Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 154, NWS Jacksonville, FL

August 24, 2021Alachua County, Marion County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 24, 2021, 4:43 PM EDT for Alachua County, Marion County, Florida. It was in force for 32 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, 4:43 PM EDT (20:43 UTC)
Expired: Aug 24, 2021, 5:15 PM EDT
In force: 32 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Alachua County, FL, Marion County, FL

The radar

The Jacksonville radar (KJAX), 129 km from the middle of the area, began a volume at 20:44 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, 8.7 hours before the alert went out and 131 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.

429 
WUUS52 KJAX 242043
SVRJAX
FLC001-083-242115-
/O.NEW.KJAX.SV.W.0154.210824T2043Z-210824T2115Z/

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

The National Weather Service in Jacksonville has issued a

* Severe Thunderstorm Warning for...
  Southeastern Alachua County in northern Florida...
  North central Marion County in northern Florida...

* Until 515 PM EDT.

* At 443 PM EDT, a severe thunderstorm was located over Citra, moving
  north at 5 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Citra, Cross Creek, Reddick and McIntosh. 

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 2933 8214 2934 8225 2949 8228 2949 8206
TIME...MOT...LOC 2043Z 196DEG 6KT 2940 8216 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BOOTHE

1 follow-up statement

062 
WWUS52 KJAX 242105
SVSJAX

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

FLC001-083-242115-
/O.EXP.KJAX.SV.W.0154.000000T0000Z-210824T2115Z/
Alachua FL-Marion FL-
505 PM EDT Tue Aug 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ALACHUA AND NORTH
CENTRAL MARION COUNTIES WILL EXPIRE AT 515 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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Jacksonville.

LAT...LON 2933 8214 2934 8225 2949 8228 2949 8206
TIME...MOT...LOC 2105Z 196DEG 6KT 2944 8215 

$$

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, 2:09 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Bradford	36 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, 4:48 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.