Large Hail and Severe Weather of March 31, 2012

Event Summary for Central Alabama

On March 31, 2012, a strong upper level shortwave moved southward from the lower Ohio Valley interacting with unseasonably warm and unstable conditions across the southeast.  At the surface, a cold front moving into the Tennessee Valley triggered numerous severe thunderstorms during the afternoon, and those storms moved southward into Central Alabama during the evening hours along a strong outflow boundary.  Very cold air aloft (-17C at 500mb) and steep lapse rates led to the development of very large hail in any storm that developed.  Large hail reports from golfball (1.75) to teacup size (3 inches) were reported with some of the storms, as they were allowed to be sustained for well over 2 hours due to very high instability amounts.  The storms finally weakened during the late evening hours with the loss of daytime heating.  The information below is the PRELIMINARY storm reports from the March 31st severe weather event.

Event Photos

                           
                                       Hail near Oneonta, AL                                                                  Hail near Oneonta, AL
              Photo Submitted by Blount County EMA
                                                  Photo Submitted by Blount County EMA


                                           
                                              Large Hail in Altoona, AL                                                                         Hail in Altoona, AL
                                    Photo Submitted by Erin Crossley                                            Photo Submitted by Erin Crossley

Do you have any photos of large hail or damage from this event?  You can send your storm photos to us at SR-BMX.pix@noaa.gov, or upload them to our Facebook page on our wall!  We just might include your photo here on this webpage, and give appropriate credit for the photo.

 
Local Storm Report and Warning Information - Interactive Map

Click on the symbols and polygons below for Local Storm Report and Warning information from across Central Alabama on March 31st.  Very large hail was primarily reported across northern portions of the state during the evening hours.  You can zoom into the map using the mouse wheel or the plus (+) and minus (-) buttons at the top left corner of the map.


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Severe Weather Episode Data 

500 mb Mar 31 at 7 am
500 mb Analysis
  Mar 31 at 7 am
500 mb Mar 31 at 7 pm
  500 mb Analysis
  Mar 31 at 7 pm
Sfc Analysis Mar 31 at 1 pm
Surface Analysis
  Mar 31 at 12 pm
Surface Analysis Mar 31 at 7 pm
Surface Analysis
  Mar 31 at 830 pm
Day 1 Outlook 8 am
Day 1 Severe Weather Outlook
Issued Mar 31 at 8 am
Day 1 Outlook 8pm
Day 1 Severe Weather Outlook
Issued Mar 31 at 8 pm
Storm Reports for Mar 31
Storm Reports 03/31/12
Upper Air Sounding Mar 31 at 7 pm
Upper Air Sounding Mar 31 at 7 pm
 
 


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