Alert archive / Florida / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 20, NWS Jacksonville, FL

April 6, 2019Marion County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 6, 2019, 4:22 PM EDT for Marion County, Florida. It was in force for 38 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
Apr 6, 2019, 4:22 PM EDT (20:22 UTC)
Expired
Apr 6, 2019, 5:00 PM EDT
In force
38 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Marion County, FL

The radar

The Jacksonville radar (KJAX), 146 km from the middle of the area, began a volume at 20:24 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, 8.4 hours before the alert went out and 148 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 2019-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 334 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 2019-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 102 square meters per square second.193958Sfc1 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
334 J/kg
Mixed-layer CIN
-82 J/kg
Mixed-layer LCL
847 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
102 m²/s²
0-3 km storm-relative helicity
130 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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 Apr 6, 4:14 PM EDT, 8 minutes earlier.

Area forecast discussion, Apr 6, 4:14 PM EDT, 8 minutes before
Area Forecast Discussion...CORRECTED
National Weather Service Jacksonville FL
414 PM EDT Sat Apr 6 2019

Scattered storms will continue to develop near a frontal
boundary across Se Ga and track slowly Se into the early
evening. Other scattered showers/storms will develop
across the Se portion of the area and track towards
the I-95 corridor before fading out this eve.

The frontal boundary across Se Ga will lift slowly north
and become diffuse later tonight into Sunday as a deep
layer ridge builds into the area. This results in mainly
diurnal convection on Sunday as opposed to all day convection
that was across Se Ga. Scattered afternoon and early evening
showers/storms will develop across inland areas where
seabreezes and outflows merge.Lingering showers and storms
possible early Sunday evening near the I-75 corridor will
fade out. Max temps Sunday afternoon warm to the mid to upper
80s inland and upper 70s to near 80 coast. Patchy late night
and early morning low clouds and fog will be possible both
tonight and tomorrow night.

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

A positive tilted upper trough will approach the area as
a closed low over eastern Tx moves into the Se U.S.
There continues to be differences in the models with
the GFS deeper and slower with the system. Nonetheless
the combination of an influx of gulf moisture coupled
with upper diffluence will lead to numerous showers
with isolated storms beginning late Monday afternoon
and continuing into Tuesday. Locally heavy rainfall
possible although amounts will be dependent on strength
of system. Early rainfall estimates suggests a potential
of 1 to 2 inch rainfall.

.LONG TERM (Wednesday-Saturday)...

Lingering showers possible Wednesday as the mid/upper
trough slowly moves out of the area. Drier conditions in
the wake of the trough thereafter with only scattered
afternoon showers possible Saturday. Temps average
slightly above normal.

&&

.AVIATION...A thunderstorm will produce ocnl MVFR at SSI and
SGJ til around 22Z-23Z. Otherwise prevailing VFR this eve. Low
clouds and patchy fog expected later tonight and have IFR cigs
beginning after 08Z-09Z.

&&

.MARINE...A weak pressure gradient will result in the sea breeze
moving inland before converging over the St Johns River area. The
initially mild winds offshore will strengthen as the day
progresses, pushing towards the ENE before weakening and becoming
more out of the south overnight. Fog may develop along the
coastline reducing visibilities overnight and into the early AM on
Sunday and then lingering over offshore waters through into the
beginning of next week.

Rip Currents: Moderate Risk Today and Tomorrow.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  80  63  86  64 /  60  40  30  30
SSI  74  64  76  65 /  30  30  10  10
JAX  83  65  85  64 /  20  20  20  10
SGJ  80  66  81  65 /  30  30  10  10
GNV  86  65  88  65 /  10  20  20  20
OCF  86  66  89  65 /  20  20  20  20

