Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

August 11, 2021Hamilton County, Florida

NWS Jacksonville, FL issued this special weather statement at Aug 11, 2021, 9:45 PM EDT for Hamilton County, Florida. It was in force for 30 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 11, 2021, 9:45 PM EDT (01:45 UTC)
Expired: Aug 11, 2021, 10:15 PM EDT
In force: 30 min
Issued by: NWS Jacksonville, FL
Hail: 0.25 in
Wind: 50

County Hamilton County, FL

The radar

The Moody AFB radar (KVAX), 47 km from the middle of the area, began a volume at 01:46 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 00:00Z, 1.8 hours before the alert went out and 146 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: 2619 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 1031 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 57 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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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 8:26 PM EDT	Special Weather Statement	JAX	Gilchrist	34 min
Aug 11, 9:16 PM EDT	Special Weather Statement	JAX	Hamilton	29 min
Aug 11, 10:26 PM EDT	Special Weather Statement	JAX	Suwannee	49 min
Aug 11, 10:30 PM EDT	Special Weather Statement	JAX	Hamilton	45 min
Aug 11, 10:41 PM EDT	Special Weather Statement	JAX	Suwannee	49 min
Aug 11, 10:59 PM EDT	Special Weather Statement	JAX	Suwannee	46 min
Aug 11, 11:23 PM EDT	Areal Flood Warning	JAX	Hamilton, Suwannee	3 hr
Aug 11, 11:40 PM EDT	Special Weather Statement	JAX	Hamilton	50 min
Aug 12, 12:04 AM EDT	Special Weather Statement	JAX	Hamilton	41 min
Aug 12, 2:10 PM EDT	Special Weather Statement	JAX	Saint Johns	35 min
Aug 12, 2:27 PM EDT	Special Weather Statement	JAX	Marion	33 min
Aug 12, 2:32 PM EDT	Special Weather Statement	JAX	Clay	28 min
Aug 12, 2:41 PM EDT	Special Weather Statement	JAX	Marion	34 min
Aug 12, 3:03 PM EDT	Special Weather Statement	JAX	Marion	42 min
Aug 12, 3:09 PM EDT	Special Weather Statement	JAX	Duval	36 min
Aug 12, 3:44 PM EDT	Special Weather Statement	JAX	Marion	31 min
Aug 12, 5:09 PM EDT	Special Weather Statement	JAX	Suwannee	36 min
Aug 12, 6:29 PM EDT	Special Weather Statement	JAX	Gilchrist	31 min
Aug 12, 6:48 PM EDT	Special Weather Statement	JAX	Columbia	27 min
Aug 12, 7:15 PM EDT	Special Weather Statement	JAX	Suwannee	30 min
Aug 12, 12:55 AM EDT	Special Weather Statement	JAX	Clinch	50 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.