Friday, September20, 2019 L-36.com


Marine Weather and Tides
Seminole, FL

Version 3.4
NOTICE
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:17AMSunset 7:31PM Friday September 20, 2019 4:10 PM EDT (20:10 UTC) Moonrise 10:49PMMoonset 11:53AM Illumination 58% Phase: Waning Gibbous; Moon at 21 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- 219 Pm Edt Fri Sep 20 2019
.small craft should exercise caution...
Tonight..East winds 15 to 20 knots. Bay and inland waters choppy.
Saturday..East winds 15 to 20 knots. Bay and inland waters a moderate chop.
Saturday night..Northeast winds 15 to 20 knots. Bay and inland waters choppy.
Sunday..East winds around 15 to 20 knots. Bay and inland waters choppy.
Sunday night..East winds around 15 knots. Bay and inland waters a moderate chop.
Monday..Northeast winds around 10 knots. Bay and inland waters a light chop.
Monday night..East winds around 10 knots. Bay and inland waters a light chop.
Tuesday..Northeast winds around 10 knots. Bay and inland waters a light chop.
Tuesday night..Northeast winds around 10 knots then becoming southeast after midnight. Bay and inland waters a light chop.
Wednesday..East winds around 5 knots then becoming north around 10 knots in the afternoon. Bay and inland waters a light chop.
GMZ800 Synopsis For The Coastal Waters From Bonita Beach To Suwannee River- 219 Pm Edt Fri Sep 20 2019
Synopsis..High pressure along the eastern seaboard is producing a tight pressure gradient resulting in gusty east-northeast winds over the gulf waters and hazardous choppy seas are expected through Sunday. Winds will weaken with seas relaxing next week.


7 Day Forecast for Marine Location Near Seminole, FL
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location: 27.86, -82.78     debug


Area Discussion for - Tampa Bay, FL
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Fxus62 ktbw 201749
afdtbw
area forecast discussion
national weather service tampa bay ruskin fl
149 pm edt Fri sep 20 2019

Short term
The subtropical jet axis is flowing clockwise around an upper-level
ridge before diving south over the florida peninsula around an upper-
level trough. This is leading to higher northerly winds aloft. The
jet then turns northward once more over cuba and regions the
polar jet over the north atlantic. A strong ridge is situated
below this feature and extends all the way down to the surface,
with the surface high pressure feature situated in the mid-
atlantic region very close to the chesapeake bay.

A northeasterly wind is beginning to advect small plumes of moisture
back into what is an otherwise fairly dry column of air, but the
vertical extent of this moisture is very limited. From the morning
sounding, the 500mb temperature is around 22f with a dewpoint of
around -64f. While diurnal heating is leading to sufficient
instability near the surface, any strong-ish updrafts are struggling
due to the dry air. Morning showers ran into this issue, and
subsequently had little vertical development and only produced weak
radar returns. This pattern is expected to hold through the weekend
as dry air continues to funnel into the region.

By far, the biggest hazard through the weekend is the marine
conditions. Thanks to a tight pressure gradient from the strong high
pressure feature, winds and seas have been and will continue to be
at advisory criteria through Sunday.

Long term
Hints that the dry season is upon us are beginning to appear.

Weather conditions are expected to remain benign through next week
as high pressure dominates the region. Highs will run around normal,
in the upper 80s near the coast to the low 90s inland. Rain coverage
is expected to be all but nonexistent for everywhere except extreme
portions of southwest florida where an axis of tropical moisture
could support some showers each day. Elsewhere, dry air aloft and
fairly strong subsidence should suppress storm development. A
limited, but higher, chance for rain will return Friday for northern
portions of the peninsula as more moisture returns to this area, but
overall coverage is still expected to be limited.

Aviation
Vfr conditions are expected through the forecast period. Stronger
winds of around 20kts from the ene are possible at all terminals due
to the tight pressure gradient, but otherwise benign conditions are
expected.

Marine
A strong pressue gradient associated with a strong high pressure
gradient is producing strong ene winds in excess of 20kts for
coastal waters. These higher wind speeds are contributing to
higher seas of up to 7 feet in some areas. Subsequently, a small
craft advisory is in effect through Sunday morning.

Conditions will begin to subside as wind speeds decrease Sunday
afternoon. Over the next few days, conditions will gradually return
to normal with winds of 10-12kts and seas running around 1-2ft in
coastal waters.

Fire weather
While drier air is present aloft, conditions are still fairly moist
near the surface. Subsequently, a few showers have developed and are
developing across the region. Values for rh should continue to
remain above critical levels all week even as rain chances decrease
for the next few days. However, dispersion values are running high
today and will continue to do so through Saturday as gusty
conditions associated with a tight pressure gradient from a high
pressure feature over the mid-atlantic persist.

Preliminary point temps pops
Tpa 72 90 71 91 10 0 0 0
fmy 74 89 74 89 10 10 10 30
gif 72 90 71 91 10 0 0 0
srq 73 91 72 91 10 10 0 10
bkv 69 91 69 91 10 0 0 0
spg 73 91 73 91 10 0 0 10

Tbw watches warnings advisories
Fl... None.

