Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 112, NWS Jacksonville, FL

June 15, 2021Clay County, Duval County, Nassau County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 15, 2021, 5:30 PM EDT for Clay County, Duval County, Nassau County, Florida. It was in force for 45 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 15, 2021, 5:30 PM EDT (21:30 UTC)
Expired: Jun 15, 2021, 6:15 PM EDT
In force: 45 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clay County, FL, Duval County, FL, Nassau County, FL

The radar

The Jacksonville radar (KJAX), 5 km from the middle of the area, began a volume at 21:30 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, 9.5 hours before the alert went out and 7 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: 3840 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 1021 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

273 
WUUS52 KJAX 152130 RRA
SVRJAX
FLC019-031-089-152215-
/O.NEW.KJAX.SV.W.0112.210615T2130Z-210615T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
530 PM EDT Tue Jun 15 2021

The National Weather Service in Jacksonville has issued a

* Severe Thunderstorm Warning for...
  Central Nassau County in northeastern Florida...
  Northeastern Clay County in northeastern Florida...
  Central Duval County in northeastern Florida...

* Until 615 PM EDT.

* At 530 PM EDT, severe thunderstorms were located along a line
  extending from Yulee to near Cecil Field, moving southeast at 20
  mph toward the Jacksonville Metro.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Jacksonville, Callahan, Jacksonville International Arpt, Arlington,
  Cisco Gardens, Ortega, Nassau Village-Ratliff, Ratliff, Oceanway
  and Normandy.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3015 8179 3033 8191 3063 8186 3064 8164
      3058 8160 3055 8139 3053 8139
TIME...MOT...LOC 2130Z 295DEG 18KT 3063 8158 3024 8192 

HAIL...1.00IN
WIND...60MPH
 
$$

BOOTHE

1 follow-up statement

843 
WWUS52 KJAX 152213
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
613 PM EDT Tue Jun 15 2021

FLC019-031-089-152223-
/O.EXP.KJAX.SV.W.0112.000000T0000Z-210615T2215Z/
Nassau FL-Clay FL-Duval FL-
613 PM EDT Tue Jun 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL NASSAU...NORTHEASTERN
CLAY AND CENTRAL DUVAL COUNTIES WILL EXPIRE AT 615 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with these thunderstorms.

LAT...LON 3015 8179 3033 8191 3063 8186 3064 8164
      3058 8160 3055 8139 3053 8139
TIME...MOT...LOC 2213Z 295DEG 18KT 3054 8135 3015 8170 

