Alert archive / Florida / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 349, NWS Jacksonville, FL

August 8, 2008Duval County, Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 8, 2008, 5:10 PM EDT for Duval County, Saint Johns County, Florida. It was in force for 35 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
Aug 8, 2008, 5:10 PM EDT (21:10 UTC)
Expired
Aug 8, 2008, 5:45 PM EDT
In force
35 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon

Counties Duval County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 43 km from the middle of the area, began a volume at 21:13 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, 9.2 hours before the alert went out and 268 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 2008-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 434 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 2008-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 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
434 J/kg
Mixed-layer CIN
-91 J/kg
Mixed-layer LCL
955 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
62 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
Aug 8, 12:28 PM EDTSpecial Marine WarningJAX98 min
Aug 8, 1:34 PM EDTSpecial Marine WarningJAX89 min
Aug 8, 1:40 PM EDTSevere Thunderstorm WarningJAXDuval, Saint Johns50 min
Aug 8, 1:54 PM EDTAreal Flood AdvisoryJAXDuval66 min
Aug 8, 2:08 PM EDTSpecial Marine WarningJAX60 min
Aug 8, 2:52 PM EDTAreal Flood AdvisoryJAXDuval, Nassau113 min
Aug 8, 3:02 PM EDTSpecial Marine WarningJAX28 min
Aug 8, 3:08 PM EDTSpecial Marine WarningJAX2 hr
Aug 8, 4:16 PM EDTSpecial Marine WarningJAX89 min
Aug 8, 5:23 PM EDTAreal Flood AdvisoryJAXDuval, Saint Johns52 min
Aug 8, 5:37 PM EDTSpecial Marine WarningJAX113 min
Aug 8, 5:43 PM EDTSpecial Marine WarningJAX92 min
Aug 8, 5:53 PM EDTAreal Flood AdvisoryJAXDuval112 min
Aug 8, 6:44 PM EDTAreal Flood AdvisoryJAXCharlton61 min

Nearby

Severe Thunderstorm Warnings in Florida, 2008Every severe thunderstorm warning in 2008

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.