Where do I find PIREPs in my weather briefing?

PIREPs are available through the Aviation Weather Center's Aviation Digital Data Service (ADDS), through most electronic flight bag apps, and through standard flight service briefings. Search by route or region and filter by altitude band relevant to your flight.

How old is too old for a PIREP?

There's no hard rule, but reports older than two hours should be treated cautiously, especially for icing or turbulence. Conditions can change significantly with temperature shifts, wind changes, or moving weather systems. A report from 15–30 minutes ago is generally reliable; beyond two hours, verify against current forecasts and other products.

Do I have to file a PIREP if I encounter turbulence or icing?

Under FAR 91, most pilots are not legally required to file PIREPs. However, the FAA strongly encourages them - particularly for icing encounters - and the AIM requests that pilots file urgently for severe or extreme turbulence. Consider it a professional obligation, not just a regulatory one.

What if I encounter icing I'm not equipped for?

Declare the situation to ATC immediately and request priority handling. At the same time, initiate a PIREP - either by filing directly or asking ATC to relay it. Getting the information to other pilots quickly is a safety-of-flight priority.

Can a student pilot or private pilot file a PIREP?

Yes. There is no certificate requirement to file a PIREP. Any pilot who makes an in-flight weather observation can - and should - file one. The information is valuable regardless of the filing pilot's experience level.

The PIREP - The Part of Your Weather Briefing Written by Another Pilot

A Pilot Report - or PIREP - is exactly what it sounds like: a weather observation made by a pilot in flight, shared through ATC or flight service and made available to every other pilot pulling a briefing. It is the only weather product in your preflight package that comes from someone who was actually at altitude, in those conditions, in the recent past. Scrolling past the PIREP block means leaving the most current real-time information on the table.

What Makes a PIREP Different from a METAR or TAF?

METARs are surface observations from automated ground stations. TAFs are meteorologist forecasts. AIRMETs paint broad geographic areas with a wide brush. None of them tell you what’s actually happening at 3,000 feet, 8,000 feet, or 12,000 feet right now.

A PIREP fills that gap. When a pilot reports moderate icing at 8,500 feet over a specific VOR 25 minutes ago, that’s hard data. Forecasters can model icing and turbulence, but models are approximations. A pilot who flew through those conditions gives you ground truth from altitude.

What’s the Difference Between a Routine PIREP (UA) and an Urgent PIREP (UUA)?

Every PIREP begins with one of two designators. UA marks a routine report. UUA marks an urgent report.

The urgent designation is reserved for severe or extreme turbulence, severe icing, or low-level wind shear. When you see UUA at the top of a report, read it carefully before anything else. Someone had a significant encounter and flagged it as a safety-of-flight event.

How Do You Read the PIREP Format?

A PIREP is a standardized string of information, each element separated by a forward slash. Each piece uses a two-letter identifier followed by the data. Here are the fields in order:

OV - Location. Reported over a navaid, waypoint, or airport identifier. OV ABQ places the pilot over Albuquerque. OV ABQ045025 means 045 degrees, 25 nautical miles from Albuquerque. You can pin this on a map.

TM - Time. Zulu time of the observation. This is critical. A report from two hours ago is getting stale. One from fifteen minutes ago is current. A moderate icing report at 0800Z means very little if you’re reviewing it at 1300Z and the temperature profile has shifted.

FL - Flight level. Altitude in hundreds of feet. FL085 means 8,500 feet. You may also see DURD (during), meaning the pilot was climbing or descending through the condition - which helps you understand its vertical extent.

TP - Aircraft type. A Citation encountering light chop and a Cessna 172 encountering light chop are not necessarily describing the same physical event. A heavy jet absorbs turbulence that would be genuinely uncomfortable in a light single. Always calibrate the report against the type that filed it.

SK - Sky cover. PIREPs can report cloud bases and tops - for example, broken cumulus bases at 3,500 feet with tops at 12,000. No surface METAR can tell you that.

WX - Weather. Precipitation and obscurations.

TA - Temperature at altitude. Critical for icing assessment. Two degrees Celsius at 8,000 feet in visible moisture puts you close to the freezing level in IMC. That’s a flag.

WV - Wind at altitude. Direction and velocity. Useful for cross-country planning and for understanding whether reported turbulence is related to wind shear.

TB - Turbulence. See intensity scale below.

