Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

July 28, 2021Clay County, Florida

NWS Jacksonville, FL issued this special weather statement at Jul 28, 2021, 3:28 PM EDT for Clay County, Florida. It was in force for 32 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 28, 2021, 3:28 PM EDT (19:28 UTC)
Expired
Jul 28, 2021, 4:00 PM EDT
In force
32 min
Issued by
NWS Jacksonville, FL

County Clay County, FL

The radar

The Jacksonville radar (KJAX), 79 km from the middle of the area, began a volume at 19:31 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, 7.5 hours before the alert went out and 80 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-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2021-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 737 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2021-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -25 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
737 J/kg
Mixed-layer CIN
-74 J/kg
Mixed-layer LCL
915 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-25 m²/s²
0-3 km storm-relative helicity
-18 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 28, 2:49 PM EDT, 39 minutes earlier.

Area forecast discussion, Jul 28, 2:49 PM EDT, 39 minutes before
Area Forecast Discussion
National Weather Service Jacksonville FL
249 PM EDT Wed Jul 28 2021

.Near Term.../through Thursday/...

The region will be between high pressure to the southeast and weak
troughing to the northwest through Thursday. A weak area of low
pressure is expected to be to the northeast this evening, and
continue through Thursday. This low will affect the flow enough to
influence sea breeze interactions.

Convective coverage will be greatest over inland NE FL this
afternoon due to the Gulf coast sea breeze pushing in. Activity will
diminish this evening with loss of diurnal heating. For Thursday
afternoon, best sea breeze convergence will occur over NE FL, so
have focused highest precipitation chances there.

Temperatures will trend a little above normal Tonight. For Thursday,
highs will be near to a little below normal over NE FL due to
expected convective coverage, but a little above normal over SE GA
where not as much activity is expected.

&&

.Short Term.../Thursday night through Sunday/...

The region will be between high pressure to the southeast and a
frontal zone to the northwest this period. This will provide for a
mainly southwest flow, with the Gulf sea breeze most active as it
pushes inland through the day. The east coast sea breeze will
struggle to get much past I95 during the afternoons this period due
to the southwest flow. With this pattern will focus greatest
convective chances inland on the Gulf sea breeze.

Temperatures will trend above normal this period, with the
combination of heat and humidity likely pushing heat index values
into Advisory range for good portions of the area each afternoon
this period. Far inland NE FL should have lowest heat index values
due to the Gulf sea breeze, and increased potential for convection.

&&

.Long Term.../Sunday night through Wednesday/...

The pattern with the frontal zone just to the northwest and high
pressure to the southeast will continue through Monday. The frontal
zone will move further to the northwest Tuesday into Wednesday, with
high pressure building more toward the east. Moisture is expected to
increase across the region this period, with the Gulf sea breeze
being most active, as east coast sea breeze largely remains pinned
near the coast due to southwest flow. Above normal chances for
convection this period, mainly in the afternoon and evening hours.

Temperatures will trend near normal at night. Highs will trend from
near normal Monday to a little below normal Tuesday and Wednesday.

&&

.Marine...

The region will be between high pressure to the southeast and a
frontal zone to the northwest through the upcoming weekend. A weak
surface low will be just northeast of area waters through Thursday.

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

&&

.PRELIMINARY POINT TEMPS/POPS...

AMG  73  94  74  98  77 /  30  20   0  10   0
SSI  77  89  77  93  80 /  40  10   0  10   0
JAX  74  92  75  97  77 /  50  20  10  10   0
SGJ  74  89  75  93  77 /  50  30  10  10   0
GNV  74  90  75  93  76 /  50  60  20  30   0
OCF  73  90  75  93  76 /  50  60  20  30   0

&&

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

In the hours before

Special weather statement, Jul 28, 2:28 PM EDT, 1 hour before
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Special weather statement, Jul 28, 2:35 PM EDT, 53 minutes before
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Special weather statement, Jul 28, 2:43 PM EDT, 45 minutes before
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Special weather statement, Jul 28, 3:03 PM EDT, 25 minutes before
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Special weather statement, Jul 28, 3:07 PM EDT, 21 minutes before
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Special weather statement, Jul 28, 3:28 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
328 PM EDT Wed Jul 28 2021

FLZ132-137-232-237-282000-
Eastern Clay FL-Western Clay FL-Eastern Putnam FL-Western Putnam FL-
328 PM EDT Wed Jul 28 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN PUTNAM AND SOUTHERN
CLAY COUNTIES UNTIL 400 PM EDT...

