Alert archive / Mississippi / Tornado Watches in 2014

Tornado Watch 79

April 14, 2014Ashley County, Chicot County, Arkansas; 7 parishes in Louisiana; 22 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Apr 14, 2014, 1:50 AM CDT for Ashley County, Chicot County, Arkansas; 7 parishes in Louisiana; 22 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 14, 2014, 1:50 AM CDT (06:50 UTC)
Expired
Apr 14, 2014, 6:29 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 31 counties

Ashley County, AR, Chicot County, AR, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Leake County, MS, Leflore County, MS, Madison County, MS, Montgomery County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 132 km from the middle of the area, began a volume at 06:53 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
10%
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
5%
Six or more combined severe hail and wind reports
40%

Warnings issued inside it

7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 14, 1:58 AM CDTSevere Thunderstorm WarningJANBolivar, Leflore, Sunflower62 min
Apr 14, 2:39 AM CDTFlash Flood WarningJANCarroll, Holmes, Humphreys3 hr
Apr 14, 3:13 AM CDTFlash Flood WarningJANIssaquena, Warren, Yazoo9 hr
Apr 14, 3:45 AM CDTFlash Flood WarningJANMadison10 hr
Apr 14, 4:09 AM CDTFlash Flood WarningJANEast Carroll7 hr
Apr 14, 4:37 AM CDTFlash Flood WarningJANLeake, Rankin, Scott9 hr
Apr 14, 4:54 AM CDTFlash Flood WarningJANHinds, Rankin6 hr

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 00:00Z, 6.8 hours before the alert went out and 123 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.

Skew-T log-pSkew-T log-p diagram, Jackson, MS at 00:00Z on 2014-04-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 47 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 00:00Z on 2014-04-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
47 J/kg
Mixed-layer CIN
-111 J/kg
Mixed-layer LCL
1517 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
50 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

240 
WWUS20 KWNS 140649
SEL9  
SPC WW 140649
ARZ000-LAZ000-MSZ000-141300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 79
NWS STORM PREDICTION CENTER NORMAN OK
150 AM CDT MON APR 14 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  EXTREME SOUTHEAST ARKANSAS
  NORTHEAST LOUISIANA
  WEST CENTRAL AND CENTRAL MISSISSIPPI

* EFFECTIVE THIS MONDAY MORNING FROM 150 AM UNTIL 800 AM CDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE TORNADOES POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF
GREENWOOD MISSISSIPPI TO 20 MILES SOUTH SOUTHEAST OF MONROE
LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 78...

DISCUSSION...AN ONGOING SQUALL LINE WILL CONTINUE TO MOVE SEWD FROM
AR INTO NW/W CENTRAL MS THIS MORNING WITH A CONTINUED RISK FOR
DAMAGING WINDS BEFORE THE LINE WEAKENS.  A SEPARATE BAND OF WARM
ADVECTION STORMS WILL SPREAD ENEWD FROM LA INTO CENTRAL MS THROUGH
THE EARLY MORNING HOURS.  GIVEN THE OBSERVED STRONG LOW-LEVEL SHEAR
AND SUFFICIENT MOISTENING FOR STORMS BASED NEAR THE GROUND...THERE
WILL BE A RISK FOR A TORNADO OR TWO WITH THE STRONGEST STORMS IN THE
SW PART OF THE CLUSTER.

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 25035.


...THOMPSON

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 13, 7:14 PM CDTSevere Thunderstorm WatchSPCClark, Cleburne, Conway, Crawford, Faulkner, Franklin and 16 more6 hr
Apr 13, 7:54 PM CDTMesoscale DiscussionSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more66 min
Apr 13, 9:12 PM CDTMesoscale DiscussionSPCClay, Craighead, Cross, Fulton, Greene, Independence and 8 more63 min
Apr 13, 10:33 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 49 more57 min
Apr 13, 11:06 PM CDTSevere Thunderstorm WatchSPCArkansas, Bradley, Calhoun, Cleveland, Columbia, Crittenden and 28 more6 hr
Apr 14, 1:22 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 6 more53 min
Apr 14, 2:05 AM CDTMesoscale DiscussionSPCBradley, Calhoun, Columbia, Desha, Drew, Hempstead and 5 more85 min
Apr 14, 4:34 AM CDTMesoscale DiscussionSPCFranklin, Madison, Richland, Tensas56 min
Apr 14, 7:42 AM CDTMesoscale DiscussionSPCBeauregard, Natchitoches, Red River, Sabine, Vernon, Winn2 hr
Apr 14, 10:34 AM CDTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more6 hr
Apr 14, 12:30 PM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 25 more2 hr
Apr 14, 1:11 PM CDTSevere Thunderstorm WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 41 more10 hr
Apr 14, 3:36 PM CDTMesoscale DiscussionSPCAscension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 9 more2 hr

Nearby

Tornado Watches in Mississippi, 2014Tornado Watches in Louisiana, 2014Tornado Watches in Arkansas, 2014Every tornado watch in 2014

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.