IC - Icing. See severity scale below.

RM - Remarks. Free text. Sometimes this is the most useful field in the entire report. A remark like “encountered significant icing at 8,000, climbed to 10,000 and conditions improved” tells you about the vertical profile in a way the structured fields alone cannot.

How Do PIREP Turbulence Intensity Levels Compare?

The FAA Aeronautical Information Manual (AIM) defines four reportable turbulence intensities:

Light - Slight, erratic changes in altitude or attitude. Your coffee bounces around.
Moderate - Similar but more intense. Items shift in the cabin. Passengers grip armrests. Walking is difficult.
Severe - Large, abrupt changes in altitude or attitude. Momentary loss of control is possible. Unbelted occupants can be injured.
Extreme - The aircraft is practically impossible to control. Structural damage is possible.

A UUA with severe or extreme turbulence in your briefing demands a hard look at your route, altitude, and departure timing.

What Do PIREP Icing Severity Levels Mean?

The icing scale runs from trace through light, moderate, and severe:

Trace - Accumulation barely detectable. Generally not hazardous unless encountered for an extended period.
Light - Can become a problem over time, even for aircraft with de-ice equipment.
Moderate - Even short encounters are potentially hazardous. Rate of accumulation is significant.
Severe - Accumulation so rapid that de-icing and anti-icing equipment fails to keep up. Divert immediately.

Under FAR 91, pilots are not generally required to file PIREPs - but icing PIREPs are considered so safety-critical that flight service will specifically request them. If you encounter icing, file a report. The pilot behind you on the same route is counting on it.

How Do PIREPs Factor into Your ACS Evaluation?

Your examiner expects you to pull a PIREP, identify the elements, and apply that information to a go/no-go decision. Not “there was a report about turbulence” - but: What was the location? The altitude? The aircraft type? The severity? How old is the report? How does it change your plan?

Consider this scenario: You’re planning a VFR cross-country at 8,500 feet over mountainous terrain. METARs are clean, destination TAF looks fine. Then you find a UUA - moderate to severe turbulence over a VOR in your route’s middle segment. Aircraft type: Beechcraft Bonanza. Time: 40 minutes ago. Altitude: 8,000 feet. Remarks: “significant mechanical turbulence, recommend avoiding below 10,000.”

That’s another pilot telling you that your planned route, at your planned altitude, was rough enough to file an urgent report less than an hour ago. Does it warrant a route change? A climb to 10,000 if performance allows? A delayed departure to see whether later reports show improvement? Those are the questions your examiner wants to see you ask.

What Does the Absence of PIREPs Tell You?

No PIREPs along your route does not mean conditions are fine. It may simply mean no one has flown that route in the past few hours. Knowing what you don’t know is part of weather situational awareness.

Factor in the absence of reports the same way you’d factor in their presence - as a data point, not a clearance.

How Do You File a PIREP in Flight?

Filing a PIREP is faster than most pilots assume. Call the nearest Flight Service Station - 122.2 is the common frequency - or ask ATC to relay the report. Tell them you have a PIREP. The specialist will guide you through the fields.

Before departure, write the format on your kneeboard: OV / TM / FL / TP / SK / WX / TA / WV / TB / IC / RM. When you encounter something worth reporting, you won’t be fumbling to remember the structure. The actual call takes under a minute.

You don’t need to wait for something dramatic. A report of smooth air, clear below, bases at 6,000, tops at 9,000 is genuinely useful. It confirms the forecast is holding and gives the next pilot confidence to launch.

If you’re flying IFR, ATC can transmit your report to flight service on your behalf - just tell the controller you have a pilot report. For severe or extreme turbulence, file urgently as a UUA by any means available. Call ATC immediately. That’s a safety-of-flight situation and the FAA wants that information disseminated as fast as possible.

Key Takeaways

A PIREP is peer-to-peer weather reporting - real conditions at altitude from a pilot who was recently there, not a model or a surface observation.
UA = routine report; UUA = urgent. UUA means severe turbulence, severe icing, or low-level wind shear. Read those first.
Check the time stamp on every report. Know how old your data is before you rely on it.
Calibrate turbulence and icing reports against aircraft type. A heavy twin calling conditions “light” may describe something a light single would call moderate.
File your own PIREPs - even for smooth conditions. The system only works when pilots contribute to it, not just draw from it.