Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 82, NWS Jacksonville, FL

June 12, 2021Duval County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 12, 2021, 2:59 PM EDT for Duval County, Florida. It was in force for 14 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 12, 2021, 2:59 PM EDT (18:59 UTC)
Expired: Jun 12, 2021, 3:13 PM EDT
In force: 14 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Duval County, FL

The radar

The Jacksonville radar (KJAX), 25 km from the middle of the area, began a volume at 19:01 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.

What was reported inside it

Time	Report	Where	Remark
Jun 12, 2:59 PM EDT	TSTM WND GST 46	4 Ne Orange Park, FL	AWOS STATION KNIP JACKSONVILLE NAS MEASURED A PEAK WIND GUST OF 46 MPH.
Jun 12, 3:10 PM EDT	TSTM WND GST 53	2 Wsw Arlington, FL	WIND GUST OF 53 MPH REPORTED AT TIAA STADIUM IN DOWNTOWN JACKSONVILLE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 7.0 hours before the alert went out and 27 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: 467 J/kg
Mixed-layer CIN: -102 J/kg
Mixed-layer LCL: 1010 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

327 
WUUS52 KJAX 121859
SVRJAX
FLC031-121930-
/O.NEW.KJAX.SV.W.0082.210612T1859Z-210612T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
259 PM EDT Sat Jun 12 2021

The National Weather Service in Jacksonville has issued a

* Severe Thunderstorm Warning for...
  Southeastern Duval County in northeastern Florida...

* Until 330 PM EDT.

* At 259 PM EDT, a severe thunderstorm was located over Ortega, or
  near Jacksonville, moving east at 15 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Jacksonville, Arlington, Nas Jax, Baymeadows, Ortega, Normandy, San
  Marco, Riverside and Tallyrand.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3020 8178 3031 8179 3041 8156 3018 8150
TIME...MOT...LOC 1859Z 262DEG 13KT 3026 8172 

HAIL...0.75IN
WIND...60MPH
 
$$

HESS

1 follow-up statement

613 
WWUS52 KJAX 121913
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
313 PM EDT Sat Jun 12 2021

FLC031-121923-
/O.CAN.KJAX.SV.W.0082.000000T0000Z-210612T1930Z/
Duval FL-
313 PM EDT Sat Jun 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DUVAL COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However small hail, gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3020 8178 3031 8179 3041 8156 3018 8150
TIME...MOT...LOC 1912Z 262DEG 13KT 3027 8166 

$$

HESS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 12:51 PM EDT	Special Weather Statement	JAX	Gilchrist	24 min
Jun 12, 1:22 PM EDT	Special Weather Statement	JAX	Alachua, Bradford, Clay, Gilchrist, Putnam, Union	38 min
Jun 12, 1:50 PM EDT	Special Weather Statement	JAX	Clay, Putnam	40 min
Jun 12, 1:59 PM EDT	Special Weather Statement	JAX	Suwannee	46 min
Jun 12, 2:11 PM EDT	Special Weather Statement	JAX	Bradford, Clay	49 min
Jun 12, 2:15 PM EDT	Special Marine Warning	JAX		90 min
Jun 12, 2:46 PM EDT	Special Weather Statement	JAX	Hamilton	44 min
Jun 12, 2:50 PM EDT	Special Weather Statement	JAX	Clay, Saint Johns	40 min
Jun 12, 2:51 PM EDT	Special Marine Warning	JAX		84 min
Jun 12, 2:53 PM EDT	Special Weather Statement	JAX	Columbia, Union	37 min
Jun 12, 3:22 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Columbia, Hamilton	53 min
Jun 12, 3:25 PM EDT	Special Weather Statement	JAX	Nassau	50 min
Jun 12, 3:27 PM EDT	Special Weather Statement	JAX	Suwannee	48 min
Jun 12, 3:33 PM EDT	Special Marine Warning	JAX		87 min
Jun 12, 4:10 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Columbia, Hamilton, Nassau, Union	25 min
Jun 12, 4:15 PM EDT	Special Weather Statement	JAX	Nassau	45 min
Jun 12, 5:26 PM EDT	Special Marine Warning	JAX		64 min

Nearby

Severe Thunderstorm Warnings in Florida, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.