A short line of thunderstorms formed rapidly overnight, bringing isolated flash flooding.
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The episode as NWS VEF wrote it up.
A short line of thunderstorms formed rapidly overnight, bringing isolated flash flooding.
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 Nov 21, 3:55 AM MST, 58 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 255 AM PST Mon Nov 21 2016 .SYNOPSIS...A Pacific storm will move across the region through today and tonight, bringing locally breezy conditions and precipitation chances to much of the area. Dry conditions and near- average temperatures are expected Tuesday through the upcoming weekend. && .SHORT TERM...through Tuesday night. Widespread light precipitation pushing east through western San Bernardino and southern Inyo Counties this morning as an area of low pressure moves onshore over southern California. We are also starting to see increasing precipitation over far eastern Clark and Mohave Counties as the moist southerly flow ahead of the low is bringing increased lift to that area. The latest model runs have been consistent in showing that most of the precipitation moving through San Bernardino County will weaken and become more isolated as it reaches Clark and southern Nye Counties. In fact, we have started to see this in the latest radar images as the leading edge is becoming less organized. The models have been consistent in keeping the more widespread precipitation over Mohave County this morning. Still think that we will see some isolated to scattered rain showers across Clark and southern Nye Counties this morning, but it looks like precip totals will only amount to a few hundredths at best. Did go ahead and lower pops across those aforementioned area while raising pops a smidge over Mohave County. The models are also showing some decent instability over Mohave County this morning so have mention of thunder in the grids. Instability is much weaker this afternoon and it looks like the best chance to see thunderstorms will be before noon. Temperatures today will end up slightly below normal due to the increased cloud cover expected. Precipitation will spread east during the afternoon with mainly Lincoln and Mohave Counties seeing showers this afternoon. Drier conditions are expected to move in from the west as a drier flow moves into the area. Any remaining showers over the far eastern CWA is expected to end by midnight leaving dry conditions areawide. Weak high pressure will then over over the area Tuesday with light winds and mild temperatures. .LONG TERM...Wednesday through Sunday. Forecast difficulties brewing in the long term as the pattern becomes more progressive. There is model agreement that a storm system will pass through the Great Basin on Wednesday, with any precip chances confined to the Sierra and the northern fringes of our CWA. In its wake, strong north winds down the Colorado River look like a good bet on Thursday, and Wind Advisories may be needed as we get closer. By Friday, the next trough should be nearing the Pacific Northwest, with surface pressure gradients relaxing or even reversing, putting an end to the strong north winds. Thereafter, a series of shortwave troughs slams into the West Coast, and as often occurs with such a pattern, the models disagree on which wave(s) to amplify and to what degree. No confidence in reliably forecasting which shortwave trough will amplify several days out, so painted the long term with a very broad brush of gentle to breezy west to northwest winds, slight chances of precip over the southern Great Basin and high clouds over the Mojave Desert, with little change in temperatures. Presumably the picture will become clearer as we get closer in time. && .AVIATION...For McCarran...Isold to Sct showers will impact the terminal between 12z-18z with light rain showers and cigs potentially down to 5k feet at times. Any precipitation should exit the area by 18z with improving conditions. South to southwest winds 10-15 kts expected to develop after 16z and continue through much of the afternoon. Dry conditions and light winds expected by evening. For the rest of southern Nevada...northwest Arizona...and southeast California...Isolated to sct showers over much of the area today with the more widespread precipitation across Mohave County. Isold tstorms will also be possible over Mohave Co before 20z. Cigs down to 5k feet at times with some mountain obscurations possible. South to southwest winds 10-20 kts. Improving conditions by late this afternoon and evening. && Short Term/Aviation: Gorelow Long Term: Morgan For more forecast information...see us on our webpage: http://weather.gov/lasvegas or follow us on Facebook and Twitter
The Las Vegas radar (KESX), 77 km away, was scanning. The volume nearest the first event began at 11:52 UTC.
1 flash flood. Local standard time, as filed.
A swift water rescue occurred near the intersection of Egar Rd and Diabase Rd in Golden Valley.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2016Every state in 2016This day in weather historyWarnings in Arizona, November 2016
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: 662076.