NWS El Paso, TX wrote its last area forecast discussion before the first event at Feb 2, 2:39 PM MST, 21 minutes earlier.
Area forecast discussion, Feb 2, 2:39 PM MST, 21 minutes before
Area Forecast Discussion
National Weather Service El Paso TX/Santa Teresa NM
239 PM MST Wed Feb 2 2022
.SYNOPSIS...
Winter weather is expected this evening and overnight with the
passage of a strong backdoor cold front. Temperatures will drop
well below seasonal averages behind this system. We will have
snow showers across the area. Heavy snow is likely over the
Sacramento Mountains and portions of Hudspeth county this evening.
Light to moderate snow showers are likely across the lowlands
along and east of the Rio Grande Valley. Areas west of the Rio
Grande have a chance for light snow showers. Very cold
temperatures are expected to continue this weekend. Although
conditions will be mostly dry.
&&
29
.DISCUSSION...
.SHORT TERM...Tonight through Thursday...
Current satellite imagery shows a potent vort max moving through
Phoenix right now (~20Z). This is the energy that will eventually
combine with the cold air (currently knocking at the doorstep)
tonight and produce rains changing to snows.
A few showers are developing around the area this afternoon thanks
to the lift/divergence aloft due to the southwest flow, approaching
vort max, and left exit region of a 500 mb jet streak. Vort
advection will increase through the overnight hours, as the cold
front to the east surges west thanks to the decoupling of the
atmosphere and lightening of westerly flow. This front will provide
plenty of frontogenetic lift, especially across the Sacs.
Additionally, the dendritic growth zone will be plenty saturated
with lift. All of these features, coupled with the approaching vort
aloft, will result in heavy snow across this region, with light to
moderate snows from the Rio Grande Valley and on eastward. However,
the timing of the cold air is still key. There are indications in
the observations/mesoanalysis data, in addition to our own local
conceptual model/model biases, that this cold air will arrive a
little faster than previously thought. Some of the shorter range
data is hinting at this possibility. For one, the colder air to our
north and east is a little colder than some models suggest. And, as
is typical for shallow cold air masses (see just about a year ago on
Vtines day) they typically move faster than what models indicate,
and during the overnight hours. Looks as though the cold air will
approach El Paso between 06 and 09Z, which is a few hours quicker
generally. Nevertheless, we're still expecting around 1 to 3 inches
across the Rio Grande Valley, a little more in the Tularosa Basin (2
to 4" based on GEFS plumes and a few of the short range guidance), 3
to 5" in Hudspeth county and 6 to 12" across the Sacs. But a little
more can be expected if the colder air is a few hrs faster. The one
additional caveat in the forecast, especially for the Sacs, is the
potential for very high snow to liquid ratios, with temperatures in
the teens and 20s, at least, with heavy snowfall. That would turn
0.8" of QPF into the 12" range easily, and potentially more if
closer to 1" of QPF falls. Right now, staying put with winter
weather advisories for the Rio Grande and Tularosa Basin, and
warnings for east of there, with dangerous driving conditions due
to the low visibility and slick roadways.
By the predawn hours, snow will be continuing, but the trough axis
(and hence lift) along with most of the moisture will be quickly
exiting. So by the mid morning to midday hours, just a few snow
showers will linger through the afternoon. Still, the morning
commute will be slicey and dicey to say the least with the potential
for icy roads (any rain prior to the cold air will freeze) and
snowy, slippery conditions. Very cold temperatures are expected on
Thursday, with low 30s and 20s most of the day, with light to mildly
breezy winds making it feel much colder, especially early Thursday.
Wind chill values will be below zero across area mtns and the single
digits to low teens in the lowlands at times.
&&
35
.LONG TERM...Friday Night through Tuesday Night...
Snow showers will be mostly done by Friday evening. The HREF
members keep a slight chance over the Gila region and the
Sacramento Mountains as we may still have some lingering snow showers
overnight. However, snow accumulations should be under an inch as
the upper trough leaves the area. Anyways, we are going to remain
in a northerly flow at the surface and aloft, so very cold air
will continue to advect to the south. Thus, morning low
temperatures on Friday will be very cold for February, around 10
to 25 degrees below normal. Wind chills will be in the lower teens
and single digits, especially in the far eastern portions of the
CWA. There is a possibility for a wind chill advisory on Thursday
night through Friday morning for portions of Hudspeth County and
the Otero Mesa. Temperatures on Friday afternoon will continue to
be cold, but the latest GEFS plumes and MOS guidance is
indicating temps above freezing for a few hours. However, it will
be very hard to reach 40F in the lowlands, except for areas west
of the Continental Divide including western Grant and Hidalgo
Counties. Afternoon highs will be 20 to 30 degrees below normal.
The mountains remain below freezing through Saturday afternoon.
By Saturday, the upper trough will be east of our region, but we
remain under a northerly flow. Thus, temperatures will warm up
slightly, but will remain well below normal. Morning lows will be
in the teens areawide. At least, wind chills will be slightly
warmer in the upper single digits and teens. The 850 mb temps
with the GFS and the ECMWF indicate above freezing temperatures
by the afternoon hours around 3-5 C. Thus, Saturday high's will
be in the 40s for the lowlands.
