Alert archive / Georgia / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

August 18, 2021Pierce County, Georgia

NWS Jacksonville, FL issued this special weather statement at Aug 18, 2021, 6:55 PM EDT for Pierce County, Georgia. It was in force for 65 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 18, 2021, 6:55 PM EDT (22:55 UTC)
Expired: Aug 18, 2021, 8:00 PM EDT
In force: 65 min
Issued by: NWS Jacksonville, FL
Hail: 0.00 in
Wind: 30

County Pierce County, GA

The radar

The Moody AFB radar (KVAX), 70 km from the middle of the area, began a volume at 22:57 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, 10.9 hours before the alert went out and 102 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: 1778 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 796 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: -32 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 18, 4:30 PM EDT, 2 hours 25 minutes earlier.

Area forecast discussion, Aug 18, 4:30 PM EDT, 2 hours 25 minutes before

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In the hours before

Special weather statement, Aug 18, 1:32 PM EDT, 5 hours 23 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
132 PM EDT Wed Aug 18 2021

FLZ124-125-GAZ166-181800-
Coastal Nassau FL-Coastal Duval FL-Coastal Camden GA-
132 PM EDT Wed Aug 18 2021

...A strong thunderstorm will impact portions of northeastern Nassau,
north central Duval and south central Camden Counties through 200 PM
EDT...

At 132 PM EDT, Doppler radar was tracking a strong thunderstorm over
Yulee, or near Fernandina Beach. This storm was nearly stationary.

HAZARD...Minor flooding due to heavy rainfall.

SOURCE...Radar indicated.

IMPACT...Minor flooding due to heavy rainfall is possible.

Locations impacted include...
St. Marys and Yulee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3054 8154 3056 8164 3075 8163 3075 8149
TIME...MOT...LOC 1732Z 174DEG 2KT 3065 8155

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...<30 MPH

HESS

Special weather statement, Aug 18, 2:57 PM EDT, 3 hours 58 minutes before

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Special weather statement, Aug 18, 3:58 PM EDT, 2 hours 57 minutes before

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Special weather statement, Aug 18, 6:37 PM EDT, 18 minutes before

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Special weather statement, Aug 18, 6:55 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 18, 1:32 PM EDT	Special Weather Statement	JAX	Nassau	28 min
Aug 18, 3:58 PM EDT	Special Weather Statement	JAX	Putnam	62 min
Aug 18, 6:37 PM EDT	Special Weather Statement	JAX	Baker	23 min
Aug 17, 9:29 PM EDT	Special Weather Statement	JAX	Coffee	46 min
Aug 18, 2:57 PM EDT	Special Weather Statement	JAX	Camden	63 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.