Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 198, NWS Mobile, AL

July 12, 2017Baldwin County, Mobile County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Jul 12, 2017, 6:56 PM CDT for Baldwin County, Mobile County, Alabama. It was in force for 36 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 12, 2017, 6:56 PM CDT (23:56 UTC)
Expired: Jul 12, 2017, 7:32 PM CDT
In force: 36 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Baldwin County, AL, Mobile County, AL

The radar

The Mobile radar (KMOB), 32 km from the middle of the area, began a volume at 23:58 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, 11.9 hours before the alert went out and 166 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: 1787 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 711 m above ground
0-6 km bulk shear: 1 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

499 
WUUS54 KMOB 122356
SVRMOB
ALC003-097-130100-
/O.NEW.KMOB.SV.W.0198.170712T2356Z-170713T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
656 PM CDT WED JUL 12 2017

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  Northern Mobile County in southwestern Alabama...
  West central Baldwin County in southwestern Alabama...

* Until 800 PM CDT

* At 656 PM CDT, severe thunderstorms were located along a line
  extending from near Citronelle to near Stapleton, moving west at 10
  mph.

  HAZARD...60 mph wind gusts and penny size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Saraland, Bay Minette, Chickasaw, Satsuma, Citronelle, Creola,
  Chunchula, Stapleton, Gulfcrest, Axis, I65 And I165, I65 And AL 158
  and Movico.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Large hail and damaging winds and continuous cloud to ground 
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3074 8817 3093 8834 3111 8837 3112 8836
      3111 8833 3114 8833 3114 8812 3088 8779
      3074 8778
TIME...MOT...LOC 2356Z 096DEG 8KT 3105 8815 3076 8787 

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

1 follow-up statement

691 
WWUS54 KMOB 130032
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
732 PM CDT WED JUL 12 2017

ALC003-097-130042-
/O.CAN.KMOB.SV.W.0198.000000T0000Z-170713T0100Z/
Mobile AL-Baldwin AL-
732 PM CDT WED JUL 12 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MOBILE AND WEST
CENTRAL BALDWIN COUNTIES IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning has been cancelled.  However gusty winds are
still possible with these thunderstorms.

LAT...LON 3074 8817 3093 8834 3111 8837 3112 8836
      3111 8833 3114 8833 3114 8812 3088 8779
      3074 8778
TIME...MOT...LOC 0028Z 096DEG 8KT 3106 8823 3077 8795 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 4:28 PM CDT	Special Weather Statement	MOB	Butler	47 min
Jul 12, 5:24 PM CDT	Special Weather Statement	MOB	Escambia	36 min
Jul 12, 6:02 PM CDT	Special Weather Statement	MOB	Baldwin	43 min
Jul 12, 6:17 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Mobile	43 min
Jul 12, 6:28 PM CDT	Special Marine Warning	MOB		62 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2017 Every severe thunderstorm warning in 2017

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.