Area Forecast Discussion
Issued by NWS Dallas/Fort Worth, TX

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409
FXUS64 KFWD 100555 AAB
AFDFWD

Area Forecast Discussion...UPDATED
National Weather Service Fort Worth TX
1155 PM CST Fri Dec 9 2016

.AVIATION...
As a surface ridge that extended from Illinois southwest through
Southeast Texas moves eastward, the east to southeast winds at
speeds of 4 to 6 knots will become south at around 10 knots
before 12z Saturday. Winds speeds will increase to 10 to 15 knots
by midday Saturday. VFR conditions are expected to prevail
through the daytime hours Saturday in the Metroplex and ceilings
are expected to lower into the MVFR category by 03z Sunday. At
Waco, expect mostly VFR conditions through early afternoon with
ceilings maybe lowering to MVFR by 21Z. Ceilings are expected to
lower to around 1500 feeet by 03z Sunday.

58

&&



.PREV DISCUSSION... /ISSUED 356 PM CST Fri Dec 9 2016/
Afternoon satellite imagery shows cloud cover holding strong
across much of the area mainly along and north of Interstate 20.
South of the Metroplex...skies have become mostly sunny and
temperatures have responded upward into the mid 40s. These clouds
should continue to thin over the next few hours with skies
becoming mostly clear later this evening. This will allow
temperatures to fall back into the upper 20s and lower 30s
areawide by tomorrow morning.

With the large surface high pressure center now shifting to the
east of the area...surface winds are gradually becoming more
southeasterly. These winds will increase substantially during the
day Saturday as surface pressures fall in the lee of the Rockies
ahead of a fast moving upper disturbance. In response...low level
moisture will surge northward through the day Saturday into
Saturday evening. Highs on Saturday will likely be in the lower
50s although temperatures won`t fall much more than that Saturday
night as the boundary layer continues to moisten and warm. By late
Saturday night into Sunday morning...areas of drizzle or light
rain are expected to develop. The most favored area will be along
and east of I-35 into our eastern counties where the best moisture
advection will be occurring. 20-30% PoPs are currently forecast
through midday Sunday in these areas. It looks like we`ll remain
strongly capped to deeper convection...so showers or areas of
drizzle look to be the main precip type. With strong
south/southwest winds during the day Sunday...temperatures will
warm back into the 70s areawide. A weak cold front will move into
the region late Sunday night which will cool things back down a
tad for Monday. Highs on Monday will be in the low to mid 60s.

As we get into the middle of the week...fast zonal flow will
prevail across much of the CONUS but a large upper low will swing
through much of southern and eastern Canada. This upper low over
Canada is tied to some significantly colder air and will be the
source region for another cold front on Wednesday. At this time
the model guidance handles the position of the large Canadian low
reasonably well through mid week...although there is considerable
uncertainty with respect to amplification of heights over the
western U.S. during this time. If we do indeed amplify over the
western U.S. through late Tuesday...then it will be more likely
that the coldest air will slide to the east of our area.
However...if we stay more zonal then colder air will tend to slide
southward into our region.

For now...will continue with the consensus which is in line with
the previous forecast and show a rather strong cold front arriving
on Wednesday. If the guidance continues to suggest that the
coldest air will be east of here...then we will need to raise
temperatures through the mid/late week timeframe. As of now...it
does appear that precipitation chances will be quite low through
the upcoming week.

Dunn



&&


.PRELIMINARY POINT TEMPS/POPS...
Dallas-Ft. Worth    29  52  49  74  47 /   0   0  10  10   0
Waco                30  52  50  71  49 /   0   0  20  20   5
Paris               28  49  42  67  46 /   0   0  20  20  10
Denton              27  51  46  73  41 /   0   0  10  10   0
McKinney            29  49  45  70  44 /   0   0  20  20   0
Dallas              31  54  50  73  48 /   0   0  10  10   0
Terrell             28  50  47  69  48 /   0   0  20  20   5
Corsicana           31  52  49  71  53 /   0   0  20  20   5
Temple              31  50  48  70  51 /   0   0  20  10   5
Mineral Wells       27  56  46  73  40 /   0   0  10   5   0

&&

.FWD WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

58/14



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