Alert archive / Georgia / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 175, NWS Jacksonville, FL

July 27, 2018Camden County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 27, 2018, 6:13 PM EDT for Camden County, Georgia. It was in force for 47 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, 2018, 6:13 PM EDT (22:13 UTC)
Expired
Jul 27, 2018, 7:00 PM EDT
In force
47 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Camden County, GA

The radar

The Jacksonville radar (KJAX), 49 km from the middle of the area, began a volume at 22:12 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, 10.2 hours before the alert went out and 47 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 2018-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1686 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 2018-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -27 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
1686 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
705 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-27 m²/s²
0-3 km storm-relative helicity
-32 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, 3:50 PM EDT, 2 hours 23 minutes earlier.

Area forecast discussion, Jul 27, 3:50 PM EDT, 2 hours 23 minutes before
Area Forecast Discussion
National Weather Service Jacksonville FL
350 PM EDT Fri Jul 27 2018

.NEAR TERM (Through Saturday night)...

Convection rather sparse this afternoon due to short wave ridging
and slightly drier air (lower PW) over the area. Isolated storms
possible this eve...out ahead of stationary front...across Se Ga and
along the east coast as seabreezes converge. Any storms that manage
to get going will fade out after the loss of heating. Pops increase
again on Saturday as the short wave ridge moves offshore and a short
wave trough moves into Se Ga leading to a more moist and unstable Sw
flow. Should be more coverage of storms...as a result... with
highest pops across inland Se Ga...near the stationary front...and
between I-95 and U.S. Hwy 301 in Ne Fl where seabreezes and outflows
merge.

.SHORT TERM (Sunday-Monday night)...

The deep layer western Atlantic ridge will move further north and be
positioned over N Fl by Sunday resulting in a weaker southwest flow
which enables west and east coast sea breezes to trigger convection
in the aftn. Overall...not much change to the pattern. Highs mainly
in the lower 90s again.

.LONG TERM...(Tuesday-Friday)...

The deep layer western Atlantic ridge builds further west with the
axis just north of the area by the end of the period. There is more
than enough moisture with PWATs likely to be near or above normal
along with aftn sea breeze boundaries to keep at least scattered
showers and storms each day. Pops will tend to be somewhat higher
across the western half of the area each day. Daytime temps will
average near to slightly below normal each day.

&&

.AVIATION...Isolated storms possible the remainder of
the afternoon as seabreezes converge inland. Have VCTS at most
terminals (except GNV) til around 00Z-01Z.
Otherwise prevailing VFR.

&&

.MARINE...Surface ridge will build over the waters through
early next week. South winds generally 10 to 15 knots increasing to
around 15 knots offshore early next week. Winds southeast near shore
during the afternoon. Seas 2 to 4 feet near shore and 3 to 5 feet
offshore. A brief period of exercise caution possible offshore
Tuesday night. Scattered mainly afternoon and evening showers
and thunderstorms.

Rip Currents: A moderate risk through Saturday due to a persistent
long period swell.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  74  93  73  91 /  40  50  40  60
SSI  77  90  77  88 /  30  30  30  50
JAX  74  92  74  91 /  30  40  30  50
SGJ  76  91  74  88 /  30  40  20  50
GNV  73  92  73  90 /  20  40  30  60
OCF  74  92  73  89 /  20  50  30  60

&&

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

&&

PP/PW/CE

In the hours before

Special weather statement, Jul 27, 5:38 PM EDT, 35 minutes before
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Special weather statement, Jul 27, 5:49 PM EDT, 24 minutes before
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Special weather statement, Jul 27, 5:55 PM EDT, 18 minutes before
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Special weather statement, Jul 27, 5:56 PM EDT, 17 minutes before
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Special weather statement, Jul 27, 6:01 PM EDT, 12 minutes before
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Local storm report, Jul 27, 6:08 PM EDT, 5 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 4:43 PM EDTSpecial Weather StatementJAXDuval47 min
Jul 27, 4:56 PM EDTSpecial Weather StatementJAXFlagler49 min
Jul 27, 5:12 PM EDTSpecial Marine WarningJAX63 min
Jul 27, 5:15 PM EDTSpecial Marine WarningJAX60 min
Jul 27, 5:22 PM EDTSevere Thunderstorm WarningJAXDuval25 min
Jul 27, 5:24 PM EDTSevere Thunderstorm WarningJAXFlagler21 min
Jul 27, 5:38 PM EDTSpecial Weather StatementJAXNassau52 min
Jul 27, 5:44 PM EDTSpecial Marine WarningJAX91 min
Jul 27, 5:49 PM EDTSpecial Weather StatementJAXDuval26 min
Jul 27, 5:50 PM EDTAreal Flood AdvisoryJAXNassau55 min
Jul 27, 5:53 PM EDTAreal Flood AdvisoryJAXFlagler55 min
Jul 27, 5:56 PM EDTSpecial Weather StatementJAXMarion49 min
Jul 27, 6:16 PM EDTSpecial Marine WarningJAX58 min
Jul 27, 6:39 PM EDTSpecial Weather StatementJAXBaker, Nassau51 min
Jul 27, 6:47 PM EDTSpecial Weather StatementJAXClay43 min
Jul 27, 7:01 PM EDTSevere Thunderstorm WarningJAXClay, Saint Johns44 min
Jul 27, 7:20 PM EDTSpecial Weather StatementJAXPutnam40 min
Jul 27, 7:22 PM EDTSpecial Marine WarningJAX36 min
Jul 27, 7:26 PM EDTAreal Flood AdvisoryJAXClay, Saint Johns64 min
Jul 27, 7:34 PM EDTSpecial Weather StatementJAXDuval, Nassau56 min
Jul 27, 7:40 PM EDTSpecial Weather StatementJAXSaint Johns35 min
Jul 27, 7:54 PM EDTSpecial Marine WarningJAX96 min
Jul 26, 8:19 PM EDTAreal Flood AdvisoryJAXAppling, Bacon, Jeff Davis56 min
Jul 26, 9:37 PM EDTAreal Flood AdvisoryJAXAppling, Jeff Davis53 min
Jul 26, 10:28 PM EDTSpecial Weather StatementJAXAtkinson17 min
Jul 27, 5:02 PM EDTSpecial Weather StatementJAXAtkinson28 min
Jul 27, 5:27 PM EDTSpecial Weather StatementJAXGlynn48 min
Jul 27, 5:32 PM EDTSpecial Weather StatementJAXWare43 min
Jul 27, 5:40 PM EDTSevere Thunderstorm WarningJAXCamden, Glynn50 min
Jul 27, 5:55 PM EDTSpecial Weather StatementJAXCharlton, Ware50 min
Jul 27, 6:01 PM EDTSpecial Weather StatementJAXBrantley, Camden59 min
Jul 27, 6:19 PM EDTAreal Flood AdvisoryJAXCamden, Glynn70 min
Jul 27, 6:59 PM EDTSpecial Weather StatementJAXCamden61 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2018Every severe thunderstorm warning in 2018

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.