Severe Thunderstorm Warning 9, NWS Las Vegas, NV

758 
WWUS55 KVEF 210312
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
812 PM PDT Sat May 20 2023

CAC071-210320-
/O.EXP.KVEF.SV.W.0009.000000T0000Z-230521T0315Z/
San Bernardino CA-
812 PM PDT Sat May 20 2023

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL SAN BERNARDINO
COUNTY WILL EXPIRE AT 815 PM PDT...
                
The storm northwest of Barstow which prompted the warning has 
weakened below severe limits, and no longer poses an immediate 
threat to life or property. Therefore, the warning will be allowed 
to expire. Brief heavy rain will occur on sections of SR58 and US 
395 as the storm continues to weaken and slowly move to southwest 
until 9 pm.

LAT...LON 3482 11763 3508 11764 3535 11747 3507 11708
      3478 11710
TIME...MOT...LOC 0310Z 017DEG 15KT 3498 11740 

$$

Area Forecast Discussion
National Weather Service Las Vegas NV
146 PM PDT Sat May 20 2023

.SYNOPSIS...Expect another day of scattered afternoon and evening
showers and thunderstorms across much of the region on Sunday
before presistent troughing and dry southwesterly flow slowly
scours out the moisture and brings an end to shower chances by
Thursday. Above normal temperatures will continue until Wednesday
before more seasonal temperatures overspread the area heading into
the weekend.

&&

.DISCUSSION...A shortwave moving into the Pacific Northwest on
Sunday will act to nudge the persistent high pressure ridge east
of us over the Intermountain Range. Although this signals the
beginning a shifting weather pattern, highly anomalous moisture
and weak to moderate instability remains in place resulting in
another day of scattered afternoon and evening thunderstorms.
Storm coverage is expected to be rather widespread with at least a
slight chance in nearly every zone in our forecast area. Primary
concerns will again be gusty winds and dangerous lightning. Based
on the HREF, there should be plenty of sunshine to begin the day
with forecast high temperatures remaining several degrees above
normal.

To begin the work week, the moisture profile is shifting with our
southern areas seeing some drying in the mid-levels but still
above what would be considered normal. The 150-250% of normal
precipitable water values remain over our northern areas and these
areas will continue to be under the threat of afternoon/evening
thunderstorm activity. Some areas including the Western Mojave
Desert and Colorado River Valley are forecast to see afternoon
southerly breezes. By Tuesday, most areas will be dry and windy
but a chance of showers continue across our far northern Nevada
zones.

Temperatures on Monday and Tuesday are forecast to approach the
century mark in Las Vegas but the current probability of reaching
100 degrees at Harry Reid AP on either day is less than 10%.

Wednesday through Saturday...

A much quieter period is anticipated. There is a small but
lingering chance of showers over parts of southcentral Nevada on
Wednesday before dry conditions settle over our entire area
Thursday through Saturday. Troughing influences over the western
states will return temperatures to a more seasonal level late in
the week with afternoon breezes continuing.

&&

AVIATION...For Harry Reid...Very similar setup to yesterday. An
easterly wind less than 10 kts will be favored through much of the
afternoon with storms developing over the mountains north and west
of the valley. Best time for minor to moderate impacts at the
terminal from thunderstorms and resultant strong outflow gusts looks
fall between 00Z-03Z. Gusts up to 35kts could occur, potentially
warranting an AWW if so. Activity should dissipate around 03-04Z
leading to partly cloudy skies and winds less than 10 kts overnight
into Sunday morning. Another day of thunderstorm forecast over the
higher terrain tomorrow which could bring gusty outflow winds to the
valley once again in the late afternoon or early evening
hours.

For the rest of southern Nevada, northwest Arizona and southeast
California...Isolated to scattered TSRA expected across the region
this afternoon and evening, and again Sunday. All regional terminals
can expect at least VCTS after 21Z both days, with possible outflow
impacts as well, with gusts up to 30-35 kts, possibly 40+ kts not
out of the question, but probability for that is low at any
terminal. Coverage should wane significantly by the late evening,
but wind direction confidence is very low due to remnant outflows
expected to be prominent across the region.

&&

.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather or impacts according to standard operating
procedures.

&&

DISCUSSION...Salmen
AVIATION...Pierce

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
420 PM PDT SAT MAY 20 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0345 PM     TSTM WND GST     37 SW RACHEL            37.23N 116.16W
05/20/2023  M76 MPH          NYE                NV   MESONET

            AT 1545, ARL SORD STATION 38 RECORDED A
            THUNDERSTORM WIND GUST OF 76 MPH.

0232 PM     FLASH FLOOD      8 WSW MOUNTAIN PASS     35.44N 115.68W
05/20/2023                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            AT 1432 PDT, CALIFORNIA HIGHWAY PATROL
            REPORTED HEAVY RAINFALL WITH EROSION
            OCCURRING ON BOTH SIDES OF THE FREEWAY. CIMA
            ROAD WAS CLOSED DUE TO FLASH FLOODING. AT
            LEAST ONE VEHICLE WAS STUCK IN A WASH WITH
            WATER UP TO THE BOTTOM OF THE DOOR.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
445 PM PDT SAT MAY 20 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0415 PM     TSTM WND GST     8 SSE MERCURY           36.55N 115.95W
05/20/2023  M64 MPH          NYE                NV   MESONET

            AT 1615 PDT, THE ARL SORD SENSOR LOCATED AT
            AREA 5 NORTH RECORDED A THUNDERSTORM WIND
            GUST OF 64 MPH FROM THE NNW.

&&

MS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
451 PM PDT SAT MAY 20 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0415 PM     TSTM WND GST     13 N MERCURY            36.85N 115.95W
05/20/2023  M64 MPH          NYE                NV   MESONET

            AT 1615 PDT, THE ARL SORD SENSOR LOCATED AT
            AREA 5 NORTH RECORDED A THUNDERSTORM WIND
            GUST OF 64 MPH FROM THE NNW.

&&

MS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
529 PM PDT SAT MAY 20 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0500 PM     TSTM WND GST     10 NW MERCURY           36.77N 116.10W
05/20/2023  M93 MPH          NYE                NV   MESONET

            AT 1700 PDT, THE ARL SORD SENSOR LOCATED AT
            AREA 27 RECORDED A THUNDERSTORM WIND GUST OF
            93 MPH FROM THE ESE.

&&

MS