Alert archive / Alabama / Tornado Watches in 2017
Tornado Watch 27
The Storm Prediction Center issued this tornado watch at Feb 7, 2017, 11:50 AM CST for 12 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 7, 2017, 11:50 AM CST (17:50 UTC)
- Expired
- Feb 7, 2017, 6:00 PM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL
The radar
The Mobile radar (KMOB), 83 km from the middle of the area, began a volume at 17:51 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
- 50%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 7, 1:06 PM CST | Severe Thunderstorm Warning | MOB | Baldwin, Mobile | 39 min |
| Feb 7, 1:11 PM CST | Severe Thunderstorm Warning | MOB | Mobile | 49 min |
| Feb 7, 1:46 PM CST | Severe Thunderstorm Warning | MOB | Baldwin, Mobile | 44 min |
| Feb 7, 2:02 PM CST | Severe Thunderstorm Warning | MOB | Baldwin, Mobile | 58 min |
| Feb 7, 2:58 PM CST | Severe Thunderstorm Warning | MOB | Baldwin, Mobile | 62 min |
| Feb 7, 3:01 PM CST | Severe Thunderstorm Warning | MOB | Baldwin | 59 min |
| Feb 7, 3:59 PM CST | Severe Thunderstorm Warning | MOB | Baldwin, Mobile | 46 min |
| Feb 7, 4:04 PM CST | Severe Thunderstorm Warning | MOB | Baldwin | 41 min |
| Feb 7, 4:44 PM CST | Severe Thunderstorm Warning | MOB | Baldwin | 35 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
Slidell Radar S, LA (KSIL), launched 12:00Z, 5.8 hours before the alert went out and 226 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
- 889 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 562 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 194 m²/s²
- 0-3 km storm-relative helicity
- 190 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.4
The text
As transmitted.
652
WWUS20 KWNS 071748
SEL7
SPC WW 071748
ALZ000-FLZ000-CWZ000-080000-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 27
NWS Storm Prediction Center Norman OK
1150 AM CST Tue Feb 7 2017
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Southwest Alabama
The western Florida Panhandle
Coastal Waters
* Effective this Tuesday morning and evening from 1150 AM until
600 PM CST.
* Primary threats include...
A few tornadoes possible
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
SUMMARY...Clusters of severe storms will continue to spread eastward
from Mississippi into Alabama through the afternoon. The storm
environment will support the potential for a couple of tornadoes and
large hail with embedded rotating storms. Damaging winds will also
be possible with any bowing segments that may evolve from storm
mergers and upscale growth of the storms.
The tornado watch area is approximately along and 70 statute miles
north and south of a line from 25 miles north northwest of Mobile AL
to 15 miles north northeast of Crestview FL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU7).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 26...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 27035.
...ThompsonSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 7, 5:59 AM CST | Mesoscale Discussion | SPC | Baldwin, Choctaw, Clarke, Mobile, Washington | 2 hr |
| Feb 7, 11:20 AM CST | Mesoscale Discussion | SPC | Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more | 115 min |
| Feb 7, 2:44 PM CST | Mesoscale Discussion | SPC | Baldwin, Coffee, Conecuh, Covington, Dale, Escambia and 3 more | 91 min |
| Feb 7, 3:27 PM CST | Severe Thunderstorm Watch | SPC | Bay, Calhoun, Gulf, Holmes, Jackson, Walton and 1 more | 3 hr |
| Feb 7, 4:33 PM CST | Severe Thunderstorm Watch | SPC | Dixie, Franklin, Gadsden, Jefferson, Lafayette, Leon and 4 more | 4 hr |
| Feb 7, 5:24 PM CST | Mesoscale Discussion | SPC | Calhoun, Gadsden, Jefferson, Leon, Liberty, Madison and 2 more | 96 min |
| Feb 7, 5:58 PM CST | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 5 more | 3 hr |
Nearby
Tornado Watches in Alabama, 2017Tornado Watches in Florida, 2017Every tornado watch in 2017
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.