Alert archive / Georgia / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

August 20, 2021Brantley County, Georgia

NWS Jacksonville, FL issued this special weather statement at Aug 20, 2021, 7:59 PM EDT for Brantley County, Georgia. It was in force for 31 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 20, 2021, 7:59 PM EDT (23:59 UTC)
Expired: Aug 20, 2021, 8:30 PM EDT
In force: 31 min
Issued by: NWS Jacksonville, FL
Hail: 0.00 in
Wind: 50

County Brantley County, GA

The radar

The Jacksonville radar (KJAX), 73 km from the middle of the area, began a volume at 00:00 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, 12.0 hours before the alert went out and 71 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: 1224 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 1047 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before this special weather statement went out at Aug 20, 4:07 PM EDT, 3 hours 52 minutes earlier.

Area forecast discussion, Aug 20, 4:07 PM EDT, 3 hours 52 minutes before

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In the hours before

Special weather statement, Aug 20, 3:09 PM EDT, 4 hours 50 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
309 PM EDT Fri Aug 20 2021

FLZ340-201945-
Western Marion FL-
309 PM EDT Fri Aug 20 2021

...A strong thunderstorm will impact portions of southwestern Marion
County through 345 PM EDT...

At 309 PM EDT, Doppler radar was tracking a strong thunderstorm near
Rainbow Lakes Estates, moving south at 10 mph.

HAZARD...Winds in excess of 40 mph, excessive cloud-to-ground
         lightning, and minor flooding due to heavy rainfall.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Excessive cloud-to-ground lightning is
         occurring. Minor flooding due to heavy rainfall is
         possible.

Locations impacted include...
Dunnellon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2897 8232 2899 8235 2901 8239 2902 8240
      2902 8242 2905 8247 2905 8249 2904 8250
      2904 8253 2919 8254 2896 8226 2896 8231
TIME...MOT...LOC 1909Z 001DEG 9KT 2907 8250

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

HESS

Special weather statement, Aug 20, 3:38 PM EDT, 4 hours 21 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
338 PM EDT Fri Aug 20 2021

FLZ023-030-031-033-125-132-133-225-232-325-425-202015-
Eastern Clay FL-Coastal St. Johns FL-Baker FL-Western Clay FL-
Union FL-Western Duval FL-South Central Duval FL-Trout River FL-
Bradford FL-Coastal Duval FL-Inland St. Johns FL-
338 PM EDT Fri Aug 20 2021

...Strong thunderstorms will impact portions of northeastern
Bradford, northwestern St. Johns, southeastern Baker, northeastern
Union, northern Clay and southern Duval Counties through 415 PM
EDT...

At 337 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Normandy to near Glen St. Mary. Movement
was southeast at 15 mph.

HAZARD...Winds in excess of 40 mph and minor flooding due to heavy
         rainfall.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor flooding due to heavy rainfall is
         possible.

Locations impacted include...
Jacksonville, Orange Park, Mandarin, Fruit Cove, Arlington,
Middleburg, Macclenny, Baymeadows, Cisco Gardens and Ortega.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3015 8135 2992 8206 3023 8221 3030 8205
      3027 8205 3032 8200 3043 8172
TIME...MOT...LOC 1937Z 319DEG 12KT 3034 8178 3021 8214

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

HESS

Local storm report, Aug 20, 3:48 PM EDT, 4 hours 11 minutes before

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Special weather statement, Aug 20, 7:11 PM EDT, 48 minutes before

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Special weather statement, Aug 20, 7:31 PM EDT, 28 minutes before

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Special weather statement, Aug 20, 7:59 PM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 8:28 PM EDT	Special Weather Statement	JAX	Hamilton	47 min
Aug 19, 9:09 PM EDT	Areal Flood Warning	JAX	Hamilton	96 min
Aug 20, 3:09 PM EDT	Special Weather Statement	JAX	Citrus	36 min
Aug 20, 3:38 PM EDT	Special Weather Statement	JAX	Clay, Duval	37 min
Aug 20, 1:38 PM EDT	Special Weather Statement	JAX	Ware	52 min
Aug 20, 2:20 PM EDT	Special Weather Statement	JAX	Charlton	40 min
Aug 20, 7:11 PM EDT	Special Weather Statement	JAX	Ware	34 min
Aug 20, 7:31 PM EDT	Special Weather Statement	JAX	Pierce	29 min

Nearby

Special Weather Statements in Georgia, 2021 Every special weather statement 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.