Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

April 18, 2021Marion County, Florida

NWS Jacksonville, FL issued this special weather statement at Apr 18, 2021, 6:42 PM EDT for Marion County, Florida. It was in force for 48 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: Apr 18, 2021, 6:42 PM EDT (22:42 UTC)
Expired: Apr 18, 2021, 7:30 PM EDT
In force: 48 min
Issued by: NWS Jacksonville, FL

County Marion County, FL

The radar

The Tampa radar (KTBW), 160 km from the middle of the area, began a volume at 22:44 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 10.7 hours before the alert went out and 195 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: 298 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 852 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

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 Apr 18, 5:13 PM EDT, 1 hour 29 minutes earlier.

Area forecast discussion, Apr 18, 5:13 PM EDT, 1 hour 29 minutes before

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In the hours before

Local storm report, Apr 18, 2:23 PM EDT, 4 hours 19 minutes before

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Local storm report, Apr 18, 2:29 PM EDT, 4 hours 13 minutes before

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Local storm report, Apr 18, 2:34 PM EDT, 4 hours 8 minutes before

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Special weather statement, Apr 18, 6:42 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
Apr 17, 8:25 PM EDT	Severe Thunderstorm Warning	JAX	Flagler	35 min
Apr 17, 8:34 PM EDT	Special Marine Warning	JAX		56 min
Apr 17, 8:44 PM EDT	Special Weather Statement	JAX	Alachua	46 min
Apr 17, 8:56 PM EDT	Special Weather Statement	JAX	Putnam	49 min
Apr 17, 9:00 PM EDT	Special Weather Statement	JAX	Flagler	15 min
Apr 17, 9:32 PM EDT	Special Weather Statement	JAX	Flagler	58 min
Apr 17, 9:40 PM EDT	Special Weather Statement	JAX	Putnam	35 min
Apr 17, 10:13 PM EDT	Special Weather Statement	JAX	Flagler	32 min
Apr 17, 10:23 PM EDT	Special Marine Warning	JAX		19 min
Apr 18, 9:02 AM EDT	Special Weather Statement	JAX	Alachua	28 min
Apr 18, 10:16 AM EDT	Special Weather Statement	JAX	Flagler	44 min
Apr 18, 10:22 AM EDT	Special Marine Warning	JAX		83 min
Apr 18, 10:25 AM EDT	Severe Thunderstorm Warning	JAX	Flagler	22 min
Apr 18, 11:46 AM EDT	Special Marine Warning	JAX		14 min
Apr 18, 7:23 PM EDT	Special Weather Statement	JAX	Marion	37 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.