Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

July 11, 2021Clay County, Florida

NWS Jacksonville, FL issued this special weather statement at Jul 11, 2021, 4:49 PM EDT for Clay County, Florida. It was in force for 26 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 11, 2021, 4:49 PM EDT (20:49 UTC)
Expired: Jul 11, 2021, 5:15 PM EDT
In force: 26 min
Issued by: NWS Jacksonville, FL

County Clay County, FL

The radar

The Jacksonville radar (KJAX), 72 km from the middle of the area, began a volume at 20:52 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, 8.8 hours before the alert went out and 73 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: 458 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1092 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: -29 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 11, 4:11 PM EDT, 38 minutes earlier.

Area forecast discussion, Jul 11, 4:11 PM EDT, 38 minutes before

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In the hours before

Special weather statement, Jul 11, 3:52 PM EDT, 57 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
352 PM EDT Sun Jul 11 2021

FLZ232-325-425-112030-
Western Clay FL-Western Duval FL-South Central Duval FL-
352 PM EDT Sun Jul 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CLAY AND
SOUTHWESTERN DUVAL COUNTIES UNTIL 430 PM EDT...

* At 351 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm near Maxville, or 7 miles northwest
  of Middleburg, moving northeast at 10 mph.

* Small hail, excessive cloud-to-ground lightning, wind gusts of 45
  to 55 mph, and minor flooding due to heavy rainfall is possible
  with this storm.

* Locations impacted include...
  Middleburg, Cecil Field, Oakleaf Plantation, Bellair-Meadowbrook
  Terrace, Baldwin and Jacksonville Heights.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

Torrential rainfall is 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. 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 3019 8173 3018 8174 3005 8189 3012 8204
      3035 8195 3025 8166
TIME...MOT...LOC 1951Z 208DEG 9KT 3015 8195

AK

Special weather statement, Jul 11, 4:20 PM EDT, 29 minutes before

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Special weather statement, Jul 11, 4:22 PM EDT, 27 minutes before

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Special weather statement, Jul 11, 4:26 PM EDT, 23 minutes before

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Local storm report, Jul 11, 4:34 PM EDT, 15 minutes before

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Special weather statement, Jul 11, 4:49 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 11, 1:42 PM EDT	Special Weather Statement	JAX	Alachua	48 min
Jul 11, 2:15 PM EDT	Special Weather Statement	JAX	Alachua	45 min
Jul 11, 2:47 PM EDT	Special Weather Statement	JAX	Union	43 min
Jul 11, 3:23 PM EDT	Special Weather Statement	JAX	Baker, Bradford, Union	52 min
Jul 11, 3:52 PM EDT	Special Weather Statement	JAX	Clay	38 min
Jul 11, 4:02 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval	11 min
Jul 11, 4:20 PM EDT	Special Weather Statement	JAX	Marion	40 min
Jul 11, 4:22 PM EDT	Special Weather Statement	JAX	Duval	38 min
Jul 11, 4:26 PM EDT	Special Weather Statement	JAX	Clay	34 min
Jul 11, 5:23 PM EDT	Special Weather Statement	JAX	Duval	37 min
Jul 11, 5:39 PM EDT	Special Weather Statement	JAX	Flagler	36 min
Jul 11, 6:04 PM EDT	Special Weather Statement	JAX	Saint Johns	26 min
Jul 11, 6:27 PM EDT	Special Weather Statement	JAX	Putnam	33 min
Jul 11, 6:32 PM EDT	Special Marine Warning	JAX		33 min
Jul 11, 5:12 PM EDT	Special Weather Statement	JAX	Camden	33 min
Jul 11, 6:30 PM EDT	Special Weather Statement	JAX	Camden	30 min
Jul 11, 6:41 PM EDT	Special Weather Statement	JAX	Wayne	34 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.