Alert archive / Florida / Special Weather Statements in 2016

Special Weather Statement, NWS Tallahassee, FL

May 20, 2016Jefferson County, Florida

NWS Tallahassee, FL issued this special weather statement at May 20, 2016, 8:39 AM EDT for Jefferson County, Florida. It was in force for 51 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: May 20, 2016, 8:39 AM EDT (12:39 UTC)
Expired: May 20, 2016, 9:30 AM EDT
In force: 51 min
Issued by: NWS Tallahassee, FL

County Jefferson County, FL

The radar

The Tallahassee radar (KTLH), 53 km from the middle of the area, began a volume at 12:43 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, 0.7 hours before the alert went out and 51 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1309 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 606 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.0

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 Tallahassee, FL wrote its last area forecast discussion before this special weather statement went out at May 20, 6:53 AM EDT, 1 hour 46 minutes earlier.

Area forecast discussion, May 20, 6:53 AM EDT, 1 hour 46 minutes before

Area Forecast Discussion
National Weather Service Tallahassee FL
653 AM EDT FRI MAY 20 2016

.AVIATION [Through 12Z Saturday]...

LIFR ceilings will continue for the next few hours at TLH, DHN and
VLD. Squall line is currently moving through DHN and ECP and will
continue to move east through the morning. Expect gusty winds near
thunderstorms. Ceilings will improve to MVFR/VFR this afternoon.

&&

.PREV DISCUSSION [343 AM EDT]...

.NEAR TERM [Through Today]...

 As of 06Z an MCS was located over south Mississippi with a bowing
line of thunderstorms out ahead. Expect the leading edge of storms
to arrive around around 09Z. The HRRR has the best handle on the
system and timing has the line reaching the eastern part of the CWA
by early afternoon. So far the system is holding together, but
models show the line weakening as it reaches Tallahassee. The MCS
has produced winds gusts up to 70 mph in south Louisiana,and with
plenty of instability in place, expect the potential for damaging
winds to continue. Highs will range from  the upper 70s in southeast
Alabama to the upper 80s in the Big Bend.

.SHORT TERM [Tonight Through Sunday]...

The upper trough over the Great Plains will merge with a northern
stream trough as it progresses eastward with amplification of the
trough occurring east of the area on Sunday. The mesoscale vortex
associated with this morning's MCS will maintain itself as it tracks
east along a stationary front. It will actually lift the boundary
northward a bit keeping the region in a moist unstable air mass. The
extent of convection this evening will depend on how much the region
is stabilized by the passage of the QLCS this morning. Considering
the speed at which the boundary is moving, we believe that there
will be time to destabilize later today. We therefore maintain
likely PoPs for the evening hours. Shear will remain sufficient to
support some severe storms with damaging winds the primary threat.
The severe threat will linger into early Saturday across our
southeast zones south of a line from roughly Valdosta to
Tallahassee. A cold front will then bring a change in air mass
Saturday night with noticeably less humid conditions expected for
Sunday.

.LONG TERM [Sunday Night Through Friday]...

Most of this period will be rain-free with low humidity as high
pressure dominates. Dew points will be down in the 50s into Tuesday
and then gradually increase through the 60s after that. Morning lows
will be in the lower 60s with highs in the mid to upper 80s for the
beginning of the week. Look for upper 60s lows and upper 80s highs
mid to late week. Slight chances for thunderstorms return for
Thursday.

.MARINE...

A squall line of severe thunderstorms is expected to enter the
western waters before sunrise and gradually weaken as is races east
at 40 to 45 knots. After these storms departs, winds will generally
be onshore through tonight and then veer to westerly for Saturday. A
cold front will cross the waters Saturday night swinging winds to
offshore. Light onshore winds will then become reestablished early
next week.

.FIRE WEATHER...

There are no fire weather concerns for the next several days.

.HYDROLOGY...

While there is the possibility for heavy rain today, the line of
storms is moving very fast and unless it stalls, flash flooding
should not be problem. Rivers have been running low, so river
flooding is not a concern.

&&

.PRELIMINARY POINT TEMPS/POPS...

Tallahassee   84  71  87  67  86 /  70  50  30  20   0
Panama City   79  73  81  69  82 /  60  40  30  10   0
Dothan        80  68  85  62  82 /  80  60  20  10   0
Albany        82  68  85  63  82 /  90  70  30  10   0
Valdosta      84  69  86  65  84 /  70  60  40  20   0
Cross City    87  71  86  68  86 /  40  40  40  20   0
Apalachicola  80  73  83  69  83 /  50  40  30  10   0

&&

.TAE WATCHES/WARNINGS/ADVISORIES...

FL...None.
GA...None.
AL...None.
GM...None.

