Alert archive / Nevada / Flash Flood Watches in 2018

Flash Flood Watch 6, NWS Elko, NV

July 11, 2018Nye County, White Pine County, Nevada

NWS Elko, NV issued this flash flood watch at Jul 11, 2018, 1:40 PM PDT for Nye County, White Pine County, Nevada. It took effect at Jul 12, 2018, 11:00 AM PDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued
Jul 11, 2018, 1:40 PM PDT (20:40 UTC)
In effect from
Jul 12, 2018, 11:00 AM PDT
Expired
Jul 12, 2018, 9:34 PM PDT
In force
11 hr
Issued by
NWS Elko, NV
Flood severity
None

Counties Nye County, NV, White Pine County, NV

The radar

The Elko radar (KLRX), 242 km from the middle of the area, began a volume at 20:40 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 12:00Z, 8.7 hours before the alert went out and 263 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 12:00Z on 2018-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 380 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 12:00Z on 2018-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 square meters per square second.1939Sfc1 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
380 J/kg
Mixed-layer CIN
-142 J/kg
Mixed-layer LCL
1940 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
60 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 flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Elko, NV wrote its last area forecast discussion before this flash flood watch went out at Jul 11, 2:55 AM PDT, 10 hours 45 minutes earlier.

Area forecast discussion, Jul 11, 2:55 AM PDT, 10 hours 45 minutes before
Area Forecast Discussion
National Weather Service Elko NV
255 AM PDT Wed Jul 11 2018

.SYNOPSIS...Dry with above normal temperatures across northern
Nevada today and Thursday, with near normal temperatures and
thunderstorm activity across central NV.

&&

.SHORT TERM...Today through Thursday. Weak trough energy moving
through the Pacific NW today will push dry and stable air down
into northern NV. As such, the northerly expansion of
thunderstorms up from central NV will be delayed. Temperatures
across northern NV will remain nearly 10 degrees above normal the
next couple days. As for central NV, thunderstorm activity will
redevelop today across most of northern Nye and White Pine
Counties, where temperatures will be near normal.

.LONG TERM...Thursday night through next Tuesday.

Subtropical ridge over the Great Basin will be the prevailing
large scale pattern with subtle day to day changes. The best
diurnal convection will be a daily occurrence over the central
Nevada terrain, but convective threat diminishes farther north.

The highest probability for afternoon storms appears to be
Friday afternoon, as southeast flow keeps the monsoonal moisture
feed into Nevada. Convective potential may expand as far north as
the northern NV border. This moisture tap weakens as a trough
moves across the Pacific Northwest, shifting mid level flow
shifts to westerly by Saturday. Moisture continues to circulate
around the high core, but precipitable water values will be lower
with drier air along the northern border.

With respect to temperatures, above normal temps continues each
day, including the morning hours. Could be quite hot by next
Tuesday if the subtropical high becomes centered over Nevada.

&&

.AVIATION...Thunderstorms are expected in the vicinity of KELY and
KTPH this afternoon. Strong wind gusts to 40 kts may occur from
nearby storms, with brief moderate to heavy rain if a storms moves
directly over the airport site.

KWMC, KBAM and KEKO will be in a drier and stable regime for the
next 24 hours, where no storms are expected.

&&

.FIRE WEATHER...Little to no northerly expansion of thunderstorm
activity today, with most storms centered over zones 455 and 457
where moderate to heavy rainfall is possible. For zones 467 468
and 469 along with northern 470, dry conditions continue, with
temperatures remaining around 10 degrees above normal.

&&

.LKN WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch from 11 AM PDT this morning through this
evening for Northeastern Nye County-Northwestern Nye County-Ruby
Mountains/East Humboldt Range-South Central Elko County-
Southeastern Elko County-White Pine County.

&&

96

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 10, 6:04 PM PDTSpecial Weather StatementLKN26 min
Jul 10, 6:40 PM PDTSpecial Weather StatementLKN50 min
Jul 10, 7:59 PM PDTFlash Flood WarningLKNNye3 hr
Jul 10, 8:45 PM PDTFlash Flood WatchLKNElko, Nye, White Pine26 hr
Jul 11, 1:10 PM PDTFlash Flood WarningLKNWhite Pine3 hr
Jul 11, 1:44 PM PDTFlash Flood WarningLKNWhite Pine3 hr
Jul 11, 1:55 PM PDTAreal Flood AdvisoryLKNEureka, Lander, Nye, White Pine3 hr
Jul 11, 1:58 PM PDTSpecial Weather StatementLKN47 min
Jul 11, 2:30 PM PDTSpecial Weather StatementLKN45 min
Jul 11, 2:40 PM PDTSpecial Weather StatementLKN50 min
Jul 11, 2:48 PM PDTSpecial Weather StatementLKN42 min
Jul 11, 2:52 PM PDTFlash Flood WarningLKNWhite Pine3 hr
Jul 11, 3:40 PM PDTAreal Flood AdvisoryLKNWhite Pine3 hr
Jul 11, 3:49 PM PDTAreal Flood AdvisoryLKNNye, White Pine3 hr

Nearby

Flash Flood Watches in Nevada, 2018Every flash flood watch 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.