Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 21, NWS Tallahassee, FL

April 15, 20184 counties in Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Apr 15, 2018, 2:28 AM CDT for 4 counties in Florida. It was in force for 48 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: Apr 15, 2018, 2:28 AM CDT (07:28 UTC)
Expired: Apr 15, 2018, 3:16 AM CDT
In force: 48 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Eglin Afb radar (KEVX), 29 km from the middle of the area, began a volume at 07:32 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
Apr 15, 2:56 AM CDT	TSTM WND DMG	1 Wsw Bunker, FL	TREE LIMB BLEW DOWN ONTO A TRANSFORMER AND RESULTED IN A POWER OUTAGE TO 98 CUSTOMERS.

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

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 14, 10:58 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 7.5 hours before the alert went out and 181 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1537 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

440 
WUUS52 KTAE 150728
SVRTAE
FLC005-059-131-133-150845-
/O.NEW.KTAE.SV.W.0021.180415T0728Z-180415T0845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tallahassee FL
228 AM CDT SUN APR 15 2018

The National Weather Service in Tallahassee has issued a

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

* Until 345 AM CDT.

* At 228 AM CDT, a severe thunderstorm was located 7 miles southwest
  of Santa Rosa Beach, moving northeast at 55 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Panama City Beach, Vernon, Santa Rosa Beach, De Funiak Springs,
  Bonifay, Chipley, Eglin Air Force Base, Live Oak, Freeport, Ponce
  De Leon, Caryville, Westville, Ebro, Whitehead Crossroads, Villa
  Tasso, Gulf Resort Beach, Blue Mountain Beach, West Panama City,
  Seaside and Bahama Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

A Tornado Watch remains in effect until 700 AM CDT for the Panhandle
of Florida.

LAT...LON 3039 8639 3038 8633 3042 8631 3039 8626
      3040 8623 3042 8625 3038 8617 3038 8612
      3039 8611 3042 8614 3043 8612 3044 8616
      3047 8613 3046 8619 3050 8620 3046 8639
      3073 8625 3083 8554 3015 8581 3036 8639
TIME...MOT...LOC 0728Z 222DEG 49KT 3029 8632 

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

42-DVD

2 follow-up statements

770 
WWUS52 KTAE 150754
SVSTAE

Severe Weather Statement
National Weather Service Tallahassee FL
254 AM CDT SUN APR 15 2018

FLC005-059-131-133-150845-
/O.CON.KTAE.SV.W.0021.000000T0000Z-180415T0845Z/
Bay FL-Walton FL-Holmes FL-Washington FL-
254 AM CDT SUN APR 15 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 AM CDT
FOR NORTHWESTERN BAY...SOUTHEASTERN WALTON...SOUTHERN HOLMES AND
CENTRAL WASHINGTON COUNTIES...

At 253 AM CDT, a severe thunderstorm was located 14 miles east of
Santa Rosa Beach, moving northeast at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Panama City Beach, Vernon, Santa Rosa Beach, De Funiak Springs,
Bonifay, Chipley, Eglin Air Force Base, Live Oak, Freeport, Ponce De
Leon, Caryville, Westville, Ebro, Whitehead Crossroads, Gulf Resort
Beach, Blue Mountain Beach, West Panama City, Seaside, Bahama Beach
and Rock Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

A Tornado Watch remains in effect until 700 AM CDT for the Panhandle
of Florida.

LAT...LON 3039 8626 3040 8623 3042 8625 3038 8617
      3038 8612 3039 8611 3042 8614 3043 8612
      3044 8616 3047 8613 3048 8614 3046 8619
      3049 8619 3052 8623 3073 8625 3083 8554
      3015 8581 3035 8629
TIME...MOT...LOC 0753Z 229DEG 45KT 3045 8602 

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

42-DVD

618 
WWUS52 KTAE 150816
SVSTAE

Severe Weather Statement
National Weather Service Tallahassee FL
316 AM CDT SUN APR 15 2018

FLC005-059-131-133-150826-
/O.CAN.KTAE.SV.W.0021.000000T0000Z-180415T0845Z/
Bay FL-Walton FL-Holmes FL-Washington FL-
316 AM CDT SUN APR 15 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BAY...
SOUTHEASTERN WALTON...SOUTHERN HOLMES AND CENTRAL 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.  However gusty winds are
still possible with this thunderstorm.

A Tornado Watch remains in effect until 700 AM CDT for the Panhandle
of Florida.

LAT...LON 3039 8626 3040 8623 3042 8625 3038 8617
      3038 8612 3039 8611 3042 8614 3043 8612
      3044 8616 3047 8613 3048 8614 3046 8619
      3049 8619 3052 8623 3073 8625 3083 8554
      3015 8581 3035 8629
TIME...MOT...LOC 0815Z 222DEG 49KT 3069 8577 

$$

42-DVD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 1:44 AM CDT	Special Marine Warning	TAE		2 hr
Apr 15, 3:38 AM CDT	Special Marine Warning	TAE		2 hr
Apr 15, 5:32 AM CDT	Special Marine Warning	TAE		88 min
Apr 15, 6:09 AM CDT	Tornado Warning	TAE	Bay, Calhoun, Gulf	36 min
Apr 15, 6:29 AM CDT	Special Marine Warning	TAE		2 hr
Apr 15, 7:16 AM CDT	Severe Thunderstorm Warning	TAE	Gadsden, Leon, Wakulla	44 min
Apr 15, 7:28 AM CDT	Tornado Warning	TAE	Jackson	32 min
Apr 15, 7:34 AM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Leon, Madison, Taylor, Wakulla	41 min
Apr 15, 7:37 AM CDT	Special Marine Warning	TAE		113 min
Apr 15, 7:48 AM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Leon, Madison	27 min
Apr 15, 8:11 AM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Madison, Taylor	49 min
Apr 15, 8:37 AM CDT	Severe Thunderstorm Warning	TAE	Madison	38 min
Apr 15, 9:11 AM CDT	Severe Thunderstorm Warning	TAE	Lafayette, Madison	34 min
Apr 15, 9:21 AM CDT	Special Marine Warning	TAE		24 min
Apr 15, 9:55 AM CDT	Special Marine Warning	TAE		65 min
Apr 15, 9:58 AM CDT	Severe Thunderstorm Warning	TAE	Dixie, Lafayette	47 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.