Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 189, NWS Mobile, AL

September 4, 2012Escambia County, Florida; Baldwin County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Sep 4, 2012, 4:44 PM CDT for Escambia County, Florida; Baldwin County, Alabama. It was in force for 61 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: Sep 4, 2012, 4:44 PM CDT (21:44 UTC)
Expired: Sep 4, 2012, 5:45 PM CDT
In force: 61 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Baldwin County, AL, Escambia County, FL

The radar

The Mobile radar (KMOB), 65 km from the middle of the area, began a volume at 21:42 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, 9.7 hours before the alert went out and 210 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: 1547 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 675 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: -0.2
Supercell composite: -1.5

Open this sounding in Storm Lab

The text

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

076 
WUUS54 KMOB 042144
SVRMOB
ALC003-FLC033-042245-
/O.NEW.KMOB.SV.W.0189.120904T2144Z-120904T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
444 PM CDT TUE SEP 4 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL ESCAMBIA COUNTY IN NORTHWEST FLORIDA...
  CENTRAL BALDWIN COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 545 PM CDT

* AT 442 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING
  WINDS OVER 60 MPH WAS LOCATED 13 MILES SOUTHEAST OF BAY MINETTE...
  OR 13 MILES EAST OF STAPLETON...AND MOVING SOUTH AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ROBERTSDALE...

THIS INCLUDES INTERSTATE 10 IN ALABAMA BETWEEN MILE MARKERS 48 AND
63.

LAT...LON 3048 8745 3050 8774 3087 8768 3085 8747
TIME...MOT...LOC 2144Z 000DEG 17KT 3078 8758

$$

2 follow-up statements

244 
WWUS54 KMOB 042207
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
507 PM CDT TUE SEP 4 2012

FLC033-042217-
/O.CAN.KMOB.SV.W.0189.000000T0000Z-120904T2245Z/
ESCAMBIA FL-
507 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR WEST
CENTRAL ESCAMBIA COUNTY...

AT 502 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR WEST CENTRAL 
ESCAMBIA COUNTY HAS MOVED OUT OF THE COUNTY...THUS THE SEVERE 
THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3050 8774 3081 8769 3081 8758 3078 8754
      3076 8753 3074 8753 3072 8748 3070 8746
      3048 8745
TIME...MOT...LOC 2207Z 000DEG 17KT 3067 8758

$$

ALC003-042245-
/O.CON.KMOB.SV.W.0189.000000T0000Z-120904T2245Z/
BALDWIN AL-
507 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR CENTRAL BALDWIN COUNTY...

AT 502 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING
WINDS OVER 60 MPH WAS LOCATED 12 MILES NORTHEAST OF LOXLEY...OR 13
MILES EAST OF STAPLETON...MOVING SOUTH AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  ROBERTSDALE...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 48 AND 63.

LAT...LON 3050 8774 3081 8769 3081 8758 3078 8754
      3076 8753 3074 8753 3072 8748 3070 8746
      3048 8745
TIME...MOT...LOC 2207Z 000DEG 17KT 3067 8758

$$

193 
WWUS54 KMOB 042236
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
536 PM CDT TUE SEP 4 2012

ALC003-042246-
/O.EXP.KMOB.SV.W.0189.000000T0000Z-120904T2245Z/
BALDWIN AL-
536 PM CDT TUE SEP 4 2012

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

AT 534 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR CENTRAL 
BALDWIN COUNTY HAS WEAKENED TO BELOW SEVERE LIMITS...THUS THE SEVERE 
THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE AT 545 PM CDT.

LAT...LON 3050 8774 3081 8769 3081 8758 3078 8754
      3076 8753 3074 8753 3072 8748 3070 8746
      3048 8745
TIME...MOT...LOC 2236Z 000DEG 17KT 3053 8758

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 8:12 AM CDT	Flash Flood Watch	MOB		25 hr
Sep 4, 10:44 AM CDT	Areal Flood Advisory	MOB	Okaloosa	2 hr
Sep 4, 3:34 PM CDT	Flash Flood Warning	MOB	Escambia, Santa Rosa	6 hr
Sep 4, 3:44 PM CDT	Severe Thunderstorm Warning	MOB	Escambia, Santa Rosa	61 min
Sep 4, 4:59 PM CDT	Severe Thunderstorm Warning	MOB	Escambia	61 min
Sep 4, 6:52 AM CDT	Areal Flood Advisory	MOB	Butler, Crenshaw	3 hr
Sep 4, 7:20 AM CDT	Areal Flood Advisory	MOB	Covington	3 hr
Sep 4, 7:30 AM CDT	Flash Flood Warning	MOB	Butler, Crenshaw	6 hr
Sep 4, 8:26 AM CDT	Flash Flood Warning	MOB	Butler, Covington, Crenshaw	6 hr
Sep 4, 9:10 AM CDT	Flash Flood Warning	MOB	Wilcox	6 hr
Sep 4, 10:13 AM CDT	Areal Flood Advisory	MOB	Clarke, Conecuh, Monroe	3 hr
Sep 4, 11:40 AM CDT	Flash Flood Warning	MOB	Butler, Conecuh, Monroe	3 hr
Sep 4, 1:33 PM CDT	Areal Flood Warning	MOB	Butler, Crenshaw	3 hr
Sep 4, 2:14 PM CDT	Areal Flood Warning	MOB	Butler, Conecuh, Covington, Crenshaw, Monroe, Wilcox	2 hr
Sep 4, 4:26 PM CDT	Areal Flood Warning	MOB	Conecuh, Monroe	8 hr
Sep 4, 5:51 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	54 min
Sep 4, 5:56 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Monroe, Washington, Wilcox	64 min
Sep 4, 6:37 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	30 min
Sep 4, 6:49 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Choctaw, Clarke, Escambia, Mobile, Monroe and 2 more	34 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012 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.