Tuesday, September 19, 2017

Sep. 19 17


Northwest Houston, TX, during the early morning.
Northwest Houston, TX, during the early evening.
Northwest Houston, TX, during the early night.


Summary: The day was hot, sunny, and dry. There looked a to be a few moderately heavy to heavy showers and thunderstorms in the Houston, TX area, during the morning, afternoon, evening, and night. I felt a a few drops of rain, at work in northwest Houston, TX, sometime during the late afternoon, or maybe early evening. Alto status and stratus clouds with some stratocumulus clouds looked to cover most of the sky, during the morning, afternoon, and evening. The sky looked to have become clear, during the night. The wind speeds looked to be calm with gentle gusts and maybe some moderate gusts. It felt warm, during the early morning, late evening, and night. It felt very warm, during the mid-morning and early evening. It felt hot, almost very hot, during the late morning and afternoon. There was a Hazardous Weather Outlook issued for the Houston, TX area, by NOAA. There were no other watches, warnings, alerts, advisories, or weather statements/outlooks issued for the Houston, TX area, that I know of. The low temps looked to be in the 70's and the high temps looked to be in the 90's, for the Houston, TX area.


Houston, TX Storm Summary: There looked to be some isolated moderately heavy to heavy showers and thunderstorms in and around the Houston, TX, during the morning, afternoon, evneing, and night. There were still some road closures going on in the Houston, TX area. There were probably still some roads covered with water in the Houston, TX area. I didn't hear about any reports of any storm damage.


My Storm Summary: The clouds looked to have become darker and I felt some rain drops, while at work in northwest Houston, TX, during the late afternoon, or maybe early evening. I didn't see any wet roads, or flooding, or any lightning strikes. I didn't hear any rumbles of thunder. I didn't see any storm damage.


Locations: Northwest and west Houston, TX.


Thoughts: It felt really hot outside today, compared to yesterday and these past few weeks.\


Area Forecast Discussion 
Issued by NWS Houston/Galveston, TX
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000
FXUS64 KHGX 192352
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
652 PM CDT Tue Sep 19 2017

.AVIATION...
Widely scattered storms winding down this evening with the loss of
daytime heating. Will be keeping an eye out west with the activity
associated with an eastward moving shortwave, but will also be ex-
pecting this activity to die off shortly after sunset. MVFR to IFR
CIGS will be possible across the area overnight (particularly over
our northern inland sites)...but the best chances for some ISO WAA
type showers will be closer to the coast. With a slightly more ac-
tive southern stream jet have added the mention of VCSH for all of
the TAFS tomorrow. 41

&&

.PREV DISCUSSION... /ISSUED 316 PM CDT Tue Sep 19 2017/

More typical late summer weather in Southeast Texas for the next
several days. Several very subtle features will impact the
forecast into early next week. This makes the forecasting process
intriguing, but the impacts appear to be mostly limited to
temperature changes of a few degrees and just how scattered the
scattered showers and storms will be. Based on how how these
subtleties play out, things like preferred days for more numerous
showers may shift a bit in the coming days. However, the broad
concept of typical late summer weather seems clear. Of course,
"typical" does not always mean "no hazards". The strongest of each
day`s storms can be capable of some gusty winds and/or locally
heavy rainfall. This is the type of setup in which one gauge might
see 4 inches of rain, while another gauge nearby sees about a
third of an inch.

NEAR TERM [Through Tonight]...

A subtle, but readily apparent shortwave ridge is beginning to exit
Southeast Texas per analysis and water vapor imagery. Its impact on
today`s convection has been similarly apparent, with considerably
fewer showers and storms so far today. However, it appears the next
weak shortwave trough will begin to approach the region, and is
attended by an uptick in convective activity to our west. This may
mean a little more activity for the late afternoon until we lose
heating this evening, but we still look unlikely to match
yesterday`s activity. Temperatures today have been a little higher
than forecast as convection so far has been even more limited than
already expected. But with thoughts that clouds may tick up in the
next few hours and our lows look to be governed at least in part by
the high dewpoint floor, don`t think it will have a very significant
effect outside of these first few hours of the forecast.

