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Algorithm
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GFS 00Z
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GFS 12Z
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Enhanced GDI and flow -
EGDI.CMD
The Enhanced Galvez-Davison Index (EGDI) is very similar to the GDI, and
diagnoses the potential for convection and rainfall amounts. These loops
include the low- (1000-850hPa) and upper-tropospheric (400-200hPa)
flow and upper divergence (400-200hPa), to evaluate weather systems and regions with dynamics
favorable for ascent. Low-level (1000-700hPa) moisture flux divergence/convergence
diagnoses surface triggers in moist environments.
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Identification of Surface Fronts -
FRONT.CMD
FRONT helps to identify surface fronts in subtropical and extra tropical locations.
Highlights the positions surface fronts based on horizontal gradients of thickness
and dewpoint in the lower troposphere, and precipitable water to a lesser extent.
If present, surface fronts are usually positioned in the warm edge of the gradient
(thick black contours).
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Potential for severity and hail -
GR02T.CMD
GR02T highlights regions with the potential for severe weather
using shades of color, and specifically, detects a potential for hail
where colored boxes appear inside colored contours over a color shaded area.
Includes 500 hPa temperatures as
values < -8°C tend to favor hail when the algorithms shows the potential. Also
includes upper jets and 925-850 hPa low-level flow to find low-level jets.
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Potential for severity and hail for Easter Island / SE Pacific
GR02T.CMD
GR02T highlights regions with the potential for severe weather
using shades of color. It specifically, detects a potential for hail
where colored boxes appear inside colored contours over a color shaded area.
Includes 500 hPa temperatures as values < -8°C tend to favor
hail when the algorithms shows the potential. Also
includes upper jets and 925-850 hPa low-level flow to find low-level jets.
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Note: These algorithms are only forecast tools, not official forecasts.
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weather.gov 
