Alert archive / Mississippi / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 548, NWS Jackson, MS

August 18, 2012Yazoo County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Aug 18, 2012, 1:03 PM CDT for Yazoo County, Mississippi. It was in force for 28 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 18, 2012, 1:03 PM CDT (18:03 UTC)
Expired: Aug 18, 2012, 1:31 PM CDT
In force: 28 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon

County Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 60 km from the middle of the area, began a volume at 18:06 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 was reported inside it

Time	Report	Where	Remark
Aug 18, 1:20 PM CDT	TSTM WND DMG	2 S Benton, MS	TREES DOWNED NEAR HIGHWAY 433 AND SCOTLAND ROAD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 6.1 hours before the alert went out and 54 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1913 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 828 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

364 
WUUS54 KJAN 181803
SVRJAN
MSC163-181845-
/O.NEW.KJAN.SV.W.0548.120818T1803Z-120818T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
103 PM CDT SAT AUG 18 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN YAZOO COUNTY IN CENTRAL MISSISSIPPI...
  THIS INCLUDES THE CITY OF YAZOO CITY...

* UNTIL 145 PM CDT

* AT 104 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  YAZOO CITY MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BENTON AND MYRLEVILLE BY 110 PM CDT...
  BENTON BY 115 PM CDT...
  MIDWAY BY 120 PM CDT...
  VAUGHAN BY 135 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WINDS OF 60 MPH CAN BRING DOWN TREES...POSSIBLY RESULTING IN INJURY
AND PROPERTY DAMAGE. ROOFS OF MOBILE HOMES AND OUTBUILDINGS COULD BE
DAMAGED...AND MINOR ROOF DAMAGE TO WELL BUILT HOMES AND STRUCTURES
COULD OCCUR.

&&

LAT...LON 3295 9017 3288 8997 3284 8999 3283 9002
      3275 9004 3270 9011 3270 9013 3269 9014
      3269 9015 3266 9020 3277 9048 3298 9041
TIME...MOT...LOC 1804Z 275DEG 32KT 3285 9035

$$

19

1 follow-up statement

888 
WWUS54 KJAN 181831
SVSJAN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
131 PM CDT SAT AUG 18 2012

MSC163-181840-
/O.CAN.KJAN.SV.W.0548.000000T0000Z-120818T1845Z/
YAZOO MS-
131 PM CDT SAT AUG 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN YAZOO COUNTY IS
CANCELLED...

THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS WEAKENED 
BELOW SEVERE LIMITS.

HOWEVER...A CLUSTER OF STRONG STORMS REMAINS OVER EASTERN YAZOO 
COUNTY.  THESE STORMS WILL BE CAPABLE OF PRODUCING 40 TO 50 MPH WIND 
GUSTS...VERY HEAVY RAIN...AND CONTINUOUS LIGHTENING.

LAT...LON 3295 9017 3288 8997 3284 8999 3283 9002
      3275 9004 3270 9011 3270 9013 3269 9014
      3269 9015 3266 9020 3277 9048 3298 9041
TIME...MOT...LOC 1830Z 275DEG 32KT 3283 9008

$$

19

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 17, 7:25 PM CDT	Special Weather Statement	JAN	Sharkey	40 min
Aug 17, 7:58 PM CDT	Special Weather Statement	JAN	Leake	42 min
Aug 17, 8:16 PM CDT	Special Weather Statement	JAN	Yazoo	39 min
Aug 17, 11:38 PM CDT	Special Weather Statement	JAN	Bolivar, Sunflower	57 min
Aug 18, 12:19 AM CDT	Severe Thunderstorm Warning	JAN	Bolivar	41 min
Aug 18, 1:08 AM CDT	Special Weather Statement	JAN	Grenada	57 min
Aug 18, 2:33 AM CDT	Special Weather Statement	JAN	Carroll, Choctaw, Montgomery, Oktibbeha, Webster	57 min
Aug 18, 3:26 AM CDT	Special Weather Statement	JAN	Choctaw, Clay, Lowndes, Noxubee, Oktibbeha, Webster and 1 more	59 min
Aug 18, 4:36 AM CDT	Special Weather Statement	JAN	Lowndes, Noxubee	59 min
Aug 18, 7:08 AM CDT	Special Weather Statement	JAN	Winston	32 min
Aug 18, 9:12 AM CDT	Special Weather Statement	JAN	Bolivar	28 min
Aug 18, 9:41 AM CDT	Special Weather Statement	JAN	Bolivar	29 min
Aug 18, 11:25 AM CDT	Special Weather Statement	JAN	Humphreys	30 min
Aug 18, 11:41 AM CDT	Severe Thunderstorm Warning	JAN	Holmes, Humphreys	49 min
Aug 18, 12:26 PM CDT	Special Weather Statement	JAN	Adams	29 min
Aug 18, 12:48 PM CDT	Special Weather Statement	JAN	Yazoo	57 min
Aug 18, 12:53 PM CDT	Special Weather Statement	JAN	Sharkey	47 min
Aug 18, 1:01 PM CDT	Special Weather Statement	JAN	Holmes	59 min
Aug 18, 1:26 PM CDT	Special Weather Statement	JAN	Lawrence	39 min
Aug 18, 1:37 PM CDT	Special Weather Statement	JAN	Adams, Claiborne, Jefferson	58 min
Aug 18, 1:50 PM CDT	Special Weather Statement	JAN	Madison	20 min
Aug 18, 1:53 PM CDT	Special Weather Statement	JAN	Simpson	32 min
Aug 18, 2:01 PM CDT	Special Weather Statement	JAN	Jefferson Davis	44 min
Aug 18, 2:02 PM CDT	Special Weather Statement	JAN	Simpson	48 min
Aug 18, 2:15 PM CDT	Special Weather Statement	JAN	Lawrence	40 min
Aug 18, 2:22 PM CDT	Special Weather Statement	JAN	Hinds	58 min
Aug 18, 2:27 PM CDT	Special Weather Statement	JAN	Neshoba	43 min
Aug 18, 3:01 PM CDT	Special Weather Statement	JAN	Rankin	59 min
Aug 18, 3:31 PM CDT	Special Weather Statement	JAN	Covington	44 min
Aug 18, 3:44 PM CDT	Flash Flood Warning	JAN	Rankin	61 min
Aug 18, 4:20 PM CDT	Special Weather Statement	JAN	Lauderdale, Newton	60 min
Aug 18, 4:30 PM CDT	Severe Thunderstorm Warning	JAN	Lauderdale	45 min
Aug 18, 5:03 PM CDT	Special Weather Statement	JAN	Clarke	32 min
Aug 18, 5:19 PM CDT	Special Weather Statement	JAN	Lauderdale	31 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2012 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.