Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 114, NWS Tallahassee, FL

July 3, 2018Jefferson County, Leon County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Jul 3, 2018, 7:43 PM EDT for Jefferson County, Leon County, Florida. It was in force for 16 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 3, 2018, 7:43 PM EDT (23:43 UTC)
Expired
Jul 3, 2018, 7:59 PM EDT
In force
16 min
Issued by
NWS Tallahassee, FL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Jefferson County, FL, Leon County, FL

The radar

The Tallahassee radar (KTLH), 24 km from the middle of the area, began a volume at 23:46 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 11.7 hours before the alert went out and 21 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, Tallahassee Rgnl, FL at 12:00Z on 2018-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1618 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, Tallahassee Rgnl, FL at 12:00Z on 2018-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -50 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
1618 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
796 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-50 m²/s²
0-3 km storm-relative helicity
-40 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 Tallahassee, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 3, 7:24 PM EDT, 19 minutes earlier.

Area forecast discussion, Jul 3, 7:24 PM EDT, 19 minutes before
Area Forecast Discussion
National Weather Service Tallahassee FL
724 PM EDT Tue Jul 3 2018

.AVIATION [Through 00Z Thursday]...

TSRA persists around the TAF sites this evening with the most
likely chance of affecting TLH and ABY over the next few hours.
Should dissipate by 04z with scattered TSRA expected again
Wednesday afternoon. Expect wind gusts and low vsbys with the
TSRA, otherwise VFR conditions are expected.

&&

.PREV DISCUSSION [250 PM EDT]...

.NEAR TERM [Through Tonight]...

Scattered showers and thunderstorms will continue to develop mainly
along and west of the river this afternoon and move to the west.
Then, we should see a broken line of showers and thunderstorms
associated with the east coast sea breeze arrive late this afternoon
over our easternmost zones. This convection is forecast by a few of
the hi-res models to continue to move westward across the remainder
of the CWA through the evening and possibly into the early morning
hours. Pops will be in the 40-50% range until 06z. Lows will be in
the lower 70s.

.SHORT TERM [Wednesday Through Thursday Night]...

A tropical upper tropospheric trough will move westward into the
FL Peninsula on Wednesday afternoon and evening, with a surge of
deep layer moisture just west of this feature moving into our area
during these times. PW values around or over 2.0" will combine
with sea breeze forcing and ample instability (SBCAPE 1500-2500
J/kg) to result in high coverage of showers and thunderstorms.
Highest chances will be across the FL Big Bend and parts of SW
Georgia, as the Atlantic sea breeze is projected to move into
these areas during the late afternoon and early evening and
enhance potential for showers/thunderstorms. However, during
Wednesday evening after 00Z, chances of showers and storms should
be much lower as the atmosphere is projected to stabilize behind
the initial wave of showers/thunderstorms.

Drier conditions are expected on Thursday as drier mid-level air
moves over our area from the east behind the aforementioned upper
trough. Still, some scattered showers and thunderstorms are
possible during peak heating hours (afternoon and early evening)
as the sea breeze moves inland. Highs on both Wednesday and
Thursday will range from the upper 80s to lower 90s across our
area.

.LONG TERM [Friday Through Tuesday]...

Another upper level low is expected to move westward across our
area on Friday morning and afternoon, with seasonably moist
conditions persisting throughout the day on Friday. This will
result in decent coverage of scattered showers and thunderstorms
across our area, especially during the afternoon and early
evening as sea breeze forcing and instability are maximized. Even
higher chances of showers and thunderstorms are expected this
weekend as a weak surface trough/front drifts southward toward
northern portions of our area. Ample deep layer moisture will
persist from the weekend through early next week as well. As a
result, showers and thunderstorms will be likely across our area
on Saturday and Sunday, with high-end chances continuing through
Monday and Tuesday. Highs will range from the upper 80s to lower
90s across our area for most of this period, but possibly remain
in the mid-upper 80s on Sunday under more widespread cloud cover
and showers/storms.

.MARINE...

Generally light winds around 10 knots or less and seas of 2 feet
or less will continue through the next several days, along with
persistent chances of showers and thunderstorms.

.FIRE WEATHER...

Hazardous fire weather conditions are not expected through the
remainder of the week as RHs will remain above critical levels.
An exception will be Wednesday afternoon, where high dispersions
will be likely in the Florida Panhandle, generally west of the
Apalachicola River. Chances for wetting rains will increase again
on Wednesday, with chances persisting into the weekend.

.HYDROLOGY...

Rivers and streams are likely to remain below flood stage through
the next few days; heavier rain from scattered showers and
thunderstorms is generally expected to be short-lived. However, a
few rivers/streams could continue to reach action stage at times,
and minor flooding cannot be ruled out in isolated areas that
receive more persistent showers and thunderstorms.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not requested. However, spotters are always
encouraged to safely report significant weather conditions when they
occur by calling the office or tweeting us @NWSTallahassee.

