Alert archive / Florida / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 413, NWS Tallahassee, FL

August 7, 20154 counties in Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Aug 7, 2015, 5:31 PM CDT for 4 counties in Florida. It was in force for 19 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: Aug 7, 2015, 5:31 PM CDT (22:31 UTC)
Expired: Aug 7, 2015, 5:50 PM CDT
In force: 19 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon

Counties Bay County, FL, Calhoun County, FL, Jackson County, FL, Washington County, FL

The radar

The Eglin Afb radar (KEVX), 38 km from the middle of the area, began a volume at 22:35 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 10.5 hours before the alert went out and 119 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: 1409 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 782 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

579 
WUUS52 KTAE 072231
SVRTAE
FLC005-013-063-133-072315-
/O.NEW.KTAE.SV.W.0413.150807T2231Z-150807T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
531 PM CDT FRI AUG 7 2015

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN WASHINGTON COUNTY IN THE PANHANDLE OF FLORIDA...
  NORTHWESTERN CALHOUN COUNTY IN THE PANHANDLE OF FLORIDA...
  NORTHEASTERN BAY COUNTY IN THE PANHANDLE OF FLORIDA...
  SOUTHWESTERN JACKSON COUNTY IN THE PANHANDLE OF FLORIDA...

* UNTIL 615 PM CDT

* AT 531 PM CDT...THE NATIONAL WEATHER SERVICE HAS DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
  MPH. THIS STORM WAS LOCATED NEAR VERNON...AND MOVING SOUTHEAST AT
  25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  VERNON...BRADFORD...WAUSAU...BETTS...SUNNY HILLS...MOOSE POND...
  GAINER SPRING...PORTER LAKE...SMYRNA...SPRING HOLLOW...CENTER
  LAKE...BROCK CROSSROAD...FOUNTAIN...YOUNGSTOWN...POPLAR HEAD...
  SAUNDERS...BENNETT...ORANGE HILL...SYLVANIA AND COMPASS LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE IMMEDIATELY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS UNTIL
THIS STORM PASSES.

&&

LAT...LON 3076 8559 3050 8524 3029 8552 3032 8554
      3032 8552 3033 8554 3036 8555 3036 8556
      3069 8575
TIME...MOT...LOC 2231Z 326DEG 20KT 3066 8562 

$$

11-MOORE

1 follow-up statement

313 
WWUS52 KTAE 072250
SVSTAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
550 PM CDT FRI AUG 7 2015

FLC005-013-063-133-072300-
/O.CAN.KTAE.SV.W.0413.000000T0000Z-150807T2315Z/
WASHINGTON FL-CALHOUN FL-BAY FL-JACKSON FL-
550 PM CDT FRI AUG 7 2015

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WASHINGTON...
NORTHWESTERN CALHOUN...NORTHEASTERN BAY AND SOUTHWESTERN JACKSON
COUNTIES IN THE PANHANDLE OF FLORIDA IS CANCELLED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 3076 8559 3050 8524 3029 8552 3032 8554
      3032 8552 3033 8554 3036 8555 3036 8556
      3069 8575
TIME...MOT...LOC 2249Z 326DEG 20KT 3057 8555 

$$

11-MOORE

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 Aug 7, 3:30 PM CDT, 2 hours 1 minute earlier.

Area forecast discussion, Aug 7, 3:30 PM CDT, 2 hours 1 minute before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TALLAHASSEE FL
430 PM EDT FRI AUG 7 2015

.Near Term [Through Tonight]...

A 16Z analysis shows the surface front across the southern half of
Alabama and Georgia. Thunderstorms are already firing along a
surface trough  that stretches from Perry to southeastern Georgia.
There is also a cluster of storms in southern Alabama that is moving
to the southeast. With wind shear values higher than normal for
summer, we still expect some strong to severe storms through this
evening. The PoP coverage for tonight will range from 20 to 40% with
the highest chances in the western part of our area. Lows tonight
will be in the mid 70s.

.Short Term [Saturday Through Sunday Night]...

