Alert archive / Nevada / Excessive Heat Warnings in 2018

Excessive Heat Warning 9, NWS Las Vegas, NV

July 20, 2018Clark County, Nye County, Nevada; Inyo County, San Bernardino County, California; Mohave County, Arizona

NWS Las Vegas, NV issued this excessive heat warning at Jul 20, 2018, 3:05 AM PDT for Clark County, Nye County, Nevada; Inyo County, San Bernardino County, California; Mohave County, Arizona. It took effect at Jul 24, 2018, 10:00 AM PDT. It was in force for 4 days. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 20, 2018, 3:05 AM PDT (10:05 UTC)
In effect from: Jul 24, 2018, 10:00 AM PDT
Expired: Jul 28, 2018, 8:00 PM PDT
In force: 4 days
Issued by: NWS Las Vegas, NV

Counties Mohave County, AZ, Inyo County, CA, San Bernardino County, CA, Clark County, NV, Nye County, NV

The radar

The Las Vegas radar (KESX), 100 km from the middle of the area, began a volume at 10:08 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 00:00Z, 10.1 hours before the alert went out and 24 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1033 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 3228 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 61 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this excessive heat warning went out, 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 this excessive heat warning went out at Jul 20, 2:53 AM PDT, 12 minutes earlier.

Area forecast discussion, Jul 20, 2:53 AM PDT, 12 minutes before

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In the hours before

Local storm report, Jul 19, 11:44 PM PDT, 3 hours 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1144 PM PDT THU JUL 19 2018

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

1045 PM     TSTM WND DMG     1 SW SAM BOYD STADIUM   36.08N 115.03W
07/19/2018                   CLARK              NV   PUBLIC

            TWITTER POST REPORTED DOWNED POWER LINES ON
            BOULDER HWY BETWEEN E RUSSELL RD AND SUNSET
            RD.

1034 PM     FLASH FLOOD      3 NE LAS VEGAS BAY      36.15N 114.83W
07/19/2018                   CLARK              NV   PARK/FOREST SRVC

            LAKE MEAD NPS REPORTED THAT NORTHSHORE ROAD
            WAS CLOSED DUE TO FLOODING.

1024 PM     TSTM WND DMG     3 S NORTH LAS VEGAS AIR 36.17N 115.21W
07/19/2018                   CLARK              NV   PUBLIC

            POST ON TWITTER SHOWS A LARGE DEAD TREE
            UPROOTED IN A NEIGHBORHOOD NEAR ALTA DRIVE
            AND SOUTH DECATUR BLVD.

0927 PM     TSTM WND GST     3 SE THE STRIP          36.08N 115.14W
07/19/2018  M58 MPH          CLARK              NV   ASOS

            MCCARRAN ASOS RECORDED 58 MPH WIND GUSTS.

0913 PM     TSTM WND GST     7 SSE EAGLE VALLEY RESE 37.92N 114.17W
07/19/2018  M72 MPH          LINCOLN            NV   MESONET

            IMMIGRATION WASH RAWS REPORTED WIND GUSTS OF
            72MPH. TIME ESTIMATED FROM RADAR.

0904 PM     TSTM WND DMG     4 NNE NELLIS AFB        36.28N 115.01W
07/19/2018                   CLARK              NV   TRAINED SPOTTER

            TRAINED SPOTTER REPORTED 2 TENTED TRACTOR
            TRAILERS PUSHED ACROSS THE PARKING LOT.
            DEBRIS AND TRASH CANS WERE TOSSED FROM THE
            WIND.

0858 PM     TSTM WND GST     2 ENE NELLIS AFB        36.25N 115.00W
07/19/2018  E53 MPH          CLARK              NV   ASOS

            NELLIS AIRFORCE BASE ASOS RECORDED A WIND
            GUST OF 53 MPH.

0858 PM     TSTM WND GST     1 N NELLIS AFB          36.25N 115.03W
07/19/2018  M63 MPH          CLARK              NV   MESONET

            CCRFCD NLNN2 NELLIS AFB NORTH RECORDED 41MPH
            SUSTAINED WINDS AND 63MPH GUSTS.

0848 PM     HIGH SUST WINDS  1 NE APEX               36.34N 114.92W
07/19/2018  M51 MPH          CLARK              NV   MESONET

            CCRFCD APXN2 APEX AT I15 RECORDED 51 MPH
            SUSTAINED WINDS.

0746 PM     FLASH FLOOD      2 NNW PANACA            37.82N 114.41W
07/19/2018                   LINCOLN            NV   EMERGENCY MNGR

            LINCOLN COUNTY DISPATCH REPORTED SIGNIFICANT
            FLOODING AT CATHEDRAL GORGE STATE PARK.
            GUARDRAIL WAS TAKEN OUT BY FLOOD WATER.
            CAMPGROUND IS COMPLETELY INUNDATED WITH
            WATER.

