Red Flag Warning 13, NWS Las Vegas, NV

062 
WWUS85 KVEF 191141
RFWVEF

URGENT - FIRE WEATHER MESSAGE
National Weather Service Las Vegas NV
441 AM PDT Thu Sep 19 2019

CAZ226-191245-
/O.EXP.KVEF.FW.W.0012.000000T0000Z-190919T1200Z/
Owens Valley/Southern Inyo Forest-
441 AM PDT Thu Sep 19 2019

...RED FLAG WARNING WILL EXPIRE AT 5 AM PDT FOR THE OWENS VALLEY 
AND SOUTHERN INYO FOREST...

Winds and humidity are no longer meeting warning criteria and with
wind speeds forecast to trend downward this morning, the warning
will be allowed to expire at 5 am.

$$

AZZ102-192300-
/O.CON.KVEF.FW.W.0013.190919T1800Z-190920T0300Z/
Northwest Deserts/Northwest Plateau-
1141 AM GMT Thu Sep 19 2019

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
8 PM MST THIS EVENING FOR NORTHERN AND EASTERN MOHAVE COUNTY...

* AFFECTED AREA...In Arizona...Fire weather zone 102.

* TIMING...Late this morning through this evening.

* WIND...Sustained winds of 15 to 25 mph with gusts to 35 mph.

* HUMIDITY...Relative humidity decreasing to 10 to 15 percent 
  during the afternoon and evening.

* IMPACTS...any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$


weather.gov/lasvegas

556 
WWUS85 KVEF 192142
RFWVEF

URGENT - FIRE WEATHER MESSAGE
National Weather Service Las Vegas NV
242 PM PDT Thu Sep 19 2019


AZZ102-200300-
/O.CON.KVEF.FW.W.0013.000000T0000Z-190920T0300Z/
Northwest Deserts/Northwest Plateau-
942 PM GMT Thu Sep 19 2019

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING
FOR NORTHERN AND EASTERN MOHAVE COUNTY...

* AFFECTED AREA...In Arizona...Fire weather zone 102.

* TIMING...Through this evening.

* WIND...Sustained winds of 15 to 25 mph with gusts to 35 mph.

* HUMIDITY...Relative humidity decreasing to 10 to 15 percent
  continuing into this evening.

* IMPACTS...any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$


weather.gov/lasvegas

294 
WWUS85 KVEF 200256
RFWVEF

URGENT - FIRE WEATHER MESSAGE
National Weather Service Las Vegas NV
756 PM PDT Thu Sep 19 2019


AZZ102-200400-
/O.EXP.KVEF.FW.W.0013.000000T0000Z-190920T0300Z/
Northwest Deserts/Northwest Plateau-
256 AM GMT Fri Sep 20 2019

...RED FLAG WARNING WILL EXPIRE AT 8 PM MST THIS EVENING FOR
NORTHERN AND EASTERN MOHAVE COUNTY...

Relative humidities this evening have started to increase, with
many locations 15% to 25% by late evening. Relative humidities
overnight and Friday should continue to improve. Winds may
continue to gust 25 to 25 knots for the next few hours but also
should decrease by Friday. Critical fire conditions are not
anticipated over the weekend. 

$$


weather.gov/lasvegas

Area Forecast Discussion
National Weather Service Las Vegas NV
825 AM PDT Wed Sep 18 2019

.SYNOPSIS...Another system will bring breezy to locally windy
conditions and cooler temperatures to the region today and Thursday.
After a break this weekend with lighter winds and warmer
temperatures, another potent system will begin to bring unsettled
weather to the region next week.
&&

.UPDATE...Mostly clear skies dominate the region this morning but
tightening gradients in response to an incoming trough will result
in some gusty winds this afternoon.  The current forecast is in good
shape and no updates are needed.

&&

.DISCUSSION...through Tuesday.

Morning satellite imagery showing clouds associated with the next
trough moving into northern California and Nevada. This trough will
continue to dig south during the day and as it does it will bring
increasing surface pressure gradients to the area. Both pressure and
thermal gradients do not look too impressive across the region and
although we will see windy conditions over much of the area, winds
are expected to remain below advisory criteria. One concern will be
with the potential of seeing downslope winds over the eastern Sierra
late this afternoon and overnight. Models are indicating a good
cross barrier flow across the Sierra along with a fairly good stable
layer just above ridgetop. Do not think winds will be strong for
overall wind advisories, but will be more concerning for fire
weather. Winds could reach the 35-45 mph range this evening and
overnight and with the downslope component RH values should remain
rather poor for any overnight recoveries. Have elected to issue a
Red Flag Warning for the eastern Sierra slopes. Temperatures will
jump about 3-5 degrees over Tuesday as the dry southwest flow will
provide excellent mixing and will allow for the rise in temps.

By Thursday, the trough will dig even further south with a closed
low digging into northern Nevada. This will allow for a cold front
to sweep across the forecast area during the day with gusty
southwest winds ahead of the front and gusty northwest winds behind.
There isn't a significant amount of moisture associated with this
system, but there should be enough energy with the front to help
produce a few showers across the Sierra and portions of central
Nevada including Esmeralda, central Nye, and northern Lincoln
Counties. Temperatures will also drop a few degrees as cooler air
works into the area behind the front.

The forecast area will be under a cool dry northwest flow Friday
behind the trough that will be moving to the east. The region will
remain under a fairly active pattern into next week with the
potential of seeing a stronger system early next week that could be
some rain to parts of the forecast area. Models have been fairly
consistent in showing this and have gone ahead and increased pops a
bit for early next week. Along with the precipitation chances we
will also potentially see a fairly cool next week.
&&

.FIRE WEATHER...Increasing winds will be seen across the region
today ahead of a low pressure system which will move into the
region. Southwest winds 20-30 mph will be fairly common this
afternoon with some locations approaching 35 mph. At this time, it
looks marginal for any Red Flag conditions. However, there is better
potential of seeing moderate downslope winds late this afternoon and
overnight for the eastern Sierra slopes. Winds combined with poor
overnight RH recoveries should reach criteria and have gone ahead
and issued a Red Flag Warning for Fire Zone 226. Winds again will be
marginal for Red Flag conditions on Thursday as a cold front moves
through central Nevada. There could also be a few showers impacting
the far northern zones on Thursday, but wetting rains are not
expected.
&&

.AVIATION...For McCarran...Southerly winds will increase this
afternoon and persist through Thursday, with gusts of 20 to 30 knots
common, before decreasing Thursday night. No operationally
significant clouds are expected through the period.

For the rest of southern Nevada, northwest Arizona and southeast
California...Southerly winds will increase this afternoon, with
gusts of 20 to 30 knots over much of the region. A cold front will
pass through the southern Great Basin this evening, with north to
northwest winds gusting 20 to 30 knots behind it through Thursday,
while south to southwest winds gusting 20 to 30 knots persist over
the Mojave Desert. No operationally significant clouds are expected
through the period.
&&

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

DISCUSSION...Gorelow
AVIATION.....Morgan

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