Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 189, NWS Tallahassee, FL

July 22, 2018Bay County, Walton County, Washington County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Jul 22, 2018, 8:29 PM CDT for Bay County, Walton County, Washington County, Florida. It was in force for 35 min. 1 report 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: Jul 22, 2018, 8:29 PM CDT (01:29 UTC)
Expired: Jul 22, 2018, 9:04 PM CDT
In force: 35 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Bay County, FL, Walton County, FL, Washington County, FL

The radar

The Eglin Afb radar (KEVX), 16 km from the middle of the area, began a volume at 01:32 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
Jul 22, 8:30 PM CDT	TSTM WND DMG	3 W Bruce, FL	TREE DOWN ON HIGHWAY 20 BLOCKED THE ROAD.

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 one storm report to this severe thunderstorm warning; the first came 1 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
Jul 22, 10:15 AM CDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 1.5 hours before the alert went out and 169 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: 1072 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 1007 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 183 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 6.4

Open this sounding in Storm Lab

The text

As transmitted.

510 
WUUS52 KTAE 230129
SVRTAE
FLC005-131-133-230215-
/O.NEW.KTAE.SV.W.0189.180723T0129Z-180723T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tallahassee FL
829 PM CDT SUN JUL 22 2018

The National Weather Service in Tallahassee has issued a

* Severe Thunderstorm Warning for...
  Northwestern Bay County in the Panhandle of Florida...
  Southeastern Walton County in the Panhandle of Florida...
  Southern Washington County in the Panhandle of Florida...

* Until 915 PM CDT.

* At 828 PM CDT, a severe thunderstorm was located 14 miles northeast
  of Santa Rosa Beach, moving east at 30 mph.

  HAZARD...70 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Vernon, Eglin Air Force Base, Live Oak, Freeport, Wausau, Ebro,
  Hinsons Crossroads, Red Bay, Greenhead, Rock Hill, Bruce, Red Head,
  Eucheeanna, Holmes Valley, Millers Ferry, Pine Log, Knox Hill,
  Smyrna, Spring Hollow and Sylvania.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3067 8616 3068 8556 3034 8555 3039 8610
      3040 8612 3042 8612 3042 8614 3043 8612
      3043 8615 3046 8615 3047 8613 3048 8614
      3047 8615 3049 8616
TIME...MOT...LOC 0128Z 273DEG 26KT 3049 8605 

HAIL...0.75IN
WIND...70MPH
 
$$

32

1 follow-up statement

395 
WWUS52 KTAE 230204
SVSTAE

Severe Weather Statement
National Weather Service Tallahassee FL
904 PM CDT SUN JUL 22 2018

FLC005-131-133-230213-
/O.CAN.KTAE.SV.W.0189.000000T0000Z-180723T0215Z/
Bay FL-Walton FL-Washington FL-
904 PM CDT SUN JUL 22 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BAY...
SOUTHEASTERN WALTON AND SOUTHERN WASHINGTON COUNTIES 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 3067 8616 3068 8556 3034 8555 3039 8610
      3040 8612 3042 8612 3042 8614 3043 8612
      3043 8615 3046 8615 3047 8613 3048 8614
      3047 8615 3049 8616
TIME...MOT...LOC 0203Z 273DEG 26KT 3048 8575 

$$

32

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 Jul 22, 8:00 PM CDT, 29 minutes earlier.

Area forecast discussion, Jul 22, 8:00 PM CDT, 29 minutes before

Area Forecast Discussion
National Weather Service Tallahassee FL
900 PM EDT Sun Jul 22 2018

.UPDATE...

An active day for severe weather is struggling to come to a
close. Even with the majority of storms having now pushed east of
the forecast area, an isolated strong to severe storm will still
be possible through this evening. This can already be seen as a
few storms have already began to ironically drift into our western
zones as the last few severe cells inch out of our far eastern
edge. These western counties have now had just enough time it
seems to recover a little bit of instability before sunset, and
although normally not enough to write home about the 00Z sounding
shows substantial deep layer shear for July, helping the
organization and longevity of anything that manages to get going.
Some minor updates to the forecast to were made to reflect current
trends, otherwise it remains unchanged.

&&

.PREV DISCUSSION [730 PM EDT]...

.NEAR TERM [Through Tonight]...

