Alert archive / Mississippi / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 545, NWS Jackson, MS

August 17, 2012Humphreys County, Sharkey County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Aug 17, 2012, 6:55 PM CDT for Humphreys County, Sharkey County, Mississippi. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 17, 2012, 6:55 PM CDT (23:55 UTC)
Expired: Aug 17, 2012, 7:19 PM CDT
In force: 24 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon

Counties Humphreys County, MS, Sharkey County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 106 km from the middle of the area, began a volume at 23:57 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.

The nearest sounding before it

Little Rock, AR (KBYH), launched 12:00Z, 11.9 hours before the alert went out and 205 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: 486 J/kg
Mixed-layer CIN: -196 J/kg
Mixed-layer LCL: 974 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 105 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.

821 
WUUS54 KJAN 172355
SVRJAN
MSC053-125-180045-
/O.NEW.KJAN.SV.W.0545.120817T2355Z-120818T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
655 PM CDT FRI AUG 17 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN HUMPHREYS COUNTY IN CENTRAL MISSISSIPPI...
  NORTHEASTERN SHARKEY COUNTY IN WEST CENTRAL MISSISSIPPI...

* UNTIL 745 PM CDT

* AT 655 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 6 MILES
  WEST OF MIDNIGHT MOVING EAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MIDNIGHT BY 730 PM CDT...

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 3294 9045 3303 9072 3309 9071 3310 9068
      3312 9069 3312 9070 3316 9069 3316 9045
TIME...MOT...LOC 2355Z 277DEG 8KT 3308 9066

$$

19

1 follow-up statement

240 
WWUS54 KJAN 180019
SVSJAN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
719 PM CDT FRI AUG 17 2012

MSC053-125-180029-
/O.CAN.KJAN.SV.W.0545.000000T0000Z-120818T0045Z/
SHARKEY MS-HUMPHREYS MS-
719 PM CDT FRI AUG 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HUMPHREYS AND
NORTHEASTERN SHARKEY COUNTIES IS CANCELLED...

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

LAT...LON 3294 9045 3303 9072 3309 9071 3310 9068
      3312 9069 3312 9070 3316 9069 3316 9045
TIME...MOT...LOC 0019Z 277DEG 8KT 3307 9060

$$

19

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 7:02 PM CDT	Special Weather Statement	JAN	Lamar	58 min
Aug 16, 7:13 PM CDT	Severe Thunderstorm Warning	JAN	Attala	43 min
Aug 16, 7:18 PM CDT	Severe Thunderstorm Warning	JAN	Lamar, Marion	39 min
Aug 16, 7:28 PM CDT	Special Weather Statement	JAN	Carroll	27 min
Aug 16, 8:05 PM CDT	Special Weather Statement	JAN	Montgomery	45 min
Aug 16, 8:43 PM CDT	Flash Flood Warning	JAN	Attala, Carroll	60 min
Aug 17, 1:58 AM CDT	Special Weather Statement	JAN	Bolivar	32 min
Aug 17, 2:09 AM CDT	Special Weather Statement	JAN	Bolivar	31 min
Aug 17, 2:18 AM CDT	Special Weather Statement	JAN	Leflore	32 min
Aug 17, 2:37 AM CDT	Special Weather Statement	JAN	Washington	28 min
Aug 17, 3:16 AM CDT	Special Weather Statement	JAN	Sharkey	29 min
Aug 17, 4:20 AM CDT	Special Weather Statement	JAN	Lowndes	30 min
Aug 17, 4:58 AM CDT	Flash Flood Warning	JAN	Lowndes, Oktibbeha	2 hr
Aug 17, 5:31 AM CDT	Special Weather Statement	JAN	Hinds, Madison, Rankin	59 min
Aug 17, 6:26 AM CDT	Special Weather Statement	JAN	Copiah, Jasper, Newton, Simpson, Smith	59 min
Aug 17, 6:29 AM CDT	Special Weather Statement	JAN	Clarke, Lauderdale	61 min
Aug 17, 7:13 AM CDT	Special Weather Statement	JAN	Clarke, Jasper	32 min
Aug 17, 9:20 AM CDT	Special Weather Statement	JAN	Issaquena	30 min
Aug 17, 9:25 AM CDT	Special Weather Statement	JAN	Rankin	30 min
Aug 17, 9:41 AM CDT	Severe Thunderstorm Warning	JAN	Issaquena, Sharkey	49 min
Aug 17, 9:48 AM CDT	Special Weather Statement	JAN	Simpson	32 min
Aug 17, 10:08 AM CDT	Special Weather Statement	JAN	Yazoo	32 min
Aug 17, 10:12 AM CDT	Special Weather Statement	JAN	Rankin	33 min
Aug 17, 10:33 AM CDT	Special Weather Statement	JAN	Hinds	32 min
Aug 17, 10:46 AM CDT	Special Weather Statement	JAN	Rankin, Smith	29 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.