National Weather Service United States Department of Commerce

Event Summary

A deep (open) longwave trough was present with the upper level jet axis positioned across the Mid Mississippi Valley region during the early morning hours of the 1st. At 500 millibars, the 1200 UTC analysis showed a near 100 knot jet axis stretching across the Tennessee Valley region with additional jet energy in the base of the trough across the Central Plains. Meanwhile, the 850 millibar analysis at 1200 UTC (on the 1st) showed very strong thermal and moisture advection with dewpoints in excess of +12 Celsius feeding from the Gulf of Mexico northward well across the Deep South and Tennessee Valley. This resulted in a broken line of quasi-discrete storms that moved across the region from the late morning hours into the mid afternoon ahead of a slow moving cold front. Several storms exhibited supercellular characteristics with notable mid level rotation. These storms produced several instances of large hail across the TN Valley, along with damaging straight-line winds in a few locations. 

 
Storm Reports
Tornado watch # 57 was issued at 11:50 AM. Click to image to view the storm reports.

Upper Air Charts

 

250mb Chart at 6am March 1st

500mb Chart at 6am March 1st

850mb Chart at 6am March 1st

250mb Chart at 6pm March 1st

500mb Chart at 6pm March 1st

850mb Chart at 6pm March 1st

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Surface Charts

 

3pm March 4th

6pm March 4th

9pm March 4th

Midnight March 4th

6 am March 5th

Noon March 5th

Very strong wind shear between 50 and 75 knots at 03/01/2017 at 17Z.  Steep mid-level lapse rates were in place around the same time at 18Z.

Upper Air Soundings

 

KBMX Sounding 6am March 1st

 

 

 

UAH Sounding 1 pm March 1st

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SPC Outlooks

 

Day 1 Outlook 
Issued 10:30 am March 1st

 

Day 2 Outlook 
Issued 11:30 am February 28

Day 3 Outlook
Issued 2:30 am February 27

Day 1 Tornado Probability
Issued 10:30 am March 1st

Day 1 Wind Probability
Issued 10:30 am March 1st

Day 1 Hail Probability
Issued 10:30 am March 1st

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Event Images

 


Quarter size hail fell in the Creekwood Subdivision of Huntsville (Courtesy of Stephen Latimer)

Two inch in diameter hail fell in the Charity area of Moore County. (Courtesy of )

Two inch in diameter hail fell in the Ider community (Courtesy of Michael Posey)

Quarter and slightly large hail 4 miles north of Arab. (Courtesy of WAFF)
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