Alert archive / Alabama / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 40, NWS Mobile, AL

May 20, 2015Escambia County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at May 20, 2015, 6:49 PM CDT for Escambia County, Alabama. It was in force for 41 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
May 20, 2015, 6:49 PM CDT (23:49 UTC)
Expired
May 20, 2015, 7:30 PM CDT
In force
41 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Escambia County, AL

The radar

The Eglin Afb radar (KEVX), 106 km from the middle of the area, began a volume at 23:50 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.

What was reported inside it

TimeReportWhereRemark
May 20, 6:52 PM CDTTSTM WND DMGBrewton, ALTREE DOWN ON APPLETON ROAD NORTH OF BREWTON.
May 20, 6:55 PM CDTHAIL 1E Brewton, AL

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 11.8 hours before the alert went out and 228 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-pSkew-T log-p diagram, Birmingham, AL at 12:00Z on 2015-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 29 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2015-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
29 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
1194 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
5 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

411 
WUUS54 KMOB 202349
SVRMOB
ALC053-210030-
/O.NEW.KMOB.SV.W.0040.150520T2349Z-150521T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
649 PM CDT WED MAY 20 2015

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN ESCAMBIA COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 730 PM CDT

* AT 649 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
  SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED OVER EAST
  BREWTON...AND MOVING EAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BREWTON...             EAST BREWTON...        RIVERVIEW...
  US 29 AND CR 43...     DAMASCUS...            ROCK CREEK...
  PEA RIDGE...           ROBERTS...             BRADLEY...
  DIXONVILLE...          ROCK HILL...           PARKER SPRINGS...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS OFTEN PRODUCE FREQUENT CLOUD TO GROUND
LIGHTNING. PLEASE TAKE COVER UNTIL THE STORM PASSES.

THIS IS A DANGEROUS STORM. PREPARE FOR DESTRUCTIVE HAIL AND DAMAGING
WINDS. PEOPLE OUTSIDE SHOULD MOVE INSIDE A STRONG BUILDING BUT AWAY
FROM WINDOWS.

TO REPORT SEVERE WEATHER...CALL (800) 284-9059.

&&

LAT...LON 3101 8670 3100 8687 3100 8709 3115 8715
      3124 8677 3122 8676 3121 8677 3120 8677
      3119 8676 3120 8674 3118 8673
TIME...MOT...LOC 2349Z 249DEG 16KT 3109 8704 
$$
1 follow-up statement
587 
WWUS54 KMOB 210010
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
710 PM CDT WED MAY 20 2015

ALC053-210030-
/O.CON.KMOB.SV.W.0040.000000T0000Z-150521T0030Z/
ESCAMBIA AL-
710 PM CDT WED MAY 20 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR EASTERN ESCAMBIA COUNTY...
    
AT 709 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED NEAR US 29 AND
CR 43...OR 12 MILES EAST OF EAST BREWTON...MOVING EAST AT 35 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS OFTEN PRODUCE FREQUENT CLOUD TO GROUND
LIGHTNING. PLEASE TAKE COVER UNTIL THE STORM PASSES.

THIS IS A DANGEROUS STORM. PREPARE FOR DESTRUCTIVE HAIL AND DAMAGING 
WINDS. PEOPLE OUTSIDE SHOULD MOVE INSIDE A STRONG BUILDING BUT AWAY 
FROM WINDOWS.

TO REPORT SEVERE WEATHER...CALL (800) 284-9059.

&&

LAT...LON 3101 8670 3100 8687 3100 8701 3115 8703
      3124 8677 3122 8676 3121 8677 3120 8677
      3119 8676 3120 8674 3118 8673
TIME...MOT...LOC 0009Z 271DEG 29KT 3108 8684 
$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 1:56 PM CDTSpecial Marine WarningMOB64 min
May 20, 2:31 PM CDTSpecial Weather StatementMOBChoctaw59 min
May 20, 3:33 PM CDTSpecial Weather StatementMOBChoctaw27 min
May 20, 3:44 PM CDTSpecial Marine WarningMOB91 min
May 20, 4:45 PM CDTSpecial Weather StatementMOBClarke60 min
May 20, 5:02 PM CDTSpecial Weather StatementMOBClarke, Monroe58 min
May 20, 5:50 PM CDTSpecial Weather StatementMOBButler, Conecuh, Covington, Crenshaw, Escambia70 min
May 20, 6:31 PM CDTSpecial Weather StatementMOBEscambia59 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2015Every severe thunderstorm warning in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.