Alert archive / Florida / Tornado Warnings in 2019

Tornado Warning 55, NWS Mobile, AL

December 17, 2019Okaloosa County, Florida

NWS Mobile, AL issued this tornado warning at Dec 17, 2019, 3:09 AM CST for Okaloosa County, Florida. It was in force for 21 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: Dec 17, 2019, 3:09 AM CST (09:09 UTC)
Expired: Dec 17, 2019, 3:30 AM CST
In force: 21 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Okaloosa County, FL

The radar

The Eglin Afb radar (KEVX), 56 km from the middle of the area, began a volume at 09:08 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.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 9.2 hours before the alert went out and 211 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: 786 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 205 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

437 
WFUS54 KMOB 170909
TORMOB
FLC091-170930-
/O.NEW.KMOB.TO.W.0055.191217T0909Z-191217T0930Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mobile AL
309 AM CST Tue Dec 17 2019

The National Weather Service in Mobile has issued a

* Tornado Warning for...
  East central Okaloosa County in northwestern Florida...

* Until 330 AM CST.
    
* At 309 AM CST, a severe thunderstorm capable of producing a tornado
  was located 6 miles east of Crestview, moving east at 25 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This tornadic thunderstorm will remain over mainly rural areas of
  east central Okaloosa County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3069 8650 3080 8655 3085 8639 3070 8639
TIME...MOT...LOC 0909Z 248DEG 20KT 3075 8646 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

JLH

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 17, 1:05 AM CST	Special Weather Statement	MOB	Escambia	25 min
Dec 17, 1:15 AM CST	Tornado Warning	MOB	Escambia, Santa Rosa	30 min
Dec 17, 1:27 AM CST	Severe Thunderstorm Warning	MOB	Okaloosa	48 min
Dec 17, 2:43 AM CST	Special Weather Statement	MOB	Santa Rosa	32 min
Dec 17, 3:14 AM CST	Tornado Warning	MOB	Okaloosa, Santa Rosa	61 min
Dec 17, 4:58 AM CST	Tornado Warning	MOB	Okaloosa	14 min

Nearby

Tornado Warnings in Florida, 2019 Every tornado warning in 2019 Tornadoes in 2019

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.