Alert archive / Mississippi / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 752
The Storm Prediction Center issued this severe thunderstorm watch at Aug 8, 2011, 8:39 PM CDT for 8 counties in Arkansas; 18 counties in Mississippi. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 8, 2011, 8:39 PM CDT (01:39 UTC)
- Expired
- Aug 9, 2011, 3:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 26 counties
Arkansas County, AR, Desha County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Monroe County, AR, Phillips County, AR, St. Francis County, AR, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Lafayette County, MS, Leflore County, MS, Marshall County, MS, Montgomery County, MS, Panola County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Yalobusha County, MS
The radar
The Memphis radar (KNQA), 126 km from the middle of the area, began a volume at 01:40 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 8:45 PM CDT | Severe Thunderstorm Warning | LZK | Arkansas, Jefferson, Lonoke, Prairie | 30 min |
| Aug 8, 9:01 PM CDT | Severe Thunderstorm Warning | MEG | Lee, Phillips | 59 min |
| Aug 8, 9:07 PM CDT | Severe Thunderstorm Warning | MEG | Lee, Phillips | 38 min |
| Aug 8, 9:53 PM CDT | Severe Thunderstorm Warning | MEG | Phillips | 36 min |
| Aug 8, 9:56 PM CDT | Severe Thunderstorm Warning | LZK | Jefferson, Lonoke | 34 min |
| Aug 8, 10:07 PM CDT | Severe Thunderstorm Warning | LZK | Arkansas, Jefferson, Lonoke, Prairie | 22 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 (KLZK), launched 00:00Z, 1.7 hours before the alert went out and 82 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
- 4035 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 1436 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 132 m²/s²
- 0-3 km storm-relative helicity
- 156 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 12.0
The text
As transmitted, in the capitals the NWS used until 2016.
936
WWUS20 KWNS 090138
SEL2
SPC WW 090138
ARZ000-MSZ000-090800-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 752
NWS STORM PREDICTION CENTER NORMAN OK
840 PM CDT MON AUG 8 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EASTERN ARKANSAS
NORTHWEST MISSISSIPPI
EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 840 PM UNTIL
300 AM CDT.
HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTHWEST OF
OXFORD MISSISSIPPI TO 55 MILES EAST OF MONTICELLO ARKANSAS. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 746...WW 747...WW
748...WW 750...WW 751...
DISCUSSION...TSTM CLUSTER IN E CNTRL AR HAS BECOME SOMEWHAT BETTER
ORGANIZED IN THE PAST HOUR...WITH COMPOSITE RADAR SHOWING A SIZABLE
AREA OF LOFTED HAIL. COUPLED WITH HIGH PW OVER THE DOWNSTREAM DELTA
REGION AND 25+ KT WNWLY MID LVL FLOW...POTENTIAL WILL EXIST FOR
LOCALLY DMGG PRECIP-ENHANCED WINDS AS THE CLUSTER MOVES/DEVELOPS
GENERALLY ESE TO PERHAPS SEWD LATER TNGT.
AVIATION...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 29025.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 7:34 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Cleburne, Conway and 30 more | 116 min |
| Aug 8, 7:53 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Boone, Carroll, Crawford, Franklin, Johnson and 12 more | 7 hr |
| Aug 8, 11:00 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Clark, Cleburne, Cleveland and 32 more | 2 hr |
| Aug 8, 11:27 PM CDT | Mesoscale Discussion | SPC | Arkansas, Desha, Lee, Lincoln, Monroe, Phillips | 93 min |
| Aug 9, 2:21 AM CDT | Mesoscale Discussion | SPC | Arkansas, Benton, Carroll, Conway, Crawford, Faulkner and 26 more | 84 min |
| Aug 9, 1:20 PM CDT | Mesoscale Discussion | SPC | Clarke, Hinds, Jasper, Kemper, Lauderdale, Leake and 9 more | 115 min |
| Aug 9, 4:46 PM CDT | Severe Thunderstorm Watch | SPC | George, Greene, Perry, Stone, Wayne | 4 hr |
Nearby
Severe Thunderstorm Watches in Mississippi, 2011Severe Thunderstorm Watches in Arkansas, 2011Every severe thunderstorm 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.