Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

July 12, 2021Duval County, Florida

NWS Jacksonville, FL issued this special weather statement at Jul 12, 2021, 2:47 PM EDT for Duval County, Florida. It was in force for 28 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: Jul 12, 2021, 2:47 PM EDT (18:47 UTC)
Expired: Jul 12, 2021, 3:15 PM EDT
In force: 28 min
Issued by: NWS Jacksonville, FL

County Duval County, FL

The radar

The Jacksonville radar (KJAX), 13 km from the middle of the area, began a volume at 18:50 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 15 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: 1794 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 846 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 5 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 Jul 12, 2:03 PM EDT, 44 minutes earlier.

Area forecast discussion, Jul 12, 2:03 PM EDT, 44 minutes before

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In the hours before

Special weather statement, Jul 12, 12:50 PM EDT, 1 hour 57 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
1250 PM EDT Mon Jul 12 2021

FLZ033-133-121730-
Coastal St. Johns FL-Inland St. Johns FL-
1250 PM EDT Mon Jul 12 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ST. JOHNS COUNTY
UNTIL 130 PM EDT...

* At 1250 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm near World Golf Village, or 10 miles
  west of Saint Augustine, moving northwest at 5 mph.

* Winds in excess of 45 mph and minor flooding due to heavy rainfall
  is possible with this storm.

* Locations impacted include...
  Fruit Cove, World Golf Village, Picolata, Switzerland and
  Bakersville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm. If
you can hear thunder, you are close enough to be struck! Seek a safe
shelter inside a building or vehicle.

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 2989 8133 2980 8145 2990 8161 2993 8160
      2997 8161 3001 8168 3003 8169 3011 8168
      3013 8166 3013 8160 3012 8157 3012 8154
      3011 8154 3010 8152
TIME...MOT...LOC 1650Z 140DEG 6KT 2992 8147

NELSON

Special weather statement, Jul 12, 1:26 PM EDT, 1 hour 21 minutes before

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Special weather statement, Jul 12, 1:42 PM EDT, 1 hour 5 minutes before

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Special weather statement, Jul 12, 1:45 PM EDT, 1 hour 2 minutes before

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Special weather statement, Jul 12, 2:33 PM EDT, 14 minutes before

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Special weather statement, Jul 12, 2:47 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
Jul 12, 9:45 AM EDT	River Flood Warning	JAX	Gilchrist, Suwannee	49 hr
Jul 12, 12:13 PM EDT	Special Weather Statement	JAX	Flagler	32 min
Jul 12, 12:43 PM EDT	Special Weather Statement	JAX	Flagler	47 min
Jul 12, 12:50 PM EDT	Special Weather Statement	JAX	Saint Johns	40 min
Jul 12, 1:08 PM EDT	Severe Thunderstorm Warning	JAX	Flagler, Marion, Putnam	37 min
Jul 12, 1:26 PM EDT	Special Weather Statement	JAX	Saint Johns	34 min
Jul 12, 1:42 PM EDT	Special Weather Statement	JAX	Marion	48 min
Jul 12, 1:45 PM EDT	Special Weather Statement	JAX	Suwannee	30 min
Jul 12, 2:33 PM EDT	Special Weather Statement	JAX	Marion	42 min
Jul 12, 3:13 PM EDT	Special Weather Statement	JAX	Marion	47 min
Jul 12, 3:14 PM EDT	Special Weather Statement	JAX	Nassau	46 min
Jul 12, 6:01 PM EDT	Special Weather Statement	JAX	Suwannee	29 min
Jul 12, 6:31 PM EDT	Special Weather Statement	JAX	Suwannee	44 min
Jul 12, 7:15 PM EDT	Special Weather Statement	JAX	Hamilton	45 min
Jul 12, 4:50 PM EDT	Special Weather Statement	JAX	Lanier	25 min
Jul 12, 7:30 PM EDT	Special Weather Statement	JAX	Clinch	45 min
Jul 12, 7:42 PM EDT	Special Weather Statement	JAX	Bacon	48 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.