Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

June 20, 2021Bradford County, Florida

NWS Jacksonville, FL issued this special weather statement at Jun 20, 2021, 9:21 AM EDT for Bradford County, Florida. It was in force for 39 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: Jun 20, 2021, 9:21 AM EDT (13:21 UTC)
Expired: Jun 20, 2021, 10:00 AM EDT
In force: 39 min
Issued by: NWS Jacksonville, FL

County Bradford County, FL

The radar

The Jacksonville radar (KJAX), 81 km from the middle of the area, began a volume at 13:23 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 12:00Z, 1.4 hours before the alert went out and 82 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: 1078 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 938 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 9.6

Open this sounding in Storm Lab

The text

As transmitted.

116 
WWUS82 KJAX 201321
SPSJAX

Special Weather Statement
National Weather Service Jacksonville FL
921 AM EDT Sun Jun 20 2021
 
FLZ031-136-232-236-201400-
Eastern Alachua FL-Western Alachua FL-Western Clay FL-Bradford FL-
921 AM EDT Sun Jun 20 2021

...SIGNIFICANT WEATHER ADVISORY FOR BRADFORD...NORTHERN ALACHUA AND
NORTHWESTERN CLAY COUNTIES UNTIL 1000 AM EDT...

* At 921 AM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm over Sampson, or 8 miles southwest
  of Starke, moving northeast at 15 mph.

* Wind gusts up to 40 to 50 mph, funnel clouds, and minor flooding 
  due to heavy rainfall is possible with this storm.

* Locations impacted include...
  Starke, Middleburg, Alachua, Kingsley, New River, Sampson, Camp
  Blanding, Waldo, Lawtey and Hampton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

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

Funnel clouds occasionally touch down and produce tornadoes or
waterspouts. Move indoors and stay away from windows.

&&

LAT...LON 2993 8238 2993 8236 2996 8234 2996 8231
      3001 8227 3013 8210 3017 8183 2991 8188
      2968 8254 2979 8258
TIME...MOT...LOC 1321Z 236DEG 14KT 2988 8223 

$$

HESS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 8:55 PM EDT	Special Weather Statement	JAX	Duval	35 min
Jun 19, 9:26 PM EDT	Special Weather Statement	JAX	Saint Johns	49 min
Jun 19, 10:09 PM EDT	Special Marine Warning	JAX		51 min
Jun 19, 10:37 PM EDT	Special Marine Warning	JAX		53 min
Jun 20, 2:11 AM EDT	Small Craft Advisory	JAX		25 hr
Jun 20, 5:08 AM EDT	Special Weather Statement	JAX	Hamilton	37 min
Jun 20, 6:15 AM EDT	Special Weather Statement	JAX	Columbia, Hamilton, Suwannee	45 min
Jun 20, 7:30 AM EDT	Special Weather Statement	JAX	Baker	45 min
Jun 20, 9:34 AM EDT	Special Weather Statement	JAX	Gilchrist	41 min
Jun 20, 10:04 AM EDT	Special Weather Statement	JAX	Duval	41 min
Jun 20, 10:14 AM EDT	Special Weather Statement	JAX	Alachua	46 min
Jun 20, 10:36 AM EDT	Severe Thunderstorm Warning	JAX	Alachua, Marion	39 min
Jun 20, 11:05 AM EDT	Areal Flood Warning	JAX	Alachua, Marion	85 min
Jun 20, 11:15 AM EDT	Special Weather Statement	JAX	Alachua, Bradford	45 min
Jun 20, 11:45 AM EDT	Special Weather Statement	JAX	Putnam	45 min
Jun 20, 11:57 AM EDT	Special Weather Statement	JAX	Bradford, Clay	48 min
Jun 20, 12:02 PM EDT	Special Weather Statement	JAX	Putnam	43 min
Jun 20, 12:21 PM EDT	Special Weather Statement	JAX	Gilchrist	39 min
Jun 20, 1:19 PM EDT	Special Weather Statement	JAX	Putnam	41 min
Jun 20, 1:38 PM EDT	Tornado Warning	JAX	Putnam, Saint Johns	37 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.