Another backdoor cold front and upper trough aloft arrives on
Sunday. But not as potent as the previous one. This system is
mostly dry, so we may only have a few snow showers over area
mountains due to orographic enhancement. Regardless, snow amounts
will be very light, if any on Sunday evening and night in the Gila
region and the Sacs. Once this upper system leaves the area, weak
ridging aloft will take place. This will lead to a slow warm up
trend for the Borderland, but we will remain with temperatures
below normal through Tuesday.
&&
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.AVIATION...18Z TAF CYCLE...
Breezy winds and VFR conditions most locations through this
afternoon, exception being the Sacramento mtns with -SN. -SHRA
increase in coverage after 00Z, with TAF locations either BCMG
VCSH, -SHRA. CIGS drop to OVC050 between 00 and 03Z, then
OVC015-030 between 06 and 09Z and any -SHRA chances to -SN as a
cold front moves in from the east. Winds become breezy during this
time, 10-15G20-25KTs, direction 010-060. VIS will decrease as
well, especially in any SN at KELP. Precipitation mostly
diminishes by the end of the TAF period.
&&
35
.FIRE WEATHER...
A cold front and upper level storm system will combine tonight to
produce rain changing to snow along and east of the Rio Grande
Valley. We are expecting heavy snows in the Sacramento mtns (6 to
10" with isolated higher amounts) and light to moderate snow along
the Rio Grande Valley (1 to 3") and eastward (3 to 5"). Most of the
precipitation will wrap up by the mid morning hours but a few
lingering snow showers will remain. Temperatures will be 20 to 35
degrees below avg on Thursday with Poor ventilation and min RH
greater then 30% all areas. Mainly dry conditions are expected
Friday through the weekend with a slow warming trend (50 in the
lowlands and near 30 across the mtns). No significant weather
features anticipated to impact the region into the early portions of
next week as temperatures warm a few more degrees.
A mix of Poor to Good ventilation is expected through this weekend
with minimum humidity in the 20 to 30% range mainly, and higher in
the Sacramento mtns.
&&
35
.PRELIMINARY POINT TEMPS/POPS...
El Paso 22 35 18 39 / 60 30 0 0
Sierra Blanca 15 27 13 31 / 70 50 0 0
Las Cruces 21 33 16 39 / 40 30 0 0
Alamogordo 16 33 10 35 / 70 50 0 0
Cloudcroft 3 15 6 20 / 90 50 10 0
Truth or Consequences 17 31 15 39 / 30 20 0 0
Silver City 18 34 16 39 / 40 10 10 0
Deming 19 35 17 39 / 30 20 0 0
Lordsburg 16 41 19 41 / 30 10 0 0
West El Paso Metro 22 36 20 38 / 50 30 0 0
Dell City 13 28 9 34 / 80 50 0 0
Fort Hancock 19 36 16 39 / 60 50 0 0
Loma Linda 15 26 12 31 / 70 40 0 0
Fabens 21 36 17 39 / 60 40 0 0
Santa Teresa 20 34 18 37 / 50 30 0 0
White Sands HQ 22 33 17 36 / 60 40 0 0
Jornada Range 19 33 14 36 / 40 40 0 0
Hatch 18 36 16 40 / 30 30 0 0
Columbus 23 37 19 39 / 20 20 0 0
Orogrande 18 33 13 35 / 70 40 0 0
Mayhill 2 22 3 30 / 90 40 10 0
Mescalero 2 23 6 29 / 90 50 0 0
Timberon 4 22 6 27 / 90 50 0 0
Winston 5 32 7 38 / 40 20 10 0
Hillsboro 14 33 15 38 / 30 20 10 0
Spaceport 12 34 14 38 / 40 30 0 0
Lake Roberts 11 35 13 40 / 50 20 20 0
Hurley 12 33 12 38 / 30 10 0 0
Cliff 8 44 14 48 / 40 10 0 0
Mule Creek 15 38 18 43 / 30 0 0 0
Faywood 14 33 16 36 / 30 20 10 0
Animas 17 43 19 41 / 20 10 0 0
Hachita 20 40 17 39 / 30 10 0 0
Antelope Wells 20 42 19 39 / 20 10 0 0
Cloverdale 20 40 21 36 / 30 10 0 0
&&
.EPZ WATCHES/WARNINGS/ADVISORIES...
NM...Winter Weather Advisory from 8 PM this evening to 11 AM MST
Thursday for NMZ410-411-413.
Winter Storm Warning from 8 PM this evening to 11 AM MST
Thursday for NMZ417.
Winter Weather Advisory from 5 PM this afternoon to 11 AM MST
Thursday for NMZ409-412.
Winter Storm Warning from 5 PM this afternoon to 11 AM MST
Thursday for NMZ414>416.
TX...Winter Weather Advisory from 8 PM this evening to 11 AM MST
Thursday for TXZ418-419-423-424.
Winter Storm Warning from 8 PM this evening to 11 AM MST
Thursday for TXZ420>422.
&&
35-Delizio/29-Crespo