Alert archive / Mississippi / Tornado Watches in 2011
Tornado Watch 243
The Storm Prediction Center issued this tornado watch at Apr 27, 2011, 6:42 PM CDT for 19 counties in Mississippi. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2011, 6:42 PM CDT (23:42 UTC)
- Expired
- Apr 27, 2011, 10:04 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
Counties Clarke County, MS, Covington County, MS, Forrest County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Lowndes County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Winston County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 67 km from the middle of the area, began a volume at 23:44 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
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 7:22 PM CDT | Severe Thunderstorm Warning | JAN | Clarke, Jasper | 53 min |
| Apr 27, 7:51 PM CDT | Severe Thunderstorm Warning | JAN | Kemper, Lauderdale, Newton | 39 min |
| Apr 27, 7:59 PM CDT | Severe Thunderstorm Warning | JAN | Clarke | 46 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, 11.7 hours before the alert went out and 69 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
- 890 J/kg
- Mixed-layer CIN
- -102 J/kg
- Mixed-layer LCL
- 609 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 449 m²/s²
- 0-3 km storm-relative helicity
- 786 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 21.2
The text
As transmitted, in the capitals the NWS used until 2016.
584
WWUS20 KWNS 272335
SEL3
SPC WW 272335
MSZ000-280400-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 243
NWS STORM PREDICTION CENTER NORMAN OK
640 PM CDT WED APR 27 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
EASTERN AND SOUTHERN MISSISSIPPI
EFFECTIVE THIS WEDNESDAY EVENING FROM 640 PM UNTIL 1100 PM CDT.
TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES WEST NORTHWEST OF
COLUMBUS MISSISSIPPI TO 45 MILES WEST SOUTHWEST OF PINE BELT
MISSISSIPPI. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
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 232...WW 235...WW
236...WW 237...WW 238...WW 239...WW 240...WW 241...WW 242...
DISCUSSION...SUPERCELLS NEAR MEI AND NE OF MCB WILL CONTINUE TO
IMPACT THE WW AREA FOR THE NEXT FEW HOURS. ENVIRONMENT REMAINS
SUPPORTIVE OF TORNADOES...DAMAGING WINDS AND HAIL.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24040.
...MEADSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 7:59 PM CDT | Mesoscale Discussion | SPC | Alcorn, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 26 more | 2 hr |
| Apr 26, 9:13 PM CDT | Mesoscale Discussion | SPC | Benton, Bolivar, Coahoma, DeSoto, Marshall, Panola and 3 more | 62 min |
| Apr 26, 9:33 PM CDT | Tornado Watch | SPC | Alcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 41 more | 7 hr |
| Apr 26, 9:58 PM CDT | Tornado Watch | SPC | DeSoto, Tunica | 7 hr |
| Apr 26, 11:33 PM CDT | Mesoscale Discussion | SPC | Alcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 42 more | 117 min |
| Apr 27, 1:56 AM CDT | Mesoscale Discussion | SPC | Clarke, Copiah, Covington, Jasper, Jefferson Davis, Kemper and 11 more | 64 min |
| Apr 27, 2:26 AM CDT | Tornado Watch | SPC | Adams, Alcorn, Attala, Calhoun, Chickasaw, Choctaw and 38 more | 6 hr |
| Apr 27, 4:53 AM CDT | Severe Thunderstorm Watch | SPC | Bolivar, Sunflower, Washington | 5 hr |
| Apr 27, 6:25 AM CDT | Mesoscale Discussion | SPC | Alcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 33 more | 65 min |
| Apr 27, 8:08 AM CDT | Tornado Watch | SPC | Alcorn, Calhoun, Carroll, Chickasaw, Choctaw, Clay and 16 more | 6 hr |
| Apr 27, 9:48 AM CDT | Mesoscale Discussion | SPC | Claiborne, Issaquena, Washington | 27 min |
| Apr 27, 10:45 AM CDT | Mesoscale Discussion | SPC | Adams, Attala, Benton, Calhoun, Carroll, Chickasaw and 53 more | 90 min |
| Apr 27, 11:02 AM CDT | Tornado Watch | SPC | Adams, Alcorn, Attala, Benton, Bolivar, Calhoun and 63 more | 8 hr |
| Apr 27, 1:42 PM CDT | Tornado Watch | SPC | Greene, Perry, Wayne | 8 hr |
| Apr 27, 2:56 PM CDT | Mesoscale Discussion | SPC | Alcorn, Attala, Calhoun, Chickasaw, Choctaw, Clarke and 35 more | 2 hr |
| Apr 27, 5:01 PM CDT | Mesoscale Discussion | SPC | Attala, Chickasaw, Choctaw, Clarke, Clay, Covington and 26 more | 89 min |
| Apr 27, 6:27 PM CDT | Mesoscale Discussion | SPC | Clarke, Clay, Copiah, Covington, Forrest, Jasper and 22 more | 33 min |
Nearby
Tornado Watches in Mississippi, 2011Every tornado watch in 2011
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.