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Domain 9: Central South America
Chile, Central and Northern Argentina, Uruguay, Paraguay and Southern Brazil
Graphics use 1° GFS Model Output
Terrain elevation in meters above sea level.
Source: GFS0.25°(NOMADS-NOAA).
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ALGORITHM
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GFS 00Z
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GFS 12Z
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Identification of Surface Fronts -
FRONT.CMD
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.
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Potential for severity and hail -
GR02.CMD
Highlights regions with the potential for severe
convection, and specifically hail in Central South America.
The potential increases when red (fuscia) contours appear
with red (fuscia) boxes inside.
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Enhanced GDI and flow -
EGDI.CMD
Very similar to the GDI, the Enhanced GDI (EGDI) diagnoses the
potential for convection and rainfall accumulations. Loops include low- and
upper-tropospheric flow and other variables to evaluate if atmospheric
dynamics are favorable for triggering and/or sustaining convection.
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Note: These algorithms are only forecast tools, not official forecasts.
For information on the algorithms, click on the red text.
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weather.gov 
