Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 80, NWS Jacksonville, FL

June 9, 2021Nassau County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 9, 2021, 6:42 PM EDT for Nassau County, Florida. It was in force for 22 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 9, 2021, 6:42 PM EDT (22:42 UTC)
Expired: Jun 9, 2021, 7:04 PM EDT
In force: 22 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Nassau County, FL

The radar

The Jacksonville radar (KJAX), 20 km from the middle of the area, began a volume at 22:45 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, 10.7 hours before the alert went out and 19 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: 942 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 725 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

283 
WUUS52 KJAX 092242
SVRJAX
FLC089-092330-
/O.NEW.KJAX.SV.W.0080.210609T2242Z-210609T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
642 PM EDT Wed Jun 9 2021

The National Weather Service in Jacksonville has issued a

* Severe Thunderstorm Warning for...
  West central Nassau County in northeastern Florida...

* Until 730 PM EDT.

* At 642 PM EDT, a severe thunderstorm was located near Callahan, and
  is nearly stationary.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Callahan, Ratliff and Nassau Village-Ratliff. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3054 8198 3062 8192 3055 8175 3047 8185
TIME...MOT...LOC 2242Z 246DEG 1KT 3055 8191 

HAIL...<.75IN
WIND...60MPH
 
$$

ENYEDI

1 follow-up statement

114 
WWUS52 KJAX 092304
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
704 PM EDT Wed Jun 9 2021

FLC089-092313-
/O.CAN.KJAX.SV.W.0080.000000T0000Z-210609T2330Z/
Nassau FL-
704 PM EDT Wed Jun 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL NASSAU 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 heavy rain is
still possible with this thunderstorm.

LAT...LON 3054 8198 3062 8192 3055 8175 3047 8185
TIME...MOT...LOC 2259Z 246DEG 1KT 3055 8190 

$$

ENYEDI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 10:08 PM EDT	Special Weather Statement	JAX	Marion	52 min
Jun 8, 11:38 PM EDT	Special Weather Statement	JAX	Baker	37 min
Jun 9, 2:52 PM EDT	Special Weather Statement	JAX	Suwannee	23 min
Jun 9, 3:07 PM EDT	Special Weather Statement	JAX	Gilchrist	53 min
Jun 9, 3:18 PM EDT	Special Weather Statement	JAX	Suwannee	42 min
Jun 9, 3:46 PM EDT	Special Weather Statement	JAX	Hamilton	44 min
Jun 9, 4:22 PM EDT	Special Weather Statement	JAX	Union	23 min
Jun 9, 4:53 PM EDT	Special Weather Statement	JAX	Baker	52 min
Jun 9, 5:07 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Columbia	23 min
Jun 9, 5:27 PM EDT	Special Weather Statement	JAX	Baker	48 min
Jun 9, 5:47 PM EDT	Special Weather Statement	JAX	Duval	28 min
Jun 9, 6:11 PM EDT	Special Weather Statement	JAX	Suwannee	34 min
Jun 9, 6:34 PM EDT	Special Weather Statement	JAX	Nassau	41 min
Jun 9, 7:01 PM EDT	Special Weather Statement	JAX	Suwannee	29 min
Jun 9, 7:20 PM EDT	Severe Thunderstorm Warning	JAX	Suwannee	25 min
Jun 9, 7:37 PM EDT	Special Weather Statement	JAX	Suwannee	38 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.