This is the third and final entry documenting the long-duration excessive heat episode which began on August 30th. The first two entries covered August 30-31 and September 1-4.
Every event with a place to put it; 6 filed by county or forecast zone are drawn at its center, in a lighter ring. 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 the third and final entry documenting the long-duration excessive heat episode which began on August 30th. The first two entries covered August 30-31 and September 1-4. There were 11 heat-related deaths in Las Vegas during the episode; one is documented in the August 30-31 entry, eight are documented in the September 1-4 entry, and two are documented in this entry.
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 Sep 4, 8:43 PM PST, 3 hours 17 minutes earlier.
Area Forecast Discussion
National Weather Service Las Vegas NV
943 PM PDT Sun Sep 4 2022
.SYNOPSIS...Very hot conditions will continue through the middle
of next week before temperatures moderate and moisture increases
next weekend. In the meantime, a few isolated storms are possible
today mainly in northwest Arizona, with drier conditions to follow
for most of next week.
&&
.UPDATE...Clusters of thunderstorms blasted across the
southern half of Mohave County and the Colorado River Valley from
Laughlin-Bullhead City to Lake Havasu earlier this afternoon and
evening as advertised. Gusts of 60-75 mph were measured across these
areas and extensive power outages were reported.
Isolated storms were persisting into western San Bernardino County
as of 930 pm, but were weakening. The latest HRRR and HREF continue
to support the idea that the air mass will dry out and stabilize
over our region on Labor Day as the high overhead expands southward.
The main weather concern now continues to be the dangerous heat and
record-breaking temperatures persisting through at least Wednesday.
No changes needed to the going forecast. -Adair
&&
.PREV DISCUSSION...
1241 PM PDT Sun Sep 4 2022
.SHORT TERM...Tonight through Thursday.
Any thunderstorms and outflow winds that develop this afternoon will
end after sunset, with quiet but mild weather expected overnight.
Tonight and Monday the main area of high pressure shifts east and
and starts to build back over the region, which will scour out any
moisture and thus end afternoon thunderstorm chances. PWATs decrease
through Monday and CAPE Monday afternoon is progged to be much lower
across the region than it is has been these past couple of
afternoons. A few hi-res models try to develop something in the
higher terrain of the southern Great Basin as well as southwest
Utah, but these storms will struggle given the upper level
increasing heights.
Continued dry conditions should persist through Thursday. With
decreasing moisture comes increasing temperatures. The area of high
pressure is expected to sit firmly in place over eastern Nevada and
southern Utah as it strengthens through much of the week. On Tuesday
and Wednesday, expecting upper level heights 2 to 3 standard
deviations above normal with a nearly 600dm high shown on models.
The excessive heat warning continues as there is high confidence for
well above normal temperatures through Wednesday. With very warm
overnight lows and how long this extreme heat will be in place,
extreme heat risk and dangerous conditions are likely. The excessive
heat warning may need to be extended into Thursday, but will hold
off for now as it is uncertain how incoming systems will interact
with the area of high pressure and when they will knock back the
ridge. Given the strength of this high and past experience- strong
high pressure tends to win out and hold on longer than long range
models tend to show (which we have been seeing as models keep
trending longer with this heatwave).
.LONG TERM...Thursday through the Weekend.
Friday into next weekend is looking promising for a tropical system
developing along the coast of Mexico to be drawn up near northern
Baja and southern California along the southwest periphery of the
high pressure which will be nudged near the Four Corners Region.
This would bring the potential for considerable tropical moisture
spreading into our region and this is reflected in the latest
ensemble-based NBM. The gridded temperature forecast pulls highs
down 10-15 degrees Friday and Saturday while chances for
precipitation increase to 20-40 percent Saturday and Sunday. While
this scenario is far from certain, the latest ECMWF and GEFS
ensemble means are in quite good agreement with the high moving to
the east and the tropical circulation near northern Baja which would
open the door for the influx of moisture. We will continue to watch
for this possibility while we wait for the heat to break.
