Tuesday, November 29, 2016

Nov. 29 16

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


Notes: Very dense fog in northwest Houston, TX turned into moderate dense fog in west Houston, TX during the early morning. The fog looked to have left west Houston, TX and turned into bright white to light grey, puffy, low stratus clouds in west Houston, TX during the mid-morning. The stratus clouds looked to cover most of the sky in west Houston, TX, during the late morning, afternoon, and early evening. Bright white, maybe light grey, puffy, low stratus clouds looked to cover most of the sky in northwest Houston, TX during the late evening. Bright white, puffy, high stratus clouds looked to be widely scattered across the sky in northwest Houston, TX during the early night. The wind speeds were calm in northwest and west Houston, TX, during the early morning. The wind speeds looked to be mostly calm with maybe some moderate gusts in west Houston, TX, during the mid and late morning, afternoon, and early evening.  The wind speeds looked to be mostly calm with maybe some moderate gusts in northwest Houston, TX during the late evening and early night. It felt warm and humid in northwest and west Houston, TX during the morning, afternoon, evening, and night. There looked to be a few isolated showers and thunderstorms on the radar, near and maybe in the Houston, TX area during the morning, afternoon, evening, and maybe night.

Thoughts: There wasn't as much rain in the Houston, TX area as foretasted from the passing cold front, for both Monday and Tuesday. I was really hoping to see some thunderstorms, or heavy rain with the passing cold front, but that's ok, maybe next time. Houston, TX did get some decent showers. It looks like we might get some heavy rain this weekend, and cooler temps too! I was surprised to see, as you'll see in NOAA's forecast discussion that there were some record highs broken in the Houston, TX area. I knew it was abnormally hot today, but I didn't know it was hot enough to break a record.

Disclaimer: This was my observation of the weather that occurred in northwest and west Houston, TX, where I was during the day.



Hazardous Weather Outlook

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
412 PM CST TUE NOV 29 2016

TXZ213-214-226-227-235>237-010730-
BRAZORIA-CHAMBERS-FORT BEND-HARRIS-JACKSON-MATAGORDA-WHARTON-
412 PM CST TUE NOV 29 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

NO HAZARDOUS WEATHER WILL OCCUR.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

AN UPPER LEVEL LOW OVER THE BAJA GULF OF CALIFORNIA REGION...IN
TANDEM WITH A DEVELOPING NEAR COASTAL SURFACE TROUGH...WILL PRODUCE
A FRIDAY INTO THE WEEKEND PERIOD OF MODERATE LOW TO LOCALLY HEAVY
PRECIPITATION. HIGHER MOISTURE CLOSER TO THE COAST WILL HAVE
HIGHER PROBABILITIES OF EXCESSIVE RAINFALL LEADING TO FLOODING
CONCERNS FOCUSED OVER COASTAL COUNTIES. COASTAL RUNUP MAY
BE AN ISSUE THIS WEEKEND.

.SPOTTER INFORMATION STATEMENT...

HEIGHTENED SPOTTER AWARENESS FRIDAY THROUGH SUNDAY.


$$


Area Forecast Discussion 
Issued by NWS Houston/Galveston, TX

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000
FXUS64 KHGX 300307
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
907 PM CST Tue Nov 29 2016

.DISCUSSION...
Based on radar fine lines, the cold front was located from near
KJAS in east TX to KLVJ (Pearland) and then SW to KBYY (Bay City).
The front appears to be moving fairly slowly, maybe 5 mph. Latest
HRRR model trends have the front pushing off the coast after
06z/midnight and then accelerating south. Radar still shows a few
lines of showers/storms in the Gulf but remain rather weak due to
capping aloft evident by ACARS soundings as well as the 00Z CRP
sounding. CRP sounding had temps of 10C at 700mb, 20C at 850mb.
Surface obs also showed a few isolate areas of fog developing
south of the front. Mainly visibility has dropped to around 3 to
5 miles along the coast and just off shore. The front should erode
the fog the next couple of hours. We are certainly not expecting
dense fog to quickly form like last night.

Main changes to the forecast were to just update for on going
trends with the front pushing south. Minimum temps may not be
quite as cool along the coast since it will take some time for
cold air advection to take place.

As for this coming weekend, I think the previous discussion covers
the potential rain event. Despite some model differences, I`ll
sum up by saying "It gonna rain".