* At 328 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm near George's Lake, or 8 miles east
  of Keystone Heights, moving east at 15 mph.

* Winds in excess of 45 mph and minor flooding due to heavy rainfall
  is possible with this storm.

* Locations impacted include...
  Keystone Heights, George's Lake, Bardin, Lake Geneva, Florahome,
  Putnam Hall and Carraway.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 2971 8164 2969 8200 2989 8205 2991 8167
TIME...MOT...LOC 1928Z 260DEG 11KT 2981 8191

NELSON

The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 27, 9:33 PM EDTRiver Flood WarningJAXAlachua, Columbia4 days
Jul 28, 2:07 PM EDTSpecial Weather StatementJAXGilchrist23 min
Jul 28, 2:18 PM EDTSpecial Weather StatementJAXFlagler27 min
Jul 28, 2:28 PM EDTSpecial Weather StatementJAXMarion32 min
Jul 28, 2:35 PM EDTSpecial Weather StatementJAXAlachua25 min
Jul 28, 2:43 PM EDTSpecial Weather StatementJAXAlachua32 min
Jul 28, 3:03 PM EDTSpecial Weather StatementJAXAlachua27 min
Jul 28, 3:07 PM EDTSpecial Weather StatementJAXPutnam38 min
Jul 28, 3:30 PM EDTSpecial Weather StatementJAXSaint Johns30 min
Jul 28, 3:41 PM EDTSpecial Weather StatementJAXBradford34 min
Jul 28, 3:42 PM EDTSpecial Weather StatementJAXMarion33 min
Jul 28, 3:59 PM EDTSpecial Weather StatementJAXPutnam46 min
Jul 28, 4:11 PM EDTSpecial Weather StatementJAXClay34 min
Jul 28, 4:40 PM EDTSpecial Weather StatementJAXDuval50 min
Jul 28, 5:40 PM EDTSpecial Weather StatementJAXDuval50 min
Jul 28, 5:44 PM EDTSpecial Weather StatementJAXBaker, Columbia46 min
Jul 28, 5:50 PM EDTSpecial Marine WarningJAX55 min
Jul 27, 8:10 PM EDTAreal Flood WarningJAXBrantley, Camden, Glynn3 hr
Jul 27, 8:16 PM EDTSpecial Weather StatementJAXWayne44 min
Jul 27, 8:42 PM EDTSpecial Weather StatementJAXBrantley48 min
Jul 27, 8:56 PM EDTSpecial Weather StatementJAXGlynn94 min
Jul 27, 9:04 PM EDTSpecial Weather StatementJAXAppling, Jeff Davis41 min
Jul 27, 9:44 PM EDTSpecial Weather StatementJAXAppling, Jeff Davis76 min
Jul 27, 10:14 PM EDTAreal Flood WarningJAXAppling, Bacon, Jeff Davis2 hr
Jul 27, 10:28 PM EDTSpecial Weather StatementJAXPierce62 min
Jul 27, 11:02 PM EDTAreal Flood WarningJAXBrantley, Pierce, Wayne118 min
Jul 28, 4:45 PM EDTSpecial Weather StatementJAXJeff Davis45 min
Jul 28, 5:27 PM EDTSpecial Weather StatementJAXBacon, Coffee, Jeff Davis63 min
Jul 28, 6:02 PM EDTSpecial Weather StatementJAXAtkinson43 min
Jul 28, 6:28 PM EDTSevere Thunderstorm WarningJAXAtkinson, Coffee17 min
Jul 28, 6:49 PM EDTSpecial Weather StatementJAXAtkinson26 min

Nearby

Special Weather Statements in Florida, 2021Every 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.