Alert archive / Mississippi / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 87, NWS Mobile, AL

April 5, 1997Perry County, Mississippi

NWS Mobile, AL issued this severe thunderstorm warning at Apr 5, 1997, 11:56 AM CST for Perry County, Mississippi. It was in force for 64 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: Apr 5, 1997, 11:56 AM CST (17:56 UTC)
Expired: Apr 5, 1997, 1:00 PM CST
In force: 64 min
Issued by: NWS Mobile, AL
Area: Whole counties

County Perry County, MS

The radar

The Mobile radar (KMOB), 90 km from the middle of the area, began a volume at 18:00 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 5, 12:15 PM CST	Thunderstorm Wind 50	Kittrell, MS	Several trees were blown down near Kittrell.

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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 5, 9:00 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.9 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: 356 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 503 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 411 m²/s²
0-3 km storm-relative helicity: 442 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

630 
WUUS1 KMOB 051801
SVRMOB
MSC111-051900-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTED
NATIONAL WEATHER SERVICE MOBILE AL
1156 AM CST SAT APR 5 1997

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  100 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHEAST MISSISSIPPI

   ...PERRY COUNTY

AT 1155 AM CST...MOBILE DOPPLER WEATHER RADAR INDICATED A SEVERE
THUNDERSTORM ENTERING SOUTHWEST PERRY COUNTY WHICH WILL AFFECT NEW
AUGUSTA BY 1215 PM.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

...CORRECTED TIME REFERENCE IN BODY FROM PM TO AM

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 5, 11:53 AM CST	Severe Thunderstorm Warning	MOB	Stone	67 min
Apr 5, 12:15 PM CST	Severe Thunderstorm Warning	MOB	Wayne	45 min
Apr 5, 12:25 PM CST	Severe Thunderstorm Warning	MOB	Greene	65 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 1997 Every severe thunderstorm warning in 1997

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; radar from the NEXRAD Level II archive.