Alert archive / Florida / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 83, NWS Tallahassee, FL

April 11, 2013Jackson County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Apr 11, 2013, 10:37 PM CDT for Jackson County, Florida. It was in force for 38 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: Apr 11, 2013, 10:37 PM CDT (03:37 UTC)
Expired: Apr 11, 2013, 11:15 PM CDT
In force: 38 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon

County Jackson County, FL

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 11, 7:24 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 3.6 hours before the alert went out and 95 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: 1304 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 521 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

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

515 
WUUS52 KTAE 120337
SVRTAE
FLC063-120415-
/O.NEW.KTAE.SV.W.0083.130412T0337Z-130412T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1037 PM CDT THU APR 11 2013

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN JACKSON COUNTY IN THE PANHANDLE OF FLORIDA...

* UNTIL 1115 PM CDT

* AT 1030 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 8 MILES WEST OF MARIANNA...OR NEAR
  COTTONDALE AIRPORT...AND MOVING NORTHEAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SILLS...MARIANNA MUNICIPAL A/P...CHIPOLA TERRACE...BLUE SPRING...
  GREENWOOD...MALONE...TWO EGG...BASCOM...DELLWOOD...LOVEDALE...BUENA
  VISTA...HORNSVILLE AND HAYNES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY. PEOPLE OUTSIDE SHOULD MOVE INSIDE A STRONG BUILDING BUT
AWAY FROM WINDOWS.

&&

LAT...LON 3098 8531 3100 8524 3100 8500 3098 8501
      3096 8498 3094 8498 3089 8494 3084 8493
      3082 8494 3076 8491 3069 8543 3085 8544
TIME...MOT...LOC 0338Z 242DEG 41KT 3082 8528

$$

42-DVD

2 follow-up statements

133 
WWUS52 KTAE 120348
SVSTAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1048 PM CDT THU APR 11 2013

FLC063-120415-
/O.CON.KTAE.SV.W.0083.000000T0000Z-130412T0415Z/
JACKSON FL-
1048 PM CDT THU APR 11 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR NORTHEASTERN JACKSON COUNTY...

AT 1043 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR GREENWOOD...MOVING
NORTHEAST AT 45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
MALONE...TWO EGG...BASCOM...DELLWOOD...LOVEDALE...BUENA VISTA...
HORNSVILLE AND HAYNES

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT FRIDAY MORNING FOR
SOUTHEAST ALABAMA AND NORTHWEST FLORIDA AND SOUTHWESTERN GEORGIA.

&&

LAT...LON 3096 8528 3100 8524 3100 8500 3098 8501
      3089 8494 3084 8494 3080 8497 3076 8531
      3084 8534
TIME...MOT...LOC 0348Z 242DEG 41KT 3090 8514

$$

42-DVD

742 
WWUS52 KTAE 120401
SVSTAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1101 PM CDT THU APR 11 2013

FLC063-120411-
/O.CAN.KTAE.SV.W.0083.000000T0000Z-130412T0415Z/
JACKSON FL-
1101 PM CDT THU APR 11 2013

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN JACKSON COUNTY IS
CANCELLED...

RELAY REPORTS OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE IN
TALLAHASSEE AT (8 5 0) 9 4 2 8 8 3 3. OR...YOU MAY CONTACT THE
NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT.
THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT FRIDAY MORNING FOR
SOUTHEAST ALABAMA AND NORTHWEST FLORIDA AND SOUTHWESTERN GEORGIA.

LAT...LON 3096 8528 3100 8524 3100 8500 3098 8501
      3089 8494 3084 8494 3080 8497 3076 8531
      3084 8534
TIME...MOT...LOC 0401Z 242DEG 41KT 3097 8499

$$

42-DVD

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 Apr 11, 7:22 PM CDT, 3 hours 15 minutes earlier.

