• Introduction
  • About the Lesson
  • About Fog
• Case Study: 00 UTC
  • Case Setup
  • TAF
  • METAR
  • Sounding
  • SYNOPS
  • Weather Story
  • Satellite Images and Products
  • Reviewing the Products, Part 1
  • Reviewing the Products, Part 2
  • Building the Weather Story
  • Charts to Check
  • Checking the 00 UTC Charts
  • Checking the 00 to 12 UTC Charts
  • Comparing Obs. Data with NWP
• Case Study: 04 UTC
  • METARs
  • Satellite Products
  • Decision
  • Amending the TAF
  • Amended TAF and Impacts
  • What Happened?
• Summary

Charts to Check

As we continue to develop our weather story, we take the mental model developed while examining the observational data and start to think about how the situation will change over time. We will focus on the 00 UTC to 09 UTC time period and see how evolving conditions will affect aviation operations. But first we will look at the 00 UTC analysis and see how it compares to the observations. If they compare favourably, we can have greater confidence in the forecasts.

Here are the ECMWF charts that we will check. Review the information, then we will examine each one.

CHART	WHAT TO LOOK FOR
Wind vertical profile: sfc to 700 hPa	Wind speed values and how they change with height. Are winds sufficiently weak to promote the formation of radiation fog?
Humidity: sfc to 700	Boundary layer humidity values. Is the atmosphere sufficiently moist to become saturated with additional cooling?
Surface pressure	Areas of relatively high pressure and how the pattern changes with time.