In the upper levels, a trough is just off of the Atlantic Coast
and a ridge is building in from the west. At the sfc, low pressure
will be just off the Mid-Atlantic Coast with a cool front moving
through the region on Saturday morning. On Saturday afternoon, the
best chance for rain and thunder will be in the southern half of
the region (POPs around 30 percent) particularly near the coast as
the cool front stalls just south of the region. On Sunday, expect
isolated showers and thunderstorms mainly along the seabreeze
boundary as the front moves out of the region. Highs will be in
the mid 90s on Saturday and upper 90s on Sunday. Heat indices will
range from 100 to 105 degrees on Saturday and 105 to 110 degrees
on Sunday. Lows will be in the mid 70s.

.Long Term [Monday Through Friday]...

In the upper levels, ridging will be in place early in the
workweek. By Wednesday, a trough will dig into the region from the
north. At the sfc, features will be weak until Tuesday when
another slow-moving cool front will approach the region and move
through on Wednesday. On Monday, a more typical summertime pattern
will bring typical afternoon showers and thunderstorms. On Tuesday
and Wednesday, the chance for showers and thunderstorms will
increase as the cool front approaches and moves through. The best
chance for rain will be Wednesday afternoon and evening
particularly in the Florida Big Bend area. Increased rain chances
will linger in the Big Bend area on Thursday and Friday as the
front stalls south of the region. On Monday and Tuesday, highs
will be in mid 90s with heat indices ranging from 103 to 110
degrees. By Wednesday, highs will be in the low 90s. By Thursday,
drier air will move in bringing some relief to the heat.

&&

.Aviation...
[Through 18Z Saturday]

Thunderstorms are expected at all terminals this afternoon and
evening. TLH, ABY and VLD already have MVFR cloud decks. Included
tempo groups for gusty winds and reduced visibilites.

&&

.Marine...

Winds will be westerly 15 to 20 knots overnight. Late Saturday
morning winds will subside to around 15 knots and decrease further
after sunset. Seas will be 3 to 4 feet through Saturday eveining.
Light winds and lower seas will be in place by Sunday.

&&

.Fire Weather...

Hot and humid conditions with chances for showers and thunderstorms
will prevent any fire weather concerns.

&&

.Hydrology...

Scattered showers and thunderstorms are expected across the
region this evening. With most area rivers at normal or below
normal levels, widespread river flooding is not expected.

&&

.Preliminary Point Temps/PoPs...

Tallahassee   77  96  76  98  77 /  30  30  10  30  20
Panama City   81  91  77  91  80 /  40  30  10  30  20
Dothan        75  96  76  98  76 /  30  30  10  20  10
Albany        74  96  75  97  76 /  20  20  10  10  10
Valdosta      74  96  75  97  75 /  20  20  10  30  20
Cross City    77  92  75  94  76 /  40  30  30  40  20
Apalachicola  80  90  77  90  79 /  40  30  10  30  20

&&

.TAE WATCHES/WARNINGS/ADVISORIES...
FL...HIGH RIP CURRENT RISK through late tonight FOR Coastal Bay-
     Coastal Franklin-Coastal Gulf-South Walton.

GA...NONE.
AL...NONE.
GM...NONE.
&&

NEAR TERM...WESTON
SHORT TERM...MCDERMOTT
LONG TERM...MCDERMOTT
AVIATION...WESTON
MARINE...MCDERMOTT
FIRE WEATHER...MOORE
HYDROLOGY...MCDERMOTT

In the hours before

Local storm report, Aug 7, 3:01 PM CDT, 2 hours 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
401 PM EDT FRI AUG 07 2015

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

0333 PM     TSTM WND DMG     SW ECHO                 31.47N 85.47W
08/07/2015                   DALE               AL   911 CALL CENTER

            TREES DOWN ON EAST COUNTY RD 36.

&&

EWESTON

Local storm report, Aug 7, 3:42 PM CDT, 1 hour 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
442 PM EDT FRI AUG 07 2015

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

0330 PM     TSTM WND DMG     3 WNW VALDOSTA          30.86N 83.32W
08/07/2015                   LOWNDES            GA   PUBLIC

            LARGE TREE ON HOUSE ON GORNTO RD.

