Alert archive / Florida / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 45, NWS Jacksonville, FL

April 19, 20194 counties in Florida; Camden County, Glynn County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 19, 2019, 12:26 PM EDT for 4 counties in Florida; Camden County, Glynn County, Georgia. It was in force for 49 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: Apr 19, 2019, 12:26 PM EDT (16:26 UTC)
Expired: Apr 19, 2019, 1:15 PM EDT
In force: 49 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Clay County, FL, Duval County, FL, Nassau County, FL, Saint Johns County, FL, Camden County, GA, Glynn County, GA

The radar

The Jacksonville radar (KJAX), 6 km from the middle of the area, began a volume at 16:25 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.

Issued	Product	Office	Lasted
Apr 19, 10:13 AM EDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 4.4 hours before the alert went out and 6 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 822 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 632 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 303 m²/s²
0-3 km storm-relative helicity: 279 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 7.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 19, 11:36 AM EDT, 50 minutes earlier.

Area forecast discussion, Apr 19, 11:36 AM EDT, 50 minutes before

Area Forecast Discussion
National Weather Service Jacksonville FL
1136 AM EDT Fri Apr 19 2019

.UPDATE...

Quick moving line of severe storms will continue to track east
across the region into the afternoon. Embedded tornadoes will
remain a potential with this line. An area of showers with
embedded thunderstorms will follow this main line.

Winds will remain gusty following this line as well due to a
tight pressure gradient across the region.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  78  48  64  47 / 100   0   0   0
SSI  81  53  69  53 / 100   0   0   0
JAX  84  52  71  50 / 100   0   0   0
SGJ  85  53  72  53 / 100  10  10   0
GNV  81  52  70  48 / 100  20  10   0
OCF  82  53  71  48 / 100  20  20   0

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...Wind Advisory until 8 PM EDT this evening for Baker-Bradford-
     Central Marion-Clay-Coastal Duval-Coastal Flagler-Coastal
     Nassau-Coastal St. Johns-Eastern Alachua-Eastern Marion-
     Gilchrist-Hamilton-Inland Duval-Inland Flagler-Inland
     Nassau-Inland St. Johns-Northern Columbia-Putnam-Southern
     Columbia-Suwannee-Union-Western Alachua-Western Marion.

     High Rip Current Risk until 8 PM EDT this evening for Coastal
     Duval-Coastal Flagler-Coastal Nassau-Coastal St. Johns.

GA...Wind Advisory until 8 PM EDT this evening for Appling-Atkinson-
     Bacon-Brantley-Clinch-Coastal Camden-Coastal Glynn-Coffee-
     Echols-Inland Camden-Inland Glynn-Jeff Davis-Northeastern
     Charlton-Northern Ware-Pierce-Southern Ware-Wayne-Western
     Charlton.

     High Rip Current Risk until 8 PM EDT this evening for Coastal
     Camden-Coastal Glynn.

AM...Gale Warning until 11 PM EDT this evening for Coastal waters
     from Altamaha Sound to Fernandina Beach FL out 20 NM-
     Coastal waters from Fernandina Beach to St. Augustine FL
     out 20 NM-Coastal waters from St. Augustine to Flagler
     Beach FL out 20 NM-Waters from Altamaha Sound GA to
     Fernandina Beach FL from 20 to 60 NM-Waters from Fernandina
     Beach to St. Augustine FL from 20 to 60 NM-Waters from St.
     Augustine to Flagler Beach FL from 20 to 60 NM.

&&

23

In the hours before

Local storm report, Apr 19, 12:12 PM EDT, 14 minutes before

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Local storm report, Apr 19, 12:13 PM EDT, 13 minutes before

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Local storm report, Apr 19, 12:14 PM EDT, 12 minutes before

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Local storm report, Apr 19, 12:16 PM EDT, 10 minutes before

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Local storm report, Apr 19, 12:19 PM EDT, 7 minutes before

