Alert archive / Mississippi / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 20, NWS Mobile, AL

April 14, 1987Pearl River County, Mississippi

NWS Mobile, AL issued this severe thunderstorm warning at Apr 14, 1987, 2:30 AM CDT for Pearl River County, Mississippi. It was in force for 45 min.

The area

The counties it named.

The facts

Issued
Apr 14, 1987, 2:30 AM CDT (07:30 UTC)
Expired
Apr 14, 1987, 3:15 AM CDT
In force
45 min
Issued by
NWS Mobile, AL
Area
Whole counties

County Pearl River County, MS

The radar

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

The nearest sounding before it

Boothville, LA (KBVE), launched 00:00Z, 7.5 hours before the alert went out and 161 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-pSkew-T log-p diagram, Boothville, LA at 00:00Z on 1987-04-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 225 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Boothville, LA at 00:00Z on 1987-04-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 355 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
225 J/kg
Mixed-layer CIN
-174 J/kg
Mixed-layer LCL
780 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
355 m²/s²
0-3 km storm-relative helicity
342 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMOB 140730
SVRMOB
MSC109-140815-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
230 AM CDT TUE APR 14 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  315 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTHEAST MISSISSIPPI
          ...PEARL.RIVER
 
AT 226 AM A SEVERE THUNDERSTORM WAS INDICATED BY WEATHER SERVICE
RADARS 10 MILES NORTHWEST OF PICAYUNE MISSISSIPPI MOVING TOWARD THE
NORTHEAST AT 40 MPH.  THE MOTION OF THIS STORM WILL TAKE IT NEAR
POPLARVILLE AROUND 245 AM.  DAMAGING WINDS ARE LIKELY.
 
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAZN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Apr 14, 1:15 AM CDT, 1 hour 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
325 AM CDT TUE APR 14 1987

...TORNADO WATCH NUMBER 64 IS IN EFFECT FOR ALL OF SOUTHWEST ALABAMA UNTIL
800 AM.  THE WATCH IS NO LONGER IN EFFECT FOR ANY SOUTHEAST MISSISSIPPI
COUNTY...

THE SEVERE THUNDERSTORN WARNING FOR PEARL-RIVER COUNTY MISSISSIPPI EXPIRED
AT 315 AM.

THE MOBILE RADAR AT 320 AM INDICATED THAT THUNDERSTORM ACTIVITY HAD WEAKENED
OVER SOUTHEAST MISSISSIPPI DURING THE PAST HALF HOUR.  THE STRONGEST STORM
WAS MOVING INTO STONE COUNTY AND CONTINUING NORTHEAST AT 40 MPH.

RESIDENTS IN ALL SOUTHWEST ALABAMA COUNTIES SHOULD REMAIN ALERT FOR THE
POSSIBILITY OF SEVERE WEATHER THIS MORNING. THUNDERSTORMS DEVELOPING OVER
3THE MISSISSIPPI COASTAL WATERS WILL MOVE ASHORE OVER SOUTHWEST ALABAMA LATER
THIS MORNING AND MAY BECOME QUITE INTENSE.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 14, 2:17 AM CDTTornado WarningMOBLamar28 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 1987Every 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; the sounding from the Mesonet's radiosonde archive.