Alert archive / Mississippi / Tornado Watches in 2017
Tornado Watch 287
The Storm Prediction Center issued this tornado watch at May 27, 2017, 9:59 PM CDT for 4 counties in Arkansas; 15 counties in Mississippi; 13 counties in Tennessee. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 27, 2017, 9:59 PM CDT (02:59 UTC)
- Expired
- May 28, 2017, 12:21 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 70 kt
All 32 counties
Crittenden County, AR, Cross County, AR, Lee County, AR, St. Francis County, AR, Alcorn County, MS, Benton County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Chester County, TN, Crockett County, TN, Decatur County, TN, Fayette County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Shelby County, TN, Tipton County, TN
The radar
The Memphis radar (KNQA), 10 km from the middle of the area, began a volume at 03:02 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
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 10:00 PM CDT | Severe Thunderstorm Warning | MEG | Crockett, Dyer, Gibson, Haywood, Lauderdale, Madison | 45 min |
| May 27, 10:29 PM CDT | Severe Thunderstorm Warning | MEG | Crittenden, Cross, Mississippi, Poinsett | 46 min |
| May 27, 10:38 PM CDT | Severe Thunderstorm Warning | MEG | Carroll, Crockett, Dyer, Gibson, Haywood, Lauderdale and 1 more | 52 min |
| May 27, 10:49 PM CDT | Severe Thunderstorm Warning | MEG | Chester, Decatur, Hardin, Henderson, McNairy, Madison | 41 min |
| May 27, 10:51 PM CDT | Severe Thunderstorm Warning | MEG | Crittenden, St. Francis | 54 min |
| May 27, 11:04 PM CDT | Severe Thunderstorm Warning | MEG | Crittenden | 41 min |
| May 27, 11:14 PM CDT | Tornado Warning | MEG | Chester, Decatur, Hardin, Henderson | 13 min |
| May 27, 11:23 PM CDT | Severe Thunderstorm Warning | MEG | Chester, Decatur, Hardeman, Hardin, Henderson, McNairy and 1 more | 52 min |
| May 27, 11:41 PM CDT | Severe Thunderstorm Warning | MEG | Crittenden | 36 min |
| May 27, 11:43 PM CDT | Severe Thunderstorm Warning | MEG | Alcorn, Benton, Itawamba, Lee, Prentiss, Tippah and 2 more | 62 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
Little Rock, AR (KBYH), launched 00:00Z, 3.0 hours before the alert went out and 52 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
- 3385 J/kg
- Mixed-layer CIN
- -56 J/kg
- Mixed-layer LCL
- 1096 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 157 m²/s²
- Significant tornado parameter
- 2.5
- Supercell composite
- 15.1
The text
As transmitted.
927 WWUS20 KWNS 280257 SEL7 SPC WW 280257 ARZ000-MSZ000-TNZ000-281000- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 287 NWS Storm Prediction Center Norman OK 1000 PM CDT Sat May 27 2017 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Eastern Arkansas Northern Mississippi Western Tennessee * Effective this Saturday night and Sunday morning from 1000 PM until 500 AM CDT. * Primary threats include... A couple tornadoes possible Isolated significant damaging wind gusts to 80 mph possible Isolated very large hail events to 2 inches in diameter possible SUMMARY...A fast-moving convective line will continue to move southeastward across eastern Arkansas into western Tennessee, including the Memphis metro area. The most intense storms will favor areas along and south/southwest of an arcing outflow boundary, with widespread damaging winds a distinct possibility aside from some line-embedded tornado risk. These storms will eventually move into northern Mississippi overnight. The tornado watch area is approximately along and 50 statute miles north and south of a line from 35 miles south southwest of Jonesboro AR to 50 miles northeast of Tupelo MS. 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 279...WW 280...WW 281...WW 282...WW 284...WW 285...WW 286... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 2 inches. Extreme turbulence and surface wind gusts to 70 knots. A few cumulonimbi with maximum tops to 600. Mean storm motion vector 30035. ...Guyer
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 7:01 PM CDT | Tornado Watch | SPC | Baxter, Boone, Clay, Cleburne, Conway, Craighead and 20 more | 6 hr |
| May 27, 9:26 PM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Independence and 8 more | 94 min |
| May 27, 11:47 PM CDT | Mesoscale Discussion | SPC | Crawford, Sebastian, Washington | 58 min |
| May 28, 12:06 AM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Columbia, Crawford, Franklin, Hempstead and 10 more | 5 hr |
| May 28, 12:18 AM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 36 more | 6 hr |
| May 28, 12:52 AM CDT | Mesoscale Discussion | SPC | Howard, Montgomery, Polk | 23 min |
| May 28, 2:11 AM CDT | Mesoscale Discussion | SPC | Arkansas, Clark, Cleveland, Dallas, Desha, Faulkner and 12 more | 2 hr |
| May 28, 2:53 AM CDT | Mesoscale Discussion | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 6 more | 2 hr |
| May 28, 4:59 AM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Cleveland, Columbia and 9 more | 2 hr |
| May 27, 11:46 PM CDT | Mesoscale Discussion | SPC | Calhoun, Carroll, Chickasaw, Choctaw, Clay, Grenada and 12 more | 59 min |
| May 28, 10:59 AM CDT | Mesoscale Discussion | SPC | George, Hancock, Harrison, Jackson, Pearl River, Stone | 2 hr |
| May 27, 7:02 PM CDT | Mesoscale Discussion | SPC | Bedford, Cannon, Cheatham, Coffee, Davidson, DeKalb and 18 more | 58 min |
| May 27, 9:07 PM CDT | Severe Thunderstorm Watch | SPC | Franklin, Giles, Lawrence, Lincoln, Moore, Wayne | 8 hr |
| May 27, 9:46 PM CDT | Mesoscale Discussion | SPC | Anderson, Bledsoe, Blount, Bradley, Carter, Claiborne and 24 more | 89 min |
Nearby
Tornado Watches in Mississippi, 2017Tornado Watches in Tennessee, 2017Tornado Watches in Arkansas, 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.