Thursday, September23, 2021
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Marine Weather and Tides
Indianapolis, IN

Version 3.4
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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 7:32AMSunset 7:41PM Thursday September 23, 2021 2:57 PM EDT (18:57 UTC) Moonrise 8:13PMMoonset 9:02AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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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7 Day Forecast for Marine Location Near Indianapolis , IN
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Area Discussion for - Indianapolis, IN
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FXUS63 KIND 231803 AFDIND

Area Forecast Discussion National Weather Service Indianapolis IN 203 PM EDT Thu Sep 23 2021

. Updated Aviation Discussion .

Forecast Update. Issued at 1027 AM EDT Thu Sep 23 2021

The broad area of cyclonic rotation in association with yesterday's low pressure system is now just northeast of central Indiana. Current GOES16 IR shows the surface low centered over northern Ohio. So, any lingering rain showers this morning have been confined to the northeast counties, and those will also taper off over the next few hours. Elsewhere, partly cloudy skies are prevailing as drier air filters into central Indiana. Current temperatures across the area are generally in the 50s. Updated grids have been sent.

Short Term. (Today through Friday) Issued at 303 AM EDT Thu Sep 23 2021

The short term will feature a transition from unseasonably cool conditions today into seasonable autumn weather to end the work week, all the while the region dries out from the recent soaking rains. The stacked low that focused moderate to heavy rains over much of the region Wednesday has since slid northward, situated over northwestern Ohio very early this morning. Latest guidance is showing decent agreement on the cut-off's next moves, continuing northward to eastern Ontario by Friday morning. However, embedded vorts, swinging from northwest to southeast today . will maintain considerable cloudiness and chances of light to perhaps briefly moderate showers across north-central and northeastern counties. Best chances for rain will be the morning and midday hours, with any additional rainfall generally under 0.10". Locations southwest of the I-74 corridor should, simultaneously, remain dry under partly to mostly sunny skies. It will be another brisk day under the cut- off's lingering gradient, but generally free of the 25+ mph gusts that impacted much of the CWA yesterday.

At least moderate confidence exists that the threat of any remnant showers will finally leave the northeastern counties by 00z this evening as the vorts spin out of the region. Tonight will then have the lowest readings for most locations since late May as diminishing gusts and mainly clear skies allow for ample radiational cooling. Winds will back to west-southwesterly in the evening . as the departure of the cut-off's southern periphery allows rather weak but broad surface high pressure to build in from the south.

Most of Friday will be a classic early autumn day . as the next approaching wave/front enters the Upper Mississippi River Valley, tightening the low-level gradient over Indiana . with the resulting moderate southwesterly breezes and abundant sunshine combining to rebound temperatures by at least 25-30 degrees by the afternoon. A few high clouds reaching the northwestern zones by late day will mark the approach of the next system.

Temperatures around 50F early today will slowly rise today . with afternoon highs ranging from the upper 50s in far northeastern counties to the upper 60s along the lower Wabash Valley. Lows tonight will be in the mid to upper 40s . before quickly rising into the low to mid 70s Friday.

Long Term. (Friday night through Wednesday) Issued at 303 AM EDT Thu Sep 23 2021

Fri Ngt-Sat: After a stretch of dry weather, which is welcome given the abundant rainfall from earlier in the week, robust trough axis arrives across the Central CONUS and steadily pivots east through the Great Lakes/Ohio Valley early Sat. Mid-lvl shortwave appears to be rather robust with considerable vorticity; however, the meat of the energy will be displaced to the northwest of Indiana with the surface vort- max quickly lifting north through Lower Michigan. This will likely stretch out a surface boundary south/southwest, that does have some moistening in the profile late Fri into early Sat. The challenge could be the departing anti-cyclonic feature has some lingering influence, while diffluent flow from an approaching ridge behind the boundary pushes in from northwest flow. With this being said, POP chances are not going to be overly high, but if any jog south of the best dynamics/forcing should occur than this will help elevate POPs.

With the somewhat progressive look to the longwave pattern with the trough axis, expect some lingering clouds thru Sat. But could be more diurnally driven until ridging arrives overhead later Sat and scours any lingering cloud cover. This will create optimal radiational cooling conditions heading into late Sat. Couple this with a thermal trough aloft, and temps should easily push into the upper 40s to around 50.

Sun-Mon: Eluded to in the prior section, there is a somewhat fluid flow to the longwave pattern, and ensembles continue to be supportive of this as minimal spread remains indicating a high confidence in the surface ridge exiting stage left or in our case east, turning flow from the southwest and ushering in a steady warming trend. 500mb wave remains quasi-oriented to the northwest; however, expectations are that this will begin to transition to a more westerly and slightly southwesterly orientation as next week progresses. Looking upstream, PAC-NW vort digs marginally along the Oregon coast, helping to amplify the downstream ridge over the Rockies and will eventually build the ridge over the Ohio Valley.

With flow steadily turning to the southwest, expect temps to flirt with being above normal yet again with highs pushing into the upper 70s to lower 80s and possibly middle 80s by Mon. Expect some larger diurnal swing to the temps, as overnight lows fall into the low/mid 50s.

Tue-Thur: PAC-NW 500mb trough begins to push east and inland, which will help slide the downstream ridge east across the Central CONUS with some amplification to the ridge and elevating heights aloft. This will allow surface conditions to warm slightly more with afternoon highs back into the lower/middle 80s. Low-level moisture will begin to creep back as the surface ridge drifts east and becomes centered across the Carolina coast. This will allow western GOMEX air to meander north and reach the Ohio Valley towards the middle to later half of next week. This added moisture will help hold overnight temps up in the lower 60s. Otherwise, the only precip in the current extended periods will be late Fri/early Sat.

Aviation. (18Z TAF Issuance) Issued at 203 PM EDT Thu Sep 23 2021

IMPACTS:

- VFR conditions throughout the forecast period - Periodic W/NW wind gusts up to 22 kts through this afternoon

DISCUSSION: Dry air continues to filter into central Indiana behind yesterday's system. So, conditions have returned to VFR levels at all TAF sites and are expected to stay there for the duration of the TAF period as high pressure strengthens over the Midwest. Meanwhile, winds will be out of the west/northwest at 10 to 12 kts with gusts up to 22 kts through this afternoon before tapering off this evening.

IND WATCHES/WARNINGS/ADVISORIES. None.



Update . TDUD Short Term . AM Long Term . Beach Aviation . TDUD


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Indianapolis International Airport, IN7 mi64 minNW 1010.00 miMostly Cloudy60°F48°F65%1015.2 hPa
Indianapolis, Eagle Creek Airpark, IN8 mi65 minWNW 10 G 1610.00 miPartly Cloudy64°F49°F58%1014.8 hPa
INDIANAPOLIS, IN18 mi63 minW 610.00 miOvercast59°F49°F69%1015.6 hPa
Shelbyville Municipal Airport, IN23 mi65 minNNW 710.00 miMostly Cloudy62°F50°F65%1014.7 hPa

Link to 5 minute data for KIND

Wind History from IND (wind in knots)
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Last 24hrNW23
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N10NW8NW7W8W11W14W12W12W12W11W10W8W11W10W13NW14NW14
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1 day agoNW14NW6W5NW7NW6NW6NW14
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2 days agoSE12S10
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