Alert archive / Georgia / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 178, NWS Jacksonville, FL

July 28, 2018Nassau County, Florida; Camden County, Charlton County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 28, 2018, 6:37 PM EDT for Nassau County, Florida; Camden County, Charlton County, Georgia. It was in force for 38 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: Jul 28, 2018, 6:37 PM EDT (22:37 UTC)
Expired: Jul 28, 2018, 7:15 PM EDT
In force: 38 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Nassau County, FL, Camden County, GA, Charlton County, GA

The radar

The Jacksonville radar (KJAX), 35 km from the middle of the area, began a volume at 22:40 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, 10.6 hours before the alert went out and 238 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: 1188 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 844 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: -17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 28, 3:23 PM EDT, 3 hours 14 minutes earlier.

Area forecast discussion, Jul 28, 3:23 PM EDT, 3 hours 14 minutes before

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In the hours before

Local storm report, Jul 28, 4:11 PM EDT, 2 hours 26 minutes before

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Special weather statement, Jul 28, 4:39 PM EDT, 1 hour 58 minutes before

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Special weather statement, Jul 28, 4:47 PM EDT, 1 hour 50 minutes before

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Special weather statement, Jul 28, 5:29 PM EDT, 1 hour 8 minutes before

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Special weather statement, Jul 28, 5:46 PM EDT, 51 minutes before

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Special weather statement, Jul 28, 6:31 PM EDT, 6 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
Jul 27, 8:01 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Clay, Duval, Nassau	44 min
Jul 27, 8:12 PM EDT	Areal Flood Advisory	JAX	Baker, Duval, Nassau	93 min
Jul 27, 8:24 PM EDT	Special Weather Statement	JAX	Duval	51 min
Jul 27, 8:32 PM EDT	Areal Flood Warning	JAX	Baker, Clay, Duval, Nassau	118 min
Jul 27, 8:42 PM EDT	Areal Flood Advisory	JAX	Duval, Nassau	93 min
Jul 27, 9:06 PM EDT	Areal Flood Advisory	JAX	Bradford, Clay	84 min
Jul 27, 9:19 PM EDT	Special Marine Warning	JAX		31 min
Jul 27, 9:23 PM EDT	Special Marine Warning	JAX		27 min
Jul 27, 9:41 PM EDT	Areal Flood Advisory	JAX	Union	94 min
Jul 27, 9:43 PM EDT	Areal Flood Advisory	JAX	Nassau	92 min
Jul 28, 2:51 PM EDT	Special Weather Statement	JAX	Flagler	24 min
Jul 28, 3:58 PM EDT	Special Weather Statement	JAX	Marion	17 min
Jul 28, 4:09 PM EDT	Special Weather Statement	JAX	Marion	21 min
Jul 28, 4:39 PM EDT	Special Weather Statement	JAX	Marion	21 min
Jul 28, 6:45 PM EDT	Special Weather Statement	JAX	Columbia	15 min
Jul 28, 6:51 PM EDT	Areal Flood Advisory	JAX	Nassau	84 min
Jul 28, 7:28 PM EDT	Special Weather Statement	JAX	Columbia	32 min
Jul 28, 7:55 PM EDT	Special Weather Statement	JAX	Columbia	20 min
Jul 27, 9:39 PM EDT	Areal Flood Advisory	JAX	Camden	66 min
Jul 28, 4:47 PM EDT	Special Weather Statement	JAX	Glynn	13 min
Jul 28, 5:29 PM EDT	Special Weather Statement	JAX	Camden	16 min
Jul 28, 5:46 PM EDT	Special Weather Statement	JAX	Camden	29 min
Jul 28, 6:31 PM EDT	Special Weather Statement	JAX	Charlton	29 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2018 Severe Thunderstorm Warnings in Florida, 2018 Every 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.