Monday, September 7, 2020

Sep. 7 20

 The sky looked to be clear with some possible high, white, stratus clouds scattered across the sky, during the early morning, at my house in northwest Houston, TX. Low white/light grey stratus clouds started to cover most of the sky, during the mid-morning, at my house in northwest Houston, TX. I could hear low rumbles of thunder, while I was talking to my older sister who was swimming in our pool, during early afternoon, at my house in northwest Houston, TX. The low white/grey stratus clouds lasted through the evening, in my neighborhood in northwest Houston, TX. Mid to high white stratus clouds looked to be scattered across the sky, at my house in northwest Houston, TX, before I went to bed, during the early night. I felt only a few drops, during the early afternoon, at my house in northwest Houston, TX. No more rain other than that. The thunderstorm never made it to my house. The day was very warm, almost hot. 

Area Forecast Discussion
Issued by NWS Houston/Galveston, TX

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000
FXUS64 KHGX 072331
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
631 PM CDT Mon Sep 7 2020

.AVIATION...
Other than a few very small isolated shra right off the coast,
precip has pushed north of UTS and the southeast Tx terminals. VFR
skies should persist into the overnight hours. Some guidance does
show some MVFR cigs developing in the 9-12z timeframe, but majority
just show a few/sct deck which is what was advertised in the 00z
TAF package. Look for some shra/tstms to begin developing out
toward the Matagorda Bay area as we head closer to sunrise in
association with an upper level disturbance moving in from the
wsw. Sct precip will expand to the e/ne as the day
progresses...eventually tapering off Mon evening. Outside of any
stronger cells, VFR conditions should prevail.  47

&&

.PREV DISCUSSION... /ISSUED 401 PM CDT Mon Sep 7 2020/
SHORT TERM [Tuesday Through Wednesday Night]...
Cluster of storms moving through the Metro and appear to be
outflow dominated with storms weakening and new cells popping up
on the north and northwest periphery of the outflows. Some drier
air evident over the northwestern counties so anticipating the
continued north and northeastward expansion of the storms and the
demise of the storms near the coast and the coastal waters through
late afternoon. Storms wane quickly with the loss of heating and
should be a quiet night with skies clearing over much of the area
then some patchy clouds developing toward morning and expanding
northwest. Warm temperatures will be the norm and not much relief
in the short term other than a downpour this afternoon and
overnight. Tuesday should be a repeat but that storms will
probably start out in the southwest areas (rather than Galveston
Bay area today) and expand inland before and shortly after
sunrise. Greater coverage expected Tuesday with higher moisture
levels across the area and strengthening onshore flow. More clouds
expected across the region Tuesday both with the CU field and the
mid/high clouds from convective debris. Heat indices should be
lower as should the high temperatures with the decrease in
insolation. Scattered showers and thunderstorms through the
afternoon hours and will be leaning strongly toward the 30-50 POP
range for Tuesday.  45

LONG TERM [Tuesday Night Through Monday]...
Low-level moisture availability will continue to be on the rise
on Tuesday night with global models showing most of the CWA
reaching above 2.0 inches of surface PW, driven by a persistent
onshore wind. As a result, scattered shower and thunderstorm
activity should continue overnight as an upper disturbance
continues to push through the area. The greatest rainfall
potential through Wednesday should generally remain west of the
I-45 corridor, where near-surface moisture continues to appear
most abundant across the past several model cycles.

The main focus in the extended period continues to be the approach
(or lack thereof) of a surface cold front as we head into the
middle of the work week. What once looked like a strong cold
frontal passage now is no longer expected bring the first taste of
autumn to the region. The GFS and ECMWF 12Z runs continue to
favor the slower progression of an an advancing surface cold front
on Wednesday, with the boundary expected to reach N Texas by
Thursday morning. Both solutions maintain yesterday`s trend of
stalling the front northwest of the CWA and later moving a more
diffuse boundary into SE Texas by late Thursday, thereby keeping
things in the Houston area hot, humid, and generally unpleasant
for at least a little while longer. The NAM, which was initially
the most aggressive in its depiction of the advancing boundary,
has fallen in line with these solutions as well. With that being
said, should still see a transition to an offshore wind by early
Friday which will provide some drier air to the area. Although
this won`t be the dramatic change we initially anticipated, look
for a slight drop off in dew points with values in the upper 60s
not out of the question across the northern zones.

Conditions still appear favorable for the development
of showers and thunderstorms across most of the area through the
end of the week and into next weekend. With S/SE winds looking to
persist well into Thursday, near-surface moisture should remain
fairly abundant and convective temps in the low 90s should be
easily reachable. Have continued to maintain mostly 30-50% PoPs
as a result. Heading into the end of the weekend next week, ECMWF
& GFS continue to show the approach of an inverted trough which
may bring more widespread precipitation to the area.  Cady

MARINE...
The light winds across the coastal waters this afternoon will be
coming to an end as gradient starts to tighten up late
tonight/Tuesday and will be getting into SCEC conditions possible
Tuesday evening. Persistent SE winds Tuesday through Wednesday
afternoon then start to back as cold front moves down into the
state and slows. Easterly winds Wednesday should back on around to
the northeast Thursday morning. Wind speeds still have a large
question mark over how high they get Thursday night-Saturday
because of the uncertainly on the cold front`s progress. In
general have kept with 8-14kt NE winds Thursday through Saturday
but these could change. Rain chances in the form of showers and
thunderstorms will be on the increase as well with the proximity
of the cold front. 45

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)      75  91  74  88  68 /  10  50  30  60  30
Houston (IAH)              78  93  77  91  76 /  20  40  20  50  20
Galveston (GLS)            83  89  82  88  82 /  20  40  20  40  30

&&

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

&&

$$

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