When most people think of sectional aeronautical charts, they picture airspace boundaries, airport symbols, and terrain elevation. But sectional charts also carry a significant amount of weather-related information that every Part 107 remote pilot must understand. Whether you are planning a drone flight near a Class D airport or scoping out a rural photography job, the sectional chart is one of your first planning tools — and knowing how to decode its weather symbology can keep you legal, safe, and ahead of potential surprises.
The FAA's Part 107 knowledge test expects you to interpret sectional charts accurately, and weather-related symbols appear on every chart. This article walks you through the most important weather symbols and overlays that remote pilots encounter, explains what they mean operationally, and highlights the exam traps that catch unprepared applicants.
What a Sectional Chart Actually Shows
A sectional aeronautical chart is a 1:500,000 scale topographic and aeronautical map published by the FAA and updated every 56 days. Despite being primarily a navigation tool, it encodes a surprising amount of weather and airspace information relevant to weather decision-making. For remote pilots, the most operationally important weather-related features fall into four categories: (1) obstructions and terrain that create localized weather hazards, (2) special use airspace tied to weather operations, (3) weather reporting station identifiers and their symbols, and (4) temporary flight restriction (TFR) areas that can arise from weather disasters. Each category is explained below.
Weather Reporting Station Symbols
One of the most directly weather-relevant features on a sectional chart is the depiction of surface aviation weather reporting stations. These are the ground-level observing sites that generate METARs (Meteorological Aerodrome Reports) — the hourly or special weather observations that Part 107 pilots rely on to verify visibility and cloud ceiling conditions before and during flight.
On a sectional chart, each weather reporting station is shown as a small circle at the airport or observing site location. Surrounding that circle is a standard station model — a compact arrangement of numbers and symbols that conveys current or recent weather data when the chart is paired with a current weather depiction. However, it is critical to understand that the static printed sectional chart does not show live weather data. The station model symbols on a sectional chart tell you where a reporting station exists, not what the weather currently is. To get the actual weather, you must pull a current METAR from sources such as aviationweather.gov, ForeFlight, or a flight service briefing.
Why does knowing the station location matter? Because Part 107.51 requires that remote pilots maintain visual line of sight, and Part 107 weather minimums (3 statute miles visibility, 500 feet below clouds, 2,000 feet horizontally from clouds) depend on your ability to assess local conditions. Knowing whether an official weather reporting station is nearby tells you how reliable your weather picture is. A remote area with no nearby METAR station means the official report may be 30 or 40 miles away, potentially reflecting very different conditions.
Special Use Airspace With Weather Implications
Several types of special use airspace (SUA) shown on sectional charts are directly connected to weather operations or research activities that affect drone flights.
Restricted Areas
Restricted areas, depicted on sectional charts with an R followed by a number (for example, R-2508), are blocks of airspace where flight is restricted due to hazardous activities — and some of these activities are weather-related. Certain restricted areas exist over missile ranges, military operations, or — importantly for weather — areas used for weather modification research, upper-air balloon operations, or atmospheric testing. As a remote pilot, you generally cannot enter a restricted area without permission from the controlling agency. Even if the area appears inactive, you must verify its status through NOTAMs or by contacting the controlling agency directly.
Warning Areas
Warning areas generally begin at 3 nautical miles from the U.S. coastline and are depicted with a W followed by a number. These areas may contain activities hazardous to non-participating aircraft, including weather research flights. Although they typically begin just offshore, Part 107 remote pilots should note them when operating near coastal areas and always confirm the specific boundaries shown in the chart legend, as the airspace can sometimes overlap with areas reachable by line of sight from the shore.
Military Operations Areas and Alert Areas
MOAs and Alert Areas are also depicted on sectional charts. Alert Areas (prefix A-) specifically denote areas with a high volume of pilot training or unusual aeronautical activity — this can include student pilots flying through changing weather conditions. While remote pilots do not need permission to fly in Alert Areas, the sectional chart depiction is a reminder that you may share low-altitude airspace with other aircraft, making weather visibility and situational awareness even more critical.
