Alert archive / Alabama / Tornado Watches in 2018
Tornado Watch 48
The Storm Prediction Center issued this tornado watch at Apr 14, 2018, 10:36 AM CDT for 28 counties in Alabama; Escambia County, Santa Rosa County, Florida; 7 counties in Mississippi. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 14, 2018, 10:36 AM CDT (15:36 UTC)
- Expired
- Apr 14, 2018, 7:00 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 65 kt
All 37 counties
Autauga County, AL, Baldwin County, AL, Bibb County, AL, Blount County, AL, Butler County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Dallas County, AL, Escambia County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lowndes County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Santa Rosa County, FL, George County, MS, Greene County, MS, Harrison County, MS, Jackson County, MS, Perry County, MS, Stone County, MS, Wayne County, MS
The radar
The Birmingham radar (KBMX), 99 km from the middle of the area, began a volume at 15:39 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
- 30%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
26 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 14, 10:58 AM CDT | Severe Thunderstorm Warning | MOB | Greene, Perry, Wayne | 62 min |
| Apr 14, 11:08 AM CDT | Severe Thunderstorm Warning | BMX | Lamar, Pickens | 56 min |
| Apr 14, 11:22 AM CDT | Severe Thunderstorm Warning | BMX | Sumter | 43 min |
| Apr 14, 11:36 AM CDT | Tornado Warning | BMX | Fayette, Lamar | 24 min |
| Apr 14, 11:50 AM CDT | Severe Thunderstorm Warning | MOB | Perry, Stone | 55 min |
| Apr 14, 11:53 AM CDT | Severe Thunderstorm Warning | BMX | Fayette, Marion | 52 min |
| Apr 14, 11:55 AM CDT | Severe Thunderstorm Warning | BMX | Greene, Pickens | 65 min |
| Apr 14, 11:59 AM CDT | Severe Thunderstorm Warning | MOB | Choctaw, Clarke, Washington | 61 min |
| Apr 14, 12:05 PM CDT | Tornado Warning | BMX | Greene, Pickens | 25 min |
| Apr 14, 12:24 PM CDT | Severe Thunderstorm Warning | BMX | Tuscaloosa | 81 min |
| Apr 14, 12:34 PM CDT | Tornado Warning | BMX | Walker, Winston | 20 min |
| Apr 14, 12:41 PM CDT | Tornado Warning | BMX | Tuscaloosa | 13 min |
| Apr 14, 1:07 PM CDT | Tornado Warning | BMX | Hale | 16 min |
| Apr 14, 1:25 PM CDT | Flash Flood Warning | LIX | Hancock, Harrison, Jackson | 9 hr |
| Apr 14, 1:39 PM CDT | Severe Thunderstorm Warning | BMX | Bibb, Dallas, Hale, Marengo, Perry | 41 min |
| Apr 14, 1:50 PM CDT | Flash Flood Warning | MOB | Perry, Stone | 6 hr |
| Apr 14, 1:54 PM CDT | Flash Flood Warning | MOB | Greene, Perry, Wayne | 6 hr |
| Apr 14, 2:06 PM CDT | Tornado Warning | LIX | Harrison | 11 min |
| Apr 14, 2:35 PM CDT | Flash Flood Warning | MOB | Choctaw, Washington | 6 hr |
| Apr 14, 3:46 PM CDT | Flash Flood Warning | MOB | Clarke, Washington | 6 hr |
| Apr 14, 3:50 PM CDT | Flash Flood Warning | MOB | George, Greene, Perry, Stone | 6 hr |
| Apr 14, 4:53 PM CDT | Flash Flood Warning | MOB | Washington | 6 hr |
| Apr 14, 5:33 PM CDT | Flash Flood Warning | BMX | Dallas, Marengo, Perry | 4 hr |
| Apr 14, 6:14 PM CDT | Flash Flood Warning | MOB | Clarke, Washington, Wilcox | 6 hr |
| Apr 14, 6:16 PM CDT | Tornado Warning | LIX | Jackson | 29 min |
| Apr 14, 6:57 PM CDT | Severe Thunderstorm Warning | MOB | Mobile | 20 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, 3.6 hours before the alert went out and 100 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
- 224 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 560 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 275 m²/s²
- 0-3 km storm-relative helicity
- 324 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.7
The text
As transmitted.
484
WWUS20 KWNS 141534
SEL8
SPC WW 141534
ALZ000-FLZ000-MSZ000-CWZ000-150000-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 48
NWS Storm Prediction Center Norman OK
1030 AM CDT Sat Apr 14 2018
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
southwest through central Alabama
western Florida Panhandle
southeast Mississippi
Coastal Waters
* Effective this Saturday morning and evening from 1030 AM until
700 PM CDT.
* Primary threats include...
A few tornadoes and a couple intense tornadoes possible
Scattered damaging winds likely with isolated significant gusts
to 75 mph possible
SUMMARY...Squall line will continue to pose a risk for locally
strong to damaging wind gusts and a few tornadoes as it moves
through the Gulf Coast states this afternoon.
The tornado watch area is approximately along and 70 statute miles
east and west of a line from 20 miles north of Birmingham AL to 40
miles south southwest of Mobile AL. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU8).
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 47...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1.5 inches. Extreme turbulence and surface wind
gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 25030.
...DialSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 14, 4:35 AM CDT | Mesoscale Discussion | SPC | Colbert, Fayette, Franklin, Lamar, Lauderdale, Marion and 1 more | 115 min |
| Apr 14, 6:37 AM CDT | Mesoscale Discussion | SPC | Sumter | 83 min |
| Apr 14, 9:40 AM CDT | Mesoscale Discussion | SPC | Autauga, Baldwin, Bibb, Butler, Chilton, Choctaw and 18 more | 95 min |
| Apr 14, 12:41 PM CDT | Mesoscale Discussion | SPC | Autauga, Baldwin, Bibb, Butler, Chilton, Choctaw and 18 more | 94 min |
| Apr 14, 2:56 PM CDT | Mesoscale Discussion | SPC | Autauga, Chilton, Coosa, Dallas, Lowndes, Mobile and 5 more | 94 min |
| Apr 14, 6:17 PM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Clarke, Conecuh, Covington, Escambia and 2 more | 118 min |
| Apr 14, 6:55 PM CDT | Tornado Watch | SPC | Baldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 7 more | 6 hr |
| Apr 13, 7:22 PM CDT | Tornado Watch | SPC | Adams, Bolivar, Claiborne, Franklin, Issaquena, Jefferson and 4 more | 3 hr |
| Apr 13, 10:12 PM CDT | Tornado Watch | SPC | Adams, Alcorn, Benton, Bolivar, Calhoun, Carroll and 33 more | 10 hr |
| Apr 14, 2:10 AM CDT | Mesoscale Discussion | SPC | Adams, Attala, Benton, Bolivar, Calhoun, Carroll and 32 more | 2 hr |
| Apr 14, 6:57 AM CDT | Tornado Watch | SPC | Amite, Attala, Choctaw, Clarke, Clay, Copiah and 30 more | 7 hr |
Nearby
Tornado Watches in Alabama, 2018Tornado Watches in Mississippi, 2018Tornado Watches in Florida, 2018Every tornado watch in 2018
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.