Wednesday, August23, 2017 L-36.com


Marine Weather and Tides
Treasure Island, FL

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:04AMSunset 8:02PM Wednesday August 23, 2017 4:22 AM EDT (08:22 UTC) Moonrise 7:52AMMoonset 8:32PM Illumination 1% Phase: Waxing Crescent; Moon at 1 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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GMZ830 Tampa Bay Waters- 414 Am Edt Wed Aug 23 2017
Today..Northeast winds around 5 knots. Bay and inland waters smooth. Scattered Thunderstorms in the afternoon.
Tonight..East winds around 5 knots. Bay and inland waters smooth. Scattered Thunderstorms in the evening, then isolated Thunderstorms after midnight.
Thursday..Southeast winds around 5 knots then becoming northeast late in the afternoon. Bay and inland waters smooth. Isolated Thunderstorms in the morning, then scattered Thunderstorms in the afternoon.
Thursday night..East winds around 5 knots then becoming southeast after midnight. Bay and inland waters smooth. Scattered Thunderstorms.
Friday..East winds around 5 knots then becoming northwest around 10 knots in the afternoon. Bay and inland waters a light chop. Scattered Thunderstorms in the morning, then numerous Thunderstorms in the afternoon.
Friday night..North winds around 5 knots. Bay and inland waters smooth. Numerous Thunderstorms in the evening, then scattered Thunderstorms after midnight.
Saturday..North winds around 5 knots. Bay and inland waters smooth. Numerous Thunderstorms.
Saturday night..Northeast winds around 10 knots. Bay and inland waters a light chop. Numerous Thunderstorms in the evening, then scattered Thunderstorms after midnight.
Sunday..North winds around 10 knots. Bay and inland waters a light chop. Scattered Thunderstorms.
GMZ800 Synopsis For The Coastal Waters From Bonita Beach To Suwannee River- 414 Am Edt Wed Aug 23 2017
Synopsis..Subtropical ridge axis north of the waters will pull back over the atlantic during the next couple of days as a tropical wave moves across south florida then lifts northward. During the weekend the tropical wave deepens as it slides northward along the southeast u.s. Coast while high pressure builds into the eastern gulf of mexico from the north. Expect increasing Thunderstorms into the weekend with dangerous lightning and locally higher winds and seas.

7 Day Forecast for Marine Location Near Treasure Island city, FL
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location: 27.77, -82.78     debug


Area Discussion for - Tampa Bay, FL
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Fxus62 ktbw 230513
afdtbw
area forecast discussion
national weather service tampa bay ruskin fl
113 am edt Wed aug 23 2017

Aviation
23 06z tafs. PrevailingVFR expected through the TAF period...

however vcts with few-sct CB btwn 18z-03z may provide brief
MVFR LCL ifr late in the period. Light and variable easterly
winds rest of tonight pick up some from the E or SE in the
morning and continue. Although tpa pie srq may bay-sea breeze.

Prev discussion issued 521 pm edt Tue aug 22 2017
update...

although some moisture return is evident in WV imagery
aloft over the southern half of the forecast area, the
extent of influx has been minimal. In addition... It is quite
evident via satellite trends (and looking out the
window)... The we are still dealing with efficient
suppression in the atmosphere... Keeping the CU fields
generally shallow. Another big factor we are seeing as of
5pm is the we still have fairly healthy offshore flow along
the suncoast... Making the likelihood of defined sea-breeze
formation increasingly less likely within the next hour or
two. With all this in mind... Have made a fairly large
decrease in the overall rain chances for our far southern
zones from highlands to charlotte lee counties. Further
north than that, not needing much in the way of change as
chances were already slight chance isolated at best up to
the i-4 corridor... And less than 10% further north.

Will not remove pops altogether this evening for the
southern zones, as still anticipate a few widely scattered
cells to get established between 22z and 00z... Mainly south
of a line from sarasota to sebring... With better chances
the further south. However, at this point... All the factors
above make it difficult to expect more than about a 30%
chance at any one location. Will remove all pops over the
landmass after 02z... With a dry rest of the overnight
region-wide.

