Alert archive / Mississippi / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 49, NWS Jackson, MS

July 25, 1987Marion County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Jul 25, 1987, 4:20 PM CDT for Marion County, Mississippi. It was in force for 25 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 25, 1987, 4:20 PM CDT (21:20 UTC)
Expired: Jul 25, 1987, 4:45 PM CDT
In force: 25 min
Issued by: NWS Jackson, MS
Area: Whole counties

County Marion County, MS

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Jul 25, 4:30 PM CDT	Thunderstorm Wind 0	Marion, MS

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 9.3 hours before the alert went out and 124 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: 542 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1334 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: -3 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.

000 
TTAA00 KJAN 252120
SVRJAN
MSC091-252145-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
420 PM CDT SAT JUL 25 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  445 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTH CENTRAL MISSISSIPPI
          ...MARION
 
AT 420 PM A SEVERE THUNDERSTORM WAS INDICATED OVER EXTREME NORTHEAST
MARION COUNTY.  THIS STORM WAS MO^VING TO THE WEST AT 10 MILES AN HOUR
AND SHOULD PASS NEAR OR NORTH OF COLUMBIA WITHIN THE NEXT 20 MINUTES.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 3:01 PM CDT	Severe Thunderstorm Warning	JAN	Hinds	29 min
Jul 25, 4:56 PM CDT	Severe Thunderstorm Warning	JAN	Adams	34 min
Jul 25, 6:06 PM CDT	Severe Thunderstorm Warning	JAN	Franklin, Lincoln	24 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 1987 Every severe thunderstorm warning in 1987

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.