Severe Weather on November 16th, 2011 


Event Summary for Central Alabama

On Tuesday, November 15th, moisture began streaming northward from the Gulf of Mexico. The moisture surge was just ahead of an approaching upper level low.  Surface dew points climbed into the middle 60s and created increased atmospheric instability late Tuesday night.  As the upper low approached, deep layer shear increased and led to increased storm relative helicities (SRH) in the lowest levels of the atmosphere. This set the stage for supercell development in Central Alabama.  By 5 am Wednesday morning, dew points had increased into the upper 60s and 0-1km SRH of 300-400 m2/s2 across Sumter and Marengo Counties.  By 745 am, one supercell dropped 2 tornadoes in these counties.  Similiar severe weather parameters advected across Central Alabama through the morning hours and caused additional  supercell development near Montgomery, Auburn and Opelika.  The information below is the PRELIMINARY (subject to change) summaries of the tornadoes from this day:

 
Location/Clickable Detailed Summary Link
Damage Rating/Estimated Maximum Wind Speeds
Injuries/Fatalities
Damage Path Length/Width
Starting Point/Time
Ending Point/Time
EF-2
120 mph
1 Injury
1.5 miles
600 yards
32.3633/-88.0894
707 am
32.3763/-88.0689   709 am
EF-0
85 mph
None
2.75 miles
250 yards
32.4813/-87.8567
732 am
32.5032/-87.8174
736 am
EF-1
90 mph
None
0.88 miles
75 yards
32.3867/-88.2184
1108 am
32.3977/-88.2107
1110 am
EF-1
110 mph
EF-2 in Georgia
2 Injuries
33.39 miles
700 yards
32.5369/-85.6566
1152 am
32.6970/-85.1173
1235 pm
 
 
          

Pertinent Geographic Information Systems (GIS) Data from this Event


Preliminary Local Storm Reports
 

Severe Weather Episode Data 

Surface analysis 3 am
Surface Analysis
Nov 16 3 am
Surface Analysis 6 am
Surface Analysis
  Nov 16 6 am
Sfc Analysis 9 am
Surface Analysis
Nov 16 9 am
Surface Analysis 12 pm
Surface Analysis
Nov 16 12 pm
Day 1 Outlook 6 am
Day 1 Severe Weather Outlook
Issued Nov 16 at Midnight
Day 1 Outlook 7 am
Day 1 Severe Weather Outlook
Issued Nov 16 at 7 am
Storm Reports
Storm Reports 11/15/11
Storm Reports
Storm Reports 11/16/11
06z sounding from BMX
12am Upper Air Sounding from BMX on Nov 16
12z Sounding from BMX
6am Upper Air Sounding from BMX on Nov 16
 


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