Alert archive / Florida / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 175, NWS Jacksonville, FL

July 27, 2020Putnam County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 27, 2020, 4:04 PM EDT for Putnam County, Florida. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 27, 2020, 4:04 PM EDT (20:04 UTC)
Expired: Jul 27, 2020, 4:31 PM EDT
In force: 27 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Putnam County, FL

The radar

The Jacksonville radar (KJAX), 97 km from the middle of the area, began a volume at 20:06 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

Tampa Bay, FL (KTBW), launched 12:00Z, 8.1 hours before the alert went out and 221 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: 799 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 923 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jul 27, 2:30 PM EDT, 1 hour 34 minutes earlier.

Area forecast discussion, Jul 27, 2:30 PM EDT, 1 hour 34 minutes before

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In the hours before

Special weather statement, Jul 27, 2:09 PM EDT, 1 hour 55 minutes before

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Special weather statement, Jul 27, 2:47 PM EDT, 1 hour 17 minutes before

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Special weather statement, Jul 27, 2:51 PM EDT, 1 hour 13 minutes before

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Special weather statement, Jul 27, 3:26 PM EDT, 38 minutes before

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Special weather statement, Jul 27, 3:42 PM EDT, 22 minutes before

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Special weather statement, Jul 27, 3:55 PM EDT, 9 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 27, 1:52 PM EDT	Special Weather Statement	JAX	Saint Johns	38 min
Jul 27, 2:09 PM EDT	Special Weather Statement	JAX	Columbia	36 min
Jul 27, 2:47 PM EDT	Special Weather Statement	JAX	Saint Johns	88 min
Jul 27, 2:51 PM EDT	Special Weather Statement	JAX	Duval	39 min
Jul 27, 3:26 PM EDT	Special Weather Statement	JAX	Duval	49 min
Jul 27, 3:42 PM EDT	Special Weather Statement	JAX	Clay	48 min
Jul 27, 3:55 PM EDT	Special Weather Statement	JAX	Putnam	50 min
Jul 27, 4:15 PM EDT	Special Weather Statement	JAX	Nassau	30 min
Jul 27, 4:28 PM EDT	Special Weather Statement	JAX	Flagler	32 min
Jul 27, 4:56 PM EDT	Special Weather Statement	JAX	Nassau	34 min
Jul 27, 5:14 PM EDT	Special Weather Statement	JAX	Flagler	31 min
Jul 27, 5:56 PM EDT	Areal Flood Warning	JAX	Nassau	117 min
Jul 27, 5:42 PM EDT	Special Weather Statement	JAX	Brantley	18 min
Jul 27, 6:12 PM EDT	Special Weather Statement	JAX	Brantley	33 min
Jul 27, 6:24 PM EDT	Areal Flood Warning	JAX	Brantley, Camden, Charlton	2 hr

Nearby

Severe Thunderstorm Warnings in Florida, 2020 Every severe thunderstorm warning in 2020

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.