Note: This page was updated for the last time on 15-Feb-2009.

Contrail layer forecast examples are shown for the whole Continental United States (CONUS) area (theater Number T02). The charts represent the thickness, - the lower boundary, - and the upper boundary of forecasted contrail layers. Forecasts are based on operational Air Force Weather Agency (AFWA) MM5 Mesoscale Model runs. Contrail layers are derived for commercial aircrafts with a typical exhaust composition as represented by an average contrail factor of CF = 0.037 g/kgK (f.e. Boeing 747 jets). Last update: Sunday, 15-Feb-2009 10:47:47 AKST.

Forecasts are based on operational Air Force Weather Agency (AFWA) MM5 Mesoscale Model runs.

The forecast interval is 18 hours after model initialization; the forecast initialization time (UTC) and forecast hours are indicated on the plot. A 45 km grid-size distance is used. Critical temperatures as threshold for contrail formation are calculated for all model layers and grid- points. Contrail factors represent special aircraft types and may be subject to change for different areal forecast products.