Alert archive / Florida / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 152, NWS Jacksonville, FL

June 27, 20204 counties in Florida; Charlton County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 27, 2020, 5:05 PM EDT for 4 counties in Florida; Charlton County, Georgia. It was in force for 40 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: Jun 27, 2020, 5:05 PM EDT (21:05 UTC)
Expired: Jun 27, 2020, 5:45 PM EDT
In force: 40 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Baker County, FL, Clay County, FL, Duval County, FL, Nassau County, FL, Charlton County, GA

The radar

The Jacksonville radar (KJAX), 24 km from the middle of the area, began a volume at 21:06 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.

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 Jun 27, 2:44 PM EDT, 2 hours 21 minutes earlier.

Area forecast discussion, Jun 27, 2:44 PM EDT, 2 hours 21 minutes before

Area Forecast Discussion
National Weather Service Jacksonville FL
244 PM EDT Sat Jun 27 2020

.Short Term.../through Wednesday/...

The region will be under the influence of a ridge of high pressure
at the surface and at 500mb through Sunday. However, short wave
energy is expected to pass through the upper ridge, which along
with diurnal instability and sea breeze interactions will provide
enough instability for activity this afternoon, and again Sunday
afternoon. For this afternoon, activity on the west coast sea
breeze will continue to work its way east across the forecast
area, with outflow boundaries helping to initiate further activity
down stream, which will all end up converging on the east coast
sea breeze of NE FL later this afternoon, where the greatest
potential for storms will exist. A fairly strong short wave passes
through overnight tonight, so can not rule out a few showers
during the night as well.

The surface high will sink to the south on Monday, as a trough of
low pressure develops under an upper trough, from northeast to
southwest across the southeastern US. This troughing will be in
place into Tuesday and Wednesday as well, with waves of energy
passing through the base of the upper trough. Increasing moisture is
expected next week, with convective chances on the rise.

Temperatures will continue above normal through at least Tuesday,
but may be closer to seasonal average on Wednesday due to
anticipated cloud and convective coverage.

&&

.Long Term.../Wednesday night through Saturday/...

Weak surface throughing under a building upper ridge is expected
this period. The main potential for convection will be in the
afternoon and evening hours due to diurnal heating and sea breeze
interactions. Best support for convection this period will be on
Thursday, then, with less upper support the coverage should
average scattered later this period.

Temperatures will trend above normal this period.

&&

.Marine...

High pressure will stretch across the region through Sunday. This
high will move to the south southeast Monday, as a trough of low
pressure stretches across the southeastern US. This trough will
be most pronounced through Wednesday then weaken.

Rip Currents: SE GA: Low through Sunday
              NE FL: Moderate Today, Low Sunday

&&

.PRELIMINARY POINT TEMPS/POPS...

AMG  73  95  74  94  75 /  20  10  10  20  10
SSI  76  91  77  92  78 /  20  20  10  10  20
JAX  74  97  74  97  77 /  50  20   0  10  10
SGJ  75  94  75  94  75 /  50  20  10  10  10
GNV  73  95  72  97  74 /  20  10   0  20   0
OCF  74  95  73  96  75 /  20  10   0  20  10

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AM...None.
&&

In the hours before

Special weather statement, Jun 27, 4:20 PM EDT, 45 minutes before

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Special weather statement, Jun 27, 4:28 PM EDT, 37 minutes before

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Special weather statement, Jun 27, 4:41 PM EDT, 24 minutes before

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Local storm report, Jun 27, 5:00 PM EDT, 5 minutes before

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Special weather statement, Jun 27, 5:03 PM EDT, 2 minutes before

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Local storm report, Jun 27, 5:05 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
Jun 27, 1:12 PM EDT	Special Weather Statement	JAX	Gilchrist	48 min
Jun 27, 1:51 PM EDT	Severe Thunderstorm Warning	JAX	Alachua	24 min
Jun 27, 1:57 PM EDT	Special Weather Statement	JAX	Gilchrist	48 min
Jun 27, 2:25 PM EDT	Special Weather Statement	JAX	Alachua	50 min
Jun 27, 2:45 PM EDT	Special Weather Statement	JAX	Putnam	45 min
Jun 27, 3:15 PM EDT	Special Weather Statement	JAX	Columbia, Suwannee	45 min
Jun 27, 3:27 PM EDT	Special Weather Statement	JAX	Putnam	48 min
Jun 27, 3:48 PM EDT	Special Weather Statement	JAX	Columbia, Suwannee	42 min
Jun 27, 4:02 PM EDT	Special Weather Statement	JAX	Clay, Flagler, Putnam, Saint Johns	58 min
Jun 27, 4:04 PM EDT	Special Marine Warning	JAX		116 min
Jun 27, 4:20 PM EDT	Special Weather Statement	JAX	Baker, Columbia	40 min
Jun 27, 4:23 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Putnam, Saint Johns	52 min
Jun 27, 4:28 PM EDT	Special Weather Statement	JAX	Duval	47 min
Jun 27, 4:38 PM EDT	Severe Thunderstorm Warning	JAX	Duval, Saint Johns	52 min
Jun 27, 4:41 PM EDT	Special Weather Statement	JAX	Baker	49 min
Jun 27, 5:03 PM EDT	Special Weather Statement	JAX	Flagler	27 min
Jun 27, 5:15 PM EDT	Special Marine Warning	JAX		90 min
Jun 27, 5:25 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval, Nassau, Saint Johns	50 min
Jun 27, 5:51 PM EDT	Special Marine Warning	JAX		66 min
Jun 27, 6:07 PM EDT	Special Weather Statement	JAX	Nassau	38 min

Nearby

Severe Thunderstorm Warnings in Florida, 2020 Severe Thunderstorm Warnings in Georgia, 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; radar from the NEXRAD Level II archive.