The moisture will continue a slow recovery aloft during the
day Wednesday... And be back above normal for all areas by
Thursday. The combination of this increase in available
moisture, and the arrival of a weak surface trough from the
east (and resulting enhanced surface focus)... The chances
for diurnal showers and storms will slowly ramp up through
the middle of the week.

Prev discussion... Issued 303 pm edt Tue aug 22 2017
short term (tonight-Wednesday)...

a tropical wave just to the east of the southeast fl coast
will gradually shift west over south fl and weaken across
the area through Wednesday. Deep moisture will move into the
area and allow for scattered to numerous showers and
thunderstorms, with the highest chances Wednesday afternoon
and across the south. Generally east to NE winds will be in
place through the period, becoming light overnight, and a
weak sea breeze Wednesday afternoon turning winds onshore.

Lows tonight will be in the lower to mid 70s north and
inland, and in the upper 70s to lower 80s along the coast.

Highs Wednesday in the lower to mid 90s.

Long term (Wednesday night through next Tuesday)...

at the beginning of the long range period, a potent upper
trough will extend from the northern plains into new
england. High pressure will dominate the remainder of the
country with a couple of noted weaknesses in the tropics. At
the surface, high pressure will extend across the western
atlantic ocean and the gulf of mexico with a weak tropical
low near the southern tip of florida, and a strengthening
low pressure system over the western gulf of mexico.

We again face an uncertain forecast as models continue to
handle the evolution of a weak surface low quite poorly.

This tropical disturbance is currently situated over the
bahamas and will drift slowly west to northwest to a
position either over the southern florida peninsula or just
offshore in the far eastern gulf by late Wednesday. As is
common with weak areas of low pressure, medium range
guidance can hardly resolve the system, which is making the
exact track of the feature very difficult to discern. The
more reliable mid long range solutions are beginning to
converge somewhat, but we have a long way to go before
consensus is obtained. To complicate things, the remnants of
harvey look to move out into the western gulf, eventually
strengthening into at least a tropical depression or
tropical storm. Both of these features, along with a
deepening of the upper trough and a southward moving cold
front will lead to a complicated forecast and error is
certain to be quite high as we move beyond this weekend.

What we do know is that the weak tropical disturbance is
likely to at least affect areas of southern and perhaps
central florida Wednesday into the weekend, as a plume of
deep tropical moisture joins the daily seabreeze
circulations and daytime heating. This should promote fairly
widespread showers and thunderstorms Thursday through
Saturday afternoon, especially south of the i-4 corridor.

Localized flooding may occur in areas that receive training
rounds of heavy rain, though widespread flooding doesn't
appear likely at this time. Further north, over north
central florida and along the nature coast, lesser chances
of rain will exist due in part to the presence of some
slightly drier air aloft.

Beyond the weekend, even greater uncertainty exists as
models attempt to spin up two tropical cyclones along the
stalled frontal boundary. Right now, we look to remain
between these two systems, which would generally favor drier
and hotter conditions that normal, but a small deviation
could result in greater impacts to the area, and will will
have to monitor the situation closely.

Marine...

weak pressures will be in place across the waters with weak
ridging in place and a tropical wave along the SE fl coast.

Increasing moisture will allow for scattered to numerous
showers and thunderstorms through the weekend as generally
easterly flow continues, turning onshore along the coast
each afternoon. No headlines currently expected through the
period.

Fire weather...

no concerns.

Preliminary point temps pops
Tpa 94 79 91 78 40 30 60 30
fmy 92 76 89 77 70 40 80 40
gif 94 76 92 75 50 20 70 30
srq 94 78 90 78 40 30 60 40
bkv 95 75 93 75 30 20 60 30
spg 94 79 90 79 30 30 60 30

Tbw watches warnings advisories
Fl... None.

Gulf waters... None.

