Alert archive / Alabama / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 49, NWS Mobile, AL

April 11, 2013Mobile County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Apr 11, 2013, 5:27 PM CDT for Mobile County, Alabama. It was in force for 33 min. 1 report 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: Apr 11, 2013, 5:27 PM CDT (22:27 UTC)
Expired: Apr 11, 2013, 6:00 PM CDT
In force: 33 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Mobile County, AL

The radar

The Mobile radar (KMOB), 20 km from the middle of the area, began a volume at 22:30 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

Time	Report	Where	Remark
Apr 11, 5:30 PM CDT	TSTM WND DMG	4 Ese Theodore, AL	MULTIPLE WAREHOUSES SUSTAINED ROOF DAMAGE.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 11, 1:30 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.5 hours before the alert went out and 160 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: 1207 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 495 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 205 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 5.4

Open this sounding in Storm Lab

The text

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

507 
WUUS54 KMOB 112227
SVRMOB
ALC097-112300-
/O.NEW.KMOB.SV.W.0049.130411T2227Z-130411T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
527 PM CDT THU APR 11 2013

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 600 PM CDT

* AT 525 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING
  WINDS OVER 60 MPH WAS LOCATED 3 MILES SOUTHEAST OF THEODORE...OR 3
  MILES NORTHWEST OF BELLE FONTAINE...AND MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  DOWNTOWN MOBILE...    THEODORE...           PRICHARD...
  I65 AND US 45...      I65 AND I165...       I10 AND I65...
  BELLE FONTAINE...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 16 AND 28. THIS
INCLUDES INTERSTATE 65 BETWEEN MILE MARKERS 1 AND 10.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT THURSDAY EVENING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

&&

LAT...LON 3039 8811 3047 8821 3077 8810 3072 8801
      3070 8800 3064 8803 3064 8805 3059 8805
      3057 8808 3053 8807 3051 8809 3042 8809
TIME...MOT...LOC 2227Z 216DEG 24KT 3052 8814

$$

1 follow-up statement

307 
WWUS54 KMOB 112250
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
550 PM CDT THU APR 11 2013

ALC097-112300-
/O.EXP.KMOB.SV.W.0049.000000T0000Z-130411T2300Z/
MOBILE AL-
550 PM CDT THU APR 11 2013

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

AT 546 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR CENTRAL
MOBILE COUNTY HAS MOVED OUT OF THE COUNTY...THUS THE SEVERE
THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE AT 600 PM CDT.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT THURSDAY EVENING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

LAT...LON 3039 8811 3047 8821 3077 8810 3072 8801
      3070 8800 3064 8803 3064 8805 3059 8805
      3057 8808 3053 8807 3051 8809 3042 8809
TIME...MOT...LOC 2250Z 216DEG 24KT 3064 8803

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 3:47 AM CDT	Rip Current Statement	MOB		20 hr
Apr 11, 3:49 AM CDT	Wind Advisory	MOB	Butler, Choctaw, Clarke, Conecuh, Covington, Crenshaw and 4 more	15 hr
Apr 11, 1:41 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	64 min
Apr 11, 2:16 PM CDT	Tornado Warning	MOB	Choctaw	44 min
Apr 11, 2:18 PM CDT	Tornado Warning	MOB	Washington	42 min
Apr 11, 2:36 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke	39 min
Apr 11, 2:44 PM CDT	Severe Thunderstorm Warning	MOB	Washington	31 min
Apr 11, 4:06 PM CDT	Special Marine Warning	MOB		84 min
Apr 11, 5:21 PM CDT	Special Marine Warning	MOB		84 min
Apr 11, 5:27 PM CDT	Flash Flood Warning	MOB	Clarke	6 hr
Apr 11, 5:43 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Mobile	32 min
Apr 11, 6:06 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Escambia	24 min
Apr 11, 6:32 PM CDT	Special Marine Warning	MOB		88 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2013 Every severe thunderstorm warning in 2013

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.