Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

April 11, 2021Putnam County, Florida

NWS Jacksonville, FL issued this special weather statement at Apr 11, 2021, 9:40 AM EDT for Putnam County, Florida. It was in force for 50 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 11, 2021, 9:40 AM EDT (13:40 UTC)
Expired: Apr 11, 2021, 10:30 AM EDT
In force: 50 min
Issued by: NWS Jacksonville, FL

County Putnam County, FL

The radar

The Jacksonville radar (KJAX), 118 km from the middle of the area, began a volume at 13:42 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, 1.7 hours before the alert went out and 154 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: 449 J/kg
Mixed-layer CIN: -181 J/kg
Mixed-layer LCL: 1002 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 202 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

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 11, 7:55 AM EDT, 1 hour 45 minutes earlier.

Area forecast discussion, Apr 11, 7:55 AM EDT, 1 hour 45 minutes before

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In the hours before

Local storm report, Apr 11, 7:12 AM EDT, 2 hours 28 minutes before

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Local storm report, Apr 11, 7:19 AM EDT, 2 hours 21 minutes before

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Special weather statement, Apr 11, 7:26 AM EDT, 2 hours 14 minutes before

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Special weather statement, Apr 11, 7:45 AM EDT, 1 hour 55 minutes before

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Local storm report, Apr 11, 7:47 AM EDT, 1 hour 53 minutes before

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Special weather statement, Apr 11, 9:40 AM 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 11, 4:00 AM EDT	Special Weather Statement	JAX	Marion	45 min
Apr 11, 4:08 AM EDT	Severe Thunderstorm Warning	JAX	Marion	11 min
Apr 11, 4:34 AM EDT	Special Weather Statement	JAX	Marion	41 min
Apr 11, 4:48 AM EDT	Special Weather Statement	JAX	Alachua	42 min
Apr 11, 5:02 AM EDT	Special Weather Statement	JAX	Gilchrist	43 min
Apr 11, 5:23 AM EDT	Special Weather Statement	JAX	Flagler, Putnam	52 min
Apr 11, 5:44 AM EDT	Special Weather Statement	JAX	Alachua, Columbia, Gilchrist, Hamilton, Suwannee, Union	46 min
Apr 11, 6:08 AM EDT	Areal Flood Warning	JAX	Alachua, Columbia, Gilchrist	3 hr
Apr 11, 6:15 AM EDT	Special Weather Statement	JAX	Hamilton	60 min
Apr 11, 6:27 AM EDT	Special Weather Statement	JAX	Alachua, Baker, Bradford, Clay, Flagler, Putnam and 2 more	48 min
Apr 11, 6:51 AM EDT	Special Weather Statement	JAX	Duval, Nassau	39 min
Apr 11, 6:56 AM EDT	Special Weather Statement	JAX	Flagler, Marion, Putnam	49 min
Apr 11, 7:01 AM EDT	Special Weather Statement	JAX	Duval, Nassau	44 min
Apr 11, 7:03 AM EDT	Special Weather Statement	JAX	Suwannee	42 min
Apr 11, 7:08 AM EDT	Special Marine Warning	JAX		75 min
Apr 11, 7:26 AM EDT	Special Weather Statement	JAX	Marion	49 min
Apr 11, 7:42 AM EDT	Special Marine Warning	JAX		41 min
Apr 11, 9:46 AM EDT	Special Weather Statement	JAX	Union	44 min
Apr 11, 10:44 AM EDT	Special Weather Statement	JAX	Alachua, Flagler, Marion, Putnam, Saint Johns	61 min
Apr 11, 1:11 PM EDT	Special Weather Statement	JAX	Clay, Duval, Flagler, Nassau, Putnam, Saint Johns	49 min
Apr 11, 7:45 AM EDT	Special Weather Statement	JAX	Glynn	30 min
Apr 11, 12:16 PM EDT	Special Weather Statement	JAX	Atkinson	29 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.