Content of the Meteograms

These are real time meteograms produced by the 12km NAM Model. Here is a sample set of meteograms for Champaign/Urbana, Illinois (725315) for the period beginning at 12Z on the 9th (the 09/12 at the bottom left) and ending at 00Z on the 13th (the 13/00 at the bottom right).


TRACE 1: TMPF, DWPF - Temperature (red), Dew Point (green): 2-meter values in degrees F

TRACE 2: P01M, C01M - Precipitation, Convective Precip: hourly accumulations in inches and

BRBK,WSYM - Wind, Precipitation Type: winds in knots, precipitation type using NAM dominant precip type
For a more complete breakdown of the computation of the precip type in the NAM, go here.

TRACE 3: PMSL, HLCY - Sea Level Pressure in mb (orange, left axis) and Helicity (aqua, right axis): in m**2/s**2, using storm motion based upon the Bunkers Dynamic Method.

TRACE 4: VSBK, CDBP - Horizontal visibility (red, left axis): in MILES, calculated from the Stoelinga-Warner algorithm and Cloud base pressure (purple, right axis) in mb

TRACE 5: CAPE, CINS - Convective Available Potential Energy (brown) and Convective Inhibition (blue, absolute value): in J/kg, computed in GEMPAK using forecast soundings from the model

This product is experimental and is for evaluation only. The forecasts are for the nearest model grid point to the station. Send mail to with your comments.