Alert archive / Florida / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 30, NWS Mobile, AL

January 21, 2017Okaloosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at Jan 21, 2017, 9:25 AM CST for Okaloosa County, Florida. It was in force for 50 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: Jan 21, 2017, 9:25 AM CST (15:25 UTC)
Expired: Jan 21, 2017, 10:15 AM CST
In force: 50 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Okaloosa County, FL

The radar

The Eglin Afb radar (KEVX), 70 km from the middle of the area, began a volume at 15:26 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
Jan 21, 3:56 AM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 3.4 hours before the alert went out and 223 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: 352 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 613 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

521 
WUUS54 KMOB 211525
SVRMOB
FLC091-211615-
/O.NEW.KMOB.SV.W.0030.170121T1525Z-170121T1615Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
925 AM CST SAT JAN 21 2017

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  Northern Okaloosa County in northwestern Florida...

* Until 1015 AM CST

* At 925 AM CST, a severe thunderstorm was located near Baker, or 7
  miles northwest of Crestview, moving east at 40 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Crestview, Baker and Laurel Hill. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 1100 AM CST for south central
Alabama...and northwestern Florida.

LAT...LON 3076 8674 3100 8661 3099 8639 3077 8639
TIME...MOT...LOC 1525Z 263DEG 34KT 3085 8663 

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

1 follow-up statement

781 
WWUS54 KMOB 211615
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
1015 AM CST SAT JAN 21 2017

FLC091-211625-
/O.EXP.KMOB.SV.W.0030.000000T0000Z-170121T1615Z/
Okaloosa FL-
1015 AM CST SAT JAN 21 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN OKALOOSA COUNTY HAS
EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning has been allowed to expire.

A tornado watch remains in effect until 1100 AM CST for south central
Alabama...and northwestern Florida.

LAT...LON 3076 8674 3100 8661 3099 8639 3077 8639
TIME...MOT...LOC 1615Z 263DEG 34KT 3090 8610 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 20, 8:47 PM CST	River Flood Warning	MOB	Escambia	25 hr
Jan 20, 8:48 PM CST	River Flood Warning	MOB	Okaloosa, Santa Rosa	3 days
Jan 20, 8:49 PM CST	River Flood Warning	MOB	Okaloosa	25 hr
Jan 20, 10:18 PM CST	Rip Current Statement	MOB	Escambia, Okaloosa, Santa Rosa	56 hr
Jan 21, 7:28 AM CST	Wind Advisory	MOB	Escambia, Okaloosa, Santa Rosa	4 hr
Jan 21, 9:14 AM CST	Special Weather Statement	MOB	Escambia, Okaloosa, Santa Rosa	91 min
Jan 21, 9:56 AM CST	Severe Thunderstorm Warning	MOB	Okaloosa	34 min
Jan 21, 10:28 AM CST	Severe Thunderstorm Warning	MOB	Okaloosa	32 min

Nearby

Severe Thunderstorm Warnings in Florida, 2017 Every severe thunderstorm warning 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.