Area forecast discussion, Apr 11, 7:22 PM CDT, 3 hours 15 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TALLAHASSEE FL
822 PM EDT Thu Apr 11 2013

.NEAR TERM [Rest of Tonight]...
Currently monitoring the line associated with a cold front that
will be moving through the area tonight. KMOB radar shows a Line
Echo Wave Pattern developing just offshore with strong storms
showing some bowing signatures from the coastline north to I-10.
Some mesocyclones have been detected downstream of our CWA and we
are anticipating that our western counties will see the potential
for strong to severe wind gusts associated with these storms and
isolated tornadoes. 00Z TAE sounding shows this morning's capping
inversion has been broken, however there is still a fairly warm
layer that may act to reduce updrafts and potentially limit a
widespread severe event. Severe wind gusts and isolated tornado
threat will still be possible near any isolated deeper mesos that
may form. Rainfall should come to an end by the pre-dawn hours for
our most western zones and will exit the eastern areas by late
morning tomorrow.

&&

.SHORT TERM [Friday Through Saturday Night]...
Although the threat for severe weather should be just about done by
Friday morning, some of the latest indications in the models are
showing that the tail end of the Cold Front may be a bit slow to
exit our region on Friday, especially during the first half of the
day. Therefore, we are keeping a 20-50 percent PoP gradient from NW
to SE across the CWA from 12-18 UTC, with just 20-30 percent rain
chances after 18 UTC for extreme eastern portions of the area. Only
slightly cooler air will filter in behind the front, with High Temps
still in the 75 to 80 degree range. It will be noticeably cooler over
much of the area Friday night, with Lows ranging from the mid 40s
over parts of SE AL, to the mid to upper 50s across the SE FL Big
Bend. This will set up a fair and seasonably warm day for Saturday,
before the next disturbance begins to head our way by late Saturday
night, setting up a potential wet period described below.

&&

.LONG TERM [Sunday through Thursday]...
After a quiet start to the weekend, it appears that more wet weather
is on the way for Sunday into Monday, as an Upper Level disturbance
and a weak Sfc Wave move NE into our region from the Gulf of Mexico.
Although no strong or severe storms are expected with this system,
it could be a fairly prolific rainfall producer as plenty of Deep
Layer moisture enhances a favorable setup for isentropic lift. This
Low Pressure system should exit our region on Monday night and
Tuesday, with a stretch of quite warm and humid conditions expected
for the remainder of the period. High temps will likely reach well
into the middle 80s.

&&

.Aviation [Through 00z Friday]...
Conditions will be quickly deteriorating tonight. Scattered
thunderstorms will be moving into the area from the west after 2Z.
These storms could produce strong winds in excess of 35 kts which
will impact all of our terminals some time during the overnight and
morning hours. Front will pass by late morning and conditions will
return to VFR.

&&

.MARINE...
Low end Small Craft Advisory Conditions outside of Apalachee Bay
tonight, with some higher gusts likely in and around any strong to
severe thunderstorms. Winds will diminish behind the front on
Friday as they shift from onshore to offshore, with a possible
northeasterly surge back to Cautionary levels on Friday night.
Thereafter, light to moderate winds and seas should be the rule

&&

.FIRE WEATHER...
Rain and thunderstorms will move across the region from west to east
tonight ahead of a cold front.  This will wet small fuels and likely
hinder fire weather concerns for the near future, although drier air
will arrive behind the front for Friday and the weekend. RH will
likewise drop to below 30 percent on Saturday afternoon. Winds
will be too light to reach red flag criteria in FL and durations
will be too brief even if ERC values can rebound sufficiently after
the upcoming wetting rains.

&&

.HYDROLOGY...
Despite some locally heavy rainfall possible in some of the stronger
storms, the progressive nature of this Cold Front tonight should
preclude any major river rises. However, the next Low Pressure
system on Sunday and Monday does have more potential to produce
widespread heavy rainfall, so it will be monitored closely over the
next few days.

&&

.PRELIMINARY POINT TEMPS/POPS...
Tallahassee   69  80  53  83  54 /100  50  10   0  20
Panama City   63  76  57  79  59 /100  30  10   0  20
Dothan        58  75  49  81  50 /100  20   0   0  10
Albany        63  78  49  81  50 /100  30  10   0  10
Valdosta      68  80  53  82  51 /100  50  10   0  10
Cross City    69  80  59  82  56 / 50  50  20  10  20
Apalachicola  69  76  58  77  60 /100  50  10   0  20

&&

.TAE WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AL...None.
GM...SMALL CRAFT ADVISORY until 8 AM EDT Friday for Coastal Waters
     From Ochlockonee River to Apalachicola Fl out to 20 Nm-
     Coastal waters from Apalachicola to Destin FL out 20 NM-
     Waters from Suwannee River to Apalachicola FL from 20 to
     60 NM-Waters from Apalachicola to Destin FL from 20 to 60
     NM.
&&

