Indiana, PA Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for Indiana, PA

April 22, 2024 12:37 AM EDT (04:37 UTC) Change Location
Sunrise 6:24 AM   Sunset 8:03 PM
Moonrise 6:02 PM   Moonset 4:48 AM 
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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.

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7 Day Forecast for Marine Location Near Indiana, PA
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Area Discussion for - Pittsburgh, PA
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FXUS61 KPBZ 220143 AFDPBZ

Area Forecast Discussion National Weather Service Pittsburgh PA 943 PM EDT Sun Apr 21 2024

SYNOPSIS
Frost/Freeze headlines are in effect early Monday morning for the potential for sub-freezing temperatures. The next chance of precipitation will be Tuesday night into Wednesday with a passing cold front.

NEAR TERM /UNTIL 1 AM MONDAY MORNING/
KEY MESSAGES:

- Below average temperatures and a clear sky continues for the next 3 hours.

- No Hazardous weather.

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9pm Update: No major changes have been made to this forecast period.

Clouds have dissipated late this evening. Radiational cooling will prompt temperatures to take a dive into the mid-30s between now and 1am, enhancing frost formation to start across the region.

Temperatures will continue to trend below average under cold, northwest flow as a trough lifts to our north.

SHORT TERM /1 AM MONDAY MORNING THROUGH MONDAY NIGHT/
KEY MESSAGES:

- Frost/Freeze headlines are in effect across the region between 1am to 9am; sensitive plants will likely experience damage if not protected.
- Below average high temperatures will continue Monday afternoon as cold air lingers across the region.
- Frost/Freeze potential will remain low Monday night into early Tuesday with warm, moist advection.
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A Frost Advisory and Freeze Warning are in effect from 1am to 9am Monday due to lingering cold air from an exiting trough to the north, clearing sky, and light winds. Probability of <=32F is above 80% for areas north of Pittsburgh and within the ridges; hence the Freeze Warning. Elsewhere, a Frost Advisory has been issued for temperatures ranging between 35F to 32F.

Temperatures will recover to near 60F during the day with building high pressure and abundant sunshine, but will still be several degrees below normal.

With warm, moist advection late Monday night, the probability of frost/freeze products being issued is low. Temperatures will actually be near the climatological norm across the region into early Tuesday morning with cloud coverage building.

LONG TERM /TUESDAY THROUGH SUNDAY/
KEY MESSAGES:

- The potential for Frost/Freeze headlines remains low through Wednesday.
- The next low pressure system and associated precipitation chances is likely for late Tuesday into Wednesday.
- Frost/Freeze potential returns Wednesday into Thursday with a passing trough over the Great Lakes.
- There is a potential for strong thunderstorms Sunday into Monday.
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A flux in low-lvl moisture and southwest flow under a ridge will decrease the potential of frost/freeze headlines through at least Wednesday.

Near to above average temperatures are anticipated Tuesday afternoon ahead of an approaching cold front and its associated trough.

Probability of measured precipitation increases from west to east after 18Z Tuesday. Prior to the onset of measurable precipitation, expect gusty conditions with diurnal mixing of linger dry air and 850mb winds ranging from 25kt to 35kts from the southwest.

The axis of heavier rainfall is expected to be in the vicinity of I-80 with the passing cold front, associated with the lag in the progression of the trough over the Great Lakes. For rainfall amounts through Wednesday, the latest run of the NBM suggest areas south of Pittsburgh could range from 0.20 inches to 0.40 inches; areas near I-80 could range from 0.45 to 0.75 inches. Along with rain, shallow instability (35J/kg to 150J/kg)
may prompt some thunderstorms along the cold front between 4am to 11am Wednesday morning.

With clearing clouds late Wednesday and cold advection, the potential for frost/freeze conditions increases again early Thursday morning. At the moment, confidence is medium that Freeze Warning will be needed north of Pittsburgh and within the ridges. However, the Warning may need to be issued as far south as I-70 if the upper-lvl trough dives farther south.

Cold air will likely exit the region Friday as a ridge axis builds over the Great Lakes in response to a developing low pressure system off the Rockies.

Shower and thunderstorms chances increase late Friday as this noted disturbance advances into the northern Great Lakes.
Organized convection, at the moment, appear promising in areas to our west (Indiana/western Ohio) than over our region due to weak destabilization. However, if high pressure weakens over the East Coast, allowing the advancement of low-lvl moisture under strong bulk shear, there's a chance of severe storms Sunday and/or Monday.

AVIATION /01Z MONDAY THROUGH FRIDAY/
Increasing dry air advection and subsidence under building high pressure has begun to erode the diurnally driven cellular cumulus and will give way to clear skies overnight with wind becoming generally 5 knots or less and backing more southwesterly as mixing ceases.

More VFR cumulus are expected to pop up by midday with a 70-80% chance of bases remaining >5kft, and a bit less moisture should support a FEW/SCT deck. Despite another deep mixed layer depicted by hi res soundings up to 750 mb, not much boundary layer wind will be available to tap into, so should be looking at 10 knots or less through the day with high confidence. High clouds will increase at the end of the TAF period ahead of an approaching upper wave.

Outlook
The approach and passage of a low pressure system late Tuesday into Wednesday will be the next period with restriction potential along with widespread rain. There is high confidence in high pressure supporting VFR conditions to end the work week.

PBZ WATCHES/WARNINGS/ADVISORIES
PA...Frost Advisory from 1 AM to 9 AM EDT Monday for PAZ020-021-029- 031-073-075.
Freeze Warning from 1 AM to 9 AM EDT Monday for PAZ007>009- 013>016-022-074-076>078.
OH...Frost Advisory from 1 AM to 9 AM EDT Monday for OHZ039>041- 048>050-057>059-068-069.
WV...Frost Advisory from 1 AM to 9 AM EDT Monday for WVZ001>004-012- 021-509.
Freeze Warning from 1 AM to 9 AM EDT Monday for WVZ510>512.




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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KIDI INDIANA COUNTY/JIMMY STEWART FLD/,PA 3 sm62 mincalm10 smA Few Clouds32°F27°F80%30.11
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