Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 216, NWS Jacksonville, FL

September 19, 2018Duval County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Sep 19, 2018, 5:22 PM EDT for Duval County, Florida. It was in force for 20 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
Sep 19, 2018, 5:22 PM EDT (21:22 UTC)
Expired
Sep 19, 2018, 5:42 PM EDT
In force
20 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Duval County, FL

The radar

The Jacksonville radar (KJAX), 17 km from the middle of the area, began a volume at 21:23 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 9.4 hours before the alert went out and 255 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, Tallahassee Rgnl, FL at 12:00Z on 2018-09-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 495 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, Tallahassee Rgnl, FL at 12:00Z on 2018-09-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
495 J/kg
Mixed-layer CIN
-91 J/kg
Mixed-layer LCL
1140 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
21 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 18, 8:26 PM EDTSpecial Weather StatementJAXNassau34 min
Sep 18, 9:32 PM EDTSpecial Weather StatementJAXHamilton28 min
Sep 19, 2:42 PM EDTSpecial Weather StatementJAXMarion33 min
Sep 19, 4:38 PM EDTAreal Flood AdvisoryJAXDuval82 min
Sep 19, 4:57 PM EDTSpecial Weather StatementJAXDuval33 min
Sep 19, 5:01 PM EDTSpecial Weather StatementJAXDuval29 min
Sep 19, 5:12 PM EDTAreal Flood AdvisoryJAXDuval93 min
Sep 19, 5:30 PM EDTSpecial Weather StatementJAXNassau30 min
Sep 19, 5:44 PM EDTSevere Thunderstorm WarningJAXDuval, Nassau31 min
Sep 19, 5:53 PM EDTSpecial Weather StatementJAXAlachua37 min
Sep 19, 6:15 PM EDTSpecial Weather StatementJAXDuval30 min
Sep 19, 6:34 PM EDTAreal Flood AdvisoryJAXDuval, Nassau86 min
Sep 18, 8:05 PM EDTSpecial Weather StatementJAXEchols25 min
Sep 18, 8:36 PM EDTSpecial Weather StatementJAXEchols24 min
Sep 18, 9:05 PM EDTSpecial Weather StatementJAXEchols25 min
Sep 19, 2:02 PM EDTSpecial Weather StatementJAXEchols28 min
Sep 19, 2:29 PM EDTSpecial Weather StatementJAXEchols31 min
Sep 19, 7:40 PM EDTAreal Flood AdvisoryJAXCharlton95 min

Nearby

Severe Thunderstorm Warnings in Florida, 2018Every severe thunderstorm warning in 2018

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.