&&
MAX HIGH SUNDAY, SEP 4 MONDAY, SEP 5 TUESDAY, SEP 6
Record(Yr)/Fcst Record(Yr)/Fcst Record(Yr)/Fcst
Las Vegas 111(1947)/107 112(2020)/108 114(2020)/110
Bishop 107(2020)/103 105(2020)/105 104(2020)/106
Needles 117(2020)/109 119(2020)/110 120(2020)/112
Barstow-Daggett 113(2020)/106 114(2020)/110 116(2020)/111
Kingman 107(2020)/99 109(2020)/101 110(2020)/103
Desert Rock 109(2020)/103 107(2020)/105 109(2020)/108
Death Valley 122(2020)/119 125(2020)/122 123(2020)/124
The table below shows the record warm low temperature, the year the
record was last set, and the forecast temperature for all of our
climate sites.
WARM LOW SUNDAY, SEP 4 MONDAY, SEP 5 TUESDAY, SEP 6
Record(Yr)/Fcst Record(Yr)/Fcst Record(Yr)/Fcst
Las Vegas 84(2007)/85 86(2019)/86 84(2020)/86
Bishop 64(2014)/63 61(1984)/61 61(1950)/62
Needles 89(2007)/83 91(2001)/84 99(2019)/85
Barstow-Daggett 80(2017)/82 82(1984)/83 82(2016)/83
Kingman 76(1982)/72 75(2007)/74 77(1917)/75
Desert Rock 79(1996)/79 78(2002)/78 78(1989)/79
Death Valley 100(2007)/96 95(2013)/95 96(2013)/95
&&
&&
.AVIATION...For Harry Reid...Isolated thunderstorms later this
afternoon and evening will be located in far southern Clark, Mohave
and eastern San Bernardino Counties. Winds in the valley will favor
an easterly direction during max heating. Still some uncertainty in
the forecast this evening. There is some agreement in models showing
an outflow boundary reaching the valley around 03Z this evening.
Quite a bit more uncertainty in the magnitude of the wind though.
For now, forecast does call for a shift to the southeast with speeds
up to 12 kts. Of course, will have a better handle on the situation
once storms develop. Wind regime into Labor Day favors the typical
downvalley direction late tonight becoming light and variable
tomorrow morning. As temperatures warm Labor Day an easterly
direction will develop up to 9 kts. Isold shower/thunderstorm
possible west and north of Las Vegas Labor Day. FEW-SCT clouds
around 12-15 kft during the period.
For the rest of southern Nevada, northwest Arizona and southeast
California...Convective allowing models show isolated
showers/thunderstorms favoring the higher terrain of northwest
Arizona this afternoon. Storms move into the lower Colorado River
Valley and eastern San Bernardino County between 00Z and 04Z this
evening. KIFP and KEED most at risk of seeing impacts from gusty
outflow winds. Anticipate last of the thunderstorms to dissipate
over San Bernardino County by 06Z. Winds overnight will favor
typical downslope directions with speeds becoming upvalley Labor Day
with speeds generally less than 10 kts. The exception will be in the
Owens Valley around KBIH where south wind gusts up to 20 kts
possible. Isold showers/thunderstorms possible west and north of Las
Vegas Labor Day. FEW-SCT clouds around 12-15 kft during the period.
&&
.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather or impacts according to standard operating
procedures.
&&
SHORT TERM...Nickerson
LONG TERM...Outler
AVIATION...Pierce
For more forecast information...see us on our webpage:
https://weather.gov/lasvegas or follow us on Facebook and TwitterPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
705 PM PDT SUN SEP 4 2022
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0830 PM FLASH FLOOD 5 SW KINGMAN 35.14N 114.11W
09/02/2022 MOHAVE AZ COUNTY OFFICIAL
OATMAN HIGHWAY CLOSED FROM MILE MARKER 40 TO
EAST SILVER CREEK ROAD DUE TO FLASH FLOODING.
&&
VARIANPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
727 PM PDT SUN SEP 4 2022
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0645 PM TSTM WND GST 3 NNW MOHAVE VALLEY 34.97N 114.61W
09/04/2022 M59 MPH MOHAVE AZ MESONET
ARIZONA MET SITE RECORDED A 59 MPH WIND GUST
BETWEEN 1800 AND 1900. EXACT TIME ESTIMATED
BY NEARBY DAMAGE REPORTS.