Overpeck

&&

.PREV DISCUSSION... /ISSUED 535 PM CST Tue Nov 29 2016/

AVIATION...
For most sites, dry air on northwest flow should keep fog from
being an issue tonight. However, with a boundary stalled just
inland of the Gulf shore, this seems unlikely at GLS, which
should see some fog develop before gusty northwest winds on a cold
front blast dry air in. Went with MVFR conditions now, on chance
that stalled boundary drifts southward this evening, but potential
for IFR definitely exists and may be cause for later amendments.

Other challenge will be how and when winds get gusty as cold front
works through. In collaboration with the CWSU, agree on bringing
in gustier winds a little after winds just off the surface
increase. Along with that, the narrow band of clouds near the
coast should also depart the area.

PREV DISCUSSION... /ISSUED 408 PM CST Tue Nov 29 2016/

DISCUSSION...
The frontal boundary responsible for thunderstorms across parts
of the Brazos Valley and Piney Woods earlier this morning as it
lifted north is now sagging south across the region this
afternoon. Surface analysis shows this boundary snaked from Edna
to Katy to Dayton, with satellite imagery showing enhanced cumulus
developing along the boundary. Despite this, convection this
afternoon has been largely limited as warm air advection at 850
and 700 MB has resulted in a strengthening cap across the Houston
metro. Low level warm air advection today has also resulted in a
few locations reaching or setting record high temperatures, with
Houston Intercontinental having reached at least 84 degrees as of
4 PM (which would exceed the record of 83 set in 2006).

Cannot rule out a few showers developing underneath this cap as
the boundary slowly sags towards the coast this afternoon, with
scattered showers and thunderstorms blossoming over the coastal
waters and extreme southeastern counties this evening as a
secondary cold front across North and Central Texas sweeps off the
coast this evening and tonight. May see a few of the storms across
the coastal waters become strong to marginally severe, but this
activity will continue to move into the northern Gulf and away
from the Upper Texas coast with the associated front. Until the
cold front moves off the coast tonight and ushers in drier air,
may see some patchy fog across the bays and nearshore waters with
warm, moist air pooled right along the coast. Otherwise, expect
overnight lows in the low 40s to mid 50s.

Surface high pressure building into the region in the wake of
tonight`s front will result in dry, cooler weather for the region
on Wednesday and Thursday. Elevated north winds (15-20 MPH) and
relative humidity values falling to near 25 percent during the
afternoon tomorrow will result in elevated fire weather conditions
for most inland areas tomorrow afternoon, but decreasing winds on
Thursday will help limit overall fire weather concerns. Expect
highs Wednesday and Thursday to be in the 60s with lows ranging
from the upper 30s across the extreme northern counties to mid 50s
along the coast.

Attention then turns to the upcoming weekend as energy from an
upper trough approaching from the west cuts off over northern
Mexico. Surface high pressure shifting into the southeastern US on
Friday will allow moisture to begin surging into the region, aided
by the development of a coastal trough along the Middle Texas
coast. Southwest flow aloft combined with enhanced low level
convergence from the coastal trough will result in periods of
showers and thunderstorms across Southeast Texas in the Saturday
through Monday timeframe. With precipitable water values climbing
to near 1.7 inches along the coast, have increasing concerns for
heavy rain to impact parts of the Upper Texas coast. Medium range
guidance has come into better agreement on the overall upper
pattern evolution, but still offers different timing on when the
upper low will lift across Texas and placements on the coastal
trough that develops (which would affect which areas see the
heaviest rain). Regardless, this weekend looks cool, wet, and one
to watch for heavy rain impacting parts of the Upper Texas coast.

Huffman



&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)      46  65  40  66  45 /   0   0   0   0   0
Houston (IAH)              54  67  42  67  46 /  10   0   0   0   0
Galveston (GLS)            61  68  54  65  58 /  20   0   0   0   0

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
GM...SMALL CRAFT SHOULD EXERCISE CAUTION from 6 AM CST Wednesday
     through Wednesday morning for the following zones: Coastal
     waters from Freeport to the Matagorda Ship Channel out 20
     NM...Coastal waters from High Island to Freeport out 20
     NM...Matagorda Bay.

     Small Craft Advisory from 6 AM to noon CST Wednesday for the
     following zones: Waters from Freeport to the Matagorda Ship
     Channel from 20 to 60 NM...Waters from High Island to
     Freeport from 20 to 60 NM.

&&

$$

Discussion...39

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