Alert archive / Florida / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 172, NWS Mobile, AL

July 21, 2016Santa Rosa County, Florida; Escambia County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Jul 21, 2016, 3:44 PM CDT for Santa Rosa County, Florida; Escambia County, Alabama. 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: Jul 21, 2016, 3:44 PM CDT (20:44 UTC)
Expired: Jul 21, 2016, 4:15 PM CDT
In force: 31 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Escambia County, AL, Santa Rosa County, FL

The radar

The Eglin Afb radar (KEVX), 106 km from the middle of the area, began a volume at 20:47 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

Birmingham, AL (KBMX), launched 12:00Z, 8.7 hours before the alert went out and 240 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: 1505 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 1214 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: -3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

254 
WUUS54 KMOB 212044
SVRMOB
ALC053-FLC113-212115-
/O.NEW.KMOB.SV.W.0172.160721T2044Z-160721T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
344 PM CDT THU JUL 21 2016

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN ESCAMBIA COUNTY IN SOUTH CENTRAL ALABAMA...
  NORTHEASTERN SANTA ROSA COUNTY IN NORTHWESTERN FLORIDA...

* UNTIL 415 PM CDT

* AT 343 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM NEAR BREWTON TO NEAR RIVERVIEW TO 10 MILES SOUTHEAST
  OF EAST BREWTON...MOVING SOUTHWEST AT 15 MPH.

  HAZARD...60 MPH WIND GUSTS AND PENNY SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  BREWTON...EAST BREWTON AND RIVERVIEW. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3100 8669 3099 8670 3100 8679 3096 8679
      3091 8690 3098 8718 3100 8717 3100 8716
      3108 8713 3122 8700 3111 8691 3108 8670
      3100 8670
TIME...MOT...LOC 2043Z 059DEG 14KT 3116 8703 3105 8700 3100 8691 

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

BUTTS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 2:56 PM CDT	Severe Thunderstorm Warning	MOB	Escambia	34 min
Jul 21, 3:11 PM CDT	Severe Thunderstorm Warning	MOB	Escambia, Santa Rosa	49 min
Jul 21, 4:59 PM CDT	Special Weather Statement	MOB	Okaloosa	46 min
Jul 21, 12:51 PM CDT	Special Weather Statement	MOB	Mobile	24 min
Jul 21, 1:13 PM CDT	Special Weather Statement	MOB	Baldwin	47 min
Jul 21, 1:46 PM CDT	Special Weather Statement	MOB	Baldwin	44 min
Jul 21, 2:24 PM CDT	Special Weather Statement	MOB	Baldwin	36 min
Jul 21, 2:25 PM CDT	Special Weather Statement	MOB	Mobile	50 min
Jul 21, 2:28 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	32 min
Jul 21, 2:51 PM CDT	Areal Flood Advisory	MOB	Mobile	54 min
Jul 21, 3:27 PM CDT	Special Weather Statement	MOB	Covington	48 min
Jul 21, 5:38 PM CDT	Severe Thunderstorm Warning	MOB	Monroe	22 min
Jul 21, 5:59 PM CDT	Special Weather Statement	MOB	Monroe	31 min
Jul 21, 6:45 PM CDT	Special Weather Statement	MOB	Wilcox	30 min

Nearby

Severe Thunderstorm Warnings in Florida, 2016 Severe Thunderstorm Warnings in Alabama, 2016 Every severe thunderstorm warning in 2016

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.