&&

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

&&

PP/MZ/NM

In the hours before

Special weather statement, Apr 6, 3:24 PM EDT, 58 minutes before
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Special weather statement, Apr 6, 3:45 PM EDT, 37 minutes before
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Special weather statement, Apr 6, 3:59 PM EDT, 23 minutes before
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Special weather statement, Apr 6, 4:03 PM EDT, 19 minutes before
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Special weather statement, Apr 6, 4:09 PM EDT, 13 minutes before
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Special weather statement, Apr 6, 4:14 PM EDT, 8 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 6, 3:24 PM EDTSpecial Weather StatementJAXCitrus36 min
Apr 6, 3:45 PM EDTSpecial Weather StatementJAXSaint Johns30 min
Apr 6, 4:03 PM EDTSpecial Weather StatementJAXFlagler27 min
Apr 6, 4:09 PM EDTSpecial Weather StatementJAXFlagler36 min
Apr 6, 4:14 PM EDTSpecial Weather StatementJAXMarion31 min
Apr 6, 4:31 PM EDTAreal Flood AdvisoryJAXFlagler89 min
Apr 6, 4:40 PM EDTSpecial Weather StatementJAXPutnam50 min
Apr 6, 4:47 PM EDTSpecial Weather StatementJAXMarion28 min
Apr 6, 4:49 PM EDTSpecial Weather StatementJAXFlagler26 min
Apr 6, 4:52 PM EDTSpecial Weather StatementJAXMarion23 min
Apr 6, 5:12 PM EDTSpecial Weather StatementJAXFlagler48 min
Apr 6, 5:20 PM EDTSpecial Weather StatementJAXMarion40 min
Apr 6, 5:30 PM EDTSevere Thunderstorm WarningJAXFlagler, Putnam45 min
Apr 6, 5:43 PM EDTAreal Flood AdvisoryJAXPutnam92 min
Apr 6, 5:45 PM EDTSpecial Weather StatementJAXPutnam45 min
Apr 6, 5:47 PM EDTSpecial Weather StatementJAXFlagler43 min
Apr 6, 6:13 PM EDTSpecial Weather StatementJAXPutnam47 min
Apr 6, 6:15 PM EDTSpecial Weather StatementJAXFlagler45 min
Apr 6, 7:08 PM EDTSpecial Weather StatementJAXDuval37 min
Apr 6, 7:20 PM EDTSpecial Marine WarningJAX55 min
Apr 6, 7:22 PM EDTSpecial Weather StatementJAXClay38 min
Apr 6, 7:26 PM EDTSpecial Weather StatementJAXDuval34 min
Apr 6, 7:36 PM EDTSevere Thunderstorm WarningJAXDuval, Nassau39 min
Apr 6, 7:46 PM EDTSpecial Marine WarningJAX47 min
Apr 6, 7:58 PM EDTSpecial Weather StatementJAXDuval47 min
Apr 6, 11:27 AM EDTSpecial Weather StatementJAXJeff Davis33 min
Apr 6, 12:02 PM EDTSpecial Weather StatementJAXCoffee28 min
Apr 6, 12:46 PM EDTSpecial Weather StatementJAXBacon44 min
Apr 6, 12:57 PM EDTSevere Thunderstorm WarningJAXBacon, Coffee33 min
Apr 6, 1:30 PM EDTSpecial Weather StatementJAXBacon45 min
Apr 6, 1:47 PM EDTSpecial Weather StatementJAXCoffee43 min
Apr 6, 2:21 PM EDTSpecial Weather StatementJAXPierce39 min
Apr 6, 3:01 PM EDTSpecial Weather StatementJAXWayne29 min
Apr 6, 3:16 PM EDTSpecial Weather StatementJAXGlynn44 min
Apr 6, 3:59 PM EDTSpecial Weather StatementJAXGlynn46 min
Apr 6, 4:25 PM EDTSevere Thunderstorm WarningJAXCamden, Glynn50 min
Apr 6, 5:15 PM EDTSevere Thunderstorm WarningJAXCamden, Glynn45 min
Apr 6, 6:03 PM EDTSpecial Weather StatementJAXCamden42 min

Nearby

Severe Thunderstorm Warnings in Florida, 2019Every severe thunderstorm warning in 2019

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.