DCAPE

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JohnShewchuk
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Joined: Fri Nov 28, 2003 5:54 pm
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DCAPE

Post by JohnShewchuk »

Does anyone know of, or is there a standard set of threshold values for DCAPE with respect to Weak, Moderate, or Strong storm potential?

Tim Vasquez
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Post by Tim Vasquez »

I just heard back from Richard Thompson (SPC forecaster)...
he had this to say:

"DCAPE values tend to be lower for F2+ tornado environments, and larger
for damaging wind/hail environments, though the differences aren't
terribly large.

DCAPE range subjective interpretation
< 600 J/kg "small"
600-1000 J/kg "modest"
1000-1400 J/kg "large"
> 1400 J/kg "extreme"

In other words, the majority of significant wind events (65 kt or
greater) have been associated with DCAPE > 1000 J/kg, while significant
tornadoes are more common with DCAPE < 800-1000 J/kg. These numbers
are based on a sample of several thousand observed proximity soundings
(within 100 nmi and +/- 3 hrs) for "significant" severe events (Jeff
Craven and Harold Brooks), and a separate sample of several hundred RUC-
2 analysis soundings (within 25 nmi and +/- 30 minutes) for documented
supercells (Thompson, Edwards, etc.)."

JohnShewchuk
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Posts: 65
Joined: Fri Nov 28, 2003 5:54 pm
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Post by JohnShewchuk »

Thanks for the information ... just what I needed.

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