Alert archive / Florida / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 93, NWS Tallahassee, FL

February 7, 20174 counties in Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Feb 7, 2017, 6:30 PM EST for 4 counties in Florida. It was in force for 60 min. 7 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Feb 7, 2017, 6:30 PM EST (23:30 UTC)
Expired: Feb 7, 2017, 7:30 PM EST
In force: 60 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Franklin County, FL, Jefferson County, FL, Leon County, FL, Wakulla County, FL

The radar

The Tallahassee radar (KTLH), 38 km from the middle of the area, began a volume at 23:29 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.

What was reported inside it

Time	Report	Where	Remark
Feb 7, 7:00 PM EST	TSTM WND DMG	1 Sw Tallahassee Coml A, FL	TREE AND POWERLINE REPORTED DOWN
Feb 7, 7:00 PM EST	TSTM WND DMG	2 Sw Woodville, FL	POWER LINES DOWN ON BOB MILLER RD
Feb 7, 7:00 PM EST	TSTM WND DMG	3 Wsw Woodville, FL	LARGE TREE SNAPPED
Feb 7, 7:00 PM EST	TSTM WND DMG	3 W Woodville, FL	TREE DOWN ACROSS WAKULLA SPRINGS ROAD
Feb 7, 7:00 PM EST	TSTM WND DMG	4 Wsw Woodville, FL	A LARGE TREE SNAPPED.
Feb 7, 7:00 PM EST	TSTM WND DMG	Nnw Chaires Crossroads, FL	TREE REPORTED DOWN IN INTERSECTION
Feb 7, 7:04 PM EST	TSTM WND DMG	4 E Crawfordville, FL	TREE FELL AND CAUSED ROOF DAMAGE TO A HOUSE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 8 storm reports to this severe thunderstorm warning; the first came 30 minutes after it went out.

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
Feb 7, 5:33 PM EST	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 11.5 hours before the alert went out and 36 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: 10 J/kg
Mixed-layer CIN: -140 J/kg
Mixed-layer LCL: 1140 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

584 
WUUS52 KTAE 072330
SVRTAE
FLC037-065-073-129-080030-
/O.NEW.KTAE.SV.W.0093.170207T2330Z-170208T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tallahassee FL
630 PM EST TUE FEB 7 2017

The National Weather Service in Tallahassee has issued a

* Severe Thunderstorm Warning for...
  Northeastern Franklin County in Big Bend of Florida...
  Jefferson County in Big Bend of Florida...
  Leon County in Big Bend of Florida...
  Wakulla County in Big Bend of Florida...

* Until 730 PM EST

* At 629 PM EST, a severe thunderstorm was located 15 miles southwest
  of Midway, moving east at 50 mph.

  HAZARD...70 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings. 

* Locations impacted include...
  Monticello, Woodville, Crawfordville, Tallahassee, St. Marks, Doak
  Campbell Stadium, Florida State University, Tallahassee Comm
  College, Florida A And M, Wakulla, Sopchoppy, Casa Blanco, Bethel,
  Montivilla, Waukeenah, State Capital Complex, Lloyd, Eight Mile
  Pond, Tallahassee Mall and Newport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. This storm is producing widespread
wind damage across the Florida Panhandle. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows!

&&

LAT...LON 2968 8469 3068 8424 3065 8361 3058 8360
      3052 8373 3043 8372 3038 8376 3038 8381
      3032 8379 3024 8392 3015 8397 3008 8400
      3002 8389 2998 8397 3003 8405 2999 8425
      2986 8429 2981 8450
TIME...MOT...LOC 2329Z 270DEG 42KT 3034 8466 

HAIL...<.75IN
WIND...70MPH
 
$$

30-PULLIN

1 follow-up statement

651 
WWUS52 KTAE 080001
SVSTAE

Severe Weather Statement
National Weather Service Tallahassee FL
701 PM EST TUE FEB 7 2017

FLC037-065-073-129-080030-
/O.CON.KTAE.SV.W.0093.000000T0000Z-170208T0030Z/
Franklin FL-Jefferson FL-Leon FL-Wakulla FL-
701 PM EST TUE FEB 7 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EST
FOR NORTHEASTERN FRANKLIN...JEFFERSON...LEON AND WAKULLA COUNTIES...

At 700 PM EST, a severe thunderstorm was located near Woodville,
moving east at 50 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Monticello, Woodville, Crawfordville, Tallahassee, St. Marks, Doak
Campbell Stadium, Florida State University, Tallahassee Comm College,
Florida A And M, Wakulla, Sopchoppy, Casa Blanco, Bethel, Montivilla,
Waukeenah, State Capital Complex, Lloyd, Eight Mile Pond, Tallahassee
Mall and Newport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. This storm has a history of producing
widespread wind damage across the Florida Panhandle this evening.
Seek shelter now inside a sturdy structure and stay away from
windows.

