#2880 Postby weatherdude1108 » Fri Feb 07, 2020 4:37 pm
Great pattern for rain! We need it as we approach the Spring months to get those roots nourished.
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FXUS64 KEWX 072053
AFDEWX
Area Forecast Discussion
National Weather Service Austin/San Antonio TX
253 PM CST Fri Feb 7 2020
.SHORT TERM (Tonight through Saturday Night)...
After a cold morning start a large diurnal swing in temperatures has
occurred across South Central Texas this afternoon, given the dry
airmass in place, mostly clear skies and southwest to west-northwest
downsloping flow. An impressive 40-45+ deg temperature swing from
morning low to afternoon high temperatures has occurred in some
locations. We will again seen a large drop in temperatures tonight,
although not as low as last night.
A shallow moisture return from the Gulf of Mexico is forecast to
arrive back into southern areas early Saturday morning and spread
north and northeast through the day. We should see a return of low
clouds in the morning and into the early afternoon from south to
north, along and east of the I-35 corridor. Slightly cooler for high
temperatures tomorrow across central and eastern areas, where the
low level moisture return is taking place.
The southerly low level flow and moisture depth will steadily
increase late Saturday night into Sunday morning. This should allow
patchy rain and drizzle to develop along and north of the escarpment
early Sunday morning. Much warmer overnight lows Saturday night into
Sunday morning given the moisture return and southerly winds.
&&
.LONG TERM (Sunday through Friday)...
The weather pattern will become increasingly active across south
central Texas as we head into early next week. On Sunday, southerly
flow in the low-levels will result in increasing moisture levels
across all areas. Some morning fog and drizzle can be expected across
most of the region through mid-morning Sunday. To our west, a deep
upper low will be dropping southward into California. Ahead of this
upper low, we will see increasing southwest flow aloft across Texas.
A subtropical jet will set up across the central and southern
portions of the state. This will result in rain chances returning to
most areas Sunday morning, except along the Rio Grande. The models
continue to indicate some elevated instability and we will continue
to forecast thunderstorms on Sunday for areas east of Highway 83. A
cold front will approach from the north late Sunday night into early
Monday, resulting in an increase in rain chances for all areas for
the mentioned time period. With plenty of cloud cover, rain chances
and cold air advection in the low-levels, we will opt to lower
forecast highs on Monday. Cold air continues to build in from the
north on Tuesday and with the approaching upper low and subtropical
jet aloft, we will likely see more scattered showers and
thunderstorms on Tuesday.
As the upper level system approaches the region during the middle of
the upcoming work week, the medium range models begin to diverge in
handling the overall structure and speed of this system. The ECMWF
shows more of a slower, closed low moving in across west Texas on
Wednesday, while the GFS depicts an open trough and faster eastward
progression. This will certainly have impacts on our rain chances
through mid-week, but as of now we will maintain continuity with the
previous forecast and show the higher chances Tuesday night into
Wednesday. If this system slows down, we may need to extend higher
rain chances into Thursday, especially along and east of the I-35
corridor. Until a clearer model solution appears, we will show a
decrease in rain chances from west to east beginning Thursday. As
for expected rainfall totals with this event (Sunday through
Thursday), we should are currently forecasting average amounts around
1/2" along the Rio Grande, with amounts ramping up fairly quickly as
you head east into the southern Edwards Plateau, Hill Country and
I-35 corridor (1-2"). Some 2-2.5" amounts are possible for our
northeastern counties, including Williamson, Travis, Bastrop and Lee.
while these amounts will likely change with future model runs, there
is good support from the ECMWF and GEFS Ensemble precipitation
amounts. This would certainly be beneficial to south central Texas
given the ongoing drought conditions.
Dry weather is currently anticipated for Friday with highs close to
climatological normals. Looking just beyond the range of the
current forecast period shows an active weather pattern is likely to
continue across the southern plains states.
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