&&

NEAR TERM...Weston
SHORT TERM...Wool
LONG TERM...Wool
AVIATION...Weston
MARINE...Wool
FIRE WEATHER...Weston
HYDROLOGY...Weston

In the hours before

Local storm report, May 20, 7:33 AM EDT, 1 hour 6 minutes before

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Local storm report, May 20, 7:54 AM EDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
754 AM EDT FRI MAY 20 2016

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

0733 AM     TSTM WND DMG     OAK GROVE               30.69N 84.73W
05/20/2016                   GADSDEN            FL   911 CALL CENTER

            TREE DOWN IN THE OAK GROVE AREA

&&

DVD

Local storm report, May 20, 7:58 AM EDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
758 AM EDT FRI MAY 20 2016

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

0743 AM     TSTM WND GST     5 WSW ST GEORGE ISLAND  29.63N 84.94W
05/20/2016  M58 MPH          FRANKLIN           FL   MESONET

            58 MPH GUST MEASURED AT CWOP SITE CW8103 ON ST GEORGE
            ISLAND

&&

DVD

Local storm report, May 20, 8:20 AM EDT, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
820 AM EDT FRI MAY 20 2016

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

0746 AM     MARINE TSTM WIND 18 S ST GEORGE ISLAND   29.41N 84.86W
05/20/2016  M54 MPH          GMZ755             FL   C-MAN STATION

            47 KNOT GUST AT THE C TOWER

&&

DVD

Local storm report, May 20, 8:34 AM EDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
834 AM EDT FRI MAY 20 2016

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

0745 AM     TSTM WND DMG     3 ENE EASTPOINT         29.77N 84.83W
05/20/2016                   FRANKLIN           FL   911 CALL CENTER

            POWER LINE DOWN AT HIGHWAY 65 AND TERESA AVE

&&

DVD

Special weather statement, May 20, 8:39 AM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
839 AM EDT FRI MAY 20 2016

FLZ017>019-027-028-118-127-128-GAZ158-159-201330-
LEON FL-COASTAL WAKULLA FL-INLAND JEFFERSON FL-COASTAL JEFFERSON FL-
COASTAL TAYLOR FL-INLAND TAYLOR FL-INLAND WAKULLA FL-MADISON FL-
BROOKS GA-THOMAS GA-
839 AM EDT FRI MAY 20 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN TAYLOR...
JEFFERSON...NORTHEASTERN WAKULLA...EASTERN LEON...WESTERN MADISON...
SOUTHWESTERN BROOKS AND SOUTHEASTERN THOMAS COUNTIES UNTIL 930 AM
EDT...

AT 838 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES
SOUTH OF THOMASVILLE TO 9 MILES SOUTH OF ST. MARKS...AND MOVING EAST
AT 35 MPH.

WINDS 40 TO 50 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
MONTICELLO...THOMASVILLE...GREENVILLE...ECONFINA...DILLS...ERIDU...CAPPS...
CASA BLANCO...MONTIVILLA...WAUKEENAH...NANKIN...LLOYD...EMPRESS...EVERETT...
BAUM...PLUM ORCHARD...FESTUS...MICCOSUKEE...LAMONT AND HELLS HALF ACRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 AM EDT FOR
CENTRAL FLORIDA.

LAT...LON 2983 8371 2987 8375 3003 8405 3001 8422
      2999 8424 3081 8400 3070 8348 3068 8347
      3066 8343
TIME...MOT...LOC 1238Z 284DEG 32KT 3073 8395 3004 8415

42-DVD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 3:51 AM EDT	Special Marine Warning	TAE		114 min
May 20, 4:31 AM EDT	Severe Thunderstorm Warning	TAE	Walton	59 min
May 20, 5:30 AM EDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Holmes, Jackson, Walton, Washington	60 min
May 20, 5:39 AM EDT	Special Marine Warning	TAE		96 min
May 20, 6:29 AM EDT	Special Weather Statement	TAE	Bay, Calhoun, Gulf, Jackson, Liberty, Washington	61 min
May 20, 6:42 AM EDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 4 more	63 min
May 20, 7:02 AM EDT	Special Marine Warning	TAE		118 min
May 20, 7:31 AM EDT	Severe Thunderstorm Warning	TAE	Franklin, Gadsden, Leon, Liberty, Wakulla	74 min
May 20, 8:42 AM EDT	Special Marine Warning	TAE		2 hr
May 20, 8:57 AM EDT	Severe Thunderstorm Warning	TAE	Jefferson, Taylor	63 min
May 20, 9:39 AM EDT	Severe Thunderstorm Warning	TAE	Dixie, Lafayette, Taylor	62 min
May 20, 11:12 AM EDT	Rip Current Statement	TAE	Gulf	13 hr
May 20, 11:41 AM EDT	Special Marine Warning	TAE		2 hr
May 20, 1:28 PM EDT	Special Marine Warning	TAE		2 hr
May 20, 3:21 PM EDT	Special Marine Warning	TAE		114 min
May 20, 5:24 AM EDT	Special Weather Statement	TAE	Coffee, Dale, Geneva	66 min

Nearby

Special Weather Statements in Florida, 2016 Every special weather statement in 2016

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.