Alert archive / Florida / Special Weather Statements in 2016

Special Weather Statement, NWS Tallahassee, FL

May 20, 20166 counties in Florida; Seminole County, Georgia

NWS Tallahassee, FL issued this special weather statement at May 20, 2016, 5:29 AM CDT for 6 counties in Florida; Seminole County, Georgia. It was in force for 61 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, 5:29 AM CDT (10:29 UTC)
Expired: May 20, 2016, 6:30 AM CDT
In force: 61 min
Issued by: NWS Tallahassee, FL

Counties Bay County, FL, Calhoun County, FL, Gulf County, FL, Jackson County, FL, Liberty County, FL, Washington County, FL, Seminole County, GA

The radar

The Eglin Afb radar (KEVX), 77 km from the middle of the area, began a volume at 10:31 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 00:00Z, 10.5 hours before the alert went out and 94 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: 2260 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 939 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.5

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, 2:43 AM CDT, 2 hours 46 minutes earlier.

Area forecast discussion, May 20, 2:43 AM CDT, 2 hours 46 minutes before

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

...Severe Storms Possible Today...

.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.

&&

.AVIATION [Through 06Z Saturday]...

LIFR conditions are expected at TLH and VLD with MVFR at all other
terminals. Visibility will improve after sunrise. A line of strong
thunderstorms will move through this morning with gusty winds
possible. Expect storms to arrive at ECP by 11Z and spread east,
reaching VLD by 17Z.

&&

.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

Special weather statement, May 20, 4:24 AM CDT, 1 hour 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
424 AM CDT FRI MAY 20 2016

ALZ065-066-068-069-201030-
DALE AL-HOUSTON AL-COFFEE AL-GENEVA AL-
424 AM CDT FRI MAY 20 2016

...SIGNIFICANT WEATHER ADVISORY FOR COFFEE...WESTERN HOUSTON...GENEVA
AND DALE COUNTIES UNTIL 530 AM CDT...

AT 423 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 10 MILES SOUTHWEST OF SAMSON...OR 12 MILES EAST OF
FLORALA...MOVING EAST AT 40 MPH.

WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
DALEVILLE...ELBA...GENEVA...OZARK...FORT RUCKER...ENTERPRISE...DOTHAN...
HARTFORD...TAYLOR...MIDLAND CITY...LEVEL PLAINS...SLOCOMB...SAMSON...
NEWTON...NEW BROCKTON...ARITON...PINCKARD...LEE...MALVERN AND CLAYHATCHEE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 AM CDT FOR
SOUTHEASTERN ALABAMA.

LAT...LON 3153 8619 3154 8614 3162 8615 3162 8552
      3100 8544 3100 8619
TIME...MOT...LOC 0923Z 257DEG 36KT 3098 8612

1-WESTON

Special weather statement, May 20, 5:29 AM CDT, 0 minutes before

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

ALZ068-FLZ009>016-026-027-112-114-115-GAZ155-156-201130-
GENEVA AL-JACKSON FL-INLAND GULF FL-INLAND FRANKLIN FL-
COASTAL GULF FL-COASTAL BAY FL-INLAND BAY FL-COASTAL FRANKLIN FL-
LIBERTY FL-HOLMES FL-INLAND WAKULLA FL-CALHOUN FL-WASHINGTON FL-
GADSDEN FL-DECATUR GA-SEMINOLE GA-
629 AM EDT FRI MAY 20 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN GENEVA...LIBERTY...
SOUTHWESTERN FRANKLIN...NORTHWESTERN WAKULLA...EASTERN WASHINGTON...
EASTERN HOLMES...JACKSON...BAY...WESTERN GADSDEN...GULF...CALHOUN...
SOUTHWESTERN LEON...DECATUR AND SEMINOLE COUNTIES UNTIL 730 AM
EDT/630 AM CDT/...

AT 626 AM EDT/526 AM CDT/...NATIONAL WEATHER SERVICE DOPPLER RADAR
INDICATED A STRONG THUNDERSTORM 15 MILES SOUTH OF MARIANNA...MOVING
EAST AT 45 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
PANAMA CITY...LYNN HAVEN...CALLAWAY...BLOUNTSTOWN...PORT ST. JOE...
MARIANNA...CHIPLEY...GRACEVILLE...APALACHICOLA...SPRINGFIELD...MEXICO
BEACH...CHATTAHOOCHEE...HILAND PARK...GREENSBORO...STONEMILL CREEK...
TYNDALL AIR FORCE BASE...ORANGE...BRADFORD...FRANKLIN AND PARKER.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 AM EDT/800 AM
CDT/ FOR SOUTHEASTERN ALABAMA...CENTRAL FLORIDA AND SOUTHWESTERN
GEORGIA.

LAT...LON 2989 8536 3012 8570 3100 8565 3097 8466
      2979 8475 2967 8526
TIME...MOT...LOC 1026Z 270DEG 38KT 3056 8530

1-WESTON

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 2:51 AM CDT	Special Marine Warning	TAE		114 min
May 20, 3:31 AM CDT	Severe Thunderstorm Warning	TAE	Walton	59 min
May 20, 4:30 AM CDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Holmes, Jackson, Walton, Washington	60 min
May 20, 4:39 AM CDT	Special Marine Warning	TAE		96 min
May 20, 5:42 AM CDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 4 more	63 min
May 20, 6:02 AM CDT	Special Marine Warning	TAE		118 min
May 20, 6:31 AM CDT	Severe Thunderstorm Warning	TAE	Franklin, Gadsden, Leon, Liberty, Wakulla	74 min
May 20, 7:39 AM CDT	Special Weather Statement	TAE	Jefferson	51 min
May 20, 7:42 AM CDT	Special Marine Warning	TAE		2 hr
May 20, 7:57 AM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Taylor	63 min
May 20, 8:39 AM CDT	Severe Thunderstorm Warning	TAE	Dixie, Lafayette, Taylor	62 min
May 20, 10:12 AM CDT	Rip Current Statement	TAE	Gulf	13 hr
May 20, 10:41 AM CDT	Special Marine Warning	TAE		2 hr
May 20, 12:28 PM CDT	Special Marine Warning	TAE		2 hr
May 20, 2:21 PM CDT	Special Marine Warning	TAE		114 min
May 20, 4:24 AM CDT	Special Weather Statement	TAE	Coffee, Dale, Geneva	66 min

Nearby

Special Weather Statements in Florida, 2016 Special Weather Statements in Georgia, 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.