&&

EWESTON

Local storm report, Aug 7, 4:18 PM CDT, 1 hour 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
518 PM EDT FRI AUG 07 2015

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

0333 PM     TSTM WND DMG     SKIPPERVILLE            31.56N 85.55W
08/07/2015                   DALE               AL   911 CALL CENTER

            TREE DOWN AT COUNTY ROAD 67 AND COUNTY RD 339.

&&

EWESTON

Local storm report, Aug 7, 4:34 PM CDT, 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
534 PM EDT FRI AUG 07 2015

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

0508 PM     TSTM WND DMG     5 SSE DONALSONVILLE     30.97N 84.86W
08/07/2015                   SEMINOLE           GA   911 CALL CENTER

             SHED DESTORYED NEAR HIGHWAY 285 EAST OF HIGHWAY 39.

&&

EWESTON

Local storm report, Aug 7, 4:57 PM CDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
557 PM EDT FRI AUG 07 2015

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

0339 PM     TSTM WND DMG     4 E VALDOSTA            30.84N 83.22W
08/07/2015                   LOWNDES            GA   EMERGENCY MNGR

            ONE RESIDENCE HAD 6 TO 7 TREES BLOWN DOWN AND MANY
            SHINGLES BLOWN OFF ROOF.

&&

MCDERMOTT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 3:34 PM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Lafayette, Madison, Taylor	27 min
Aug 7, 3:50 PM CDT	Severe Thunderstorm Warning	TAE	Madison, Taylor	40 min
Aug 7, 3:51 PM CDT	Severe Thunderstorm Warning	TAE	Jackson	39 min
Aug 7, 4:09 PM CDT	Severe Thunderstorm Warning	TAE	Holmes, Walton	51 min
Aug 7, 4:19 PM CDT	Severe Thunderstorm Warning	TAE	Holmes	41 min
Aug 7, 4:21 PM CDT	Severe Thunderstorm Warning	TAE	Gadsden	21 min
Aug 7, 4:35 PM CDT	Severe Thunderstorm Warning	TAE	Gadsden, Leon, Wakulla	6 min
Aug 7, 4:36 PM CDT	Severe Thunderstorm Warning	TAE	Dixie, Lafayette, Taylor	39 min
Aug 7, 4:42 PM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Leon	15 min
Aug 7, 4:44 PM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Leon	31 min
Aug 7, 4:52 PM CDT	Severe Thunderstorm Warning	TAE	Bay, Holmes, Jackson, Walton, Washington	38 min
Aug 7, 4:56 PM CDT	Severe Thunderstorm Warning	TAE	Jefferson	19 min
Aug 7, 4:58 PM CDT	Severe Thunderstorm Warning	TAE	Gadsden, Leon, Liberty, Wakulla	47 min
Aug 7, 5:04 PM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Wakulla	12 min
Aug 7, 5:25 PM CDT	Severe Thunderstorm Warning	TAE	Bay, Walton, Washington	50 min
Aug 7, 5:38 PM CDT	Severe Thunderstorm Warning	TAE	Franklin, Gadsden, Jefferson, Leon, Liberty, Wakulla	52 min
Aug 7, 5:54 PM CDT	Special Marine Warning	TAE		51 min
Aug 7, 6:04 PM CDT	Special Marine Warning	TAE		56 min
Aug 7, 6:10 PM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Taylor	35 min
Aug 7, 6:19 PM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Lafayette, Madison, Taylor	23 min
Aug 7, 6:29 PM CDT	Severe Thunderstorm Warning	TAE	Franklin, Liberty, Wakulla	16 min
Aug 7, 6:40 PM CDT	Special Marine Warning	TAE		65 min
Aug 7, 6:55 PM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Lafayette, Madison, Taylor	50 min

Nearby

Severe Thunderstorm Warnings in Florida, 2015 Every severe thunderstorm warning in 2015

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.