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2015 Aug 26] SigWx LL Graphic changeUpdate 2100 UTC 1 September: Due to technical issues, the changes to the SigWx Low Level Chart and forecast Prog Charts were unable to be made on 1 September. The changes are now scheduled to be deployed at 1400 UTC on 2 September. Please note that the forecast Prog Charts will be old until the changes take effect. We apologize for this delay.
Effective September 1, 2015, www.AviationWeather.gov users will see changes on the Prog Charts page
. The current 4-panel Low Level SFC-240 chart will be replaced with a 2-panel chart. The new 2-panel chart will be the same as the top two panels in the current chart, depicting the freezing level and areas of IFR, MVFR, and moderate or greater turbulence. The bottom two panels of the chart will be removed. In lieu of these bottom two panels, an enhanced surface chart that includes fronts, pressure, precipitation type, precipitation intensity, and weather type, will be displayed. The green precipitation polygons will be replaced by shaded precipitation areas using the National Digital Forecast Database (NDFD) weather grid.