$$

23

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 15, 2:42 AM EDT	Small Craft Advisory	JAX		25 hr
Jun 15, 9:00 AM EDT	Special Weather Statement	JAX	Marion	45 min
Jun 15, 2:04 PM EDT	Special Weather Statement	JAX	Marion	41 min
Jun 15, 2:17 PM EDT	Severe Thunderstorm Warning	JAX	Marion	22 min
Jun 15, 2:32 PM EDT	Special Weather Statement	JAX	Suwannee	43 min
Jun 15, 2:36 PM EDT	Special Weather Statement	JAX	Flagler	39 min
Jun 15, 3:00 PM EDT	Severe Thunderstorm Warning	JAX	Suwannee	30 min
Jun 15, 3:10 PM EDT	Special Weather Statement	JAX	Columbia	50 min
Jun 15, 3:30 PM EDT	Severe Thunderstorm Warning	JAX	Columbia, Suwannee, Union	45 min
Jun 15, 3:33 PM EDT	Special Marine Warning	JAX		57 min
Jun 15, 3:39 PM EDT	Special Weather Statement	JAX	Bradford	51 min
Jun 15, 3:43 PM EDT	Special Weather Statement	JAX	Baker	47 min
Jun 15, 3:49 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Bradford, Union	41 min
Jun 15, 3:55 PM EDT	Special Marine Warning	JAX		65 min
Jun 15, 3:56 PM EDT	Special Weather Statement	JAX	Saint Johns	34 min
Jun 15, 3:59 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Clay	46 min
Jun 15, 4:02 PM EDT	Special Weather Statement	JAX	Clay	43 min
Jun 15, 4:14 PM EDT	Special Weather Statement	JAX	Hamilton	46 min
Jun 15, 4:15 PM EDT	Severe Thunderstorm Warning	JAX	Bradford, Clay, Duval, Putnam	45 min
Jun 15, 4:18 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Columbia, Hamilton	27 min
Jun 15, 4:19 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Union	41 min
Jun 15, 4:21 PM EDT	Special Marine Warning	JAX		39 min
Jun 15, 4:26 PM EDT	Special Marine Warning	JAX		49 min
Jun 15, 4:33 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Nassau	27 min
Jun 15, 4:36 PM EDT	Special Weather Statement	JAX	Nassau	54 min
Jun 15, 4:40 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Columbia, Hamilton	50 min
Jun 15, 4:45 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Clay, Putnam	45 min
Jun 15, 4:47 PM EDT	Severe Thunderstorm Warning	JAX	Hamilton, Suwannee	43 min
Jun 15, 4:50 PM EDT	Special Marine Warning	JAX		55 min
Jun 15, 4:54 PM EDT	Special Weather Statement	JAX	Duval	51 min
Jun 15, 4:54 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	36 min
Jun 15, 4:59 PM EDT	Special Marine Warning	JAX		61 min
Jun 15, 5:07 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval, Saint Johns	23 min
Jun 15, 5:09 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Duval, Nassau	22 min
Jun 15, 5:10 PM EDT	Special Marine Warning	JAX		95 min
Jun 15, 5:12 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	48 min
Jun 15, 5:15 PM EDT	Severe Thunderstorm Warning	JAX	Alachua	30 min
Jun 15, 5:26 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Bradford, Clay, Columbia, Duval, Nassau and 1 more	49 min
Jun 15, 5:29 PM EDT	Areal Flood Warning	JAX	Alachua, Bradford	2 hr
Jun 15, 5:30 PM EDT	Severe Thunderstorm Warning	JAX	Columbia, Hamilton, Suwannee	30 min
Jun 15, 5:35 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Clay, Putnam	25 min
Jun 15, 5:36 PM EDT	Severe Thunderstorm Warning	JAX	Duval, Saint Johns	24 min
Jun 15, 5:46 PM EDT	Severe Thunderstorm Warning	JAX	Flagler, Putnam, Saint Johns	44 min
Jun 15, 5:47 PM EDT	Special Marine Warning	JAX		58 min
Jun 15, 5:48 PM EDT	Special Weather Statement	JAX	Alachua	42 min
Jun 15, 5:54 PM EDT	Severe Thunderstorm Warning	JAX	Hamilton, Suwannee	51 min
Jun 15, 5:57 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Marion, Putnam	48 min
Jun 15, 6:01 PM EDT	Severe Thunderstorm Warning	JAX	Duval, Saint Johns	44 min
Jun 15, 6:07 PM EDT	Special Weather Statement	JAX	Alachua	23 min
Jun 15, 6:17 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Columbia, Hamilton, Union	43 min
Jun 15, 6:19 PM EDT	Special Weather Statement	JAX	Union	41 min
Jun 15, 6:26 PM EDT	Special Marine Warning	JAX		94 min
Jun 15, 6:33 PM EDT	Special Weather Statement	JAX	Columbia	27 min
Jun 15, 6:40 PM EDT	Special Weather Statement	JAX	Flagler	50 min
Jun 15, 6:46 PM EDT	Special Weather Statement	JAX	Marion	44 min
Jun 15, 6:48 PM EDT	Special Weather Statement	JAX	Gilchrist	42 min
Jun 15, 6:53 PM EDT	Special Marine Warning	JAX		97 min
Jun 15, 7:03 PM EDT	Special Weather Statement	JAX	Union	42 min
Jun 15, 7:12 PM EDT	Special Weather Statement	JAX	Gilchrist	48 min
Jun 15, 7:26 PM EDT	Areal Flood Warning	JAX	Alachua, Marion	2 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.