Monday, September20, 2021
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Marine Weather and Tides
Hammond, IN

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:33AMSunset 6:53PM Sunday September 19, 2021 11:21 PM CDT (04:21 UTC) Moonrise 6:45PMMoonset 4:50AM Illumination 98% Phase: Waxing Gibbous; Moon at 13 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- 950 Pm Cdt Sun Sep 19 2021
.small craft advisory in effect from Monday morning through Tuesday morning...
Rest of tonight..South winds 10 to 15 kt increasing to 15 to 20 kt after midnight. Chance of showers and slight chance of Thunderstorms after midnight. Waves 2 ft or less.
Monday..South winds to 30 kt. Showers likely and slight chance of Thunderstorms. Waves 1 to 3 ft.
Monday night..South winds to 30 kt. Slight chance of showers in the evening. Slight chance of Thunderstorms through the night. Showers after midnight. Waves 2 to 4 ft.
Tuesday..West winds 15 to 25 kt becoming northwest 15 to 20 kt in the afternoon. Rain showers likely and a chance of Thunderstorms. Waves 2 to 4 ft building to 3 to 5 ft in the afternoon.
LMZ743 Expires:202109200930;;884426 FZUS53 KLOT 200250 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 950 PM CDT Sun Sep 19 2021 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>745-200930-


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 192349 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 649 PM CDT Sun Sep 19 2021

SHORT TERM. 340 PM CDT

Through Tuesday evening .

Active weather will move in during this period as the forecasted upper wave moves through tonight, followed by surface cold front early Tuesday morning. Southerly flow continues to pump warm, moist air into our region, allowing temperatures to bump up to the upper 80s / lower 90s. The wave has moved into southern Illinois, a bit faster than originally thought, with showers and thunderstorms moving up from the south. The wave is expected to enter my southern forecast area (Ford, Iroquois, Benton counties) as early as 9 to 10 PM this evening, but the main wave and precipitation will be just after midnight. With precipitable water values of 1.5 to 2" associated with this wave, some of these showers and storms are expected to produce heavy rainfall. The wave will move northeast of us by early Monday afternoon, taking the majority of the precipitation with it, although some lingering isolated showers may pop up in the afternoon. High temperatures will be slightly lower than today due to precipitation and cloud cover, with highs in the upper 70s / lower 80s. In addition to showers and storms, expect some gusty winds Monday afternoon, with gusts of 25 to 30 mph possible. These gusty winds are expected to continue into Monday night, with even higher gusts possible.

The slight break in rain Monday afternoon and early evening will quickly be replaced by rain showers and thunderstorms associated with a cold front moving in from the west. Western locations could see showers and thunderstorms in the early evening, moving into Chicago shortly before midnight. Instability associated with this front is a bit greater than the wave, so I expect a better chance for thunderstorm development, especially along the leading edge of the front. Winds will shift from the northwest with the front, and noticeably cooler temperatures will move in shortly behind the wind shift. These northwesterly winds will be gusty, but not nearly as strong as the winds ahead of the front, with gusts of around 20 mph expected. The showers and storms should move east of northwest Indiana in the early afternoon, with a slight chance of isolated showers lingering into the early evening. Cooler temperatures behind the front will keep Tuesday's high's in the lower 70s. Cloud cover will begin to decrease in western counties by early evening Tuesday, but will linger a bit longer for the rest of the region.

BKL

LONG TERM. 205 PM CDT

Tuesday night through Sunday .

Markedly cooler air will arrive into the region on Tuesday night with overnight temperatures away from the modifying influence of the lake expected to drop into the upper 40s to around 50 degrees. The combination of strengthening cold advection and an associated steepening of low-level (0-2 km) lapse rates will promote strengthening northerly winds. These will be strongest near the immediate lakeshore where near-surface instability will be highest (+5 C 850 temperatures overtop a lake with water temperatures still in the upper 60s/lower 70s) supporting gusts towards 30 to 40 mph as we head into Wednesday. This magnitude of northerly winds will result in building waves, especially into our northwest Illinois nearshore waters. The lower lake levels will help curtail a lakeshore flood threat, but latest guidance does suggest 9-11' waves are possible by Wednesday, something we'll be keeping an eye on, especially if winds increase more substantially.

Global guidance continues to differ regarding the degree of phasing that occurs into Wednesday and Thursday with the latest deterministic GFS just a bit slower/more progressive with the incoming mid-level vort max than the ECMWF. Big variability is still noted across the ensemble envelope, however, and envision we'll continue to see decently sized swings in the guidance here over the next several runs. For now, the blended guidance tosses some low-grade PoPs back west across the forecast area on Thursday, and this seems reasonable given the model solutions at this point even though a totally dry forecast is also in the cards.