NEAR TERM/AVIATION/MARINE...Walsh/Godsey
SHORT TERM...Gould
LONG TERM...Gould
MARINE...Gould
FIRE WEATHER...Evans
HYDROLOGY...Gould

Hazardous weather outlook, Apr 11, 8:00 PM CDT, 2 hours 37 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TALLAHASSEE FL
900 PM EDT THU APR 11 2013

ALZ065>069-FLZ007>019-026>029-034-108-112-114-115-118-127-128-134-
GAZ120>131-142>148-155>161-GMZ730-750-755-765-770-775-130100-
COFFEE-DALE-HENRY-GENEVA-HOUSTON-INLAND WALTON-CENTRAL WALTON-
HOLMES-WASHINGTON-JACKSON-INLAND BAY-CALHOUN-INLAND GULF-
INLAND FRANKLIN-GADSDEN-LEON-INLAND JEFFERSON-MADISON-LIBERTY-
INLAND WAKULLA-INLAND TAYLOR-LAFAYETTE-INLAND DIXIE-SOUTH WALTON-
COASTAL BAY-COASTAL GULF-COASTAL FRANKLIN-COASTAL JEFFERSON-
COASTAL WAKULLA-COASTAL TAYLOR-COASTAL DIXIE-QUITMAN-CLAY-
RANDOLPH-TERRELL-DOUGHERTY-LEE-WORTH-TURNER-TIFT-BEN HILL-IRWIN-
EARLY-MILLER-BAKER-MITCHELL-COLQUITT-COOK-BERRIEN-SEMINOLE-
DECATUR-GRADY-THOMAS-BROOKS-LOWNDES-LANIER-
APALACHEE BAY OR COASTAL WATERS FROM KEATON BEACH TO OCHLOCKONEE
RIVER FL OUT TO 20 NM-
COASTAL WATERS FROM APALACHICOLA TO DESTIN FL OUT 20 NM-
COASTAL WATERS FROM  OCHLOCKONEE RIVER TO APALACHICOLA FL OUT TO
20 NM-
COASTAL WATERS FROM  SUWANNEE RIVER TO KEATON BEACH OUT 20 NM-
WATERS FROM APALACHICOLA TO DESTIN FL FROM 20 TO 60 NM-
WATERS FROM  SUWANNEE RIVER TO APALACHICOLA FL FROM 20 TO 60 NM-
900 PM EDT THU APR 11 2013 /800 PM CDT THU APR 11 2013/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST ALABAMA...
SOUTHWEST AND SOUTH CENTRAL GEORGIA...AND THE FLORIDA BIG BEND
AND PANHANDLE...AND ADJACENT COASTAL WATERS.

.DAY ONE...TONIGHT...
A LINE OF THUNDERSTORMS WILL BE MOVING THROUGH THE AREA LATE TONIGHT.
THESE STORMS WILL BE CAPABLE OF PRODUCING DAMAGING WINDS AND
ISOLATED TORNADOES.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...
THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. SHOWERS
AND THUNDERSTORMS WILL CONTINUE EARLY ON FRIDAY BY THE OVERALL
SEVERE THREAT WILL BE GREATLY DIMINISHED. THE FRONT WILL SLOW DOWN
AS IT TRAVERSES THE AREA...SO THE LAST OF THE STORM MAY NOT EXIT
EAST OF THE SUWANNEE RIVER UNTIL FRIDAY EVENING. AFTER A BRIEF
DRYING OUT ON SATURDAY...THUNDERSTORMS WILL RETURN TO THE FORECAST
FOR SUNDAY THROUGH WEDNESDAY. THE OVERALL SEVERE THREAT DURING
THIS PERIOD APPEARS MINIMAL.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS REQUESTED OVERNIGHT.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE
WEBSITE ON THE INTERNET AT WEATHER.GOV...THEN CLICK ON YOUR AREA
OF INTEREST ON THE NATIONAL MAP.