Gulf waters... Small craft advisory until 8 am edt Sunday for coastal waters
from bonita beach to englewood fl out 20 nm-coastal waters
from englewood to tarpon springs fl out 20 nm-coastal
waters from tarpon springs to suwannee river fl out 20 nm-
waters from bonita beach to englewood fl out 20 to 60 nm-
waters from englewood to tarpon springs fl out 20 to 60 nm-
waters from tarpon springs to suwannee river fl out 20 to
60 nm.

Short term long term aviation marine fire weather... 97 flannery


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CWBF1 - 8726724 - Clearwater Beach, FL 9 mi65 min ENE 13 G 18 85°F 85°F1018.2 hPa
CLBF1 10 mi77 min ENE 8.9 G 15 85°F 1016.9 hPa
SAPF1 - 8726520 - St. Petersburg, FL 11 mi53 min E 13 G 21 86°F 84°F1018.2 hPa
OPTF1 - 8726607 - Old Port Tampa, FL 12 mi53 min E 9.9 G 18 86°F 84°F1017.8 hPa
GCTF1 15 mi53 min 84°F 1017.8 hPa67°F
MTBF1 17 mi53 min E 20 G 25 83°F 1017.9 hPa65°F
MCYF1 19 mi53 min 85°F
PMAF1 19 mi53 min 85°F 86°F1017.4 hPa
TPAF1 - 8726694 - TPA Cruise Terminal 2, Tampa, FL 19 mi53 min N 12 G 20
TSHF1 - 8726667 - East Bay Causeway, FL 19 mi59 min NNE 13 G 19
42098 20 mi41 min 84°F3 ft
FHPF1 - Fred Howard Park, FL 20 mi77 min ENE 13 G 16 83°F 1019.1 hPa
ARPF1 - APK - Aripeka, FL 40 mi137 min E 13 G 20 92°F 1019.3 hPa
42013 - C10 - Navy-2 48 mi161 min SSW 18 G 21 81°F 85°F1017.8 hPa

Wind History for Clearwater Beach, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St. Petersburg/Clearwater Airport, FL6 mi18 minENE 13 G 2110.00 miMostly Cloudy86°F69°F57%1017.7 hPa
Albert Whitted Airport, FL10 mi18 minE 1710.00 miPartly Cloudy86°F69°F57%1017.2 hPa
Macdill Air Force Base, Fl., FL14 mi75 minE 1410.00 miMostly Cloudy87°F67°F52%1018.2 hPa
Tampa, Tampa International Airport, FL15 mi18 minNE 10 G 1710.00 miA Few Clouds88°F68°F52%1018 hPa
Tampa, Peter O Knight Airport, FL18 mi16 minE 13 G 1810.00 miOvercast88°F69°F55%1017.9 hPa

Link to 5 minute data for KPIE

Wind History from PIE (wind in knots)
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1 day agoNW8NW7E13
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2 days agoNW12NW13NW10NW7N7N5N4N4NE5NE4NE3CalmNE3CalmCalmNE3E7E6E5E5E5NE5NE3NE4

Tide / Current Tables for Indian Rocks Beach (inside), Florida
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Indian Rocks Beach (inside)
Click for Map
Fri -- 04:08 AM EDT     2.72 feet High Tide
Fri -- 07:18 AM EDT     Sunrise
Fri -- 11:14 AM EDT     0.48 feet Low Tide
Fri -- 12:53 PM EDT     Moonset
Fri -- 05:53 PM EDT     2.32 feet High Tide
Fri -- 07:30 PM EDT     Sunset
Fri -- 11:13 PM EDT     1.27 feet Low Tide
Fri -- 11:49 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.72.22.62.72.62.31.91.40.90.60.50.50.81.21.622.22.32.221.71.41.3

Tide / Current Tables for Old Tampa Bay Entrance (Port Tampa), Florida Current
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Old Tampa Bay Entrance (Port Tampa)
Click for Map
Fri -- 01:06 AM EDT     0.00 knots Slack
Fri -- 04:08 AM EDT     0.93 knots Max Flood
Fri -- 06:42 AM EDT     -0.00 knots Slack
Fri -- 07:17 AM EDT     Sunrise
Fri -- 10:18 AM EDT     -1.15 knots Max Ebb
Fri -- 12:52 PM EDT     Moonset
Fri -- 02:58 PM EDT     0.00 knots Slack
Fri -- 06:02 PM EDT     0.73 knots Max Flood
Fri -- 07:29 PM EDT     Sunset
Fri -- 09:44 PM EDT     -0.00 knots Slack
Fri -- 11:42 PM EDT     -0.35 knots Max Ebb
Fri -- 11:48 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-00.40.70.90.80.4-0.2-0.6-1-1.1-1.1-0.9-0.6-0.300.40.60.70.70.50.2-0.1-0.3

Weather Map
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wmap_A
GEOS Local Image of Southeast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Tampa Bay, FL (16,3,4,5)
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Ground Weather Radar Station Tampa Bay Area, FL
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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.