Alert archive / Mississippi / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 310, NWS Jackson, MS

July 19, 2018Carroll County, Grenada County, Montgomery County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Jul 19, 2018, 11:48 PM CDT for Carroll County, Grenada County, Montgomery County, Mississippi. It was in force for 22 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: Jul 19, 2018, 11:48 PM CDT (04:48 UTC)
Expired: Jul 20, 2018, 12:10 AM CDT
In force: 22 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Carroll County, MS, Grenada County, MS, Montgomery County, MS

The radar

The Columbus AFB radar (KGWX), 140 km from the middle of the area, began a volume at 04:50 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
Jul 20, 12:05 AM CDT	TSTM WND DMG	4 Sse Grenada, MS	A FEW TREES DOWN.

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

The nearest sounding before it

Little Rock, AR (KBYH), launched 00:00Z, 4.8 hours before the alert went out and 123 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: 3860 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1358 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 2.1
Supercell composite: 21.5

Open this sounding in Storm Lab

The text

As transmitted.

693 
WUUS54 KJAN 200448
SVRJAN
MSC015-043-097-200530-
/O.NEW.KJAN.SV.W.0310.180720T0448Z-180720T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jackson MS
1148 PM CDT THU JUL 19 2018

The National Weather Service in Jackson has issued a

* Severe Thunderstorm Warning for...
  North central Carroll County in north central Mississippi...
  Grenada County in north central Mississippi...
  Northwestern Montgomery County in north central Mississippi...

* Until 1230 AM CDT.

* At 1147 PM CDT, a severe thunderstorm was located near Grenada,
  moving south at 35 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...
  Elliott around 1205 AM CDT.
  Jefferson and Duck Hill around 1210 AM CDT.
  North Carrollton around 1220 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3351 8954 3352 9002 3381 9004 3381 8998
      3382 8998 3382 8993 3387 8992 3387 8955
TIME...MOT...LOC 0447Z 356DEG 32KT 3382 8984 

HAIL...1.00IN
WIND...60MPH
 
$$

JM

1 follow-up statement

904 
WWUS54 KJAN 200510
SVSJAN

Severe Weather Statement
National Weather Service Jackson MS
1210 AM CDT FRI JUL 20 2018

MSC015-043-097-200520-
/O.CAN.KJAN.SV.W.0310.000000T0000Z-180720T0530Z/
Carroll MS-Grenada MS-Montgomery MS-
1210 AM CDT FRI JUL 20 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL CARROLL...
GRENADA AND NORTHWESTERN MONTGOMERY COUNTIES IS CANCELLED...
                
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 has been cancelled.

LAT...LON 3351 8954 3352 9002 3381 9004 3381 8998
      3382 8998 3382 8993 3387 8992 3387 8955
TIME...MOT...LOC 0508Z 356DEG 32KT 3361 8982 

$$

JM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 9:31 PM CDT	Severe Thunderstorm Warning	JAN	Bolivar, Sunflower	59 min
Jul 19, 9:58 PM CDT	Severe Thunderstorm Warning	JAN	Bolivar, Sunflower	62 min
Jul 19, 10:47 PM CDT	Severe Thunderstorm Warning	JAN	Bolivar, Sunflower, Washington	73 min
Jul 19, 11:25 PM CDT	Special Weather Statement	JAN	Grenada	50 min
Jul 19, 11:39 PM CDT	Severe Thunderstorm Warning	JAN	Holmes, Humphreys, Leflore, Sharkey, Washington	66 min
Jul 20, 12:41 AM CDT	Special Weather Statement	JAN	Issaquena, Sharkey, Yazoo	64 min
Jul 20, 1:14 AM CDT	Special Weather Statement	JAN	Madison, Yazoo	46 min
Jul 20, 1:24 AM CDT	Severe Thunderstorm Warning	JAN	Hinds, Madison, Warren, Yazoo	53 min
Jul 20, 1:27 AM CDT	Severe Thunderstorm Warning	JAN	Attala, Holmes, Leake, Madison, Yazoo	36 min
Jul 20, 2:10 AM CDT	Special Weather Statement	JAN	Hinds, Rankin	50 min
Jul 20, 9:25 AM CDT	Excessive Heat Warning	JAN	Bolivar, Humphreys, Issaquena, Leflore, Sharkey, Sunflower and 2 more	11 hr
Jul 20, 11:56 AM CDT	Special Weather Statement	JAN	Bolivar	49 min
Jul 20, 12:34 PM CDT	Special Weather Statement	JAN	Sunflower	41 min
Jul 20, 12:51 PM CDT	Severe Thunderstorm Warning	JAN	Leflore, Sunflower	54 min
Jul 20, 1:31 PM CDT	Severe Thunderstorm Warning	JAN	Carroll, Holmes, Humphreys, Leflore	59 min
Jul 20, 2:08 PM CDT	Severe Thunderstorm Warning	JAN	Attala, Holmes, Madison, Yazoo	67 min
Jul 20, 2:35 PM CDT	Special Weather Statement	JAN	Rankin	25 min
Jul 20, 2:55 PM CDT	Special Weather Statement	JAN	Madison	35 min
Jul 20, 4:10 PM CDT	Heat Advisory	JAN	Adams, Bolivar, Claiborne, Copiah, Covington, Forrest and 21 more	28 hr
Jul 20, 4:28 PM CDT	Special Weather Statement	JAN	Covington	32 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.