Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 225, NWS Jacksonville, FL

November 2, 2018Putnam County, Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Nov 2, 2018, 4:35 PM EDT for Putnam County, Saint Johns 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
Nov 2, 2018, 4:35 PM EDT (20:35 UTC)
Expired
Nov 2, 2018, 5:15 PM EDT
In force
40 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Putnam County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 81 km from the middle of the area, began a volume at 20:38 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 8.6 hours before the alert went out and 178 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, Cape Canaveral, FL at 12:00Z on 2018-11-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 9 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, Cape Canaveral, FL at 12:00Z on 2018-11-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 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
9 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
963 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 2, 11:50 AM EDTSpecial Weather StatementJAXColumbia, Suwannee40 min
Nov 2, 12:16 PM EDTSpecial Weather StatementJAXColumbia, Gilchrist, Suwannee44 min
Nov 2, 1:34 PM EDTSpecial Weather StatementJAXBaker, Union41 min
Nov 2, 1:47 PM EDTSpecial Weather StatementJAXBaker43 min
Nov 2, 2:08 PM EDTSpecial Weather StatementJAXNassau52 min
Nov 2, 2:52 PM EDTSmall Craft AdvisoryJAX18 hr
Nov 2, 3:09 PM EDTSpecial Marine WarningJAX66 min
Nov 2, 3:28 PM EDTSpecial Weather StatementJAXAlachua47 min
Nov 2, 3:49 PM EDTSpecial Weather StatementJAXMarion41 min
Nov 2, 4:07 PM EDTSpecial Weather StatementJAXFlagler, Putnam, Saint Johns53 min
Nov 2, 4:13 PM EDTSpecial Marine WarningJAX59 min
Nov 2, 4:41 PM EDTSpecial Weather StatementJAXMarion34 min
Nov 2, 4:44 PM EDTSpecial Marine WarningJAX2 hr
Nov 2, 4:59 PM EDTSpecial Weather StatementJAXFlagler46 min
Nov 2, 5:04 PM EDTSpecial Weather StatementJAXSaint Johns26 min
Nov 2, 6:24 PM EDTSpecial Marine WarningJAX36 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.