Terrain, Obstructions, and Orographic Weather
Sectional charts use contour lines, elevation tints, and obstruction symbols to depict terrain. For remote pilots, this terrain information has a direct weather implication: elevated terrain creates orographic lift, which can generate localized clouds, fog, and turbulence at altitudes far below what you might expect. A ridge line shown on a sectional chart as a cluster of tight contour lines at 3,000 feet MSL could be the trigger point for mountain wave turbulence or a persistent cloud cap — hazards that affect drone operations even several miles downwind.
Man-made obstructions (towers, antenna farms, power lines) are shown with specific symbols on sectional charts and their heights are annotated in both MSL and AGL. These structures can disrupt local airflow, creating mechanical turbulence and eddies at the very altitudes where drones operate. More subtly, tall structures can affect where fog forms and lingers in calm, radiative cooling conditions, since cool air pools around terrain features and obstructions overnight.
TFRs and Weather Emergencies
Temporary Flight Restrictions (TFRs) are not permanently printed on sectional charts because they are temporary by nature — but the sectional chart is your framework for understanding where TFRs get issued. Weather-related TFRs are authorized under 14 CFR 91.137 and are most commonly issued over areas experiencing natural disasters: hurricanes, wildfires, floods, and tornadoes. These TFRs protect emergency response aircraft operating in exactly the chaotic, low-visibility conditions that accompany such disasters.
A Part 107 remote pilot must always check current NOTAMs for active TFRs before any flight. The sectional chart gives you the geographic context — population centers, coastlines, river corridors — that helps you understand why a TFR might exist in a given area after a weather disaster. Violating a TFR is a serious enforcement matter under 14 CFR Part 107 and can result in certificate suspension or revocation.
Key Numbers and Rules
- Sectional chart scale: 1:500,000 (one inch equals approximately 6.86 nautical miles).
- Chart update cycle: Every 56 days — always use the current edition; weather station symbols and SUA boundaries change.
- Part 107 daytime visibility minimum: 3 statute miles from the control station.
- Cloud clearance under Part 107: 500 feet below and 2,000 feet horizontally from clouds.
- Class B, C, D, and E surface airspace: Require ATC authorization for drone operations; weather minimums apply regardless of authorization.
- TFR compliance: Required by all aircraft including small UAS; check NOTAMs within 24 hours of flight.
- METAR station utility: Officially valid for the immediate airport vicinity — use caution when the nearest station is more than 10 to 15 miles away from your planned operating area.
Common Test Traps
- Treating the printed chart as real-time weather: The sectional chart shows where weather reporting stations are located, not current weather data. Actual conditions require a current METAR, TAF, or PIREP lookup.
- Confusing MSL and AGL obstruction heights: Obstruction symbols on sectional charts list both the MSL altitude and the AGL height. Drone altitude limits under Part 107 (400 feet AGL, or 400 feet above a structure) reference AGL — make sure you read the right number.
- Assuming inactive SUA is accessible: A Restricted Area that appears inactive on the chart is not automatically available to you. You must verify through NOTAMs or contact the controlling agency.
- Ignoring terrain-weather relationships: The test may present a scenario where a mountain range is depicted and ask about expected weather effects. Remember that elevated terrain generates orographic clouds and turbulence on the windward and lee sides.
- Overlooking the chart currency date: Using an expired sectional chart is not just a test issue — it is an operational hazard. SUA boundaries, obstruction data, and airport information all change between editions. Always check the effective date printed in the chart's legend border.
Sectional chart literacy is a foundational skill for Part 107 remote pilots. By understanding how weather reporting stations, special use airspace, terrain, and TFR context all appear on or relate to the sectional chart, you build the situational awareness needed to make sound pre-flight weather decisions — and that is exactly what the FAA tests, and what keeps your operations safe and professional.