Sunday, August25, 2019 L-36.com


Marine Weather and Tides
Hammond, IN

Version 3.4
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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 6:07AMSunset 7:36PM Sunday August 25, 2019 10:18 AM CDT (15:18 UTC) Moonrise 12:41AMMoonset 3:57PM Illumination 24% Phase: Waning Crescent; Moon at 25 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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LMZ743 Calumet Harbor To Gary-gary To Burns Harbor- Burns Harbor To Michigan City- 938 Am Cdt Sun Aug 25 2019
Rest of today..Southeast winds around 15 kt. A chance of sprinkles. Waves 1 to 3 ft.
Tonight..Southeast winds 15 to 20 kt. Chance of showers. Waves 1 to 3 ft.
Monday..Southeast winds 15 to 20 kt. Chance of showers and slight chance of Thunderstorms. Waves 1 to 3 ft.
Monday night..South winds 10 to 20 kt becoming southwest after midnight. Showers likely and slight chance of Thunderstorms. Waves 1 to 3 ft.
LMZ743 Expires:201908252115;;188083 FZUS53 KLOT 251438 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 938 AM CDT Sun Aug 25 2019 For waters within five nautical miles of shore on Lake Michigan Waves are provided as a range of significant wave heights, which is the average of the highest 1/3 of the waves, along with the average height of the highest 10 percent of the waves which will occasionally be encountered. LMZ743>745-252115-


7 Day Forecast for Marine Location Near Hammond, IN
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location: 41.62, -87.49     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 251053
afdlot
area forecast discussion
national weather service chicago romeoville, il
553 am cdt Sun aug 25 2019

Short term
158 am cdt
through tonight...

a still mainly quiet weather pattern continues into today, though
a cloudier one and a sign of gradually increasing ascent and
moisture. With this some spotty sprinkles are possible this
afternoon into early evening before scattered showers are likely
late this evening into the overnight.

Upper and surface ridging are slowly moving east from the region
this morning. The upper ridging has been stout with 500 mb
heights of 589 dam last evening over the area. This has served as
blocking to the west, however a stronger jet of 110+ kt surging
across the northwest u.S. This morning will being to impinge into
and weaken this ridge as it shifts east. Clouds will gradually
thicken today in response and a subtle disturbance near st. Louis
this morning will slowly meander north-northeast toward the area.

Last evening's soundings showed substantial dry air above 850 mb
which will take time to saturate, and thus believe through early
evening it will be difficult to get more than spotty sprinkles.

The clouds and continued easterly winds will prevent temperatures
from moderating much from yesterday, with a 2-3 degree increase
expected. On the note of easterly winds, these once again will be
providing onshore flow into northeast illinois and lake michigan
beach conditions will be close to a high rip current risk. At
this time expecting more of a moderate risk, but for locations
north of chicago it will be close with 3-4 ft waves forecast.

The upper pattern begins to show a little more cohesiveness
tonight with a potential vorticity perturbation developing over
or just west of the region and low-level flow turning more
southerly steering in higher precipitable water air. Moistening on
the isentropic surfaces with the stronger lift still looks
marginal, likely resulting in only scattered showers. The eastern
half of the forecast area may be a little more favored with the
aforementioned wave over st. Louis this morning slowly lifting
north-northeast serving as one focus, with the greater synoptic
forcing still west. Elevated lapse rates are weak because of this
so the thunder threat looks limited though cannot rule out an
isolated non-severe storm or two overnight south and west.

Mtf

Long term
434 am cdt
Monday through Saturday...

the long term forecast period will start out active with periods of
showers and thunderstorms lingering into Tuesday morning. Much of
the remainder of the period should be dry, though there may be
another chance for precipitation for Friday and into next weekend.

Showers and thunderstorms should be ongoing across eastern il and
northern in Monday morning in response to a southern stream
shortwave lifting from the lower missouri valley and across central
in and northern in. Showers and thunderstorms will be mostly south
of i-80 in il but all of nwrn in will like see some activity.

However, some scattered showers and thunderstorms cannot be ruled
out for NRN il. As this initial wave continues to lift newd, weak
shortwave ridging and mid-level drying may bring a lull in the pcpn
for Monday afternoon, though some sct showers may be possible.

