Alert archive / Mississippi / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 1, NWS Jackson, MS

December 31, 2020Jasper County, Jones County, Smith County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Dec 31, 2020, 8:42 PM CST for Jasper County, Jones County, Smith County, Mississippi. It was in force for 28 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: Dec 31, 2020, 8:42 PM CST (02:42 UTC)
Expired: Dec 31, 2020, 9:10 PM CST
In force: 28 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Jasper County, MS, Jones County, MS, Smith County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 94 km from the middle of the area, began a volume at 02:43 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 00:00Z, 2.7 hours before the alert went out and 103 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: 90 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 802 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: 255 m²/s²
0-3 km storm-relative helicity: 305 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

276 
WUUS54 KJAN 010242
SVRJAN
MSC061-067-129-010330-
/O.NEW.KJAN.SV.W.0001.210101T0242Z-210101T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jackson MS
842 PM CST Thu Dec 31 2020

The National Weather Service in Jackson has issued a

* Severe Thunderstorm Warning for...
  Southwestern Jasper County in east central Mississippi...
  Southeastern Smith County in central Mississippi...
  Northwestern Jones County in southeastern Mississippi...

* Until 930 PM CST.

* At 842 PM CST, a severe thunderstorm was located near Ellisville,
  moving north at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Laurel around 845 PM CST.
  Moss around 900 PM CST.
  Stringer around 905 PM CST.
  Vernon around 915 PM CST.

Other locations impacted by this severe thunderstorm include Soso.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3157 8922 3158 8935 3196 8936 3194 8905
TIME...MOT...LOC 0242Z 187DEG 34KT 3164 8927 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

NF

1 follow-up statement

344 
WWUS54 KJAN 010310
SVSJAN

Severe Weather Statement
National Weather Service Jackson MS
910 PM CST Thu Dec 31 2020

MSC061-067-129-010319-
/O.CAN.KJAN.SV.W.0001.000000T0000Z-210101T0330Z/
Jasper MS-Smith MS-Jones MS-
910 PM CST Thu Dec 31 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN JASPER...
SOUTHEASTERN SMITH AND NORTHWESTERN JONES COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.  However gusty winds are still possible with this
thunderstorm.

LAT...LON 3157 8922 3158 8935 3196 8936 3194 8905
TIME...MOT...LOC 0308Z 187DEG 34KT 3190 8923 

$$

NF

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 31, 8:31 PM CST	Special Weather Statement	JAN	Jones	29 min
Dec 31, 10:44 PM CST	Special Weather Statement	JAN	Claiborne, Franklin, Jefferson	46 min
Jan 1, 12:30 AM CST	Severe Thunderstorm Warning	JAN	Attala, Hinds, Leake, Madison, Yazoo	60 min
Jan 1, 2:34 AM CST	Special Weather Statement	JAN	Choctaw, Neshoba, Winston	26 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2021 Every severe thunderstorm warning in 2021

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.