Alert archive / Mississippi / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 344, NWS Jackson, MS

August 10, 2018Copiah County, Simpson County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Aug 10, 2018, 4:24 PM CDT for Copiah County, Simpson County, Mississippi. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 10, 2018, 4:24 PM CDT (21:24 UTC)
Expired: Aug 10, 2018, 5:05 PM CDT
In force: 41 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Copiah County, MS, Simpson County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 47 km from the middle of the area, began a volume at 21:23 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

Jackson, MS (KJAN), launched 12:00Z, 9.4 hours before the alert went out and 49 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: 1104 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 865 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jackson, MS wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 10, 3:47 PM CDT, 37 minutes earlier.

Area forecast discussion, Aug 10, 3:47 PM CDT, 37 minutes before

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Hazardous weather outlook, Aug 10, 2:43 PM CDT, 1 hour 41 minutes before

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In the hours before

Special weather statement, Aug 10, 12:29 PM CDT, 3 hours 55 minutes before

Special Weather Statement
National Weather Service Jackson MS
1229 PM CDT FRI AUG 10 2018

MSZ061>063-101815-
Lawrence MS-Lincoln MS-Franklin MS-
1229 PM CDT FRI AUG 10 2018

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT LINCOLN...LAWRENCE AND
NORTHEASTERN FRANKLIN COUNTIES UNTIL 115 PM CDT...

At 1228 PM CDT, Meteorologists were tracking strong thunderstorms
along a line extending from Oma to near Mccall Creek. Movement was
southeast at 20 mph.

Winds in excess of 40 mph will be possible with these storms.

Strong thunderstorms will be near...
  Oma and Sontag around 1235 PM CDT.
  Wanilla around 1240 PM CDT.
  Monticello and Center Point around 1255 PM CDT.
  Arm around 110 PM CDT.
  Enterprise and Bogue Chitto around 115 PM CDT.

Other locations impacted by these storms include Silver Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

High winds can bring down trees and large limbs resulting in serious
injury or property damage. Exercise extreme caution when outdoors
during such strong winds...and be especially aware of older trees.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3156 9084 3169 9041 3170 9028 3172 9023
      3175 9011 3169 8997 3152 8998 3152 8996
      3145 8996 3135 9028 3135 9058
TIME...MOT...LOC 1728Z 305DEG 19KT 3171 9017 3155 9071

BYB

Special weather statement, Aug 10, 1:29 PM CDT, 2 hours 55 minutes before

Special Weather Statement
National Weather Service Jackson MS
129 PM CDT FRI AUG 10 2018

MSZ072-101900-
Marion MS-
129 PM CDT FRI AUG 10 2018

...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN MARION COUNTY UNTIL 200
PM CDT...

At 128 PM CDT, Meteorologists were tracking a strong thunderstorm
over Columbia, moving east at 15 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

This strong thunderstorm will be near...
  Pickwick around 140 PM CDT.
  Pinebur around 200 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

High winds can bring down trees and large limbs resulting in serious
injury or property damage. Exercise extreme caution when outdoors
during such strong winds...and be especially aware of older trees.

&&

LAT...LON 3116 8996 3133 8988 3128 8965 3103 8965
      3101 8966
TIME...MOT...LOC 1828Z 292DEG 14KT 3122 8984

BYB

Special weather statement, Aug 10, 1:32 PM CDT, 2 hours 52 minutes before

Special Weather Statement
National Weather Service Jackson MS
132 PM CDT FRI AUG 10 2018

MSZ055-064-065-101900-
Jefferson Davis MS-Covington MS-Simpson MS-
132 PM CDT FRI AUG 10 2018

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN SIMPSON...
NORTHWESTERN COVINGTON AND NORTH CENTRAL JEFFERSON DAVIS COUNTIES
UNTIL 200 PM CDT...

At 132 PM CDT, Meteorologists were tracking a strong thunderstorm
near Clem, or 9 miles south of Magee, moving east at 15 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

This strong thunderstorm will be near...
  Lone Star around 140 PM CDT.
  Mount Olive around 145 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

High winds can bring down trees and large limbs resulting in serious
injury or property damage. Exercise extreme caution when outdoors
during such strong winds...and be especially aware of older trees.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3156 8969 3168 8986 3184 8978 3180 8965
      3178 8965 3178 8961 3175 8951
TIME...MOT...LOC 1832Z 292DEG 14KT 3174 8974

BYB

Special weather statement, Aug 10, 2:09 PM CDT, 2 hours 15 minutes before

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Special weather statement, Aug 10, 2:40 PM CDT, 1 hour 44 minutes before

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Special weather statement, Aug 10, 3:57 PM CDT, 27 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 12:29 PM CDT	Special Weather Statement	JAN	Lawrence, Lincoln	46 min
Aug 10, 1:29 PM CDT	Special Weather Statement	JAN	Marion	31 min
Aug 10, 1:32 PM CDT	Special Weather Statement	JAN	Covington	28 min
Aug 10, 2:40 PM CDT	Special Weather Statement	JAN	Jones	50 min
Aug 10, 3:57 PM CDT	Special Weather Statement	JAN	Copiah	33 min
Aug 10, 6:47 AM CDT	Special Weather Statement	JAN	West Carroll	28 min
Aug 10, 11:58 AM CDT	Special Weather Statement	JAN	Franklin	62 min
Aug 10, 2:09 PM CDT	Special Weather Statement	JAN	Concordia	36 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2018 Every severe thunderstorm warning in 2018

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.