Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 100, NWS Jacksonville, FL

June 20, 2018Baker County, Columbia County, Union County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 20, 2018, 4:10 PM EDT for Baker County, Columbia County, Union County, Florida. It was in force for 50 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 20, 2018, 4:10 PM EDT (20:10 UTC)
Expired
Jun 20, 2018, 5:00 PM EDT
In force
50 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Baker County, FL, Columbia County, FL, Union County, FL

The radar

The Jacksonville radar (KJAX), 76 km from the middle of the area, began a volume at 20:09 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, 8.2 hours before the alert went out and 77 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 2018-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1714 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 2018-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 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
1714 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
811 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
49 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 Jun 20, 8:31 AM EDT, 7 hours 39 minutes earlier.

Area forecast discussion, Jun 20, 8:31 AM EDT, 7 hours 39 minutes before
Area Forecast Discussion
National Weather Service Jacksonville FL
831 AM EDT Wed Jun 20 2018

.Near Term.../Today/...

The region will be between high pressure to the Southeast and a
trough to the North Today. Diurnal instability will lead to
convective activity. With a prevailing Southwesterly
flow the West coast sea breeze will push convection toward the east
central portion of the region this afternoon, where it will meet
with the east coast sea breeze. So, the greatest chances for
convection will be this afternoon over inland NE FL.

Temperatures will moderate into the lower to middle 90s, away from
the immediate coast where readings will be a little cooler.

&&

.Aviation.../12z TAF period/...

Convection is expected to expand in coverage through the
afternoon hours, then dissipate during the evening hours.
Restrictions in and near storms will be possible along with gusty
winds.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  95  75  94  75 /  50  20  30  20
SSI  91  78  92  78 /  20  20  30  20
JAX  93  76  94  75 /  40  20  40  30
SGJ  92  75  91  75 /  50  30  40  30
GNV  91  74  91  75 /  60  30  40  20
OCF  91  74  91  75 /  60  30  30  20

&&

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

In the hours before

Special weather statement, Jun 20, 3:33 PM EDT, 37 minutes before
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Special weather statement, Jun 20, 3:39 PM EDT, 31 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
339 PM EDT WED JUN 20 2018

FLZ040-202030-
Marion FL-
339 PM EDT WED JUN 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN MARION COUNTY UNTIL 430
PM EDT...

At 339 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles northwest of Ocala Airport, or 8 miles northeast of Rainbow
Lakes Estates, moving southeast at 10 mph.

Excessive cloud-to-ground lightning and wind gusts of 40 to 50 mph
can be expected along with possible minor damage.

Locations impacted include...
Ocala, Rainbow Lakes Estates, Sparr, Anthony, Ocala Airport, Reddick,
McIntosh, Lowell and Romeo.

LAT...LON 2919 8254 2921 8253 2922 8240 2931 8241
      2947 8220 2946 8219 2946 8220 2945 8221
      2943 8221 2942 8220 2943 8217 2942 8215
      2942 8214 2927 8204 2896 8231
TIME...MOT...LOC 1939Z 306DEG 11KT 2922 8234

PETERSON
Local storm report, Jun 20, 3:51 PM EDT, 19 minutes before
PRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
351 PM EDT WED JUN 20 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0345 PM     TSTM WND DMG     2 NW NORMANDY           30.33N 81.79W
06/20/2018                   Duval              FL   EMERGENCY MNGR

            DOWNED TREE ON TOP OF HOME. PERSON TRAPPED INSIDE BUT
            OTHERWISE UNHARMED.

&&

WCORLESS
Local storm report, Jun 20, 3:55 PM EDT, 15 minutes before
PRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
355 PM EDT WED JUN 20 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0350 PM     LIGHTNING        4 NW NORMANDY           30.35N 81.82W
06/20/2018                   Duval              FL   EMERGENCY MNGR

            TRANSFORMER DAMAGED AND SMOKING DUE TO THUNDERSTORM.

&&

WCORLESS
Special weather statement, Jun 20, 3:58 PM EDT, 12 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
358 PM EDT WED JUN 20 2018

FLZ025-125-202045-
Inland Duval FL-Coastal Duval FL-
358 PM EDT WED JUN 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN DUVAL COUNTY UNTIL
445 PM EDT...

At 358 PM EDT, Doppler radar was tracking a strong thunderstorm near
Oceanway, or 7 miles north of Arlington, moving southeast at 5 mph.

Excessive cloud-to-ground lightning and wind gusts of 40 to 50 mph
can be expected along with possible minor damage.

Locations impacted include...
Jacksonville, Arlington, Oceanway, Craig Field, Fort Caroline and
Tallyrand.

LAT...LON 3041 8170 3053 8157 3039 8140 3024 8158
TIME...MOT...LOC 1958Z 310DEG 5KT 3044 8157

PETERSON
Special weather statement, Jun 20, 4:01 PM EDT, 9 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
401 PM EDT WED JUN 20 2018

FLZ022-023-030-031-202045-
Columbia FL-Baker FL-Union FL-Bradford FL-
401 PM EDT WED JUN 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN BRADFORD...SOUTHWESTERN
BAKER...UNION AND EAST CENTRAL COLUMBIA COUNTIES UNTIL 445 PM EDT...

At 401 PM EDT, Doppler radar was tracking a strong thunderstorm near
Olustee, or 15 miles east of Lake City, moving south at 10 mph.

Excessive cloud-to-ground lightning and wind gusts of 40 to 50 mph
can be expected along with possible minor damage.

Locations impacted include...
Lake Butler, Palestine Community, Groves, Lulu, Olustee, Sanderson
and Ellerbee.

LAT...LON 3032 8261 3042 8226 3014 8210 2995 8248
TIME...MOT...LOC 2001Z 340DEG 11KT 3025 8240

PETERSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 2:42 PM EDTSpecial Weather StatementJAXClay48 min
Jun 20, 2:45 PM EDTSpecial Weather StatementJAXBaker45 min
Jun 20, 3:30 PM EDTSpecial Weather StatementJAXDuval45 min
Jun 20, 3:33 PM EDTSpecial Weather StatementJAXBradford, Clay42 min
Jun 20, 3:39 PM EDTSpecial Weather StatementJAXMarion51 min
Jun 20, 3:58 PM EDTSpecial Weather StatementJAXDuval47 min
Jun 20, 4:01 PM EDTSpecial Weather StatementJAXBaker, Union44 min
Jun 20, 4:44 PM EDTSpecial Weather StatementJAXPutnam46 min
Jun 20, 4:47 PM EDTSpecial Weather StatementJAXColumbia43 min
Jun 20, 5:17 PM EDTSevere Thunderstorm WarningJAXNassau28 min
Jun 20, 6:02 PM EDTSpecial Weather StatementJAXFlagler43 min
Jun 20, 6:15 PM EDTSpecial Weather StatementJAXHamilton45 min
Jun 20, 7:08 PM EDTSpecial Weather StatementJAXColumbia, Hamilton, Suwannee52 min
Jun 20, 7:26 PM EDTSevere Thunderstorm WarningJAXSuwannee49 min
Jun 20, 3:21 PM EDTSpecial Weather StatementJAXWayne39 min
Jun 20, 3:22 PM EDTSpecial Weather StatementJAXBrantley38 min
Jun 20, 4:29 PM EDTSpecial Weather StatementJAXCamden46 min
Jun 20, 4:39 PM EDTSevere Thunderstorm WarningJAXCamden, Glynn51 min
Jun 20, 5:35 PM EDTSpecial Weather StatementJAXWayne40 min

Nearby

Severe Thunderstorm Warnings in Florida, 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.