Unusually amplified pattern for late July continues to support
rounds of severe weather across the forecast area. Convection
continues to develop along and just west of the Suwannee River,
generally becoming severe after moving across the river. To the
west, severe convection has formed along the nose of a 500mb speed
max, where deep layer shear is maximized. Developing in a strongly
unstable atmosphere (SBCAPE of 4500j/kg from 18Z KTAE sounding) with
unidirectional shear, these cells are showing splitting
characteristics with strong left and right moving members. This
cluster is expected to continue developing southeastward with time
this afternoon, bringing the threat for damaging winds, large hail,
and isolated tornadoes through SE Alabama and into the Florida
Panhandle and Big Bend.

This activity will continue offshore and into the southeastern Big
Bend this evening before exiting the region overnight.

.SHORT TERM [Monday Through Tuesday Night]...

The incredibly anomalous (-4 standard deviation) upper-low will
slide over the Tri-State region on Monday. As it does so, the best
large-scale forcing and deep layer shear will be southwest and
east of us. Expect scattered seabreeze development to remain in
north Florida, though boundaries from storms developing east of
us, and boundaries put off from seabreeze storms could result in
a scattering of storms region-wide tomorrow. On Tuesday, the
frontal boundary associated with the filling upper-low may drift
back inland and westward as it begins to weaken. This, combined
with the seabreeze will be the focus for scattered storms. Again,
severe weather is not expected.

.LONG TERM [Wednesday Through Sunday]...

Starting Wednesday, we'll transition back to a more typical
summertime patter across the region, with the seabreeze being the
main forcing mechanism for afternoon storms. Highs and lows will
run about normal for this time of year.

.AVIATION [Through 00Z Tuesday]...

The threat for +TSRA activity will linger into tonight. While
most of the remaining activity is currently pushing east past
KVLD, a strong isolated storm can not be ruled out near the other
terminals. There is also a chance for some reduced visibility
early in the morning mainly near KABY and KVLD, otherwise outside
of TSRA influence VFR conditions will prevail.

.MARINE...

Advisory conditions will continue into tonight before subsiding to
Cautionary conditions on Monday, and below headline levels by
Monday night. A return to typically low winds and seas is expected
by Tuesday.

.FIRE WEATHER...

Hazardous fire weather conditions are not expected over the next
several days.

.HYDROLOGY...

As storms become more scattered in nature beginning tomorrow, the
threat for flooding will decrease significantly.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is requested. Spotters should safely report
significant weather conditions and/or damage by calling the office or
tweeting us @NWSTallahassee.

&&

.PRELIMINARY POINT TEMPS/POPS...

Tallahassee   73  90  72  89  72 /  50  50  20  60  30
Panama City   78  89  76  87  77 /  50  40  20  50  30
Dothan        72  88  72  87  73 /  30  40  20  60  30
Albany        72  88  72  88  74 /  30  40  20  70  30
Valdosta      71  89  72  88  72 /  40  50  20  70  30
Cross City    74  90  73  87  73 /  70  50  30  60  50
Apalachicola  78  88  76  87  77 /  60  30  20  50  30

&&

.TAE WATCHES/WARNINGS/ADVISORIES...
FL...High Rip Current Risk through Monday morning for Coastal Bay-
     Coastal Franklin-Coastal Gulf-South Walton.

GA...None.
AL...None.
GM...Small Craft Advisory until 4 AM EDT Monday for Apalachee Bay or
     Coastal Waters From Keaton Beach to Ochlockonee River FL
     out to 20 Nm-Coastal Waters From Ochlockonee River to
     Apalachicola Fl out to 20 Nm-Coastal waters from Suwannee
     River to Keaton Beach FL out 20 NM-Coastal waters from
     Mexico Beach to Apalachicola FL out 20 NM-Coastal waters
     from Mexico Beach to Okaloosa Walton County Line FL out 20
     NM-Waters from Suwannee River to Apalachicola FL from 20 to
     60 NM-Waters from Apalachicola to Mexico Beach FL from 20
     to 60 NM-Waters from Mexico Beach to Okaloosa Walton County
     Line FL from 20 to 60 NM.

