Alert archive / Mississippi / Tornado Warnings in 2015

Tornado Warning 12, NWS Jackson, MS

April 18, 2015Simpson County, Smith County, Mississippi

NWS Jackson, MS issued this tornado warning at Apr 18, 2015, 6:03 PM CDT for Simpson County, Smith County, Mississippi. It was in force for 42 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: Apr 18, 2015, 6:03 PM CDT (23:03 UTC)
Expired: Apr 18, 2015, 6:45 PM CDT
In force: 42 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Simpson County, MS, Smith County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 52 km from the middle of the area, began a volume at 23:03 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.

What was reported inside it

Time	Report	Where	Remark
Apr 18, 6:21 PM CDT	TORNADO	1 Sse Magee, MS	REPORT OF BRIEF TOUCHDOWN WITH NO DAMAGE

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

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 11.1 hours before the alert went out and 60 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 654 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 43 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.

265 
WFUS54 KJAN 182303
TORJAN
MSC127-129-182345-
/O.NEW.KJAN.TO.W.0012.150418T2303Z-150418T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSON MS
603 PM CDT SAT APR 18 2015

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN SIMPSON COUNTY IN CENTRAL MISSISSIPPI...
  SOUTHWESTERN SMITH COUNTY IN CENTRAL MISSISSIPPI...

* UNTIL 645 PM CDT
    
* AT 603 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED OVER MAGEE...MOVING NORTHEAST AT 20 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. 
           DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE 
           DAMAGE IS LIKELY. 

* THIS TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
  SOUTHEASTERN SIMPSON AND SOUTHWESTERN SMITH COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3184 8987 3203 8969 3194 8949 3178 8970
      3178 8972
TIME...MOT...LOC 2303Z 218DEG 16KT 3185 8974 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

JC

1 follow-up statement

902 
WWUS54 KJAN 182325
SVSJAN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
625 PM CDT SAT APR 18 2015

MSC127-129-182345-
/O.CON.KJAN.TO.W.0012.000000T0000Z-150418T2345Z/
SIMPSON MS-SMITH MS-
625 PM CDT SAT APR 18 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR EAST
CENTRAL SIMPSON AND SOUTHWESTERN SMITH COUNTIES...
    
AT 623 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 
WAS LOCATED ABOUT THREE MILES NORTHEAST OF MAGEE...MOVING NORTHEAST 
AT 15 MPH.

HAZARD...TORNADO. 

SOURCE...RADAR INDICATED ROTATION. 

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
         SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE 
         TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE DAMAGE IS 
         LIKELY. 

THIS TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
EAST CENTRAL SIMPSON AND SOUTHWESTERN SMITH COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3189 8971 3203 8969 3194 8949 3183 8964
      3183 8967
TIME...MOT...LOC 2323Z 217DEG 14KT 3191 8968 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

JC

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 9:13 PM CDT	River Flood Warning	JAN	Attala, Holmes	14 days
Apr 18, 5:55 PM CDT	Severe Thunderstorm Warning	JAN	Simpson, Smith	50 min
Apr 18, 6:19 PM CDT	Special Weather Statement	JAN	Jones	26 min
Apr 18, 6:36 PM CDT	Severe Thunderstorm Warning	JAN	Jones	39 min
Apr 18, 6:41 PM CDT	Flash Flood Warning	JAN	Copiah	2 hr
Apr 18, 6:45 PM CDT	Severe Thunderstorm Warning	JAN	Smith	29 min

Nearby

Tornado Warnings in Mississippi, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.