&&

LAT...LON 2968 8469 3068 8424 3065 8361 3058 8360
      3052 8373 3043 8372 3038 8376 3038 8381
      3032 8379 3024 8392 3015 8397 3008 8400
      3002 8389 2998 8397 3003 8405 2999 8425
      2986 8429 2981 8450
TIME...MOT...LOC 0000Z 270DEG 42KT 3034 8424 

HAIL...<.75IN
WIND...60MPH
 
$$

30-PULLIN

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 Feb 7, 3:27 PM EST, 3 hours 3 minutes earlier.

Area forecast discussion, Feb 7, 3:27 PM EST, 3 hours 3 minutes before

Area Forecast Discussion
National Weather Service Tallahassee FL
327 PM EST Tue Feb 7 2017

.NEAR TERM [Through Tonight]...

Summary: The threat for severe weather will increase this afternoon
through the evening hours. The best chance of seeing any severe
weather is across portions of the Florida panhandle and southeast
Alabama, although isolated severe weather is possible across the
entire area. The main threats are damaging wind gusts and large hail
with localized impacts to trees and power lines, although an
isolated tornado or two cannot be ruled out.

Analysis:  This afternoon's water vapor imagery shows the base of a
vigorous upper level shortwave is now moving through eastern
Louisiana and southern Mississippi. Ahead of it, the environment
has destabilized fairly significantly for this time of year with
SBCAPE values over 1500 j/kg extending well inland into southeast
Alabama and southern Georgia per the 18z SPC mesoanalysis. Shear
values are still fairly low in our area, but shear is higher to the
west across portions of southwest Alabama and southern Mississippi,
and this airmass is forecast to move eastward through the evening
hours. The RAP runs today have remain consistent in showing a
stronger low level jet than the NAM, GFS, or ECMWF, and looking at
the velocities from the KMOB radar, the RAP may be closer to the
truth. Thus, there remains a threat of severe storms across the
entire area through the evening hours. The greatest threat continues
to be across the western half of the area. SPC has extended the
slight risk area eastward a bit compared to this morning's outlook,
which makes sense given the more impressive appearance to the system
than this morning. The CAM guidance continues to suggest a QLCS will
move into the area with some CAMs explicitly showing 50 knot gusts
or higher. Most of the activity should be out of the area by
midnight with the potential for areas of fog to develop in its wake
late tonight.

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

Southwesterly flow will continue from Wednesday through Wednesday
night across our area as an upper level trough approaches our area
from the northwest. However, in the wake of the MCS that will
have moved through our area the previous night, a fairly stable
airmass will be in place over inland regions early Wednesday,
resulting in dry conditions during the morning and early afternoon.
Moisture is expected to gradually increase from south to north
during the afternoon and evening hours, with PWAT values
increasing to 1.0-1.5". A cold front will then move across our
area overnight, with best chances of showers and isolated
thunderstorms from Tallahassee east through the FL Big Bend and
south central GA. Cooler and much drier air will move into our
area on Thursday, with clear skies and highs in the mid 60s to
lower 70s. Lows Thursday night will dip into the mid-upper 30s
inland, with 40s along the Gulf Coast.

.LONG TERM [Friday Through Tuesday]...

The upper level trough mentioned in the short term discussion will
move to our east on Friday, and will be replaced by an upper ridge
over the eastern CONUS from the weekend through early next week.
With a broad area of high pressure at the surface, expect dry
conditions to prevail throughout this period. Seasonably cool
conditions on Friday (highs in the 60s, lows in the 40s) will
quickly give way to warmer than normal temperatures through the
weekend and early next week. Highs in the 70s and lows in the 50s
are expected from Saturday through Tuesday.

&&

.AVIATION [Through 18Z Wednesday]...

A line of showers and thunderstorms will cross the area from west
to east through this evening. A few storms may be severe with hail
and strong winds. Once the squall line passes, low ceilings and
areas of fog will be possible late tonight with IFR to LIFR
conditions possible. Only a slow improvement is expected on
Wednesday morning.

&&

.MARINE...

A line of thunderstorms, possibly strong to severe, will move
through our marine zones this evening. Strong wind gusts and
frequent lightning will accompany the storms. Otherwise, expect
winds generally around 10 to 15 knots and seas of 2 to 3 feet
through the next few days.

&&

.FIRE WEATHER...

In the wake of showers and isolated thunderstorms Wednesday, much
drier air is expected on Thursday. Strong transport winds will lead
to high dispersions across much of the area. RH values will stay
above the threshold for red flag conditions.

&&

.HYDROLOGY...

