Alert archive / Florida / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 40, NWS Miami, FL

September 11, 1994Miami-Dade County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Sep 11, 1994, 12:19 AM EDT for Miami-Dade County, Florida. It was in force for 56 min.

The area

The counties it named.

The facts

Issued
Sep 11, 1994, 12:19 AM EDT (04:19 UTC)
Expired
Sep 11, 1994, 1:15 AM EDT
In force
56 min
Issued by
NWS Miami, FL
Area
Whole counties

County Miami-Dade County, FL

The radar

The Miami radar (KAMX), 9 km from the middle of the area, began a volume at 04:20 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.

The nearest sounding before it

Key West, FL (KEYW), launched 00:00Z, 4.3 hours before the alert went out and 169 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, Key West, FL at 00:00Z on 1994-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2441 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, Key West, FL at 00:00Z on 1994-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
2441 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
766 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
2 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 KMIA 110424 COR
SVRMIA
FLC025-110515-

BULLETIN - IMMEDIATE BROADCAST REQUESTED...CORRECTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
1219 AM EDT SUN SEP 11 1994

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  115 AM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION......

IN SOUTHEAST FLORIDA

   ...DADE COUNTY

AND THE ADJACENT COASTAL WATERS ALONG THE SOUTHEAST FLORIDA COAST

A SEVERE THUNDERSTORM WARNING IS IN EFFECT FOR DADE COUNTY. STRONG
WINDS ALONG WITH HEAVY RAINS WILL CONTINUE ACROSS THE COUNTY.
A CLUSTER OF STRONG THUNDERSTORMS ACROSS DADE COUNTY IS MOVING VERY
SLOWLY AND WILL CONTINUE OVER THE AREA UNTIL AT LEAST 115 AM EDT.

WIND GUSTS OF 50 KNOTS WERE OVERSEVER AT THE NATIONAL WEATHER SERVICE
AT 12:18 AM EDT WITH THESE THUNDERSTORMS.


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 11, 5:58 PM EDTSevere Thunderstorm WarningMFLCollier47 min

Nearby

Severe Thunderstorm Warnings in Florida, 1994Every severe thunderstorm warning in 1994

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; radar from the NEXRAD Level II archive.