0705 PM FLASH FLOOD GOLDEN VALLEY 35.23N 114.23W
09/04/2022 MOHAVE AZ COUNTY OFFICIAL
WEST CHINO DRIVE CLOSED FROM NORTH SANTA
CRUZ ROAD TO NORTH SANTA MARIA ROAD DUE TO
FLASH FLOODING.
0705 PM FLASH FLOOD 1 WNW GOLDEN VALLEY 35.23N 114.24W
09/04/2022 MOHAVE AZ COUNTY OFFICIAL
WEST CHINO DRIVE CLOSED FROM NORTH COLORADO
ROAD TO NORTH TEDDY ROOSEVELT DUE TO FLASH
FLOODING.
0710 PM FLASH FLOOD 5 SSW GOLDEN VALLEY 35.16N 114.24W
09/04/2022 MOHAVE AZ COUNTY OFFICIAL
WEST SHINARUMP DRIVE CLOSED FROM SOUTH
COLORADO ROAD TO SOUTH ESTRELLA ROAD DUE TO
FLASH FLOODING.
0715 PM FLASH FLOOD 6 N GOLDEN VALLEY 35.30N 114.21W
09/04/2022 MOHAVE AZ COUNTY OFFICIAL
NORTH LEGEND RANCH ROAD CLOSED FROM WEST
BURRO DRIVE TO HIGHWAY 93 DUE TO FLASH
FLOODING.
&&
VARIANPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
732 PM PDT SUN SEP 4 2022
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0725 PM FLASH FLOOD 5 WNW GOLDEN VALLEY 35.25N 114.31W
09/04/2022 MOHAVE AZ COUNTY OFFICIAL
SOUTH EGAR ROAD CLOSED FROM HIGHWAY 68 TO
WEST SHINARUMP DRIVE DUE TO FLASH FLOODING.
&&
VARIANPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
858 PM PDT SUN SEP 4 2022
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0540 PM TSTM WND DMG 3 WSW LAKE HAVASU CITY 34.47N 114.37W
09/04/2022 MOHAVE AZ EMERGENCY MNGR
CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3
WSW LAKE HAVASU CITY. TWO OVERTURNED BOATS
ON LAKE HAVASU AS A RESULT OF THUNDERSTORM
RELATED WIND GUSTS. INJURIES UNKNOWN AT THIS
TIME. EXACT LOCATION ESTIMATED.
0650 PM TSTM WND DMG 2 SSE LAKE HAVASU CITY 34.46N 114.31W
09/04/2022 MOHAVE AZ EMERGENCY MNGR
POWER OUTAGE IN SOUTH LAKE HAVASU CITY DUE
TO THUNDERSTORM RELATED WIND DAMAGE TO POWER
LINES.
0650 PM TSTM WND DMG YUCCA 34.87N 114.15W
09/04/2022 MOHAVE AZ EMERGENCY MNGR
POWER OUTAGE IN YUCCA DUE TO THUNDERSTORM
RELATED WIND DAMAGE TO POWER LINES.
&&
VARIANThe national radar mosaic for the moment the first event began.
7 excessive heat. Local standard time, as filed.
This event began in August and continued through early September.
This event began in August and continued through early September.
This event began in August and continued through early September.
This event began in August and continued through early September.
This event began in August and continued through early September.
This event began in August and continued through early September.
This event began in August and continued through early September.
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
| Event | Date | Age | Sex | Where | Kind |
|---|---|---|---|---|---|
| Excessive Heat, Las Vegas Valley | 2022-09-06 | 48 | Male | Outside/Open Areas | Direct |
| Excessive Heat, Las Vegas Valley | 2022-09-08 | 67 | Female | Permanent Home | Indirect |
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2022Every state in 2022This day in weather historyWarnings in Nevada, September 2022
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: 1058457, 1058458, 1058459, 1058460, 1058461, 1058462, 1058463.