Alert archive / Alabama / Tornado Watches in 2007
Tornado Watch 730
The Storm Prediction Center issued this tornado watch at Oct 22, 2007, 11:14 PM CDT for 8 counties in Alabama. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Oct 22, 2007, 11:14 PM CDT (04:14 UTC)
- Expired
- Oct 23, 2007, 12:43 AM CDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
Counties Autauga County, AL, Bibb County, AL, Chilton County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Lowndes County, AL, Perry County, AL
The radar
The Birmingham radar (KBMX), 73 km from the middle of the area, began a volume at 04:13 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 20%
- 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
- 60%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 22, 11:16 PM CDT | Tornado Warning | BMX | Bibb, Hale, Perry | 29 min |
| Oct 22, 11:25 PM CDT | Tornado Warning | BMX | Dallas, Perry | 35 min |
| Oct 23, 12:00 AM CDT | Tornado Warning | BMX | Bibb, Chilton, Dallas, Perry | 45 min |
| Oct 23, 12:27 AM CDT | Severe Thunderstorm Warning | BMX | Autauga, Chilton, Dallas | 33 min |
The nearest sounding before it
Birmingham, AL (KBMX), launched 00:00Z, 4.2 hours before the alert went out and 74 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
- 464 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 563 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 201 m²/s²
- 0-3 km storm-relative helicity
- 241 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.6
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 230411
SEL0
SPC WW 230411
ALZ000-230900-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 730
NWS STORM PREDICTION CENTER NORMAN OK
1110 PM CDT MON OCT 22 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL ALABAMA
EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1110 PM
UNTIL 400 AM CDT.
TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 35 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES EAST NORTHEAST OF
CENTREVILLE ALABAMA TO 45 MILES SOUTH SOUTHWEST OF SELMA ALABAMA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
DISCUSSION...CLUSTER OF SUPERCELL THUNDERSTORMS CONTINUES TO POSE
OCCASIONAL TORNADO RISK...IN ENVIRONMENT CHARACTERIZED BY MOIST LOW
LEVEL PROFILE AND VERY STRONG VERTICAL SHEAR. MOB/BMX VAD PROFILES
INDICATE 3KM SRH VALUES OF 300-500 M2/S2 SUGGESTING THAT THREAT OF
ISOLATED TORNADOES MAY PERSIST FOR A FEW MORE HOURS OVER A SMALL
PART OF CENTRAL AL.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 21030.
...HARTSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 22, 7:29 PM CDT | Mesoscale Discussion | SPC | Mobile | 91 min |
| Oct 23, 12:43 AM CDT | Tornado Watch | SPC | Autauga, Barbour, Blount, Bullock, Butler, Calhoun and 23 more | 6 hr |
| Oct 23, 2:15 AM CDT | Mesoscale Discussion | SPC | Barbour, Chambers, Lee, Russell | 90 min |
| Oct 23, 4:24 AM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 13 more | 96 min |
| Oct 23, 1:45 PM CDT | Mesoscale Discussion | SPC | Lee, Russell | 60 min |
Nearby
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.