Alert archive / Florida / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 70, NWS Miami, FL

September 21, 1996Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Sep 21, 1996, 4:42 PM EDT for Palm Beach County, Florida. It was in force for 63 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
Sep 21, 1996, 4:42 PM EDT (20:42 UTC)
Expired
Sep 21, 1996, 5:45 PM EDT
In force
63 min
Issued by
NWS Miami, FL
Area
Whole counties

County Palm Beach County, FL

What was reported inside it

TimeReportWhereRemark
Sep 21, 4:45 PM EDTThunderstorm Wind 50West Palm Beach, FL

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 nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 8.7 hours before the alert went out and 93 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, Miami, FL at 12:00Z on 1996-09-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1635 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, Miami, FL at 12:00Z on 1996-09-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 square meters per square second.1939Sfc1 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
1635 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
825 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
57 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMIA 212045
SVRMIA
FLC099-FLZ502-212145-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MIAMI FL
442 PM EDT SAT SEP 21 1996
 
THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  545 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN SOUTHEAST FLORIDA
 
   ...EASTERN PALM BEACH COUNTY AND COASTAL WATERS FROM JUPITER
      INLET TO LAKE WORTH...
 
AT 439 PM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM IN THE VICINITY OF PALM BEACH MOVING NORTHEAST AT 20 MPH.
 
DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN A SEVERE THUNDERSTORM. SEEK
SHELTER IN A STRONG BUILDING. STAY AWAY FROM WINDOWS. DO NOT USE
TELEPHONES OR ELECTRICAL APPLIANCES.

The office that day

Everything else NWS Miami, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 21, 2:35 PM EDTSevere Thunderstorm WarningMFLMiami-Dade55 min
Sep 21, 3:17 PM EDTSevere Thunderstorm WarningMFLBroward58 min
Sep 21, 4:53 PM EDTSevere Thunderstorm WarningMFLMiami-Dade67 min

Nearby

Severe Thunderstorm Warnings in Florida, 1996Every severe thunderstorm warning in 1996

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.