Area Forecast Discussion
Issued by NWS Albuquerque, NM

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
221
FXUS65 KABQ 231200 AAA
AFDABQ

Area Forecast Discussion...UPDATED
National Weather Service Albuquerque NM
600 AM MDT Sat Sep 23 2017

.AVIATION...
12Z TAF CYCLE
A high impact weather event is taking shape as several bands of SHRA/
TSRA spread across NM thru tonight. The biggest forecast challenge is
timing the main impact windows with these bands as they move slowly
east. The first band stretching between KGUP and KFMN is expected to
shift into the northwest mts while tapering off thru 00Z. Mainly VFR
is occurring here with a direct hit possibly bringing a brief MVFR
cig/vsby restriction. The second band is focused within the RGV and
is expected to drift eastward thru 21Z before consolidating over the
Sangre de Cristo Mts this evening. The same applies with direct hits
capable of brief MVFR cigs/vsbys. The most significant impacts are
currently over eastern NM where the third band is developing in the
area between KROW, KTCC, and KLVS. Storms with heavy rainfall will
train repeatedly over the same areas so long duration IFR impacts are
possible at KTCC and KROW by later today. There is also an area of
MVFR low cigs between KLVS and KRTN that are expected to remain in
place for much of the day. Clearing is shown by guidance to shift
slowly eastward tonight from western NM into the Rio Grande Valley.
IFR impacts with heavy rainfall may continue thru around sunrise at
KTCC and KROW.

Guyer

&&

.PREV DISCUSSION...337 AM MDT Sat Sep 23 2017...
.SYNOPSIS...
Numerous showers and storms expected today over eastern New Mexico,
capable of producing heavy downpours and flash flooding concerns.
Storm activity will slide east into western Texas Sunday, leaving
most of New Mexico fairly dry. A cold front will lower temperatures
and bring in much drier air across the west, allowing for a few spots
to see near freezing temperatures Sunday and Monday mornings across
the west. A backdoor front arrives Monday, reigniting the chance for
afternoon storms across the east and central mountain chain. Highs
will be below normal through the end of next week.

&&

.DISCUSSION...
An upper low remains situated over the Great Basin this morning with
southerly flow continuing to bring up increased sfc moisture into
New Mexico. A strong baroclinic zone where a rather potent jetmax
will be rotating around this upper low, sliding E over New Mexico,
will combine with the increased sfc moisture to produce numerous to
widespread showers and storms over much of eastern New Mexico,
starting as early as later this morning. There`ve already been a few
storms pushing N into southeastern NM early this morning.

Storm motion is expected to be rather quick to the N, with storms
capable of producing brief heavy downpours. The widespread coverage
of storms and potential for storms to train over the same area has
prompted a Flash Flood Watch for much of eastern New Mexico this
afternoon into Sunday morning. Storm coverage will gradually shift
east into western Texas by Sunday morning.

A cold front will push through western NM Sunday lowering overnight
lows well below average across the west. Much drier air will also
flow into western NM allowing a few spots across the NW to see near
freezing lows Sunday and Monday mornings. A backdoor front will
slide into eastern and central NM Monday allowing for another round
of afternoon storms across the east. There remains timing differences
with the NAM12 more bullish pushing the front to the continental
divide Monday evening, while the GFS doesn`t push past the ctrl mtns
until Tuesday. The NAM12 solution would push storm chances further
west Monday, while the GFS will be limited to the central mtn chain
at the furthest. Took a split between the two for PoPs Monday
afternoon, so PoPs for the RGV could trend further up or down
depending on future model consistency.

The upper low will open and move off to the NE Monday into Tuesday,
with a leftover shortwave appendage deepening and forming its own
closed low somewhere over the CA/AZ border by Wednesday. This will
keep Gulf moisture flowing into southern NM through the end of next
week, and with the chance for afternoon storms. The better chances
will remain over the southern high terrain while the northern mtns
will see slightly less coverage. Daytime highs will be below avg
through the week, while overnight lows will rebound back to above
normal areawide by Wednesday morning.

24

&&

.FIRE WEATHER...
Moisture is surging north across central and eastern NM ahead of an
approaching upper level wave today. Widespread showers and storms
are already developing from the Rio Grande Valley eastward into the
plains. Rainfall amounts will range from a 0.10-0.30" within the
central valley to between 2 and 5" across eastern NM, thus leading
to significantly better soil moisture than the past couple weeks.
Meanwhile, a potent dry slot within the base of the upper wave will
be arriving over western NM this afternoon.

Lingering showers and storms over eastern NM Sunday morning will be
shoved east by the approaching dry slot. Humidities will trend much
drier as dewpoints fall into the teens as far east as the central mt
chain. A lack of stronger winds and cooler temps Sunday will the
limiting factor for critical fire weather conditions. Dry air, clear
skies, and light winds Sunday night will lead to the coldest temps
of the season so far for central and western NM. Widespread freezing
temps are likely for all the high terrain and elevated plateaus and
valleys of northern and western NM.

Monday will feature much of the same for western NM with very low
humidity and slight afternoon breezes. A back door cold front will
surge westward across eastern NM and arrive within the Rio Grande
Valley by late day. Another round of showers and storms is expected
across the central high terrain and portions of eastern NM. Moisture
will attempt to surge west across the Cont Divide Tuesday morning
while another upper level wave takes shape over the Great Basin.

Extended guidance continues to struggle with the placement and
duration of the impacts of the second upper wave. Despite model
differences the overall message will be that of increasing chances
of showers and storms over NM with higher humidity, thicker cloud
cover, and cooler temps through the end of next week.

Guyer

&&

.ABQ WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch from noon MDT today through late tonight for the
following zones... NMZ526-530>540.

&&

$$



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.