Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

June 23, 2021Saint Johns County, Florida

NWS Jacksonville, FL issued this special weather statement at Jun 23, 2021, 2:50 PM EDT for Saint Johns County, Florida. It was in force for 40 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 23, 2021, 2:50 PM EDT (18:50 UTC)
Expired: Jun 23, 2021, 3:30 PM EDT
In force: 40 min
Issued by: NWS Jacksonville, FL

County Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 52 km from the middle of the area, began a volume at 18:51 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, 6.8 hours before the alert went out and 54 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: 1108 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 527 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 63 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 Jun 23, 10:14 AM EDT, 4 hours 36 minutes earlier.

Area forecast discussion, Jun 23, 10:14 AM EDT, 4 hours 36 minutes before

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In the hours before

Local storm report, Jun 23, 1:34 PM EDT, 1 hour 16 minutes before

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Special weather statement, Jun 23, 1:41 PM EDT, 1 hour 9 minutes before

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Special weather statement, Jun 23, 1:43 PM EDT, 1 hour 7 minutes before

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Special weather statement, Jun 23, 2:15 PM EDT, 35 minutes before

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Special weather statement, Jun 23, 2:31 PM EDT, 19 minutes before

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Special weather statement, Jun 23, 2:50 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
250 PM EDT Wed Jun 23 2021

FLZ033-132-133-232-325-231930-
Eastern Clay FL-Coastal St. Johns FL-Western Clay FL-
South Central Duval FL-Inland St. Johns FL-
250 PM EDT Wed Jun 23 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ST. JOHNS...
NORTHEASTERN CLAY AND SOUTHERN DUVAL COUNTIES UNTIL 330 PM EDT...

* At 250 PM EDT, National Weather Service meteorologists were
  tracking a thunderstorm over Switzerland, or near Green Cove
  Springs, moving southeast at 15 mph.

* Minor flooding due to heavy rainfall is possible with this storm.

* Locations impacted include...
  Green Cove Springs, Fruit Cove, World Golf Village, Fleming Island,
  Picolata, Switzerland, Durbin and Bakersville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Jacksonville on
Facebook and Twitter.

&&

LAT...LON 3001 8178 3015 8168 3006 8137 2986 8152
TIME...MOT...LOC 1850Z 296DEG 15KT 3005 8168

CHANEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 9:41 PM EDT	River Flood Warning	JAX	Alachua, Columbia	30 days
Jun 22, 9:41 PM EDT	River Flood Warning	JAX	Alachua, Union	24 days
Jun 22, 9:41 PM EDT	River Flood Warning	JAX	Columbia, Gilchrist	13 hr
Jun 23, 1:41 PM EDT	Special Weather Statement	JAX	Marion	49 min
Jun 23, 1:43 PM EDT	Special Weather Statement	JAX	Flagler	32 min
Jun 23, 2:15 PM EDT	Special Weather Statement	JAX	Duval	45 min
Jun 23, 2:31 PM EDT	Special Weather Statement	JAX	Marion	44 min
Jun 23, 3:29 PM EDT	Special Weather Statement	JAX	Clay	46 min
Jun 23, 3:35 PM EDT	Special Weather Statement	JAX	Union	40 min
Jun 23, 3:41 PM EDT	Special Weather Statement	JAX	Gilchrist	49 min
Jun 23, 3:55 PM EDT	Special Weather Statement	JAX	Saint Johns	50 min
Jun 23, 4:11 PM EDT	Special Weather Statement	JAX	Putnam	49 min
Jun 23, 4:34 PM EDT	Special Weather Statement	JAX	Flagler	41 min
Jun 23, 4:47 PM EDT	Special Weather Statement	JAX	Lafayette	58 min
Jun 23, 5:01 PM EDT	Special Weather Statement	JAX	Putnam	44 min
Jun 23, 5:42 PM EDT	Special Weather Statement	JAX	Marion	48 min
Jun 23, 6:11 PM EDT	Areal Flood Warning	JAX	Marion	111 min
Jun 23, 6:45 PM EDT	Special Weather Statement	JAX	Baker	45 min
Jun 23, 7:46 PM EDT	Special Weather Statement	JAX	Columbia	44 min
Jun 23, 4:53 PM EDT	Special Weather Statement	JAX	Echols	52 min
Jun 23, 5:25 PM EDT	Areal Flood Warning	JAX	Clinch, Echols, Ware	67 min
Jun 23, 5:32 PM EDT	Special Weather Statement	JAX	Charlton	43 min
Jun 23, 7:44 PM EDT	Special Weather Statement	JAX	Ware	46 min

Nearby

Special Weather Statements in Florida, 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.