FLVL - this is the level at which to calculate frontogenesis. Mid and high must be in small letters. This will calculate the equivalent potential temperature difference and EPV in the 650 to 700 mb layer, the 900 mb frontogenesis, and the potential vorticity advection in the 450-350 mb layer for the 18 h forecast of the 1200 UTC 23 January 1998 Eta model. Advection of potential vorticity - Solid thin red line, only values greater than 0 are shown. Frontogenesis - Dotted white lines.
Every effort is made to post the latest weather information.
However, occasions arise when access may be difficult. If you depend on weather information for mission critical use, read the full notice about accessing National Weather Service information via the Internet, as well as our privacy statement . The NWS is an Equal Opportunity Employer that promotes diversity in the workplace.