Inversion heights lower with time through Wednesday/Wednesday night, resulting in somewhat more marginal lake effect parameters, but lake-induced CAPEs perfect-progging the GFS suggest lake effect showers are possible Wednesday afternoon and through Thursday. As gradient winds slacken by Thursday night, temperatures should be allowed to more uniformly settle into the 40s across the forecast area, except perhaps near Chicago and the immediate lakeshore.

A fast-moving mid-level wave is slated to push across the region towards the end of the week/Saturday timeframe and looks to be accompanied by pretty cool temperatures aloft and associated steep lapse rates. This could bring a quick-hitting round of showers and gusty winds the region again, although confidence in measurable precipitation is still on the lower side, suggesting the blended slight chance PoPs are reasonable.

Carlaw

AVIATION. For the 00Z TAFs .

649 PM . Primary forecast concerns include .

Ifr cigs/vis Monday morning. Showers Monday morning. Gusty southerly winds Monday and Monday evening.

A lake breeze has shifted winds east/southeast for the Chicago terminals. Winds will slowly turn southerly by late this evening and then likely settle on a south/southeast direction by daybreak through mid/late Monday morning. Southerly winds will increase through early/mid afternoon with gusts into the lower/mid 20kt range possible. Gusts may continue to increase as low level winds increase into Monday evening and the low levels remain mixed enough for these higher winds to gust to the surface. By late afternoon, wind directions look to favor south/southwest. Overall, only medium confidence for wind speeds/gusts and directions.

Scattered showers currently over southern IL and southern IN will continue lifting north/northwest and across the terminals in the predawn hours. Some of these rain showers may be briefly heavy, reducing visibilities into the 2sm range. As the low levels saturate, ifr cigs will also be possible and included ifr cigs with the current tempo. There is expected to be an overall decrease in showers by late morning and current vicinity mention has this trend handled well. Cigs are expected to slowly lift through mvfr by early afternoon and likely to low vfr by mid/late afternoon. There may be isolated showers and possibly a thunderstorm in the mid/late afternoon but confidence is too low to include any thunder mention with this forecast. A cold front will move across the area later Monday night, after the end of the current tafs, and this appears to be the best time for thunder, especially at rfd. cms

LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . Small Craft Advisory . LMZ743-LMZ744-LMZ745 . 10 AM Monday to 7 AM Tuesday.

Small Craft Advisory . LMZ740-LMZ741-LMZ742 . 9 PM Monday to 7 AM Tuesday.



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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CMTI2 - 9087044 - Calumet, IL 8 mi51 min S 5.1 G 8 1015.9 hPa
JAKI2 12 mi81 min SSW 5.1 G 8 79°F
CNII2 17 mi21 min S 6 G 8 79°F 61°F
BHRI3 - Burns Harbor, IN 18 mi41 min S 5.1 G 7 79°F 1016.9 hPa
45198 19 mi31 min SSE 5.8 G 7.8 75°F 71°F1 ft69°F
CHII2 - Chicago, IL 21 mi31 min S 14 G 15 78°F 67°F
OKSI2 21 mi81 min N 1 G 2.9 82°F
45170 29 mi21 min SSE 7.8 G 9.7 76°F 1 ft68°F
MCYI3 - Michigan City, IN 32 mi31 min SSE 8 G 9.9 79°F 1015.9 hPa62°F
45174 37 mi21 min SSE 7.8 G 9.7 71°F1 ft1014.7 hPa

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Gary Regional Airport, IN4 mi26 minN 010.00 miFair72°F64°F78%1016.9 hPa
Lansing Municipal Airport, IL7 mi26 minS 310.00 miFair73°F62°F69%1016.6 hPa
Chicago, Chicago Midway Airport, IL18 mi28 minS 510.00 miMostly Cloudy80°F61°F52%1014.9 hPa

Link to 5 minute data for KGYY

Wind History from GYY (wind in knots)
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Last 24hrNE5CalmCalmSE3CalmSE5SE6SE6SE6S5CalmCalmCalmNE8NE8NE8NE10E6E6CalmCalmCalm--SE3
1 day agoNW4N10N10
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N8N9N8N7NE6NE9NE9NE9N7N7N10N10N10N8N8N8N4N6N5NE5N4
2 days agoSE5S3SE3SE4S3SE5SE3SE4S3S6W5W12W12W6SW6W6SW5SW5SW6CalmCalmCalmCalmCalm

Tide / Current Tables for
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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