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Forecasting Tool Currently Available
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GFS 00Z
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GFS 12Z
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Severe Weather and Hail Environments -
GR02T.CMD
GR02T highlights regions with a general the potential for severe weather
with shades of color, and specifically detects a potential for hail
where colored boxes appear inside colored contours over a color shaded area.
Includes 925-850 hPa and 250-500 hPa winds to include impacts of low-level
and upper jets on the analysis of the severe weather and hail potential.
In addition, 500 hPa temperatures in contours show where mid-level short wave
troughs might be present, and where temperatures are sufficiently cold to
favor hail. In the Caribbean, these are often temperatures cooler than -8°C.
More information in the
GR02T Algorithm Legend
. A quick guide is on the works.
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Galvez-Davison Index and Dynamics -
GDID.CMD
The Galvez-Davison Index describes convective instability favorable for tropical
and subtropical convection. Yet, analyzing atmospheric dynamics is required
to know whether the atmosphere might be capable of utilizing this instability
to produce convection. The GDID tool plots the GDI in colors and overlays
low-level flow, low-level moisture flux convergence and divergence,
upper level flow and upper level divergence to better forecast regions
where convection and precipitation might develop.
GDID Algorithm Legend
A quick guide is on the works.
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Front and Airmass Characterization
FRAM.CMD
(for Eastern Island, Southeastern Pacific and Southern Cone)
FRAM helps to identify surface fronts and airmasses of different characteristics.
It uses horizontal gradients of thickness and dewpoint in the lower troposphere,
and five variables to plot the magnitude of gradients between airmasses.
1000-925 hPa winds and 1000-925 hPa enhanced moisture flux convergence, included with boxes,
aid with the placement surface boundaries.
More information in the
FRAM Algorithm Legend
. A quick guide is on the works.
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Front and Airmass Characterization
FRAM.CMD
(for subtropical South America, south Atlantic and Paraná Basin)
FRAM helps to identify surface fronts and airmasses of different characteristics.
It uses horizontal gradients of thickness and dewpoint in the lower troposphere,
and five variables to plot the magnitude of gradients between airmasses.
1000-925 hPa winds and 1000-925 hPa enhanced moisture flux convergence, included with boxes,
aid with the placement surface boundaries.
More information in the
FRAM Algorithm Legend
. A quick guide is on the works.
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Severe Weather and Hail Environments
GR02T.CMD
(for Eastern Island, Southeastern Pacific and Southern Cone)
In the Southeast Pacific and in Chile, GR02T does not necessarily detect the potential for
hail and severity as in continental South America east of the Andes. But it could
signal the occurrence of thunderstorms and potentially large rainfall rates.
In some instances, it could signal a potential for graupel from cold air
cumulus located at high latitudes.
More information in the
GR02T Algorithm Legend
. A quick guide is on the works.
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Not Available
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Note: These algorithms are only forecast tools, not official forecasts.
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weather.gov 
