Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 10, NWS Miami, FL

January 3, 1999Broward County, Miami-Dade County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Jan 3, 1999, 4:20 AM EST for Broward County, Miami-Dade County, Florida. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jan 3, 1999, 4:20 AM EST (09:20 UTC)
Expired
Jan 3, 1999, 5:00 AM EST
In force
40 min
Issued by
NWS Miami, FL
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Broward County, FL, Miami-Dade County, FL

The radar

The Miami radar (KAMX), 31 km from the middle of the area, began a volume at 09:21 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 watch it was issued in

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

IssuedProductOfficeLasted
Jan 3, 12:45 AM ESTTornado WatchSPC5 hr

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 9.3 hours before the alert went out and 20 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 00:00Z on 1999-01-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1088 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 1999-01-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 109 square meters per square second.193958Sfc1 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
1088 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
710 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
109 m²/s²
0-3 km storm-relative helicity
176 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 3, 1:01 AM ESTSevere Thunderstorm WarningMFLCollier29 min
Jan 3, 1:07 AM ESTSevere Thunderstorm WarningMFLGlades38 min
Jan 3, 1:28 AM ESTSevere Thunderstorm WarningMFLCollier47 min
Jan 3, 1:42 AM ESTSevere Thunderstorm WarningMFLGlades48 min
Jan 3, 2:14 AM ESTSevere Thunderstorm WarningMFLCollier, Hendry46 min
Jan 3, 2:37 AM ESTSevere Thunderstorm WarningMFLMonroe53 min
Jan 3, 3:00 AM ESTSevere Thunderstorm WarningMFLBroward, Collier, Hendry, Palm Beach45 min
Jan 3, 3:00 AM ESTSevere Thunderstorm WarningMFLMiami-Dade45 min
Jan 3, 3:40 AM ESTSevere Thunderstorm WarningMFLBroward, Miami-Dade, Palm Beach40 min
Jan 3, 4:20 AM ESTSevere Thunderstorm WarningMFLPalm Beach40 min

Nearby

Severe Thunderstorm Warnings in Florida, 1999Every severe thunderstorm warning in 1999

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.