Alert archive / Florida / Tornado Warnings in 2017

Tornado Warning 21, NWS Mobile, AL

April 3, 2017Okaloosa County, Florida

NWS Mobile, AL issued this tornado warning at Apr 3, 2017, 9:59 AM CDT for Okaloosa County, Florida. It was in force for 31 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: Apr 3, 2017, 9:59 AM CDT (14:59 UTC)
Expired: Apr 3, 2017, 10:30 AM CDT
In force: 31 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Okaloosa County, FL

The radar

The Eglin Afb radar (KEVX), 54 km from the middle of the area, began a volume at 15:03 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
Apr 3, 7:06 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 3.0 hours before the alert went out and 209 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: 1400 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 580 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 248 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 9.3

Open this sounding in Storm Lab

The text

As transmitted.

414 
WFUS54 KMOB 031459
TORMOB
FLC091-031530-
/O.NEW.KMOB.TO.W.0021.170403T1459Z-170403T1530Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mobile AL
959 AM CDT MON APR 3 2017

The National Weather Service in Mobile has issued a

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

* Until 1030 AM CDT
    
* At 959 AM CDT, a severe thunderstorm capable of producing a tornado
  was located 8 miles east of Crestview, moving east at 25 mph.

  HAZARD...Tornado and quarter size hail. 

  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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 3069 8639 3072 8650 3082 8652 3088 8639
TIME...MOT...LOC 1459Z 258DEG 20KT 3079 8644 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

1 follow-up statement

406 
WWUS54 KMOB 031521
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
1021 AM CDT MON APR 3 2017

FLC091-031530-
/O.EXP.KMOB.TO.W.0021.000000T0000Z-170403T1530Z/
Okaloosa FL-
1021 AM CDT MON APR 3 2017

...THE TORNADO WARNING FOR EAST CENTRAL OKALOOSA COUNTY WILL EXPIRE
AT 1030 AM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

A tornado watch remains in effect until 100 PM CDT for northwestern
Florida.

LAT...LON 3069 8639 3072 8650 3082 8652 3088 8639
TIME...MOT...LOC 1520Z 258DEG 20KT 3081 8632 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 3, 7:45 AM CDT	Special Weather Statement	MOB	Escambia, Okaloosa, Santa Rosa	45 min
Apr 3, 7:53 AM CDT	Flash Flood Watch	MOB	Escambia, Okaloosa, Santa Rosa	4 hr
Apr 3, 8:09 AM CDT	Severe Thunderstorm Warning	MOB	Escambia, Santa Rosa	51 min
Apr 3, 8:26 AM CDT	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	64 min
Apr 3, 9:00 AM CDT	Severe Thunderstorm Warning	MOB	Escambia	60 min
Apr 3, 9:33 AM CDT	Areal Flood Advisory	MOB	Escambia, Okaloosa, Santa Rosa	3 hr
Apr 3, 9:36 AM CDT	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	39 min
Apr 3, 9:43 AM CDT	Severe Thunderstorm Warning	MOB	Escambia, Santa Rosa	62 min
Apr 3, 10:14 AM CDT	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	46 min
Apr 3, 10:46 AM CDT	Severe Thunderstorm Warning	MOB	Escambia, Santa Rosa	45 min
Apr 3, 11:00 AM CDT	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	31 min

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.