Alert archive / Mississippi / Tornado Watches in 2012
Tornado Watch 598
The Storm Prediction Center issued this tornado watch at Aug 30, 2012, 3:56 PM CDT for 4 counties in Alabama; 58 counties in Mississippi. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 30, 2012, 3:56 PM CDT (20:56 UTC)
- Expired
- Aug 30, 2012, 10:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Strongest gust expected
- 60 kt
All 62 counties
Choctaw County, AL, Greene County, AL, Sumter County, AL, Washington County, AL, Adams County, MS, Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Clay County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Grenada County, MS, Hancock County, MS, Harrison County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jackson County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Marion County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Sunflower County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Wayne County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 34 km from the middle of the area, began a volume at 20:58 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
- 30%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 5%
- 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
- 30%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 4:53 PM CDT | Flash Flood Warning | JAN | Washington | 112 min |
| Aug 30, 4:57 PM CDT | Flash Flood Warning | JAN | Jones | 3 hr |
| Aug 30, 5:16 PM CDT | Tornado Warning | JAN | Forrest | 14 min |
| Aug 30, 6:39 PM CDT | Flash Flood Warning | JAN | Bolivar, Washington | 111 min |
| Aug 30, 8:10 PM CDT | Tornado Warning | JAN | Jasper | 50 min |
| Aug 30, 8:23 PM CDT | Tornado Warning | JAN | Covington, Jasper, Jones, Smith | 37 min |
| Aug 30, 8:41 PM CDT | Flash Flood Warning | LIX | Walthall | 3 hr |
| Aug 30, 8:44 PM CDT | Tornado Warning | LIX | Walthall | 31 min |
| Aug 30, 8:48 PM CDT | Tornado Warning | JAN | Jefferson Davis, Lawrence, Marion | 42 min |
| Aug 30, 8:48 PM CDT | Tornado Warning | JAN | Newton | 45 min |
| Aug 30, 9:03 PM CDT | Flash Flood Warning | JAN | Jefferson Davis, Lawrence, Marion | 117 min |
| Aug 30, 9:29 PM CDT | Tornado Warning | JAN | Neshoba | 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, 8.9 hours before the alert went out and 35 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
- 107 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 501 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 473 m²/s²
- 0-3 km storm-relative helicity
- 650 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
041
WWUS20 KWNS 302057
SEL8
SPC WW 302057
ALZ000-LAZ000-MSZ000-CWZ000-310300-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 598
NWS STORM PREDICTION CENTER NORMAN OK
400 PM CDT THU AUG 30 2012
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
EXTREME WESTERN ALABAMA
SOUTHEAST LOUISIANA
MISSISSIPPI
COASTAL WATERS
EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 400 PM UNTIL
1000 PM CDT.
TORNADOES...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS
LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST NORTHWEST OF
JACKSON MISSISSIPPI TO 45 MILES SOUTHEAST OF MERIDIAN
MISSISSIPPI. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
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 597...
DISCUSSION...FAVORABLE WIND PROFILES CONTINUE OVER THE ERN
SEMI-CIRCLE OF TD ISAAC AS IT MOVES SLOWLY NNWWD OVER NRN LA. VAD
WINDS AT KDGX...KGWX AND KMOB MAINTAIN STRONG LOW LEVEL WINDS AND
SHEAR SUPPORTIVE OF SHALLOW SUPERCELL STRUCTURES INTO THE EVENING
HOURS...WITH A CONTINUING THREAT FOR ISOLATED TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH EXTREME
TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI
WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION VECTOR 18035.
...WEISSSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 8:21 PM CDT | Mesoscale Discussion | SPC | Baldwin, Mobile, Washington | 84 min |
| Aug 29, 11:06 PM CDT | Mesoscale Discussion | SPC | Baldwin, Mobile, Washington | 84 min |
| Aug 29, 11:42 PM CDT | Tornado Watch | SPC | Mobile, Washington | 8 hr |
| Aug 30, 3:18 AM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 7 more | 117 min |
| Aug 30, 6:33 AM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 13 more | 117 min |
| Aug 30, 7:13 AM CDT | Tornado Watch | SPC | Autauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 15 more | 9 hr |
| Aug 30, 12:57 PM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Choctaw, Clarke, Conecuh, Dallas and 8 more | 93 min |
Nearby
Tornado Watches in Mississippi, 2012Tornado Watches in Alabama, 2012Every tornado watch in 2012
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.