This plot shows forecasted information from the Glocal Forecast System (GFS) model extended MOS surface data. This data include the predicted maximum temperature (colors) and probability of precipitation (POP) for 1 through 7 days.
Maximum temperature contour plot
The maximum temperatures are color contoured with a 5 degree contour interval.
Probability of precipitation plot
The POP data are contoured as well with the 10% line dashed, the areas from 30% to 50% filled with diagonal black lines, and the areas greater than 50% hatched. Therefore, the likely areas of precipitation would show up hatched.
0 - 3000m Helicity
Helicity is used to indicate where rotation/shear is high enough to allow thunderstorms to organize into severe or supercell storms. In the lack of helicity, storms develop vertically and the precipitation will snuff out the updraft killing the thunderstorm. Severe storms need helicity to maintain an organized structure allowing hte storm to develop to severe limits. A value of 400-500 is often needed to produce severe storms. Often this is used in conjunction with CAPE to determine severe storm location.