August 2017: Looking Back at Harvey 5 Year Later

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Texaspirate11
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We now have #Harvey.
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Thank goodness this board is back up.
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Thanks for being patient today with our outage. A special thanks to KHOU Web Director Christine, Brooks and Doug for working quickly with our Server Provider to correct the problem. The Forum was never under a hack threat... ;)
Carla/Alicia/Jerry(In The Eye)/Michelle/Charley/Ivan/Dennis/Katrina/Rita/Wilma/Humberto/Ike/Harvey

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weatherrabbit wrote:Thank goodness this board is back up.

I agree! My morning just wasn't the same without being able to check in here first.
Thank to all involved for all the work done in getting this forum back up and going again. :D
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weatherrabbit wrote:Thank goodness this board is back up.

Ditto.
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BlueJay wrote:
weatherrabbit wrote:Thank goodness this board is back up.

I agree! My morning just wasn't the same without being able to check in here first.
Thank to all involved for all the work done in getting this forum back up and going again. :D
Me too!
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srainhoutx
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TS Harvey appears to be slowly getting stronger. Overshooting Thunderstorm activity looking more favorable and RECON is finding slowly falling pressure at the center of circulation.
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Scott747
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Long term 92l might be of more interest for our neck of the woods then Harvey...
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Texaspirate11
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Scott747 wrote:Long term 92l might be of more interest for our neck of the woods then Harvey...
I agree.
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Texaspirate11 wrote:
Scott747 wrote:Long term 92l might be of more interest for our neck of the woods then Harvey...
I agree.
We still need to keep an eye on Harvey though. 12z Euro had a decent shift N with a hint on Tampico.

I think one of the two will at least make it into the Gulf. Now at what intensity is anybody's guess. Plenty of wrenches for both....
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The 18z navgem is a bit further north also.
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which blob is 92L?
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Texaspirate11
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Scott747 wrote:
Texaspirate11 wrote:
Scott747 wrote:Long term 92l might be of more interest for our neck of the woods then Harvey...
I agree.
We still need to keep an eye on Harvey though. 12z Euro had a decent shift N with a hint on Tampico.

I think one of the two will at least make it into the Gulf. Now at what intensity is anybody's guess. Plenty of wrenches for both....
Tonights models has 92L going into Mobile Al/Pensacola Fla.
But of course its way to early
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PTC 9 was upgraded this afternoon to TS Harvey located 250 miles E of Barbados in the Windward Islands this evening. Invest 92L is also looking more organized this evening with a burst of convection over the center. The tropics are alive and well and should be a strong reminder to have your hurricane plans ready if they are needed during the next 6-8 weeks.
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92L remains one to potentially watch in the GOM.

Image


ZCZC MIATWOAT ALL
TTAA00 KNHC DDHHMM

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
200 AM EDT Fri Aug 18 2017

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

The National Hurricane Center is issuing advisories on Tropical
Storm Harvey, located just east of the Windward Islands.

1. Shower and thunderstorm activity associated with an area of low
pressure located about 900 miles east of the Leeward Islands
continues to show signs of organization. While this system
does not yet appear to have a closed circulation, only a slight
increase in organization could lead to the formation of a tropical
depression before upper-level winds become less favorable for
development early next week. The low is expected to move
west-northwestward at about 20 mph during the next few days, and
interests in the northern Leeward Islands should monitor the
progress of this disturbance.
* Formation chance through 48 hours...high...70 percent.
* Formation chance through 5 days...high...70 percent.

2. A tropical wave located over the far eastern Atlantic Ocean a few
hundred miles west and southwest of the Cabo Verde Islands
continues to produce disorganized showers and thunderstorms.
Environmental conditions are forecast to become more favorable for
some development early next week while the system moves west-
northwestward to northwestward at about 20 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 5 days...low...30 percent.

Public Advisories on Harvey are issued under WMO header
WTNT34 KNHC and under AWIPS header MIATCPAT4.
Forecast/Advisories on Harvey are issued under WMO header
WTNT24 KNHC and under AWIPS header MIATCMAT4.

Forecaster Blake
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Well the 0z Euro wants us to make Harvey the main topic of conversation today.

Already some wild swings and likely more.
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srainhoutx
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Well the 00Z ECMWF decided to throw a curveball with Harvey tonight for those of us along the Texas/ SW Louisiana Coast. Certainly not an exact track and intensity forecast that we should take as Gospel 10 days out, but it serves as a reminder that anytime we get a Tropical System cruising through the Caribbean, we need to get an eye on forecast trends over the next 5 days or so.
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Looking ahead to the forecast expected next week, the Weather Prediction Center Day 3 to 7 Surface Charts suggest a frontal boundary stalling across the Northern Gulf Coast States into the Mid Atlantic Region later next week.
5dayfcst_wbg_conus(7).gif
The TUTT feature (Tropical Upper Tropospheric Trough) currently situated across portions of Cuba and the Bahamas is expected to meander West across the Gulf of Mexico this weekend into early next week before shearing out or filling in over S Texas leaving a weakness across the NW Gulf.
wv-l.jpg
Interests from Guatemala to Grand Isle should monitor trends and forecasts throughout the weekend into early next week. This has a potential to being a far more complicated and complex forecasting challenge than what was previously thought to be a straightforward track into Central America.
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cperk
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I'm not surprised at all at that Euro run last night,the Navgem started to hint at a northward shift also.Only one run though i will watch the models with great interest today and throughout the weekend.
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00
FXUS64 KHGX 181131
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
631 AM CDT Fri Aug 18 2017

