Alert archive / Alabama / Tornado Watches in 2017
Tornado Watch 182
The Storm Prediction Center issued this tornado watch at Apr 30, 2017, 10:36 AM CDT for 33 counties in Alabama; 15 counties in Mississippi. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2017, 10:36 AM CDT (15:36 UTC)
- Expired
- Apr 30, 2017, 7:00 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 48 counties
Autauga County, AL, Baldwin County, AL, Bibb County, AL, Blount County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Colbert County, AL, Cullman County, AL, Dallas County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Marengo County, AL, Marion County, AL, Mobile County, AL, Monroe County, AL, Morgan 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, Winston County, AL, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Monroe County, MS, Pontotoc County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Yalobusha County, MS
The radar
The Columbus AFB radar (KGWX), 32 km from the middle of the area, began a volume at 15:38 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
- 10%
- 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
- 60%
Warnings issued inside it
30 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 10:50 AM CDT | Severe Thunderstorm Warning | MEG | DeSoto, Marshall, Tate | 40 min |
| Apr 30, 10:57 AM CDT | Severe Thunderstorm Warning | MEG | Lafayette, Pontotoc, Union | 48 min |
| Apr 30, 10:59 AM CDT | Severe Thunderstorm Warning | MEG | Lafayette, Pontotoc, Union | 46 min |
| Apr 30, 11:11 AM CDT | Severe Thunderstorm Warning | BMX | Greene, Pickens, Sumter | 64 min |
| Apr 30, 11:28 AM CDT | Tornado Warning | BMX | Pickens, Sumter | 47 min |
| Apr 30, 11:36 AM CDT | Severe Thunderstorm Warning | MEG | Alcorn, Benton, Tippah | 39 min |
| Apr 30, 11:46 AM CDT | Tornado Warning | BMX | Lamar | 44 min |
| Apr 30, 11:53 AM CDT | Severe Thunderstorm Warning | BMX | Lamar, Marion | 52 min |
| Apr 30, 12:12 PM CDT | Severe Thunderstorm Warning | BMX | Fayette, Greene, Pickens, Tuscaloosa | 63 min |
| Apr 30, 12:19 PM CDT | Tornado Warning | BMX | Fayette, Lamar, Marion | 14 min |
| Apr 30, 12:37 PM CDT | Severe Thunderstorm Warning | BMX | Marion | 23 min |
| Apr 30, 12:39 PM CDT | Tornado Warning | BMX | Fayette | 22 min |
| Apr 30, 12:51 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Franklin, Lauderdale | 39 min |
| Apr 30, 12:54 PM CDT | Severe Thunderstorm Warning | BMX | Marion, Walker, Winston | 66 min |
| Apr 30, 12:55 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Franklin, Lawrence | 50 min |
| Apr 30, 1:02 PM CDT | Severe Thunderstorm Warning | MOB | Washington | 58 min |
| Apr 30, 1:06 PM CDT | Severe Thunderstorm Warning | MOB | Choctaw, Clarke, Washington | 39 min |
| Apr 30, 1:12 PM CDT | Severe Thunderstorm Warning | BMX | Bibb, Jefferson, Tuscaloosa, Walker | 63 min |
| Apr 30, 1:25 PM CDT | Severe Thunderstorm Warning | HUN | Cullman | 35 min |
| Apr 30, 1:28 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Lauderdale, Lawrence | 32 min |
| Apr 30, 1:38 PM CDT | Severe Thunderstorm Warning | HUN | Lauderdale, Lawrence, Limestone, Morgan | 52 min |
| Apr 30, 1:45 PM CDT | Severe Thunderstorm Warning | BMX | Blount, Jefferson | 60 min |
| Apr 30, 1:46 PM CDT | Severe Thunderstorm Warning | MOB | Choctaw, Clarke, Washington | 59 min |
| Apr 30, 1:52 PM CDT | Severe Thunderstorm Warning | HUN | Cullman, Lawrence, Limestone, Morgan | 38 min |
