Tuesday, October 20, 2020

Oct. 20 20

Beltway 8 and I-10, on my way to work, during the early morning.
Tanner near Eldridge, on my way home from work, during the late evening.

Summary: White to grey stratus clouds were scattered across the sky, during the morning, afternoon, evening, and night. The wind speeds were light with moderate gusts. The day was warm. There was 0 percent chance for rain for the Houston, TX area. Maybe a 20 percent chance for rain for some of the coastal areas. I did not see or hear about any rain anywhere in the Houston, TX area, during the day. I did not feel, or see any raindrops. 

Area Forecast Discussion
Issued by NWS Houston/Galveston, TX

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000
FXUS64 KHGX 202019
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
319 PM CDT Tue Oct 20 2020

.SHORT TERM [through Wednesday Night]...

An area of deep low-level convergence has developed along the coast
and into Chambers County today. This activity is also being
triggered by low to mid level warm air advection. Instability
remains from 5 to 7 C/km, therefore, storms have struggled to
develop and has been isolated in nature. Additional showers with
a few lightning strikes cannot be ruled out along and east of
I-45 through sunset.

Forecast soundings suggest sufficient boundary layer moisture to
allow for stratus and patchy fog development overnight into
Wednesday morning. Fog should dissipate by early to mid morning as
daytime boundary layer mixing occurs.

Similar weather conditions are expected on Wednesday as warm
south to east winds persist. Highs will generally be in the mid to
upper 80s. There is a slight chance for showers/storms during the
day (mainly over Jackson, Wharton and Matagorda counties) thanks
to daytime heating, low-level moisture and weak forcing traversing
along the flow aloft. 05


.LONG TERM [Thursday through Tuesday]...

High pressure over the mid Atlantic and weak low pressure over the
southern Gulf will allow for east winds on Wednesday and Thursday. It
will remain warm and humid as 500 mb heights remain high and 850 mb
temps remain near 18 C. The low level flow will become more NE on
Friday as the weak and broad Gulf circulation moves north. A 1036 mb
area of high pressure will push south late Friday and drive a cold
front into and ultimately across the state. The surface high will
weaken and this feature shifts more east than south Friday night but
pressure rises behind the front look strong enough to drive the
front into the coastal waters. Convergence along the boundary looks
weak with surface winds already NE on Friday. The NE flow will also
be a dry flow so moisture looks minimal with PW values below 1.35
inches. The front will bring slightly cooler temperatures to the
area on Saturday. The respite from the unseasonably warm
temperatures on Saturday will be short lived as onshore winds return
by Saturday night and temperatures on Sunday will warm back up into
the mid/upper 80s.

By the beginning of next week, our attention remains on the approach
of a second and stronger cold frontal boundary. The on again/off
again cold front is on again with the GFS and ICON and off again
with the ECMWF and the Canadian. The GFS solution brings a strong
cold front through the area Monday night with much colder
temperature filtering into the area with period of showers and
embedded thunderstorms. The ECMWF doesn`t bring the cold front
through 240 hours. The primary differences between the models
appears to be how they resolve the 500 mb flow. The ECMWF/Canadian
hold the upper trough well to the west while the GFS and ICON are
more progressive with the upper trough and move it east by Wednesday
night. Once the front is in the state on Monday night, the pressure
rises in the TX panhandle look more than sufficient to drive the
front southward and off the coast. At 12z Tuesday, mslp at KAMA will
be around 1034 mb and at BRO, it will be around 1012 mb. Will lean
toward the GFS/WPC solution but confidence remains low at this time.
43


.MARINE...
Surface high pressure centered to our east will continue to bring
onshore flow across our Gulf waters. Light easterly winds from 8
to 15 knots will persist through late Friday. Seas between 4 and 6
ft will continue through the end of the week across portions of
the offshore waters. This may require caution flags across this
region through late Thursday. Offshore flow returns on Saturday
as a weak cold front moves through. Winds will shift back to the
east- southeast Saturday night. 05

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)      69  87  68  86  68 /   0  10   0  10   0
Houston (IAH)              69  87  70  85  70 /   0  10   0  10   0
Galveston (GLS)            75  83  75  82  75 /   0  10   0  20  10

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
GM...NONE.
&&

$$

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