0725 PM     TSTM WND GST     27 SSE LITTLEFIELD      36.51N 113.82W
07/19/2018  M62 MPH          MOHAVE             AZ   MESONET

            OLAF KNOLLS RAWS RECORDED 62MPH WIND GUSTS.
            TIME ESTIMATED FROM RADAR.

0722 PM     DUST STORM       DOLAN SPRINGS           35.59N 114.27W
07/19/2018                   MOHAVE             AZ   EMERGENCY MNGR

            MOHAVE COUNTY DISPATCH REPORTED A DUST STORM
            IN DOLAN SPRINGS.

0722 PM     DUST STORM       7 ENE DOLAN SPRINGS     35.64N 114.17W
07/19/2018                   MOHAVE             AZ   TRAINED SPOTTER

            DUST STORM SEEN BY A TRAINED SPOTTER AT HOME
            WITH VISIBILITY UNDER AN EIGHTH OF A MILE.

0716 PM     TSTM WND GST     12 SW ELGIN             37.25N 114.71W
07/19/2018  M67 MPH          LINCOLN            NV   MESONET

            KANE SPRINGS RAWS RECORDED A WIND GUST OF 67
            MPH. TIME IS ESTIMATED BY RADAR.

0636 PM     FLASH FLOOD      5 NNW PANACA            37.86N 114.42W
07/19/2018                   LINCOLN            NV   EMERGENCY MNGR

            LINCOLN COUNTY EMERGENCY MANAGER REPORTED
            FLASH FLOODING IN THE PIOCHE AND PANACA
            AREAS. US93 WAS BEGINNING TO WASH OUT NEAR
            MILE MARKER 113.

0630 PM     DUST STORM       18 NW VALENTINE         35.56N 113.91W
07/19/2018                   MOHAVE             AZ   PUBLIC

            DUST STORM SEEN ON HUALAPAI VALLEY
            OBSERVATORY WEBCAMS BEGINNING AT 630PM AND
            LASTING UNTIL AROUND 800PM.

0530 PM     FLASH FLOOD      5 NNW PANACA            37.86N 114.42W
07/19/2018                   LINCOLN            NV   EMERGENCY MNGR

            LINCOLN COUNTY DISPATCH REPORTED A ROAD
            CLOSURE ON SR320 AT MILE MAKER 1 DUE TO
            FLOODING. TIME ESTIMATED FROM RADAR.

&&

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 19, 5:15 PM PDT	Areal Flood Advisory	VEF	Lincoln	3 hr
Jul 19, 5:22 PM PDT	Severe Thunderstorm Warning	VEF	Lincoln	53 min
Jul 19, 5:58 PM PDT	Flash Flood Warning	VEF	Lincoln	3 hr
Jul 19, 6:56 PM PDT	Areal Flood Advisory	VEF	Clark, Lincoln, Nye	3 hr
Jul 19, 7:47 PM PDT	Areal Flood Advisory	VEF	Clark, Lincoln	3 hr
Jul 19, 7:55 PM PDT	Severe Thunderstorm Warning	VEF	Clark, Lincoln	80 min
Jul 19, 8:47 PM PDT	Severe Thunderstorm Warning	VEF	Clark	58 min
Jul 19, 9:16 PM PDT	Areal Flood Advisory	VEF	Clark	3 hr
Jul 19, 10:12 PM PDT	Flash Flood Warning	VEF	Clark	3 hr
Jul 19, 10:39 PM PDT	Flash Flood Warning	VEF	Clark	3 hr
Jul 19, 11:26 PM PDT	Areal Flood Advisory	VEF	Nye	3 hr
Jul 20, 3:05 AM PDT	Heat Advisory	VEF	Clark, Esmeralda, Lincoln, Nye	9 days
Jul 19, 6:39 PM PDT	Flash Flood Warning	VEF	Inyo	3 hr
Jul 19, 8:45 PM PDT	Areal Flood Advisory	VEF	Inyo	3 hr
Jul 20, 2:04 PM PDT	Areal Flood Advisory	VEF	Inyo	3 hr
Jul 20, 3:35 PM PDT	Flash Flood Warning	VEF	Inyo	3 hr
Jul 20, 4:38 PM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
Jul 19, 5:21 PM PDT	Areal Flood Advisory	VEF	Mohave	3 hr
Jul 19, 5:42 PM PDT	Flash Flood Warning	VEF	Mohave	3 hr
Jul 19, 6:39 PM PDT	Dust Storm Warning	VEF	Mohave	66 min
Jul 20, 1:42 PM PDT	Areal Flood Advisory	VEF	Mohave	3 hr
Jul 20, 3:00 PM PDT	Flash Flood Warning	VEF	Mohave	3 hr
Jul 20, 4:45 PM PDT	Areal Flood Advisory	VEF	Mohave	3 hr

Nearby

Excessive Heat Warnings in Nevada, 2018 Excessive Heat Warnings in California, 2018 Excessive Heat Warnings in Arizona, 2018 Every excessive heat warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.