Alert archive / Alabama / Tornado Watches in 2018
Tornado Watch 49
The Storm Prediction Center issued this tornado watch at Apr 14, 2018, 6:55 PM CDT for 13 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida; George County, Greene County, Mississippi. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 14, 2018, 6:55 PM CDT (23:55 UTC)
- Expired
- Apr 15, 2018, 12:43 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Baldwin County, AL, Butler County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dallas County, AL, Escambia County, AL, Lowndes County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, George County, MS, Greene County, MS
The radar
The Mobile radar (KMOB), 87 km from the middle of the area, began a volume at 23:58 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
- 50%
- 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 |
|---|---|---|---|---|
| Apr 14, 6:57 PM CDT | Severe Thunderstorm Warning | MOB | Mobile | 20 min |
| Apr 14, 9:03 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin | 42 min |
| Apr 14, 9:22 PM CDT | Flash Flood Warning | BMX | Dallas, Perry | 6 hr |
| Apr 14, 9:50 PM CDT | Severe Thunderstorm Warning | MOB | Butler, Conecuh, Covington | 40 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, 11.9 hours before the alert went out and 235 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
- 1802 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 534 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 222 m²/s²
- 0-3 km storm-relative helicity
- 293 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 12.6
The text
As transmitted.
673 WWUS20 KWNS 142353 SEL9 SPC WW 142353 ALZ000-FLZ000-MSZ000-CWZ000-150700- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 49 NWS Storm Prediction Center Norman OK 650 PM CDT Sat Apr 14 2018 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Southern Alabama Florida Panhandle Far southeast Mississippi Coastal Waters * Effective this Saturday night and Sunday morning from 650 PM until 200 AM CDT. * Primary threats include... A few tornadoes and a couple intense tornadoes possible Scattered damaging wind gusts to 70 mph possible SUMMARY...Storms are expected to persist and gradually intensify along composite outflow across the region with a gradual east/northeastward acceleration this evening. Increasing low-level shear and the presence of a weak area of low pressure will maintain long/somewhat curved low-level wind profiles supportive of a quasi-linear convective mode with embedded supercells/mesovortices capable of a few tornadoes along with damaging winds. The tornado watch area is approximately along and 60 statute miles east and west of a line from 40 miles west northwest of Troy AL to 70 miles south of Gulfport MS. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU9). 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 48... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 24025. ...Guyer
SPC 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, 10:36 AM CDT | Tornado Watch | SPC | Autauga, Baldwin, Bibb, Blount, Butler, Chilton and 22 more | 8 hr |
| 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 13, 7:22 PM CDT | Tornado Watch | SPC | Catahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more | 3 hr |
| Apr 13, 8:54 PM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 10 more | 66 min |
| Apr 13, 9:53 PM CDT | Tornado Watch | SPC | Beauregard, Bienville, Bossier, Caddo, Caldwell, Claiborne and 14 more | 8 hr |
| Apr 13, 10:12 PM CDT | Tornado Watch | SPC | Catahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more | 10 hr |
| Apr 14, 2:10 AM CDT | Mesoscale Discussion | SPC | Allen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 20 more | 2 hr |
| Apr 14, 6:57 AM CDT | Tornado Watch | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 22 more | 7 hr |
Nearby
Tornado Watches in Alabama, 2018Tornado Watches in Florida, 2018Tornado Watches in Mississippi, 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.