Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 152, NWS Jacksonville, FL

August 24, 2021Alachua County, Bradford County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 24, 2021, 2:09 PM EDT for Alachua County, Bradford County, Florida. It was in force for 36 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 24, 2021, 2:09 PM EDT (18:09 UTC)
Expired: Aug 24, 2021, 2:45 PM EDT
In force: 36 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Alachua County, FL, Bradford County, FL

The radar

The Jacksonville radar (KJAX), 97 km from the middle of the area, began a volume at 18:13 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, 6.2 hours before the alert went out and 98 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: 1528 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 869 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: -40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

175 
WUUS52 KJAX 241809
SVRJAX
FLC001-007-241845-
/O.NEW.KJAX.SV.W.0152.210824T1809Z-210824T1845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
209 PM EDT Tue Aug 24 2021

The National Weather Service in Jacksonville has issued a

* Severe Thunderstorm Warning for...
  Southeastern Bradford County in northern Florida...
  Northeastern Alachua County in northern Florida...

* Until 245 PM EDT.

* At 209 PM EDT, a severe thunderstorm was located near Gainesville
  Airport, or near Gainesville, moving north 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...
  Gainesville, Keystone Heights, Gainesville Airport, Newnans Lake,
  Waldo and Hampton.

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.

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

&&

LAT...LON 2963 8224 2969 8237 2995 8231 2985 8205
TIME...MOT...LOC 1809Z 191DEG 13KT 2976 8227 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BOOTHE

1 follow-up statement

965 
WWUS52 KJAX 241835
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
235 PM EDT Tue Aug 24 2021

FLC001-007-241845-
/O.EXP.KJAX.SV.W.0152.000000T0000Z-210824T1845Z/
Bradford FL-Alachua FL-
235 PM EDT Tue Aug 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BRADFORD AND
NORTHEASTERN ALACHUA COUNTIES WILL EXPIRE AT 245 PM EDT...
                
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 will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 2963 8224 2969 8237 2995 8231 2985 8205
TIME...MOT...LOC 1835Z 191DEG 13KT 2984 8225 

$$

BOOTHE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 2:03 PM EDT	Special Weather Statement	JAX	Alachua	42 min
Aug 24, 2:27 PM EDT	Special Weather Statement	JAX	Duval	33 min
Aug 24, 3:02 PM EDT	Special Weather Statement	JAX	Duval	43 min
Aug 24, 3:10 PM EDT	Special Weather Statement	JAX	Citrus	35 min
Aug 24, 3:14 PM EDT	Special Weather Statement	JAX	Clay	46 min
Aug 24, 3:25 PM EDT	Special Weather Statement	JAX	Clay	35 min
Aug 24, 3:28 PM EDT	Severe Thunderstorm Warning	JAX	Clay	32 min
Aug 24, 3:36 PM EDT	Special Weather Statement	JAX	Duval	24 min
Aug 24, 3:43 PM EDT	Special Weather Statement	JAX	Putnam	47 min
Aug 24, 3:49 PM EDT	Special Weather Statement	JAX	Columbia	41 min
Aug 24, 3:53 PM EDT	Special Weather Statement	JAX	Suwannee	37 min
Aug 24, 4:06 PM EDT	Special Weather Statement	JAX	Duval	24 min
Aug 24, 4:10 PM EDT	Special Weather Statement	JAX	Marion	35 min
Aug 24, 4:15 PM EDT	Special Weather Statement	JAX	Saint Johns	45 min
Aug 24, 4:38 PM EDT	Special Weather Statement	JAX	Marion, Putnam	52 min
Aug 24, 4:43 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Marion	32 min
Aug 24, 4:48 PM EDT	Special Weather Statement	JAX	Saint Johns	57 min
Aug 24, 5:00 PM EDT	Special Marine Warning	JAX		60 min
Aug 24, 5:26 PM EDT	Special Weather Statement	JAX	Marion	34 min
Aug 24, 5:47 PM EDT	Special Weather Statement	JAX	Flagler	43 min
Aug 24, 5:54 PM EDT	Special Marine Warning	JAX		49 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.