Alert archive / Alabama / Tornado Watches in 2007
Tornado Watch 743
The Storm Prediction Center issued this tornado watch at Dec 20, 2007, 11:50 AM CST for 5 counties in Alabama; 4 counties in Florida. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 20, 2007, 11:50 AM CST (17:50 UTC)
- Expired
- Dec 20, 2007, 5:00 PM CST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties Butler County, AL, Conecuh County, AL, Covington County, AL, Escambia County, AL, Monroe County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL
The radar
The Mobile radar (KMOB), 132 km from the middle of the area, began a volume at 17:53 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 30%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 20, 11:57 AM CST | Severe Thunderstorm Warning | MOB | Choctaw, Clarke, Monroe, Washington | 63 min |
| Dec 20, 1:16 PM CST | Severe Thunderstorm Warning | MOB | Monroe, Wilcox | 33 min |
| Dec 20, 1:35 PM CST | Severe Thunderstorm Warning | MOB | Baldwin, Escambia | 55 min |
| Dec 20, 2:29 PM CST | Severe Thunderstorm Warning | MOB | Santa Rosa | 46 min |
| Dec 20, 2:40 PM CST | Severe Thunderstorm Warning | MOB | Escambia, Santa Rosa | 35 min |
| Dec 20, 3:20 PM CST | Severe Thunderstorm Warning | MOB | Okaloosa, Santa Rosa | 55 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Birmingham, AL (KBMX), launched 12:00Z, 5.8 hours before the alert went out and 213 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 15 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 535 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 20, 10:01 AM CST | Tornado Watch | SPC | Baldwin, Choctaw, Clarke, Mobile, Washington | 5 hr |
| Dec 20, 11:21 AM CST | Mesoscale Discussion | SPC | Baldwin, Choctaw, Clarke, Mobile, Washington | 84 min |
| Dec 20, 1:03 PM CST | Mesoscale Discussion | SPC | Baldwin, Conecuh, Escambia, Mobile, Monroe | 57 min |
Nearby
Tornado Watches in Alabama, 2007Tornado Watches in Florida, 2007Every tornado watch in 2007
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.