Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

August 20, 2021Saint Johns County, Florida

NWS Jacksonville, FL issued this special weather statement at Aug 20, 2021, 10:55 PM EDT for 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 outline as issued.

The facts

Issued: Aug 20, 2021, 10:55 PM EDT (02:55 UTC)
Expired: Aug 20, 2021, 11:30 PM EDT
In force: 35 min
Issued by: NWS Jacksonville, FL
Hail: 0.25 in
Wind: 50

County Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 70 km from the middle of the area, began a volume at 02:54 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

Jacksonville, FL (KJAX), launched 00:00Z, 2.9 hours before the alert went out and 71 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: 735 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1521 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 20, 9:02 PM EDT, 1 hour 53 minutes earlier.

Area forecast discussion, Aug 20, 9:02 PM EDT, 1 hour 53 minutes before

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In the hours before

Local storm report, Aug 20, 8:47 PM EDT, 2 hours 8 minutes before

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Special weather statement, Aug 20, 9:03 PM EDT, 1 hour 52 minutes before

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Special weather statement, Aug 20, 9:29 PM EDT, 1 hour 26 minutes before

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Special weather statement, Aug 20, 9:44 PM EDT, 1 hour 11 minutes before

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Special weather statement, Aug 20, 9:56 PM EDT, 59 minutes before

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Special weather statement, Aug 20, 10:55 PM EDT, 0 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
Aug 20, 8:35 PM EDT	Special Weather Statement	JAX	Nassau	40 min
Aug 20, 8:51 PM EDT	Special Marine Warning	JAX		114 min
Aug 20, 9:03 PM EDT	Special Weather Statement	JAX	Nassau	42 min
Aug 20, 9:29 PM EDT	Special Weather Statement	JAX	Clay	31 min
Aug 20, 9:44 PM EDT	Special Weather Statement	JAX	Nassau	31 min
Aug 20, 9:56 PM EDT	Special Weather Statement	JAX	Clay	34 min
Aug 20, 10:25 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Saint Johns	35 min
Aug 20, 10:47 PM EDT	Special Marine Warning	JAX		58 min
Aug 20, 11:08 PM EDT	Special Marine Warning	JAX		67 min
Aug 20, 11:20 PM EDT	Special Marine Warning	JAX		55 min
Aug 20, 11:43 PM EDT	Special Marine Warning	JAX		47 min
Aug 20, 8:08 PM EDT	Special Weather Statement	JAX	Brantley	37 min
Aug 20, 8:44 PM EDT	Special Weather Statement	JAX	Brantley, Glynn	46 min

Nearby

Special Weather Statements in Florida, 2021 Every special weather statement in 2021

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.