Alert archive / Nevada / Flash Flood Watches in 2021

Flash Flood Watch 3, NWS Las Vegas, NV

July 19, 2021Inyo County, California; Mohave County, Arizona; Esmeralda County, Nye County, Nevada

NWS Las Vegas, NV issued this flash flood watch at Jul 19, 2021, 2:37 AM PDT for Inyo County, California; Mohave County, Arizona; Esmeralda County, Nye County, Nevada. It took effect at Jul 19, 2021, 12:00 PM PDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Jul 19, 2021, 2:37 AM PDT (09:37 UTC)
In effect from
Jul 19, 2021, 12:00 PM PDT
Expired
Jul 19, 2021, 8:00 PM PDT
In force
8 hr
Issued by
NWS Las Vegas, NV
Flood severity
None

Counties Mohave County, AZ, Inyo County, CA, Esmeralda County, NV, Nye County, NV

The radar

The Las Vegas radar (KESX), 194 km from the middle of the area, began a volume at 09:40 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, 9.6 hours before the alert went out and 99 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-pSkew-T log-p diagram, Las Vegas, NV at 00:00Z on 2021-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 470 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 00:00Z on 2021-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -43 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
470 J/kg
Mixed-layer CIN
-221 J/kg
Mixed-layer LCL
2357 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-43 m²/s²
0-3 km storm-relative helicity
-38 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

108 
WGUS65 KVEF 190937
FFAVEF

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Las Vegas NV
237 AM PDT Mon Jul 19 2021

.Anomalously high moisture values are in place across the southern 
Great Basin and Mojave Desert. Thunderstorms that develop have the 
potential of producing heavy rain.

AZZ001-003-191930-
/O.NEW.KVEF.FF.A.0003.210719T1900Z-210720T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Northwest Plateau-Northwest Deserts-
Including the cities of Western Grand Canyon, Pipe Spring National 
Monument, Tuweep, Golden Valley, Mt Trumbull, Colorado City, 
Valentine, Yucca, Kingman, Wikieup, and Dolan Springs
237 AM MST Mon Jul 19 2021

...FLASH FLOOD WATCH IN EFFECT FROM NOON MST TODAY THROUGH THIS 
EVENING...

The National Weather Service in Las Vegas has issued a

* Flash Flood Watch for a portion of northwest Arizona, including 
  the following areas, Northwest Deserts and Northwest Plateau.

* From Noon MST today through this evening.

* The potential for heavy rainfall and flash flooding exists this 
  afternoon and evening over Mohave County as thunderstorms develop 
  over the higher terrain then drift into the lower valleys. 
  Rainfall rates of 1 to 1.5 inches an hour are possible.

* In addition to flash flooding of washes and roadways in the watch 
  area, debris flows will be possible near the Flag Fire burn area 
  including the community of Pine Lake and Hualapai Mountain Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move away from recently burned areas. Life-threatening flooding of 
creeks, roads and normally dry washes is likely. The heavy rain will 
likely trigger rockslides, mudslides, and debris flows in steep 
terrain, especially in and around the Flag burn area.

&&

$$

CAZ519-521-NVZ014-191930-
/O.NEW.KVEF.FF.A.0003.210719T1900Z-210720T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Eastern Sierra Slopes-White Mountains of Inyo County-Esmeralda and
Central Nye County-
Including the cities of Silver Peak, Westgard Pass, Bristlecone 
Pine, Goldfield, Aspendell, Whitney Portal, Dyer, and Beatty
237 AM PDT Mon Jul 19 2021

...FLASH FLOOD WATCH IN EFFECT FROM NOON PDT TODAY THROUGH THIS 
EVENING...

The National Weather Service in Las Vegas has issued a

* Flash Flood Watch for portions of southeast California and south 
  central Nevada, including the following areas, in southeast 
  California, Eastern Sierra Slopes and White Mountains of Inyo 
  County. In south central Nevada, Esmeralda and Central Nye County.

* From Noon PDT today through this evening.

* The potential for heavy rainfall and flash flooding exists this 
  afternoon and evening over the eastern Sierra Slopes, White 
  Mountains and Esmeralda County as thunderstorms develop over the 
  higher terrain. Rainfall rates of up to 1 inch an hour are 
  possible.

* A Flash Flood Watch means that conditions may become favorable for 
  flooding of creeks and stream in and around recent burn areas. In 
  steep terrain, the rainfall could trigger rockfalls and deposit 
  debris on roadways. Be prepared to take immediate action should 
  rainfall trigger flash flooding.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.



&&

$$

BKP
2 follow-up statements
129 
WGUS65 KVEF 191902
FFAVEF

Flood Watch
National Weather Service Las Vegas NV
1202 PM PDT Mon Jul 19 2021

.Anomalously high moisture values are in place across the southern 
Great Basin and Mojave Desert. Thunderstorms that develop have the 
potential of producing heavy rain.

AZZ001-003-200300-
/O.CON.KVEF.FF.A.0003.000000T0000Z-210720T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Northwest Plateau-Northwest Deserts-
Including the cities of Western Grand Canyon, Pipe Spring National 
Monument, Tuweep, Golden Valley, Mt Trumbull, Colorado City, 
Valentine, Yucca, Kingman, Wikieup, and Dolan Springs
1202 PM MST Mon Jul 19 2021

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING...

