Alert archive / Florida / Tornado Warnings in 2017

Tornado Warning 64, NWS Mobile, AL

October 8, 2017Okaloosa County, Florida

NWS Mobile, AL issued this tornado warning at Oct 8, 2017, 12:58 AM CDT for Okaloosa County, Florida. It was in force for 32 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: Oct 8, 2017, 12:58 AM CDT (05:58 UTC)
Expired: Oct 8, 2017, 1:30 AM CDT
In force: 32 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Okaloosa County, FL

The radar

The Eglin Afb radar (KEVX), 65 km from the middle of the area, began a volume at 05:57 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 watch it was issued in

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

Issued	Product	Office	Lasted
Oct 7, 7:05 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 6.0 hours before the alert went out and 220 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: 738 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1032 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

As transmitted.

529 
WFUS54 KMOB 080558
TORMOB
FLC091-080630-
/O.NEW.KMOB.TO.W.0064.171008T0558Z-171008T0630Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mobile AL
1258 AM CDT SUN OCT 8 2017

The National Weather Service in Mobile has issued a

* Tornado Warning for...
  Southwestern Okaloosa County in northwestern Florida...

* Until 130 AM CDT
    
* At 1258 AM CDT, a severe thunderstorm capable of producing a
  tornado was located over Lake Lorraine, moving north at 45 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
  southwestern 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 3040 8654 3040 8658 3068 8679 3074 8652
TIME...MOT...LOC 0558Z 169DEG 41KT 3044 8657 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 7, 9:13 PM CDT	Tornado Warning	MOB	Escambia	32 min
Oct 7, 9:52 PM CDT	Flash Flood Warning	MOB	Escambia	6 hr
Oct 7, 11:01 PM CDT	Flash Flood Warning	MOB	Escambia	6 hr
Oct 7, 11:46 PM CDT	Flash Flood Warning	MOB	Escambia, Santa Rosa	6 hr
Oct 8, 1:18 AM CDT	Tornado Warning	MOB	Okaloosa	27 min
Oct 8, 2:06 AM CDT	Flash Flood Warning	MOB	Okaloosa, Santa Rosa	7 hr
Oct 8, 3:41 AM CDT	Areal Flood Warning	MOB	Escambia	6 hr
Oct 8, 4:58 AM CDT	Areal Flood Warning	MOB	Escambia	6 hr
Oct 8, 5:37 AM CDT	Areal Flood Warning	MOB	Escambia, Santa Rosa	6 hr
Oct 8, 10:06 AM CDT	River Flood Warning	MOB	Okaloosa	45 hr
Oct 8, 10:14 AM CDT	River Flood Warning	MOB	Okaloosa, Santa Rosa	63 hr
Oct 8, 10:20 AM CDT	High Surf Advisory	MOB	Escambia, Okaloosa, Santa Rosa	21 hr
Oct 8, 11:09 AM CDT	Areal Flood Warning	MOB	Okaloosa, Santa Rosa	6 hr

Nearby

Tornado Warnings in Florida, 2017 Every tornado warning in 2017 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.