&&

UPDATE...Humphreys
NEAR TERM...Camp
SHORT TERM...Harrigan
LONG TERM...Harrigan
AVIATION...Humphreys
MARINE...Harrigan
FIRE WEATHER...Harrigan
HYDROLOGY...Harrigan

In the hours before

Local storm report, Jul 22, 6:59 PM CDT, 1 hour 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
759 PM EDT SUN JUL 22 2018

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

0524 PM     TSTM WND DMG     HOLMES VALLEY           30.58N 85.74W
07/22/2018                   WASHINGTON         FL   COUNTY OFFICIAL

            POWER LINE DOWN REPORTED AT 3665 TUCKER LANE
            WASHINGTON COUNTY.

&&

FD

Local storm report, Jul 22, 7:29 PM CDT, 1 hour before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
829 PM EDT SUN JUL 22 2018

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

0636 PM     HAIL             1 SSE PERRY             30.11N 83.58W
07/22/2018  E0.25 INCH       TAYLOR             FL   COUNTY OFFICIAL

            PEA SIZE HAIL REPORTED AT THE INTERSECTION
            OF HIGHWAY 27 AND JEFFERSON ST IN PERRY, FL.

&&

FD

Local storm report, Jul 22, 7:45 PM CDT, 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
845 PM EDT SUN JUL 22 2018

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

0728 PM     TSTM WND DMG     3 SSE HAHIRA            30.95N 83.36W
07/22/2018                   LOWNDES            GA   COUNTY OFFICIAL

            FALLEN POWER LINES REPORTED AT 5600
            THOMPSON, HAHIRA, GA.

&&

FD

Local storm report, Jul 22, 8:02 PM CDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
902 PM EDT SUN JUL 22 2018

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

0812 PM     HAIL             1 NNE LAKELAND          31.05N 83.07W
07/22/2018  E0.25 INCH       LANIER             GA   COUNTY OFFICIAL

            PEA SIZED HAIL REPORTED NORTH OF LAKELAND,
            GA ALONG BRANTLEY ST.

&&

FD

Local storm report, Jul 22, 8:04 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
904 PM EDT SUN JUL 22 2018

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

0812 PM     HAIL             LAKELAND                31.04N 83.08W
07/22/2018  E0.88 INCH       LANIER             GA   COUNTY OFFICIAL

            NICKEL SIZED HAIL REPORTED IN LAKELAND, GA.

&&

FD

Local storm report, Jul 22, 8:20 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
920 PM EDT SUN JUL 22 2018

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

0806 PM     TSTM WND DMG     1 SSE PONCE DE LEON     30.71N 85.93W
07/22/2018                   HOLMES             FL   PUBLIC

            THERE ARE SEVERAL DOWNED TREES REPORTED AT
            1661-1729 SUNRISE CIR, PONCE DE LEON (NEAR
            I-10 AND EXIT 96).

&&

FD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 7:06 PM CDT	Areal Flood Advisory	TAE	Dixie, Lafayette	3 hr
Jul 22, 7:42 PM CDT	Severe Thunderstorm Warning	TAE	Walton	48 min
Jul 22, 8:08 PM CDT	Special Marine Warning	TAE		52 min
Jul 22, 8:49 PM CDT	Special Marine Warning	TAE		86 min
Jul 22, 9:11 PM CDT	Special Marine Warning	TAE		94 min
Jul 22, 9:15 PM CDT	Severe Thunderstorm Warning	TAE	Calhoun, Gulf, Liberty	45 min
Jul 22, 9:30 PM CDT	Severe Thunderstorm Warning	TAE	Dixie, Taylor	60 min
Jul 22, 9:50 PM CDT	Severe Thunderstorm Warning	TAE	Franklin, Gulf, Liberty	85 min
Jul 22, 9:58 PM CDT	Special Marine Warning	TAE		2 hr
Jul 22, 10:41 PM CDT	Special Marine Warning	TAE		36 min
Jul 22, 10:58 PM CDT	Special Marine Warning	TAE		2 hr
Jul 22, 11:52 PM CDT	Special Marine Warning	TAE		53 min
Jul 23, 12:06 AM CDT	Special Marine Warning	TAE		114 min
Jul 23, 12:40 AM CDT	Special Marine Warning	TAE		65 min
Jul 23, 4:47 PM CDT	Special Weather Statement	TAE	Madison	43 min
Jul 23, 5:29 PM CDT	Special Weather Statement	TAE	Madison	46 min
Jul 23, 5:54 PM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Madison	38 min

Nearby

Severe Thunderstorm Warnings in Florida, 2018 Every severe thunderstorm warning in 2018

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.