Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 171, NWS Mobile, AL

July 28, 2021Santa Rosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at Jul 28, 2021, 3:58 PM CDT for Santa Rosa 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: Jul 28, 2021, 3:58 PM CDT (20:58 UTC)
Expired: Jul 28, 2021, 4:30 PM CDT
In force: 32 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Santa Rosa County, FL

The radar

The Eglin Afb radar (KEVX), 99 km from the middle of the area, began a volume at 20:57 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 nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 9.0 hours before the alert went out and 256 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: 679 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 861 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

964 
WUUS54 KMOB 282058
SVRMOB
FLC113-282130-
/O.NEW.KMOB.SV.W.0171.210728T2058Z-210728T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
358 PM CDT Wed Jul 28 2021

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  East central Santa Rosa County in northwestern Florida...

* Until 430 PM CDT.

* At 358 PM CDT, a severe thunderstorm was located 4 miles northeast
  of Roeville, or 8 miles northeast of Milton, moving southwest at 5
  mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Milton, Bagdad, Point Baker and Roeville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Hail and damaging winds and continuous cloud to ground lightning is 
occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3077 8712 3086 8681 3064 8679 3062 8680
      3055 8704
TIME...MOT...LOC 2058Z 056DEG 6KT 3071 8693 

HAIL...0.75IN
WIND...60MPH
 
$$

JLH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 1:46 PM CDT	Heat Advisory	MOB	Escambia, Okaloosa, Santa Rosa	44 hr
Jul 28, 1:46 PM CDT	Heat Advisory	MOB	Escambia, Okaloosa, Santa Rosa	4 days
Jul 28, 3:21 PM CDT	Special Weather Statement	MOB	Okaloosa	39 min
Jul 28, 3:27 PM CDT	Special Weather Statement	MOB	Santa Rosa	48 min
Jul 28, 3:37 PM CDT	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	23 min
Jul 28, 3:55 PM CDT	Special Weather Statement	MOB	Okaloosa	50 min
Jul 28, 4:08 PM CDT	Areal Flood Advisory	MOB	Okaloosa	14 min
Jul 28, 4:22 PM CDT	Flash Flood Warning	MOB	Okaloosa	5 hr
Jul 28, 4:32 PM CDT	Special Weather Statement	MOB	Santa Rosa	43 min
Jul 28, 4:33 PM CDT	Areal Flood Advisory	MOB	Santa Rosa	3 hr
Jul 28, 5:16 PM CDT	Areal Flood Advisory	MOB	Okaloosa	3 hr
Jul 28, 5:39 PM CDT	Areal Flood Advisory	MOB	Okaloosa, Santa Rosa	3 hr
Jul 28, 6:48 PM CDT	Areal Flood Advisory	MOB	Escambia, Santa Rosa	3 hr

Nearby

Severe Thunderstorm Warnings in Florida, 2021 Every severe thunderstorm warning in 2021

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.