Definition
A high-resolution weather analysis product produced by the National Weather Service that combines surface observations, radar data, satellite data, and short-range forecast model output to generate a frequently updated picture of current weather conditions across small geographic areas. It is delivered as gridded data covering the contiguous United States, Alaska, Hawaii, Puerto Rico, and Guam, with updates on a sub-hourly cycle.
Plain English
A computer-generated snapshot of what the weather is doing right now over small areas, updated every hour or so, built by blending many weather data sources together.
Context Anchor
Pilots may encounter Real-Time Mesoscale Analysis on aviation weather websites, weather briefing tools, and forecast discussions when checking current conditions over an area rather than at one airport only.
Derivation
Mesoscale comes from the Greek 'mesos' meaning 'middle.' In meteorology, mesoscale refers to weather features of medium size — roughly a few miles to a few hundred miles across — sitting between large-scale systems like fronts and very small features like individual gusts. So 'real-time mesoscale analysis' literally means a current look at medium-sized weather patterns.
Why Pilots Care
Gives pilots precise, current surface conditions that can reveal developing hazards such as low-level wind shear or rapid visibility changes before they appear in broader forecasts.
Grounding Statement
If two airports report different conditions, Real-Time Mesoscale Analysis helps fill in the likely weather between them.
Intuition Check
“Real-time” does not mean there is a live sensor at every spot on the map. Here, it means the product is updated quickly and gives the best current estimate from available weather data.
Example Sentence 1
Before departure, the pilot reviewed the Real-Time Mesoscale Analysis to check the current surface wind pattern across the route.
Example Sentence 2
Before departure the instructor pulled up the Real-Time Mesoscale Analysis to confirm that fog had not yet formed over the valley.