Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 211, NWS Mobile, AL

September 22, 2017Mobile County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Sep 22, 2017, 3:54 PM CDT for Mobile County, Alabama. It was in force for 23 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: Sep 22, 2017, 3:54 PM CDT (20:54 UTC)
Expired: Sep 22, 2017, 4:17 PM CDT
In force: 23 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Mobile County, AL

The radar

The Mobile radar (KMOB), 6 km from the middle of the area, began a volume at 20:58 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.

What was reported inside it

Time	Report	Where	Remark
Sep 22, 3:58 PM CDT	TSTM WND DMG	Mobile Airport, AL	A FEW POWER POLES WERE SNAPPED IN HALF NEAR THE MOBILE AIRPORT.

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

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.9 hours before the alert went out and 141 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: 1055 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1050 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

065 
WUUS54 KMOB 222054
SVRMOB
ALC097-222145-
/O.NEW.KMOB.SV.W.0211.170922T2054Z-170922T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
354 PM CDT FRI SEP 22 2017

The National Weather Service in Mobile has issued a

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

* Until 445 PM CDT

* At 354 PM CDT, a severe thunderstorm was located near Mobile
  Regional Airport, or 6 miles northwest of Tillmans Corner, moving
  southwest at 20 mph.

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

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Tillmans Corner, Semmes, I10 And I65 and Mobile Regional Airport. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3067 8841 3068 8841 3081 8825 3064 8810
      3050 8824
TIME...MOT...LOC 2054Z 051DEG 19KT 3064 8826 

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

1 follow-up statement

439 
WWUS54 KMOB 222117
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
417 PM CDT FRI SEP 22 2017

ALC097-222126-
/O.CAN.KMOB.SV.W.0211.000000T0000Z-170922T2145Z/
Mobile AL-
417 PM CDT FRI SEP 22 2017

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL MOBILE COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning has been cancelled.

LAT...LON 3067 8841 3068 8841 3081 8825 3064 8810
      3050 8824
TIME...MOT...LOC 2112Z 051DEG 19KT 3056 8837 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 22, 3:24 PM CDT	Special Marine Warning	MOB		66 min
Sep 22, 3:46 PM CDT	Special Weather Statement	MOB	Mobile	44 min
Sep 22, 3:58 PM CDT	Areal Flood Advisory	MOB	Mobile	2 hr
Sep 22, 4:16 PM CDT	Special Weather Statement	MOB	Mobile	44 min
Sep 22, 5:13 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.