MONSOON FIRST ALERT: Increase in shower, storm activity over southern Nevada

UPDATE 3:32 P.M. A Severe Thunderstorm Warning has been issued for parts of Lake Mead until 4 p.m.

🚨Severe Thunderstorm Warning🚨 has been issued for a portion of Lake Mead until 4:00 PM. This includes Boulder Beach, Callville Bay, Hoover Dam, and Las Vegas Bay. Gusts of 40 to 50 mph will be possible. Take shelter if you are in this area now. @lakemeadnps #nvwx #lakemead pic.twitter.com/JplcEkJVSY

— NWS Las Vegas (@NWSVegas) July 26, 2019

UPDATE 2:28 P.M. The National Weather Service reports an increase in shower and storm activity over southern Nevada and northwest Arizona.

UPDATE JULY 26 12 A.M. 13 Action News Meteorologist Dani Beckstrom has a look at the Futurecast from Thursday night through the weekend. Watch the forecast below.

UPDATE 3 P.M. Officials warn that weather conditions could create gusts and waves at parts of Lake Mead.

UPDATE 2 P.M. There is a Flash Flood Warning in effect for southern Clark County. Meteorologist Dani Beckstrom has the latest information.

UPDATE 12:15 P.M. A big storm is approaching the southwest area of the valley.

UPDATE 12:15 P.M. Storms have been spotted in the mountains south of the Las Vegas valley.

UPDATE 8:40 A.M. Couple of heavier downpours are being reported in the Red Rock Canyon National Recreation Area. Rain also send in the northern part of the valley.

UPDATE 6:07 A.M. JULY 25: Humid air and clouds remain in place this morning, but we don't expect anything worse than a sprinkle.

Storms will pop back up late this morning over the mountains, and then drift slowly to the north. That means the chance of passing downpours returns to Las Vegas today, primarily after lunchtime.
Localized heavy rain could lead to isolated flash flooding. Lightning will also be a concern, along with the chance of 40 mph outflow gusts from any nearby storms.

UPDATE 7:03 P.M. Boulder City is under a Severe Thunderstorm Warning until 7:45 p.m. A thunderstorm in the area produced a radar indicated wind gust of 50 mph near Boulder Beach. Wind gusts up to 60 mph are possible with this thunderstorm cell, which could produce tree or roof damage. Dangerous winds capable of capsizing vessels are also possible for the Lake Mead Recreation Area. This thunderstorm is also producing heavy rain and frequent lightning, so anyone in the area should head in doors immediately.

Watch 13 Action News Meteorologist Dani Beckstrom share an update below.

UPDATE 12:24 P.M. The National Weather Service in Las Vegas has issued a flash flood watch for portions of northwest Arizona, southeast California, and southern Nevada, including the following areas, in southern Nevada, Lake Mead National Recreation Area, Las Vegas valley, northeast Clark County, Sheep Range, southern Clark County, Spring Mountains/Red Rock Canyon, and western Clark and southern NYE County until 11 p.m.

RELATED: Latest weather alerts

UPDATE 11 A.M. A Flash Flood Warning has been issued by National Weather Service Las Vegas for the area near Interstate 15 and California-Nevada state line.

A Flash Flood Warning has been issued by @NWSVegas for the area near the 15 near the California-Nevada line. Not an impact to Las Vegas proper. pic.twitter.com/pW1LqCU2J8

— Justin Bruce (@just1nbruce) July 24, 2019

UPDATE 8:30 A.M. Rain has been reported in several areas of the valley. A radar check at 8:34 a.m. shows rain along the 215 beltway in Henderson.

JULY 24: Monsoon moisture will again deliver the threat of scattered storms on Wednesday. Some downpours are possible this morning and the chance continues into the afternoon. There should be more rain than yesterday, however, we are not expecting a total washout.

High temps will reach 103 degrees this afternoon with a mostly cloudy sky.

UPDATE 11:30 P.M.: 13 Action News Meteorologist Dani Beckstrom has alook at the forecast for Tuesday night and the rest of the week.

TUESDAY NIGHT FORECAST:

LOOKING AHEAD AT THE WEEK:

UPDATE 4:28 P.M.: McCarran International Airport says there may be some delays due to weather this evening. To check departure times click here.

UPDATE 4:28 P.M.: 13 Action News Meteorologist Dani Beckstrom has a look at the latest radar and what to expect heading into the middle of the week.

ORIGINAL STORY
The summer monsoon pattern controls the forecast around Las Vegas and Southern Nevada this week, delivering the chance for downpours through Thursday.

Despite a few sprinkles this Tuesday morning, Las Vegas has managed to stay mostly dry through the early afternoon. We run the risk of an isolated storm in the valley this afternoon, as well as a cluster of stronger storms from Arizona trying to move our way late this afternoon (after 5:00 p.m.) through the early evening. The threat of storms appears highest across the eastern part of Clark County, including LakeMead and Mesquite.

INTERACTIVE RADAR

Any thunderstorms that develop this week could deliver damaging wind gusts, dangerous lightning, small hail, and the threat of localized downpours that could create possible flash flooding.

Affordable items that help protect your home from monsoon

You'll feel the humidity the most on Tuesday, Wednesday, and Thursday, and it's not a coincidence that those are the days when storms are most likely. The influx of moisture will cause increased clouds and high temperatures will remain below average for late July (average is 105° this time of summer).

When flash flooding hits, do you know how to escape a sinking vehicle?

By Friday and the upcoming weekend, a ridge of high pressure will drift closer to Southern Nevada, effectively shutting down the monsoon moisture and bringing an end to our pop-up storm chances. Unfortunately, this set-up allows big heat to return to Las Vegas this weekend. The current forecast calls for 110 degrees on Saturday and 111degrees on Sunday, which would tie for our hottest temperature so far this year.