This is a continuation of the July 17-21 Thunderstorms episode, which lasted ten days total.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS VEF wrote it up.
This is a continuation of the July 17-21 Thunderstorms episode, which lasted ten days total.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Las Vegas, NV wrote its last area forecast discussion before the first event at Jul 22, 9:40 AM PST, 3 hours 11 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 1040 AM PDT Thu Jul 22 2021 .SYNOPSIS...Moist and unstable air will continue over the region through the week as a typical summer monsoon set up persists. A disturbance moving in from Arizona may lead to more extensive thunderstorm development late this weekend and early next week. && .UPDATE...A Flash Flood Watch was issued for Clark, Lincoln and Mohave counties as it was becoming apparent that a weak disturbance rotating between the high over Arizona and a broad trough across northern California and northwest Nevada was acting as a trigger for convection this morning. Precipitable water values were 1.5-1.75" over southern Nevada and surroundinga areas with surface dewpoints in the 60s. These values are about as high we see during monsoon season. Isolated thunderstorms were already developing over eastern Lake Mead and the Sheep Range. Several high res models were showing storms expanding across Clark, Lincoln and northern Mohave counties early this afternoon. Updated PoP/Wx grids will be out shortly which. && .PREV DISCUSSION...140 AM PDT .SHORT TERM...Today through Friday night. Storms dissipated late last evening in our CWA, and as of 1 AM, only a few light showers were noted on area radars. Surface obs showed light winds, warm temperatures, and seasonably high dewpoints. Through Friday, thunderstorms remain the main concern. A consensus of high resolution models shows three areas of concern today: storms forming over the San Bernardino Mountains and moving north through Barstow, storms forming over the higher terrain of Lincoln and Clark counties and moving into the valleys (including Las Vegas), and storms forming over the higher terrain of Mohave county (including the Hualapai Mountains and the Flag Fire scar). As in previous days, the primary impacts will likely be flash flooding and/or debris flows resulting from heavy rain and damage to trees, power lines, etc resulting from high winds. A lack of forcing other than daytime heating and orographics should mean that storms weaken and dissipate shortly after sunset this evening. Expect a little less thunderstorm coverage on Friday, with the most favored areas being the mountains of Lincoln, Clark, and Mohave counties, with the Sierra crest also possibly getting in on the action. Fewer thunderstorms should allow temperatures to creep up a couple of degrees in most areas Friday. .LONG TERM...Saturday through Wednesday. [THIS WEEKEND] In several previous discussions, we have mentioned an easterly wave that is expected to move westward across the lower 48 and bring quite a bit of additional moisture and dynamics into the Desert Southwest this weekend. Uncertainty surrounding this wave revolves around both timing and location, which, in turn, provides quite a bit of uncertainty in the PoP forecast. Model consensus at this time is for the wave to drift slowly west across Arizona on Saturday, with the main effects for our area beginning late Sunday. That said, pop-up convection will continue each afternoon through the weekend, favoring Mohave County as well as the higher terrain of Lincoln and Clark counties. [MONDAY] As the easterly wave gets pulled around the monsoonal high into our area, the additional moisture and dynamics that it will bring will result in widespread showers and thunderstorms across the forecast area. Potential Flash Flood Watches will be coordinated this week with neighboring offices as our timing confidence increases over the next few days. The greatest chances for rain in most of the area should be on Monday, with highest chances over Mohave County and the higher elevations of southern Nevada. Primary concern will be flash flooding, though winds in excess of 50 mph are possible with associated outflow. One huge caveat which has caused headaches in the past: will Monday be so cloudy and showery areawide that temperatures stay down, thus preventing any instability from being realized, thus preventing heavy downpours? Or will there be breaks of sunshine, allowing solar heating, allowing instability, fueling heavy downpours? This detail is often best answered the day of an event, so stay tuned. [TUESDAY AND WEDNESDAY] The easterly wave will rotate north and then northeast around the monsoonal high, departing our area around Tuesday. This will cause precipitation chances for Tuesday and Wednesday to be focused on the higher terrain again. && .AVIATION...For McCarran...South winds will prevail overnight and early morning with speeds generally 6-9 kts. Look for thunderstorms to develop once again after 18z around the valley with some potential of seeing storms impacting the terminal between 21z-00z this afternoon. Gusty and erratic outflow winds will remain the biggest impact with these storms. CIGS could potentially drop to around 10k feet with any storm. Outside of thunderstorm influences, expect south winds 10-15 kts with FEW-SCT150-160. For the rest of southern Nevada, northwest Arizona and southeast California...Isolated thunderstorms expected again today, but mainly confined to Lincoln, Clark, Mohave, and San Bernardino counties. Storms will be capable of producing gusty outflow winds and heavy rain. Outside of thunderstorm influences, look for winds generally 10-15 kts or less with diurnal trends. FEW-SCT 140-160 with lower CIGS near storms. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && UPDATE...Adair SHORT TERM...Morgan LONG TERM...Varian/Morgan AVIATION...Gorelow For more forecast information...see us on our webpage: https://weather.gov/lasvegas or follow us on Facebook and Twitter
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
959 AM PDT THU JUL 22 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0500 PM TSTM WND DMG 5 E GOLDEN VALLEY 35.22N 114.14W
07/21/2021 MOHAVE AZ FIRE DEPT/RESCUE
TWO TRAVEL TRAILERS BLOWN OVER FROM
THUNDERSTORM WINDS IN GOLDEN VALLEY.
LOCATION ESTIMATED. TIME ESTIMATED FROM
RADAR.
0515 PM TSTM WND DMG 1 SW NEW KINGMAN-BUTLER 35.25N 114.03W
07/21/2021 MOHAVE AZ PUBLIC
RECEIVED PICTURES OF DAMAGED FENCES A
TRAMPOLINE ROOFS AN AWNING AND TREE DAMAGE
FROM NEIGHBORHOODS IN NORTHERN KINGMAN. LAT
AND LON ESTIMATED. TIME ESTIMATED BY RADAR
AND CONFIRMED BY PUBLIC.
&&
KILLIONThe Las Vegas radar (KESX), 38 km away, was scanning. The volume nearest the first event began at 20:55 UTC.
9 thunderstorm wind, 8 flash flood. Local standard time, as filed.
Damage occurred from south of Green Valley northward up Boulder Highway, and included numerous trees down, six to eight power poles down, major power lines down, and at least one parking awning damaged.
Warm Springs was closed between Arroyo Grande and Valle Verde, water covered the intersection of Sunset and Stephanie, and the onramp from Sunset onto Interstate 515 southbound was flooded a foot deep with two cars stalled.
Flooding left debris across Valley of Fire Highway.
Lawn furniture was destroyed, a security camera was damaged, a mesquite tree fell on a truck, and 14,000 customers lost power.
Lakeshore Road and Boulder Beach Frontage Road were covered with two feet of debris, including basketball sized rocks, due to flash flooding.
Roofs were blown off multiple structures, trees three to four feet in diameter were snapped, and car windows were broken.
Water, mud, boulders, and debris flowed over Calico Basin Road.
Several roads were closed due to flooding, and approximately 20 swift water rescues occurred.
The intersection of Blue Diamond Road and Rainbow Boulevard was closed due to flooding.
Echo Dam Road and Rose Valley Road were flooded.
Main Street in Pioche was flooded with water, rocks, and debris.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2021Every state in 2021This day in weather historyWarnings in Nevada, July 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 975442, 975443, 975444, 975445, 976193, 976194, 976195, 976197, 976198, 976200, 976199, 977107, 977096, 977098, 977100, 977105, 977106.