WALSH/GODSEY

In the hours before

Local storm report, Apr 11, 9:46 PM CDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1046 PM EDT THU APR 11 2013

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

1030 PM     TSTM WND DMG     OZARK                   31.45N 85.65W
04/11/2013                   DALE               AL   911 CALL CENTER

            TREE DOWN ACROSS THE HIGHWAY NEAR OZARK. CAUSED A VEHICLE
            ACCIDENT. NO INJURIES.

&&

GODSEY

Local storm report, Apr 11, 9:48 PM CDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1048 PM EDT THU APR 11 2013

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

1030 PM     TSTM WND DMG     EUCHEEANNA              30.65N 86.05W
04/11/2013                   WALTON             FL   TRAINED SPOTTER

            ROOF OF WORKSHOP PEELED BACK DUE TO WIND DAMAGE

&&

EH

Local storm report, Apr 11, 10:12 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1112 PM EDT THU APR 11 2013

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

1102 PM     TSTM WND DMG     1 W ABBEVILLE           31.57N 85.27W
04/11/2013                   HENRY              AL   EMERGENCY MNGR

            TREE DOWN WEST OF ABBEVILLE ON HIGHWAY 10.

&&

GODSEY

Local storm report, Apr 11, 10:22 PM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1122 PM EDT THU APR 11 2013

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

1105 PM     TSTM WND DMG     DOTHAN                  31.22N 85.39W
04/11/2013                   HOUSTON            AL   EMERGENCY MNGR

            NUMEROUS TREES AND POWERLINES REPORTED DOWN AROUND DOTHAN
            AND NORTHERN HOUSTON COUNTY.

&&

GODSEY

Local storm report, Apr 11, 10:25 PM CDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1125 PM EDT THU APR 11 2013

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

0938 PM     TSTM WND DMG     2 SSW LOCKHART          30.99N 86.36W
04/11/2013                   WALTON             FL   LAW ENFORCEMENT

            TREE DOWN ON 1 BRIDGE ROAD, LAUREL HILL, FL.

&&

EH

Special weather statement, Apr 11, 10:30 PM CDT, 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1130 PM EDT THU APR 11 2013

FLZ010>013-112-114-120430-
CALHOUN FL-JACKSON FL-INLAND BAY FL-COASTAL GULF FL-COASTAL BAY
FL-WASHINGTON FL-
1030 PM CDT THU APR 11 2013

...SIGNIFICANT WEATHER ADVISORY IN EFFECT FOR BAY...CALHOUN...GULF...
JACKSON AND WASHINGTON COUNTIES...

* UNTIL 1130 PM CDT/1230 AM EDT/

AT 1025 PM CDT...THE NATIONAL WEATHER SERVICE HAS DETECTED STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES EAST OF CHIPLEY TO
8 MILES SOUTHWEST OF PANAMA CITY BEACH...OR ALONG A LINE EXTENDING
FROM COTTONDALE TO 8 MILES SOUTHWEST OF BAHAMA BEACH...MOVING EAST AT
25 MPH.

WINDS 40 TO 50 MPH ARE EXPECTED WITH THESE STORMS.

LAT...LON 3087 8543 3090 8495 3076 8492 3071 8487
      3020 8522 3020 8539 3002 8539 2997 8537
      2993 8540 2996 8551 3005 8560 3009 8570
      3022 8590
TIME...MOT...LOC 0330Z 265DEG 23KT 3080 8538 3011 8588

42-DVD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 8:25 PM CDT	Severe Thunderstorm Warning	TAE	Holmes, Walton	65 min
Apr 11, 8:29 PM CDT	Special Marine Warning	TAE		2 hr
Apr 11, 9:26 PM CDT	Severe Thunderstorm Warning	TAE	Bay, Holmes, Walton, Washington	64 min
Apr 11, 10:23 PM CDT	Special Marine Warning	TAE		2 hr
Apr 11, 10:30 PM CDT	Special Weather Statement	TAE	Bay, Calhoun, Jackson	60 min
Apr 12, 12:22 AM CDT	Special Marine Warning	TAE		83 min
Apr 12, 1:33 AM CDT	Special Marine Warning	TAE		57 min
Apr 12, 2:18 AM CDT	Special Marine Warning	TAE		57 min
Apr 12, 3:10 AM CDT	Special Marine Warning	TAE		65 min

Nearby

Severe Thunderstorm Warnings in Florida, 2013 Every severe thunderstorm warning in 2013

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.