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Local storm report, Apr 19, 12:22 PM EDT, 4 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 11:50 PM EDT	Wind Advisory	JAX	Alachua, Baker, Bradford, Duval, Flagler, Gilchrist and 4 more	20 hr
Apr 19, 12:38 AM EDT	Special Marine Warning	JAX		67 min
Apr 19, 1:39 AM EDT	Special Marine Warning	JAX		66 min
Apr 19, 3:00 AM EDT	Special Marine Warning	JAX		60 min
Apr 19, 3:12 AM EDT	Rip Current Statement	JAX	Duval, Flagler, Nassau	17 hr
Apr 19, 5:08 AM EDT	Special Marine Warning	JAX		67 min
Apr 19, 9:43 AM EDT	Severe Thunderstorm Warning	JAX	Hamilton, Suwannee	47 min
Apr 19, 10:15 AM EDT	Severe Thunderstorm Warning	JAX	Columbia, Hamilton	45 min
Apr 19, 10:19 AM EDT	Severe Thunderstorm Warning	JAX	Columbia, Gilchrist, Hamilton, Suwannee	41 min
Apr 19, 10:56 AM EDT	Tornado Warning	JAX	Baker, Columbia	19 min
Apr 19, 11:00 AM EDT	Severe Thunderstorm Warning	JAX	Alachua, Baker, Bradford, Columbia, Gilchrist, Union	60 min
Apr 19, 11:33 AM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval, Nassau, Saint Johns	57 min
Apr 19, 11:35 AM EDT	Special Marine Warning	JAX		115 min
Apr 19, 11:49 AM EDT	Tornado Warning	JAX	Nassau	26 min
Apr 19, 11:54 AM EDT	Severe Thunderstorm Warning	JAX	Alachua, Clay, Marion, Putnam	66 min
Apr 19, 12:45 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Marion, Putnam, Saint Johns	45 min
Apr 19, 12:50 PM EDT	Special Marine Warning	JAX		85 min
Apr 19, 12:51 PM EDT	Special Weather Statement	JAX	Flagler	54 min
Apr 19, 1:11 PM EDT	Special Marine Warning	JAX		2 hr
Apr 19, 1:25 PM EDT	Severe Thunderstorm Warning	JAX	Flagler, Marion, Putnam, Saint Johns	65 min
Apr 19, 1:36 PM EDT	Areal Flood Advisory	JAX	Marion	114 min
Apr 19, 2:09 PM EDT	Special Marine Warning	JAX		66 min
Apr 19, 2:27 PM EDT	Severe Thunderstorm Warning	JAX	Flagler	33 min
Apr 19, 3:12 PM EDT	Special Weather Statement	JAX	Alachua, Baker, Columbia, Gilchrist, Hamilton, Suwannee and 1 more	78 min
Apr 19, 3:16 PM EDT	Special Marine Warning	JAX		54 min
Apr 19, 4:32 PM EDT	Special Weather Statement	JAX	Alachua, Baker, Bradford, Clay, Columbia, Marion and 3 more	88 min
Apr 19, 5:55 PM EDT	Special Weather Statement	JAX	Clay, Duval, Flagler, Nassau, Putnam, Saint Johns	65 min
Apr 19, 9:47 AM EDT	Special Weather Statement	JAX	Atkinson, Bacon, Coffee, Jeff Davis	58 min
Apr 19, 10:01 AM EDT	Severe Thunderstorm Warning	JAX	Atkinson, Clinch, Coffee	44 min
Apr 19, 10:35 AM EDT	Severe Thunderstorm Warning	JAX	Appling, Bacon, Charlton, Clinch, Jeff Davis, Pierce and 1 more	55 min
Apr 19, 10:45 AM EDT	Severe Thunderstorm Warning	JAX	Atkinson, Coffee	16 min
Apr 19, 10:51 AM EDT	Tornado Warning	JAX	Appling, Jeff Davis	24 min
Apr 19, 11:12 AM EDT	Severe Thunderstorm Warning	JAX	Appling, Brantley, Charlton, Pierce, Ware, Wayne	48 min
Apr 19, 12:01 PM EDT	Severe Thunderstorm Warning	JAX	Brantley, Charlton, Wayne	29 min
Apr 19, 12:10 PM EDT	Tornado Warning	JAX	Camden, Glynn	29 min

Nearby

Severe Thunderstorm Warnings in Florida, 2019 Severe Thunderstorm Warnings in Georgia, 2019 Every severe thunderstorm warning in 2019

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.