Alert archive / Mississippi / Tornado Watches in 2015
Tornado Watch 547
The Storm Prediction Center issued this tornado watch at Nov 17, 2015, 12:36 PM CST for Ashley County, Chicot County, Arkansas; 18 parishes in Louisiana; 26 counties in Mississippi. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 17, 2015, 12:36 PM CST (18:36 UTC)
- Expired
- Nov 17, 2015, 8:00 PM CST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 46 counties
Ashley County, AR, Chicot County, AR, Ascension Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Franklin Parish, LA, Iberville Parish, LA, Livingston Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Pointe Coupee Parish, LA, Richland Parish, LA, Saint Helena Parish, LA, Tensas Parish, LA, West Baton Rouge Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Bolivar County, MS, Carroll County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Lawrence County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Pike County, MS, Rankin County, MS, Sharkey County, MS, Simpson County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Wilkinson County, MS, Yazoo County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 114 km from the middle of the area, began a volume at 18:37 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
- 30%
- 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
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 17, 2:28 PM CST | Severe Thunderstorm Warning | JAN | Ashley | 62 min |
| Nov 17, 3:28 PM CST | Severe Thunderstorm Warning | JAN | Ashley, Chicot | 47 min |
| Nov 17, 4:18 PM CST | Severe Thunderstorm Warning | JAN | Bolivar | 57 min |
| Nov 17, 4:59 PM CST | Flash Flood Warning | JAN | Morehouse, Richland, West Carroll | 3 hr |
| Nov 17, 6:37 PM CST | Severe Thunderstorm Warning | JAN | Catahoula, Concordia | 68 min |
| Nov 17, 7:18 PM CST | Severe Thunderstorm Warning | JAN | Madison | 28 min |
| Nov 17, 7:40 PM CST | Severe Thunderstorm Warning | JAN | Concordia, Tensas | 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
Jackson, MS (KJAN), launched 12:00Z, 6.6 hours before the alert went out and 104 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
- 71 J/kg
- Mixed-layer CIN
- -150 J/kg
- Mixed-layer LCL
- 709 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 200 m²/s²
- 0-3 km storm-relative helicity
- 352 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
700 WWUS20 KWNS 171833 SEL7 SPC WW 171833 ARZ000-LAZ000-MSZ000-180200- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 547 NWS STORM PREDICTION CENTER NORMAN OK 1235 PM CST TUE NOV 17 2015 THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF EXTREME SOUTHEAST ARKANSAS EASTERN LOUISIANA WESTERN MISSISSIPPI * EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1235 PM UNTIL 800 PM CST. * PRIMARY THREATS INCLUDE... A FEW TORNADOES POSSIBLE ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE SUMMARY...A LINE OF THUNDERSTORMS INTENSIFYING TO THE WEST OF THE REGION IS EXPECTED TO SPREAD EAST ACROSS THE WATCH AREA THIS AFTERNOON THROUGH THIS EVENING. OTHER STORMS MAY FORM AHEAD OF THE SQUALL LINE BEFORE EVENTUALLY MERGING WITH IT. DAMAGING STRAIGHT-LINE WINDS AND A FEW TORNADOES ARE POSSIBLE WITH THE STRONGEST STORMS. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES SOUTH OF NATCHEZ MISSISSIPPI TO 35 MILES NORTHWEST OF GREENWOOD MISSISSIPPI. 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 545...WW 546... 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 500. MEAN STORM MOTION VECTOR 22035. ...MEAD
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 17, 4:35 AM CST | Mesoscale Discussion | SPC | Benton, Crawford, Franklin, Howard, Johnson, Logan and 9 more | 115 min |
| Nov 17, 4:48 AM CST | Tornado Watch | SPC | Howard, Little River, Miller, Sevier | 4 hr |
| Nov 17, 6:27 AM CST | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Clark, Conway and 21 more | 6 hr |
| Nov 17, 8:24 AM CST | Mesoscale Discussion | SPC | Columbia, Lafayette | 66 min |
| Nov 17, 8:55 AM CST | Tornado Watch | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more | 7 hr |
| Nov 17, 9:59 AM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 58 more | 2 hr |
| Nov 17, 11:07 AM CST | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 21 more | 6 hr |
| Nov 17, 12:19 PM CST | Mesoscale Discussion | SPC | Ashley, Chicot | 116 min |
| Nov 17, 1:35 PM CST | Mesoscale Discussion | SPC | Arkansas, Cleburne, Cleveland, Craighead, Crittenden, Cross and 25 more | 115 min |
| Nov 17, 3:15 PM CST | Tornado Watch | SPC | Craighead, Crittenden, Cross, Lee, Mississippi, Phillips and 2 more | 4 hr |
| Nov 17, 3:19 PM CST | Mesoscale Discussion | SPC | Clay, Fulton, Greene, Izard, Lawrence, Randolph and 1 more | 116 min |
| Nov 17, 5:36 PM CST | Mesoscale Discussion | SPC | Crittenden, Cross, Lee, Monroe, Phillips, Poinsett and 1 more | 84 min |
| Nov 17, 2:51 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 20 more | 84 min |
| Nov 17, 3:33 PM CST | Tornado Watch | SPC | Acadia, Allen, Avoyelles, Calcasieu, Cameron, Evangeline and 6 more | 4 hr |
| Nov 17, 5:54 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Calcasieu, Cameron, Evangeline and 6 more | 96 min |
Nearby
Tornado Watches in Mississippi, 2015Tornado Watches in Louisiana, 2015Tornado Watches in Arkansas, 2015Every tornado watch in 2015
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.