The Flash Flood Watch continues for

* A portion of northwest Arizona, including the following areas, 
  Northwest Deserts and Northwest Plateau.

* Until 8 PM MST this evening.

* The potential for heavy rainfall and flash flooding exists this 
  afternoon and evening over Mohave County as thunderstorms develop 
  over the higher terrain then drift into the lower valleys. 
  Rainfall rates of 1 to 1.5 inches an hour are possible.

* In addition to flash flooding of washes and roadways in the watch 
  area, debris flows will be possible near the Flag Fire burn area 
  including the community of Pine Lake and Hualapai Mountain Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move away from recently burned areas. Life-threatening flooding of 
creeks, roads and normally dry washes is likely. The heavy rain will 
likely trigger rockslides, mudslides, and debris flows in steep 
terrain, especially in and around the Flag burn area.

&&

$$

CAZ519-521-NVZ014-200300-
/O.CON.KVEF.FF.A.0003.000000T0000Z-210720T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Eastern Sierra Slopes-White Mountains of Inyo County-Esmeralda and
Central Nye County-
Including the cities of Silver Peak, Westgard Pass, Bristlecone 
Pine, Goldfield, Aspendell, Whitney Portal, Dyer, and Beatty
1202 PM PDT Mon Jul 19 2021

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 8 PM PDT THIS EVENING...

The Flash Flood Watch continues for

* Portions of southeast California and south central Nevada, 
  including the following areas, in southeast California, Eastern 
  Sierra Slopes and White Mountains of Inyo County. In south central 
  Nevada, Esmeralda and Central Nye County.

* Until 8 PM PDT this evening.

* The potential for heavy rainfall and flash flooding exists this 
  afternoon and evening over the eastern Sierra Slopes, White 
  Mountains and Esmeralda County as thunderstorms develop over the 
  higher terrain. Rainfall rates of up to 1 inch an hour are 
  possible.

* A Flash Flood Watch means that conditions may become favorable for 
  flooding of creeks and stream in and around recent burn areas. In 
  steep terrain, the rainfall could trigger rockfalls and deposit 
  debris on roadways. Be prepared to take immediate action should 
  rainfall trigger flash flooding.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.



&&

$$

JA
008 
WGUS65 KVEF 200300
FFAVEF

Flood Watch
National Weather Service Las Vegas NV
800 PM PDT Mon Jul 19 2021

AZZ001-003-CAZ519-521-NVZ014-200400-
/O.EXP.KVEF.FF.A.0003.000000T0000Z-210720T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Northwest Plateau-Northwest Deserts-Eastern Sierra Slopes-White
Mountains of Inyo County-Esmeralda and Central Nye County-
Including the cities of Western Grand Canyon, Pipe Spring National 
Monument, Tuweep, Golden Valley, Mt Trumbull, Colorado City, 
Westgard Pass, Bristlecone Pine, Valentine, Aspendell, Whitney 
Portal, Goldfield, Dyer, Yucca, Beatty, Kingman, Wikieup, Silver 
Peak, and Dolan Springs
800 PM MST Mon Jul 19 2021 /800 PM PDT Mon Jul 19 2021/

...FLASH FLOOD WATCH WILL EXPIRE AT 8 PM MST/8 PM PDT/ THIS 
EVENING...

The Flash Flood Watch for portions of northwest Arizona, southeast 
California and south central Nevada, including the following areas, 
in northwest Arizona, Northwest Deserts and Northwest Plateau. In 
southeast California, Eastern Sierra Slopes and White Mountains of 
Inyo County. In south central Nevada, Esmeralda and Central Nye 
County will expire at 8 PM MST/8 PM PDT/ this evening.

The Flash Flood Watch is cancelled. Widespread flash flooding is no 
longer expected to pose a threat however, isolated storms could lead 
to localized flooding. Please continue to heed remaining road 
closures.

$$

JS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 5:35 PM PDTFlash Flood Warning Considerable damage threatVEFSan Bernardino3 hr
Jul 18, 6:24 PM PDTAreal Flood AdvisoryVEFSan Bernardino47 min
Jul 18, 7:10 PM PDTFlash Flood Warning Considerable damage threatVEFSan Bernardino3 hr
Jul 19, 2:42 PM PDTFlash Flood Warning Considerable damage threatVEFInyo3 hr
Jul 18, 5:20 PM PDTSevere Thunderstorm WarningVEFMohave40 min
Jul 18, 5:40 PM PDTFlash Flood Warning Considerable damage threatVEFMohave3 hr
Jul 18, 6:20 PM PDTFlash Flood Warning Considerable damage threatVEFMohave6 hr
Jul 19, 2:31 PM PDTFlash Flood Warning Considerable damage threatVEFMohave3 hr
Jul 19, 3:31 PM PDTFlash Flood Warning Considerable damage threatVEFMohave3 hr

Nearby

Flash Flood Watches in Nevada, 2021Flash Flood Watches in California, 2021Flash Flood Watches in Arizona, 2021Every flash flood watch in 2021

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.