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Table 2. Comparison of the composite synoptic conditions between weak (F0 or F1) tornado events, significant (F2 or greater) tornado events, and outbreak (five or more F2 or greater) tornado events across the southern Appalachian region.
|
Weak |
Significant |
Outbreak |
|
(156 total events) |
(94 total events) |
(8 total events) |
| Surface temperatures (0C) |
18.5-20.5 |
16.5-18.5 |
18-20 |
| Surface dewpoints (0C) |
17-19 |
15-17 |
16-18 |
| Surface winds (m s-1) |
SW 3.5-4.5 |
SW 5.5-6.5 |
SW 8.5-9.5 |
| 850 hPa temperatures (0C) |
12.5-14 |
11-13 |
12-14 |
| 850 hPa dewpoints (0C) |
9-10 |
8-9 |
10-12 |
| 850 hPa winds (m s-1) |
SW 10-11 |
SW 14-15 |
SW 18-20 |
| 500 hPa trough tilt |
neutral |
neutral |
positive |
| 500 hPa winds (m s-1) |
SW 19-21 |
SW 26-28 |
SW 32.5-37.5 |
| 250 hPa jet quadrant |
none |
right exit |
right exit |
| Lifted index |
-3 |
-2 |
-2 |
| Showalter index |
+3 |
+1 |
0 |
|
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