Alert archive / Mississippi / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 271, NWS Jackson, MS

October 4, 2021Forrest County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Oct 4, 2021, 4:02 PM CDT for Forrest County, Mississippi. It was in force for 43 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: Oct 4, 2021, 4:02 PM CDT (21:02 UTC)
Expired: Oct 4, 2021, 4:45 PM CDT
In force: 43 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Forrest County, MS

The radar

The Mobile radar (KMOB), 103 km from the middle of the area, began a volume at 21:03 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.0 hours before the alert went out and 92 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: 1536 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 714 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

122 
WUUS54 KJAN 042102
SVRJAN
MSC035-042145-
/O.NEW.KJAN.SV.W.0271.211004T2102Z-211004T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jackson MS
402 PM CDT Mon Oct 4 2021

The National Weather Service in Jackson has issued a

* Severe Thunderstorm Warning for...
  Southeastern Forrest County in southeastern Mississippi...

* Until 445 PM CDT.

* At 402 PM CDT, a severe thunderstorm was located 7 miles west of
  Maxie, or 13 miles northwest of Wiggins, moving east at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Maxie around 425 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3100 8934 3100 8935 3103 8935 3103 8915
      3100 8915 3100 8914 3091 8914 3091 8934
TIME...MOT...LOC 2102Z 276DEG 18KT 3096 8932 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DC

2 follow-up statements

425 
WWUS54 KJAN 042129
SVSJAN

Severe Weather Statement
National Weather Service Jackson MS
429 PM CDT Mon Oct 4 2021

MSC035-042145-
/O.CON.KJAN.SV.W.0271.000000T0000Z-211004T2145Z/
Forrest MS-
429 PM CDT Mon Oct 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR SOUTHEASTERN FORREST COUNTY...

At 429 PM CDT, a severe thunderstorm was located over Maxie, or 7
miles northwest of Wiggins, moving east at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

This severe thunderstorm will remain over mainly rural areas of
southeastern Forrest County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3103 8924 3103 8915 3100 8915 3100 8914
      3091 8914 3091 8926
TIME...MOT...LOC 2129Z 276DEG 12KT 3095 8920 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DC

068 
WWUS54 KJAN 042142
SVSJAN

Severe Weather Statement
National Weather Service Jackson MS
442 PM CDT Mon Oct 4 2021

MSC035-042151-
/O.EXP.KJAN.SV.W.0271.000000T0000Z-211004T2145Z/
Forrest MS-
442 PM CDT Mon Oct 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FORREST COUNTY
WILL EXPIRE AT 445 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 3103 8924 3103 8915 3100 8915 3100 8914
      3091 8914 3091 8926
TIME...MOT...LOC 2141Z 276DEG 18KT 3094 8914 

$$

DC

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 3, 7:20 PM CDT	Flash Flood Warning	JAN	Lowndes	115 min
Oct 3, 8:55 PM CDT	Flash Flood Warning	JAN	Neshoba	2 hr
Oct 4, 2:54 AM CDT	Dense Fog Advisory	JAN	Adams, Attala, Carroll, Choctaw, Claiborne, Clay and 30 more	6 hr

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.