Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 77, NWS Mobile, AL

May 30, 2012Mobile County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at May 30, 2012, 4:21 PM CDT for Mobile County, Alabama. It was in force for 54 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: May 30, 2012, 4:21 PM CDT (21:21 UTC)
Expired: May 30, 2012, 5:15 PM CDT
In force: 54 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Mobile County, AL

The radar

The Mobile radar (KMOB), 35 km from the middle of the area, began a volume at 21:22 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.4 hours before the alert went out and 161 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: 1642 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 674 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 23 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.

944 
WUUS54 KMOB 302121
SVRMOB
ALC097-302215-
/O.NEW.KMOB.SV.W.0077.120530T2121Z-120530T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
421 PM CDT WED MAY 30 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL MOBILE COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 515 PM CDT

* AT 418 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING
  WINDS OVER 60 MPH WAS LOCATED 8 MILES WEST OF SARALAND...OR 5 MILES
  SOUTH OF CHUNCHULA...AND MOVING NORTH AT 5 MPH.

* LOCATIONS IMPACTED INCLUDE...
  GULFCREST...          CITRONELLE...         CHUNCHULA...

LAT...LON 3111 8835 3110 8814 3081 8815 3084 8831
TIME...MOT...LOC 2121Z 181DEG 4KT 3086 8822

$$

1 follow-up statement

340 
WWUS54 KMOB 302209 RRA
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
509 PM CDT WED MAY 30 2012

ALC097-302219-
/O.EXP.KMOB.SV.W.0077.000000T0000Z-120530T2215Z/
MOBILE AL-
509 PM CDT WED MAY 30 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED TO EXPIRE FOR
NORTH CENTRAL MOBILE COUNTY...

AT 504 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR NORTH CENTRAL
MOBILE COUNTY HAS WEAKENED TO BELOW SEVERE LIMITS...THUS THE SEVERE
THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE AT 515 PM CDT.

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

LAT...LON 3111 8835 3110 8814 3081 8815 3084 8831
TIME...MOT...LOC 2209Z 181DEG 4KT 3091 8822

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 9:32 PM CDT	Special Marine Warning	MOB		88 min
May 30, 2:23 AM CDT	Severe Thunderstorm Warning	MOB	Covington	37 min
May 30, 2:12 PM CDT	Special Marine Warning	MOB		93 min
May 30, 2:54 PM CDT	Severe Thunderstorm Warning	MOB	Mobile	66 min
May 30, 3:00 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	60 min
May 30, 3:19 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Mobile	56 min
May 30, 4:03 PM CDT	Severe Thunderstorm Warning	MOB	Mobile	57 min
May 30, 4:12 PM CDT	Severe Thunderstorm Warning	MOB	Clarke	37 min
May 30, 4:16 PM CDT	Severe Thunderstorm Warning	MOB	Mobile	59 min
May 30, 5:06 PM CDT	Severe Thunderstorm Warning	MOB	Conecuh, Monroe	54 min
May 30, 5:14 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	24 min
May 30, 5:38 PM CDT	Severe Thunderstorm Warning	MOB	Clarke	67 min
May 30, 5:52 PM CDT	Severe Thunderstorm Warning	MOB	Monroe	29 min
May 30, 6:20 PM CDT	Severe Thunderstorm Warning	MOB	Covington, Escambia	32 min
May 30, 6:47 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	46 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2012 Every severe thunderstorm warning in 2012

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.