Aviation... Rude
update... Mroczka
previous discussion... Hubbard austin


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CLBF1 5 mi88 min E 1.9 G 4.1 82°F 1014 hPa
SAPF1 - 8726520 - St. Petersburg, FL 8 mi52 min E 5.1 G 7 82°F 88°F1014.6 hPa
MTBF1 12 mi52 min E 7 G 8.9 81°F 1014.5 hPa
OPTF1 - 8726607 - Old Port Tampa, FL 13 mi52 min ESE 1.9 G 2.9 80°F 88°F1014.4 hPa
PMAF1 15 mi52 min 78°F 88°F1013.6 hPa
CWBF1 - 8726724 - Clearwater Beach, FL 15 mi52 min ESE 6 G 8 82°F 88°F1014.4 hPa
42098 15 mi52 min 89°F2 ft
MCYF1 21 mi52 min 89°F
TSHF1 - 8726667 - East Bay Causeway, FL 22 mi58 min E 1.9 G 2.9
TPAF1 - 8726694 - TPA Cruise Terminal 2, Tampa, FL 22 mi64 min ENE 4.1 G 5.1
FHPF1 - Fred Howard Park, FL 26 mi88 min SE 5.1 G 6 81°F 1015.4 hPa
42013 - C10 - Navy-2 42 mi52 min ESE 9.7 G 14 88°F
ARPF1 - APK - Aripeka, FL 46 mi88 min ESE 4.1 G 5.1 77°F 1015 hPa

Wind History for St. Petersburg, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Albert Whitted Airport, FL8 mi29 minESE 710.00 miFair82°F77°F85%1013.4 hPa
St. Petersburg/Clearwater Airport, FL11 mi29 minN 010.00 miFair80°F75°F87%1013.9 hPa
Macdill Air Force Base, Fl., FL15 mi84 minESE 310.00 miFair79°F78°F100%1015.2 hPa
Tampa, Tampa International Airport, FL19 mi29 minNE 310.00 miFair81°F75°F82%1014.2 hPa
Tampa, Peter O Knight Airport, FL20 mi47 minN 010.00 miMostly Cloudy81°F80°F100%1014.6 hPa

Wind History from SPG (wind in knots)
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Last 24hrE13E12E12E13SE12E8E8E6E5NE5NE5NE3NE4E7N6N4E13E15SE16SE15SE12SE10SE8SE7
1 day agoSE8SE9E11E10E12E9SE9SE8SE8SE6E3SE7E5E7SE9SE13E11SE11SE12SE15SE15SE12E12E13
2 days agoSE10S7SE6SE4SE5SE6SE5E4E5E4E10SE9SE11E10SE15SE17SE16SE13SE9S10S10SE8SE11SE13

Tide / Current Tables for Johns Pass, Florida
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Johns Pass
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Wed -- 01:59 AM EDT     1.77 feet High Tide
Wed -- 07:05 AM EDT     Sunrise
Wed -- 07:21 AM EDT     0.96 feet Low Tide
Wed -- 08:52 AM EDT     Moonrise
Wed -- 01:22 PM EDT     2.44 feet High Tide
Wed -- 08:01 PM EDT     Sunset
Wed -- 08:24 PM EDT     0.42 feet Low Tide
Wed -- 09:32 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.71.81.71.51.31.1111.21.61.92.32.42.42.21.91.510.60.40.50.71

Tide / Current Tables for Tampa Bay Entrance (Egmont Channel), Florida Current
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Tampa Bay Entrance (Egmont Channel)
Click for Map
Wed -- 01:28 AM EDT     1.58 knots Max Flood
Wed -- 04:40 AM EDT     -0.00 knots Slack
Wed -- 07:05 AM EDT     -0.87 knots Max Ebb
Wed -- 07:05 AM EDT     Sunrise
Wed -- 08:52 AM EDT     Moonrise
Wed -- 09:39 AM EDT     0.00 knots Slack
Wed -- 01:07 PM EDT     1.56 knots Max Flood
Wed -- 04:06 PM EDT     -0.00 knots Slack
Wed -- 07:27 PM EDT     -1.79 knots Max Ebb
Wed -- 08:00 PM EDT     Sunset
Wed -- 09:32 PM EDT     Moonset
Wed -- 10:59 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.11.51.51.10.5-0.2-0.7-0.9-0.7-0.40.20.81.31.61.40.90.1-0.7-1.4-1.8-1.7-1.4-0.80

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Southeast    EDIT
Geos

Wind Forecast for Tampa Bay, FL (4,6,7,8)
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Ground Weather Radar Station Tampa Bay Area, FL
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weather_mapweather_map weather_map

Gulf Stream Current


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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.