&&

.PRELIMINARY POINT TEMPS/POPS...

Tallahassee   73  89  71  90  72 /  40  70  20  30  20
Panama City   76  90  73  87  74 /  50  60  30  50  20
Dothan        73  90  72  89  72 /  50  50  40  20  20
Albany        74  90  72  91  73 /  40  60  30  20  20
Valdosta      72  87  70  90  71 /  40  70  20  40  20
Cross City    72  89  70  90  72 /  40  70  40  30  20
Apalachicola  75  87  74  86  75 /  50  40  30  30  20

&&

.TAE WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AL...None.
GM...None.
&&

NEAR TERM...Barry
SHORT TERM...Lahr
LONG TERM...Lahr
AVIATION...Fieux
MARINE...Lahr
FIRE WEATHER...Pullin
HYDROLOGY...Lahr

In the hours before

Local storm report, Jul 3, 7:00 PM EDT, 43 minutes before
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Special weather statement, Jul 3, 7:03 PM EDT, 40 minutes before
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Special weather statement, Jul 3, 7:14 PM EDT, 29 minutes before
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Special weather statement, Jul 3, 7:26 PM EDT, 17 minutes before
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Special weather statement, Jul 3, 7:31 PM EDT, 12 minutes before
Special Weather Statement
National Weather Service Tallahassee FL
731 PM EDT TUE JUL 3 2018

GAZ145-040015-
Mitchell GA-
731 PM EDT TUE JUL 3 2018

...SIGNIFICANT WEATHER ADVISORY FOR MITCHELL COUNTY UNTIL 815 PM
EDT...

At 731 PM EDT, Doppler radar was tracking a strong thunderstorm 8
miles west of Doerun, or 9 miles northeast of Camilla, moving west at
20 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Pelham, Camilla, Sale City, Laney, Lester, Flint, Freeman, Mitchell
Co A/P, Branchville, Greenough, Hinsonton and Cotton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also 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.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3138 8400 3116 8400 3108 8427 3108 8436
      3122 8441 3124 8436 3126 8436 3128 8434
      3131 8433 3131 8432 3132 8431 3132 8429
      3134 8427
TIME...MOT...LOC 2331Z 072DEG 17KT 3128 8405

32
Local storm report, Jul 3, 7:36 PM EDT, 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
736 PM EDT TUE JUL 3 2018

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

0536 PM     TSTM WND DMG     2 SSE WEWAHITCHKA       30.09N 85.18W
07/03/2018                   GULF               FL   TRAINED SPOTTER

            1 TREE SNAPPED AT THE INTERSECTION OF SUNSET
            DR AND TANGLEWOOD ST. PICTURE SENT BY
            TRAINED SPOTTER.

&&

JP

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 4:15 PM EDTSpecial Weather StatementTAEDixie45 min
Jul 3, 5:14 PM EDTSpecial Marine WarningTAE46 min
Jul 3, 5:20 PM EDTSpecial Weather StatementTAECalhoun40 min
Jul 3, 5:26 PM EDTSevere Thunderstorm WarningTAECalhoun, Gulf, Liberty49 min
Jul 3, 5:45 PM EDTSpecial Marine WarningTAE60 min
Jul 3, 5:52 PM EDTSpecial Weather StatementTAEBay53 min
Jul 3, 6:02 PM EDTSpecial Weather StatementTAEMadison43 min
Jul 3, 6:08 PM EDTSpecial Weather StatementTAELiberty52 min
Jul 3, 6:41 PM EDTSpecial Weather StatementTAEWashington49 min
Jul 3, 6:47 PM EDTSpecial Marine WarningTAE58 min
Jul 3, 7:03 PM EDTSpecial Weather StatementTAETaylor42 min
Jul 3, 7:14 PM EDTSpecial Weather StatementTAEHolmes46 min
Jul 3, 7:26 PM EDTSpecial Weather StatementTAEJefferson34 min
Jul 3, 7:35 PM EDTSevere Thunderstorm WarningTAETaylor25 min
Jul 3, 7:43 PM EDTSpecial Marine WarningTAE92 min
Jul 3, 7:58 PM EDTSpecial Weather StatementTAEHolmes17 min
Jul 2, 8:41 PM EDTSpecial Weather StatementTAELowndes49 min
Jul 2, 9:09 PM EDTSevere Thunderstorm WarningTAELowndes36 min
Jul 2, 9:22 PM EDTSpecial Weather StatementTAECook38 min
Jul 3, 7:31 PM EDTSpecial Weather StatementTAEMitchell44 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.