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Surface Fronts
In addition to High and Low centers, you may see one or more of these seven features on a surface analysis or forecast:
Key to Features
1 -- Cold Front
2 -- Warm Front
3 -- Stationary Front
4 -- Occluded Front
5 -- Trough ("TROF")
Also used to depict Outflow Boundary ("OUTFLOW BNDRY")
6 -- Squall Line
7 -- Dry Line
8 -- Tropical Wave ("TRPCL WAVE")
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Each surface front and squall line (1, 2, 3, 4, 6 above) is accompanied by a 3-digit label that has a bracket either before or after it. Using the example "[ABC", here
is how to translate the label:
A: Type of Front
0 = stationary
2 = warm
4 = cold
6 = occluded
7 = squall line
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B: Strength of Front
0 = none (applies only to squall line)
1 = weak, weakening
2 = weak
3 = weak, strengthening
4 = moderate, weakening
5 = moderate
6 = moderate, strengthening
7 = strong, weakening
8 = strong
9 = strong, strengthening
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C: Other Characteristics
0 = none
5 = forming
6 = quasi-stationary
7 = with waves
8 = diffuse
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Last Updated
October 30, 2001
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