A strong northern stream shortwave will drop into the well upper
midwest by early Monday evening with an associated cold front moving
from ERN ia into nwrn il. In advance of the system, deep layer
moisture will continue to increase, with pwats just under 2 inches
pooling ahead of the sfc cold front. Steep mid-level lapse rates, a
40 kt low-level jet combined with the high moisture level and
moderate instability will bring both chances for severe
thunderstorms and localized flooding. Strong winds will be the
primary severe threat. Flooding potential should be limited due to
the relatively dry conditions over the past few weeks, giving area
rivers ample storage capacity. However, some of the latest guidance
is suggesting that the progression of the cold front across the
region may be slower than previously anticipated, so any heavy rain
producing storms may have a longer residence time over a given area,
increasing the flooding potential. The cold front is expected to
push east of the CWA by late Tuesday morning so there could be some
lingering showers over nwrn in through the morning. The entire cwa
should be rain-free by the afternoon.

Dry and pleasant conditions should return to the area for midweek as
a surface high builds across the middle mississippi valley through
the ohio valley. High temperatures will be around 80 f for Monday
and Tuesday. As the upper level pattern trends toward more high
amplitude long wavelength, with upper riding over the west coast and
broad upper troughing over the ERN 2 3 conus, the resultant nwly
flow general troughiness aloft will keep temperatures below seasonal
normals, with highs in the middle to upper 70s for much of the
remainder of the period, though highs could reach 80 f on Thursday
as weak shortwave riding moves across the area in between a series
of weak shortwaves rotating around the base of the main upper low
over scntrl sern canada. The next chance for precipitation may come
by the end of the week into next weekend with some of the long range
guidance suggesting the next frontal passage. However, this
guidance is also trending the upper level flow pattern to move zonal
across much of the nrn CONUS by the end of the week, so timing of
any shortwaves and associated features are low confidence at this
time range.

Aviation
For the 12z tafs...

concerns for the chicago area tafs through Monday morning are:
- easterly winds increasing to just above 10 kt late this morning
with occasional gusts
- chance for showers late tonight into early Monday morning, with
a small chance for isolated thunderstorms
- MVFR clouds likely Monday morning with a chance for ifr
high pressure across the eastern great lakes will continue to
gradually move away from the area today resulting in increasing
easterly winds. Otherwise for today and early this evening, dry
air aloft is likely to prevent showers from reaching the tafs
during that time though patchyVFR sprinkles may occur. For late
this evening into Monday morning, both lift and saturation will
gradually improve and scattered showers are favored. Parameters
for thunderstorms in the local area look limited through Monday
morning, but cannot rule it out with isolated coverage if any can
develop.

The moistening conditions look supportive of MVFR ceilings and
likely some ifr to expand northeast from western illinois during
early Monday morning. How far this progresses into the area,
especially ifr, is a detail that will have to be analyzed further
in time. But the potential for ifr is there, especially in the
few hours immediately after any early a.M. Showers.

Mtf

Lot watches warnings advisories
Il... None.

In... None.

Lm... None.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CMTI2 - 9087044 - Calumet, IL 8 mi48 min ESE 6 G 8.9 69°F 1019.8 hPa55°F
JAKI2 12 mi138 min Calm G 2.9 70°F
CNII2 17 mi33 min ESE 9.9 G 11 72°F 57°F
BHRI3 - Burns Harbor, IN 18 mi38 min ESE 6 G 8 70°F 1021.3 hPa
45177 20 mi138 min 73°F1 ft
CHII2 - Chicago, IL 21 mi28 min ESE 16 G 18 69°F 60°F
OKSI2 21 mi138 min SSE 4.1 G 7 71°F
FSTI2 26 mi138 min SE 16 67°F
45170 29 mi28 min ESE 9.7 G 9.7 66°F 65°F1 ft57°F
MCYI3 - Michigan City, IN 32 mi28 min E 6 G 8.9 68°F 54°F
45174 37 mi28 min ESE 12 G 16 72°F3 ft1019.4 hPa

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Gary Regional Airport, IN4 mi33 minSE 810.00 miMostly Cloudy70°F51°F53%1020.7 hPa
Lansing Municipal Airport, IL7 mi43 minSE 610.00 miFair68°F55°F63%1021 hPa
Chicago, Chicago Midway Airport, IL18 mi85 minSE 910.00 miMostly Cloudy68°F54°F61%1020.1 hPa

Link to 5 minute data for KGYY

Wind History from GYY (wind in knots)
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Last 24hrSE11E12NE12E12E9E10E9E10E12E8E6----E4----------E6--SE7SE6SE8
1 day agoNE12NE11NE12NE10
G20
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NE8NE6----NE7--E4E6E4SE6SE7SE8SE10SE12E16
2 days agoE8E6E11E9E10NE14
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NE12NE10
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------E11
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E9E8E7E6E8E7E6E6NE8

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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GOES Local Image of    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.
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Wind Forecast for Chicago, IL (11,2,3,4)
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Ground Weather Radar Station Chicago, IL
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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.