Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

August 23, 2021Marion County, Florida

NWS Jacksonville, FL issued this special weather statement at Aug 23, 2021, 2:15 PM EDT for Marion 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 23, 2021, 2:15 PM EDT (18:15 UTC)
Expired: Aug 23, 2021, 2:45 PM EDT
In force: 30 min
Issued by: NWS Jacksonville, FL
Hail: 0.00 in
Wind: 40

County Marion County, FL

The radar

The Jacksonville radar (KJAX), 149 km from the middle of the area, began a volume at 18:17 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, 6.3 hours before the alert went out and 142 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: 1015 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1056 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: -6 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 23, 2:03 PM EDT, 12 minutes earlier.

Area forecast discussion, Aug 23, 2:03 PM EDT, 12 minutes before

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In the hours before

Special weather statement, Aug 23, 1:25 PM EDT, 50 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
125 PM EDT Mon Aug 23 2021

FLZ023-024-124-125-225-325-425-GAZ165-364-231815-
Baker FL-Western Duval FL-South Central Duval FL-Inland Nassau FL-
Trout River FL-Coastal Nassau FL-Coastal Duval FL-Inland Camden GA-
Western Charlton GA-
125 PM EDT Mon Aug 23 2021

...A strong thunderstorm will impact portions of Nassau, northeastern
Baker, central Duval, southern Camden and southeastern Charlton
Counties through 215 PM EDT...

At 125 PM EDT, Doppler radar was tracking a strong thunderstorm 8
miles east of Taylor, or 20 miles southwest of Callahan, moving east
at 25 mph.

HAZARD...Wind gusts of 45 to 55 mph and minor flooding due to heavy
         rainfall.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor flooding due to heavy rainfall is
         possible.

Locations impacted include...
Jacksonville, Hilliard, Callahan, Jacksonville International Arpt,
Macclenny, Cisco Gardens, St. George, Bryceville, Nassau
Village-Ratliff and Ratliff.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3029 8166 3028 8224 3057 8226 3057 8222
      3063 8219 3077 8169 3074 8169 3074 8167
      3075 8167 3075 8165 3073 8165 3073 8164
TIME...MOT...LOC 1725Z 266DEG 24KT 3043 8215

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

NELSON

Special weather statement, Aug 23, 2:04 PM EDT, 11 minutes before

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Special weather statement, Aug 23, 2:06 PM EDT, 9 minutes before

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Local storm report, Aug 23, 2:12 PM EDT, 3 minutes before

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Special weather statement, Aug 23, 2:14 PM EDT, 1 minute before

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Special weather statement, Aug 23, 2:15 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 23, 12:57 PM EDT	Special Weather Statement	JAX	Baker	48 min
Aug 23, 1:25 PM EDT	Special Weather Statement	JAX	Nassau	50 min
Aug 23, 1:39 PM EDT	Severe Thunderstorm Warning	JAX	Duval, Nassau	36 min
Aug 23, 1:42 PM EDT	Special Marine Warning	JAX		93 min
Aug 23, 2:06 PM EDT	Special Weather Statement	JAX	Duval, Nassau	39 min
Aug 23, 2:14 PM EDT	Special Weather Statement	JAX	Clay	46 min
Aug 23, 2:32 PM EDT	Special Weather Statement	JAX	Nassau	28 min
Aug 23, 2:48 PM EDT	Special Weather Statement	JAX	Marion	27 min
Aug 23, 3:03 PM EDT	Special Marine Warning	JAX		87 min
Aug 23, 2:04 PM EDT	Special Weather Statement	JAX	Camden	26 min
Aug 23, 3:07 PM EDT	Special Weather Statement	JAX	Glynn	23 min
Aug 23, 3:21 PM EDT	Special Weather Statement	JAX	Brantley	39 min
Aug 23, 3:32 PM EDT	Special Weather Statement	JAX	Glynn	28 min
Aug 23, 3:51 PM EDT	Areal Flood Warning	JAX	Glynn	84 min
Aug 23, 4:09 PM EDT	Special Weather Statement	JAX	Wayne	36 min
Aug 23, 4:47 PM EDT	Special Weather Statement	JAX	Wayne	58 min
Aug 23, 5:07 PM EDT	Areal Flood Warning	JAX	Wayne	113 min
Aug 23, 5:31 PM EDT	Special Weather Statement	JAX	Coffee	29 min
Aug 23, 6:12 PM EDT	Special Weather Statement	JAX	Coffee	63 min
Aug 23, 6:46 PM EDT	Areal Flood Warning	JAX	Coffee	119 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.