| Apr 30, 1:56 PM CDT | Tornado Warning | HUN | Lauderdale, Limestone | 19 min |
| Apr 30, 2:00 PM CDT | Severe Thunderstorm Warning | MOB | Clarke, Mobile, Washington | 60 min |
| Apr 30, 2:09 PM CDT | Tornado Warning | HUN | Cullman, Morgan | 21 min |
| Apr 30, 2:21 PM CDT | Severe Thunderstorm Warning | HUN | Cullman, Limestone, Madison, Marshall, Morgan | 39 min |
| Apr 30, 2:41 PM CDT | Severe Thunderstorm Warning | BMX | Blount, Etowah | 64 min |
| Apr 30, 5:49 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin, Escambia | 41 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 144 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
- 53 J/kg
- Mixed-layer CIN
- -333 J/kg
- Mixed-layer LCL
- 867 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 224 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
835 WWUS20 KWNS 301534 SEL2 SPC WW 301534 ALZ000-MSZ000-010000- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 182 NWS Storm Prediction Center Norman OK 1035 AM CDT Sun Apr 30 2017 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Western Alabama Northern Mississippi * Effective this Sunday morning and evening from 1035 AM until 700 PM CDT. * Primary threats include... A few tornadoes possible Scattered damaging wind gusts to 70 mph possible SUMMARY...An extensive line of storms will progress east from Mississippi into Alabama through this afternoon. Damaging winds and a few tornadoes will be possible. The tornado watch area is approximately along and 75 statute miles east and west of a line from 30 miles west northwest of Muscle Shoals AL to 65 miles southwest of Selma AL. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU2). 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 181... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 550. Mean storm motion vector 25030. ...Grams
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 10:06 AM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Chilton, Colbert, Coosa, Cullman and 16 more | 84 min |
| Apr 30, 1:21 PM CDT | Mesoscale Discussion | SPC | Cherokee, Cleburne, DeKalb, Etowah, Jackson, Madison and 1 more | 54 min |
| Apr 30, 1:36 PM CDT | Tornado Watch | SPC | Calhoun, Chambers, Cherokee, Clay, Cleburne, Coosa and 10 more | 5 hr |
| Apr 30, 3:42 PM CDT | Mesoscale Discussion | SPC | Autauga, Calhoun, Chambers, Cherokee, Clay, Cleburne and 8 more | 2 hr |
| Apr 30, 12:54 AM CDT | Mesoscale Discussion | SPC | Bolivar, Coahoma, DeSoto, Panola, Quitman, Sunflower and 3 more | 96 min |
| Apr 30, 1:10 AM CDT | Severe Thunderstorm Watch | SPC | DeSoto, Tunica | 6 hr |
| Apr 30, 1:14 AM CDT | Mesoscale Discussion | SPC | Adams, Claiborne, Jefferson, Wilkinson | 91 min |
| Apr 30, 1:49 AM CDT | Tornado Watch | SPC | Adams, Claiborne, Franklin, Issaquena, Jefferson, Sharkey and 3 more | 7 hr |
| Apr 30, 2:58 AM CDT | Mesoscale Discussion | SPC | DeSoto, Marshall, Tate, Tunica | 92 min |
| Apr 30, 5:41 AM CDT | Mesoscale Discussion | SPC | DeSoto, Tunica | 64 min |
| Apr 30, 6:12 AM CDT | Mesoscale Discussion | SPC | Adams, Amite, Claiborne, Franklin, Issaquena, Jefferson and 4 more | 93 min |
| Apr 30, 6:59 AM CDT | Mesoscale Discussion | SPC | Amite, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 50 more | 2 hr |
| Apr 30, 7:32 AM CDT | Tornado Watch | SPC | Amite, Attala, Carroll, Choctaw, Clarke, Clay and 42 more | 7 hr |
Nearby
Tornado Watches in Alabama, 2017Tornado Watches in Mississippi, 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.