Some heavy rain is possible this evening with the thunderstorms,
but storms will likely be moving too quickly to pose a significant
flooding threat. No heavy rain is anticipated from Wednesday
through the next several days.

&&

.PRELIMINARY POINT TEMPS/POPS...

Tallahassee   59  77  62  70  37 /  90  10  30   0   0
Panama City   64  71  63  67  43 /  80  20  20   0   0
Dothan        59  75  56  64  36 /  80  10  20   0   0
Albany        59  75  58  65  35 /  90  10  20   0   0
Valdosta      58  76  61  70  37 /  90  20  30  10   0
Cross City    60  76  63  74  38 /  80  20  30  10   0
Apalachicola  62  71  63  70  44 /  80  20  20   0   0

&&

.TAE WATCHES/WARNINGS/ADVISORIES...

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

&&

NEAR TERM...DVD
SHORT TERM...Lahr
LONG TERM...Lahr
AVIATION...DVD
MARINE...Lahr
FIRE WEATHER...Scholl
HYDROLOGY...Lahr

In the hours before

Local storm report, Feb 7, 5:50 PM EST, 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
550 PM EST TUE FEB 07 2017

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

0522 PM     NON-TSTM WND DMG HILAND PARK             30.20N 85.63W
02/07/2017                   BAY                FL   911 CALL CENTER

            DISTPATCH REPORTS NUMEROUS POWER LINES DOWN OVER MUCH OF
            COUNTY

&&

RH

Local storm report, Feb 7, 5:54 PM EST, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
554 PM EST TUE FEB 07 2017

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

0457 PM     TSTM WND DMG     FREEPORT                30.50N 86.14W
02/07/2017                   WALTON             FL   PUBLIC

            TREES REPORTED DOWN IN FREEPORT

&&

RH

Local storm report, Feb 7, 6:04 PM EST, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
604 PM EST TUE FEB 07 2017

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

0530 PM     TSTM WND DMG     5 SSW PINCKARD          31.24N 85.58W
02/07/2017                   HOUSTON            AL   BROADCAST MEDIA

            LOCAL MEDIA RELAYED REPORT OF DAMAGE TO HOME

&&

RH

Local storm report, Feb 7, 6:11 PM EST, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
611 PM EST TUE FEB 07 2017

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

0533 PM     TSTM WND DMG     3 NNE COTTONDALE        30.84N 85.36W
02/07/2017                   JACKSON            FL   LAW ENFORCEMENT

            TREES DOWN ALONG SR-73 AND US231

&&

RH

Local storm report, Feb 7, 6:20 PM EST, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
620 PM EST TUE FEB 07 2017

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

0542 PM     TSTM WND DMG     MARIANNA                30.77N 85.24W
02/07/2017                   JACKSON            FL   911 CALL CENTER

            REPORT OF TREE DOWN ON HOUSE AND CAR IN MARIANNA AND
            ALFORD

&&

RH

Local storm report, Feb 7, 6:30 PM EST, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
630 PM EST TUE FEB 07 2017

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

0600 PM     TSTM WND DMG     FRINK                   30.37N 85.21W
02/07/2017                   CALHOUN            FL   911 CALL CENTER

            CALL CENTER REPORTS TREES AND POWER LINES DOWN OVER MUCH
            OF COUNTY

&&

RH

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 7, 4:18 PM EST	Special Marine Warning	TAE		117 min
Feb 7, 4:31 PM EST	Severe Thunderstorm Warning	TAE	Walton	59 min
Feb 7, 4:50 PM EST	Severe Thunderstorm Warning	TAE	Holmes, Walton, Washington	55 min
Feb 7, 5:07 PM EST	Severe Thunderstorm Warning	TAE	Bay, Washington	53 min
Feb 7, 5:14 PM EST	Severe Thunderstorm Warning	TAE	Holmes, Jackson	46 min
Feb 7, 5:26 PM EST	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Gadsden, Jackson, Liberty, Washington	64 min
Feb 7, 5:42 PM EST	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Franklin, Gulf	48 min
Feb 7, 5:46 PM EST	Severe Thunderstorm Warning	TAE	Jackson	44 min
Feb 7, 5:56 PM EST	Special Marine Warning	TAE		49 min
Feb 7, 6:08 PM EST	Severe Thunderstorm Warning	TAE	Franklin, Gadsden, Gulf, Leon, Liberty, Wakulla	67 min
Feb 7, 6:18 PM EST	Severe Thunderstorm Warning	TAE	Franklin, Gulf	42 min
Feb 7, 6:26 PM EST	Special Marine Warning	TAE		2 hr
Feb 7, 6:53 PM EST	Severe Thunderstorm Warning	TAE	Franklin, Gulf	37 min

Nearby

Severe Thunderstorm Warnings in Florida, 2017 Every severe thunderstorm warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.