.AVIATION...
Surface high pressure is continuing to fill into the NW Gulf of Mexico,
keeping our winds mainly out of the SW/S. Winds should remain
between 5-10 kts across SE TX through the period. Lower ceilings
in the forecast for the northern TAF sites, should begin to lift
and mix out by 15Z with the help of daytime heating. Otherwise,
VFR conditions expected to prevail. Additionally, decided to keep
VCSH out of all TAF sites. If we do get some showers thinking the
coverage would be more isolated and mainly impact LBX and GLS
between 12-15Z, potentially lingering into the HOU vicinity by
early afternoon. With low PWs and short term guidance showing such
sporadic coverage, not confident enough that these showers make
it into the vicinity of the coastal TAFs sites. Although, there is
still the potential that one or two of these isolated showers
could essentially move over or into the vicinity of LBX/GLS/HOU
beginning mid-morning to early afternoon.

Hathaway

&&

.PREV DISCUSSION... /ISSUED 416 AM CDT Fri Aug 18 2017/

DISCUSSION...
Yes summer time doldrums are here. But on the plus side
temperatures at 3AM are actually in the 70s instead of the low
80s like the last couple mornings. Yay. The heat index at
Galveston is only 96 not 101 like yesterday morning. Galveston may
not set another record high minimum temperature today which they
have done the last 3 or 4 days. Houston HOU is down to 81F so far
and could drop into the 70s with near calm winds. Their streak of
record high minimums could come to an end too. The heat will still
be the main weather story going into the weekend. Heat index
values especially along the coast will be in the mid 100s, but
there should be enough mixing with SW/S flow for inland areas to
see a drop in dewpoints and heat index values only in the low
100s. This heat can still be dangerous so take recommended
precautions to deal with the heat.

Aloft the weather pattern still features elongated ridging which
will limit convection again today and one of the reasons why it
will be hot outside with high temperature in the upper 90s. Upper
level troughing will stay over the northern U.S. mainly over the
Great Lakes region. We are still in that time of year where we
will need to look east or even southeast to see what will be the
next weather maker. In this case, there is a tropical upper
tropospheric trough (TUTT) over Cuba and the Bahamas. This TUTT
should move into the Gulf the next few days and the part of the
TUTT favoring upward vertical motion should be over SE Texas by
Monday. So rain chances will remain low through the weekend with
an increase in rain chances Monday and Tuesday. Precipitable water
values are expected to be around 1.6 to 1.8 inches on Monday so
not a lot of moisture for this time of year. PW increase closer to
2 inches on Tuesday but still only enough to support scattered
showers and thunderstorms. PoPs of 30-40 percent look on track for
this part of the forecast.

By the middle to end of the week, synoptic models either shear out
the TUTT or dissipate it over S Texas and Rio Grande through
Friday. This does leave a weakness in the ridge but the GFS is apt
to build the ridge over the northern Gulf. The ECMWF and CMC are
more willing to hold onto the weakness with troughing over the
Great Lakes into New England. The ECMWF and CMC both bring a cold
front to the northern Gulf on Thursday with the GFS having the
front stall along I-20. With there being some uncertainty with the
frontal push, the forecast will go with 20 PoPs to split the
difference until models come into better agreement.

Overpeck

MARINE...
With surface high pressure continuing to build in over NW Gulf of
Mexico, southerly winds between 10-15 kts can be expected through
the rest of tonight lowering to 5-10 kts during the day Friday. This
pattern of slightly higher wind speeds during the overnight hours
and weaker winds during the daytime hours will continue through the
weekend. Wave heights should also stay between 2-3 feet, eventually
lowering to 1-2 feet early next week. The chance for precip will
also be on the rise beginning Monday as a weak disturbance
propagates across SE TX.

Tides also appear to be running near normal to slightly above
normal, by a half foot at certain locations. Expecting the tide
levels to remain fairly consistent through the weekend with the area
of high pressure in control and little variation in wind speed and
direction.

Hathaway

TROPICS...
It`s the last half of August so getting closer to that
climatological peak of hurricane season on September 10. There is
TS Harvey over Barbados with two more tropical waves in the main
development region of the Atlantic. At this point, TS Harvey will
be the one to watch next week. Consensus of the tropical models
takes Harvey towards Belize next Wednesday. There are still lots
of question marks as to what happens after that with a wide
disparity in the model solutions between the GFS, ECMWF and
Canadian. Again, something to keep track of during the weekend and
early next week.

Overpeck

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL) 100 78 100 77 99 / 10 10 10 10 10
Houston (IAH) 98 79 97 78 96 / 10 10 10 10 20
Galveston (GLS) 91 83 90 83 90 / 10 10 10 10 20

&&

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

$$

Discussion...39
Aviation/Marine...08
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