficit for the same period by nearly 10 percent.

A further reduction in the rainfall deficit will occur this week and next week.

According to Western Weather Expert Ken Clark, “This will be the second storm in a week with more rain in a week than most places had for the entire winter year.”

Up to several feet of snow has fallen prior to this week’s storms in the high country of the northern Sierra Nevada and southern Cascades. Yards of snow will fall over the higher terrain of these mountain ranges, which will be water in the bank for this coming spring and summer as it melts and flows into area streams and viaducts.

More at AccuWeather: Storm to Attack California Drought This Week

By

Storms are lining up over the northern Pacific, en route to the northwestern United States and British Columbia. One of the storms next week will be associated with Ana.

The first substantial train of storms of the winter season is on track to impact the Northwest this week into next week.

The storms will bring rounds of drenching rain, gusty wind and powerful waves to coastal areas from northern California to Oregon, Washington and British Columbia.

One substantial storm will affect the area into Thursday. This storm has already produced wind gusts to 66 mph along the Oregon coast.

Another storm this weekend could produce even stronger wind gusts along the coast. Winds can be powerful enough to down tree limbs or loosely-rooted trees. Any time trees limbs come down there is the potential for sporadic power outages and blocked roads.

According to AccuWeather Senior Meteorologist Bernie Rayno, “Each of the storms will bring heavy rain to coastal areas, which can be enough to cause flash flooding and mudslides.”

A general 3 to 6 inches (75 to 150 millimeters) of rain can fall along the immediate coast, but locally higher amounts are possible in the eastern slopes of the coastal ranges, including the Olympic Mountains in northwestern Washington state.

While the rain will be less intense to the lee of the coastal ranges, enough can fall to slow travel at times along the Interstate-5 corridor from Redding, California, to Portland, Oregon, and Seattle. Rain will soak Victoria and Vancouver, British Columbia.

Some rain may even reach far enough south to affect the World Series games in San Francisco.

RELATED:
Ana Impacts Hawaii Despite Avoiding a Direct Hit
AccuWeather.com Forecast Maps
Stories From the Peaks: Hikers, Ice Climbers Survive Volatile Mountain Weather

Some of the rain will reach and may benefit hard-hit drought areas of northern California and southern Oregon.

More sporadic and less intense rainfall will push farther south in California, but not to the extent to have significant impact on the long-term exceptional drought just yet.

Ana Impact

Meanwhile, Ana continues to track over the central Pacific Ocean, west of Hawaii.

As this system curves around over colder waters farther north later this week into the weekend, it will lose its tropical characteristics and may be absorbed by another storm. However, it will not completely fade away.

According to AccuWeather Senior Meteorologist Henry Margusity, “Some of the heavy rain and strong winds from Ana may survive right to the coast of the Northwest.”

“That system may then plow onshore during early next week,” he said.

The center of Ana could hit anywhere from the northern coast of British Columbia to western Washington or northwestern Oregon, but the impact from heavy rain and gusty winds may far-reaching and significant. This especially true after some areas are hit with 10 inches of rain (250 millimeters) prior to Ana’s arrival.

As a result the risk of flash flooding, mudslides and downed trees will continue well into next week.

Large swells will be carried along by Ana and will crash along the coast next week.

More at AccuWeather: Ana to Join Train of Drenching Storms in Northwest

By Brian LadaAccuWeather

Moisture from Tropical Rainstorm Simon will fuel heavy rain and thunderstorms over the Southwest through Wednesday before shifting over the Plains.

Rain and storms will expand across Arizona throughout the day on Wednesday before reaching into western New Mexico on Wednesday night.

The heaviest rain is expected to focus on the southern half of Arizona with several inches of rain possible through Wednesday night.

Some of the cities in Arizona that are encompassed in this zone include Phoenix, Tucson, Flagstaff and Safford.

“Normally dry washes and arroyos may turn into raging waterways, while mudslides could occur over the higher terrain,” said AccuWeather.com Senior Meteorologist Kristina Pydynowski.

Roads may become impassable for a time during or immediately following the heavy rain, bringing traffic to a standstill.

For some, this may be reminiscent of when Odile delivered flooding rain across the interior Southwest.

Know when the rain will begin by using AccuWeather.com MinuteCast™. It has the minute-by-minute forecast for your exact location. Type your city name, select MinuteCast™, and input your street address. On mobile devices, you can also use your GPS location.

Despite the dangers that Simon brings, the rain will be beneficial to help ease the ongoing drought conditions.

Much of Arizona and New Mexico have been classified as being in at least a moderate drought by the U.S. Drought Monitor, although some of the ground in these states has seen improvement over the past several weeks from rounds of tropical rains.

Unfortunately, the rain from Simon will miss California, the state feeling the most extreme impacts from the ongoing drought.

RELATED:
Interactive Radar
Current Watches and Warnings
Simon’s Moisture to Increase Flooding Risk in Central US

The moisture left over from Simon is expected to shift into the Plains through the second half of the week, enhancing rainfall from Oklahoma to Kentucky.

This could result in localized flooding and keep temperatures well below normal across the region on Thursday and Friday.

More at AccuWeather: Simon to Spark Flooding in Southwest US