SHORT TERM [Wednesday Through Thursday Night]...

By Wednesday, a new shortwave trough will be crossing the area,
which should provide some upward boost to that day`s convection.
Now, that said, this doesn`t seem to appear in all of the guidance,
which ranges from virtually dry (NAM) to decently wet. It`s worth
noting that guidance does seem to step precipitable water values
down a little from the two inch numbers we`ve seen of late, and
there may be some timing issues - a slightly faster shortwave may
put us just on the subsident side of the trough by late afternoon.
This could hamper convective development as well.

Probably don`t want to get too terribly wrapped up in the details as
the difference in impacts isn`t huge. What there does seem a clearer
signal of in the guidance is that a coastal boundary looks to be the
primary focus for convection, and we still have enough moisture to
produce locally heavy rainfall. The NCAR WRF ensemble shows a fair
to strong signal for some locally heavy rain along the coast. The
strongest signal looks to lie just east of our area closer to the
TX/LA border, but there`s surely some potential for cells dropping a
quick few inches here.

For Thursday, cyclonic flow aloft looks to stay in place, and give
us stable or slightly falling midlevel heights over the area again
on Thursday. This would bolster the idea the previous shift had that
Thursday could see one more day of relatively higher coverage in
showers and storms. This may be somewhat subject to change as the
broad eastern US ridge will be starting to amplify, and could see a
scenario in which we actually are drier on Thursday. However, given
the relative consistency in seeing a developing upper low on the
Gulf Coast in the models, will hold onto the idea of a wetter
Thursday.

LONG TERM [Friday Through Tuesday]...

Guidance continues to show a trend to an amplifying west trough/east
ridge pattern, but also with an upper low developing along the
northern Gulf Coast. Farther to the east, Jose and Maria continue to
have a tricky interaction - this dance of tropical cyclones won`t be
directly impacting our weather, but I do wonder how it may impact
the aforementioned upper low, as our precip chances this weekend
into early next week may be influenced by just how far west it gets
before being drawn back up into the northern stream westerlies.
Because of this, I try to work in broad strokes on the PoPs with
less variation than I might normally. In general, go a little lower
Friday and Saturday, and a bump up for the rest of the weekend into
early next week. This is not a significant difference from the
previous shift, which had similar trends. As far as temps go, I
don`t see heights going low enough to really imply a big shift in
temperatures, but do get a couple degrees cooler on highs as we head
deeper into the weekend.

It`s beyond the scope of the forecast, but models diverge
significantly later next week as a cold front drags into Texas and
potentially towards the area. There is precious little agreement in
the models outside of the existence of a front, however, so details
on this will have to be sussed out in the coming week.

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)      76  91  76  92  72 /  20  20  10  30  10
Houston (IAH)              77  90  77  89  73 /  20  50  20  40  10
Galveston (GLS)            81  86  80  87  78 /  20  30  20  30  10

&&

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

$$

Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Houston/Galveston TX
352 AM CDT Tue Sep 19 2017

TXZ163-164-176>179-195>200-210>214-226-227-235>238-201300-
Austin-Brazoria-Brazos-Burleson-Chambers-Colorado-Fort Bend-
Galveston-Grimes-Harris-Houston-Jackson-Liberty-Madison-Matagorda-
Montgomery-Polk-San Jacinto-Trinity-Walker-Waller-Washington-
Wharton-
352 AM CDT Tue Sep 19 2017

This hazardous weather outlook is for portions of Southeast Texas..

.DAY ONE...Today and Tonight

Chances for mainly daytime and early evening thunderstorms will
occur today. Isolated strong storms could produce strong gusty
winds and locally heavy rainfall.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Chances for mainly daytime and early evening thunderstorms will
continue through Wednesday and Thursday with isolated strong
storms producing strong gusty winds and locally heavy rainfall
possible. Thunderstorm chances are expected to diminish on Friday
and Saturday before returning Sunday and Monday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time.

$$

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