000
NOUS44 KBMX 142228
PNSBMX
ALZ038-151030-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
428 PM CST MON DEC 14 2020

...NWS DAMAGE SURVEY FOR 12/14/20 TORNADO EVENT...

.OVERVIEW...

A STRENGTHENING AREA OF LOW PRESSURE MOVED INTO CENTRAL ALABAMA
SHORTLY AFTER MIDNIGHT ON DECEMBER 14, 2020 AND TRACKED
EAST-NORTHEASTWARD GENERALLY ALONG THE INTERSTATE 20 CORRIDOR.
ALTHOUGH THERE WAS LITTLE TO NO OBSERVABLE INSTABILITY NEAR THE LOW
PRESSURE CENTER, ABUNDANT LOW-LEVEL WIND SHEAR WAS PRESENT AMIDST A
DYNAMIC LOWER ATMOSPHERE. NONETHELESS, CONDITIONS BECAME FAVORABLE
ENOUGH FOR A BRIEF TORNADO TO DEVELOP IN SOUTHWEST JEFFERSON COUNTY
NEAR THE LOW PRESSURE CENTER AND INTERSECTION OF THE DOWNSTREAM WARM
FRONT. THIS IS A SOMEWHAT INTERESTING CASE OF TORNADOGENESIS AS THERE
WAS NO OBSERVABLE LIGHTNING ASSOCIATED WITH THE PARENT LINE OF CONVECTION.
FURTHERMORE, THE FIRST INDICATION OF A TORNADO DEBRIS SIGNATURE OFF OF 
KBMX RADAR DID NOT YIELD ANY OBSERVABLE DAMAGE PER DAMAGE ASSESSMENT.

.DUSTY LANE TORNADO (JEFFERSON COUNTY)...

RATING:                 EF0
ESTIMATED PEAK WIND:    80 MPH
PATH LENGTH /STATUTE/:  4.8045 MILES
PATH WIDTH /MAXIMUM/:   350.0 YARDS
FATALITIES:             0
INJURIES:               0

START DATE:             12/14/2020
START TIME:             01:02 AM CST
START LOCATION:         1 ESE BESSEMER / JEFFERSON COUNTY / AL
START LAT/LON:          33.3637 / -86.9428

END DATE:               12/14/2020
END TIME:               01:08 AM CST
END LOCATION:           2 SSE ROSS BRIDGE / JEFFERSON COUNTY / AL
END LAT/LON:            33.3673 / -86.861

SURVEY SUMMARY:
THE TORNADO FIRST TOUCHED DOWN ON DUSTY LANE, CAUSING DAMAGE MAINLY TO
WEAKENED OR SHALLOW ROOTED TREES. THE TORNADO CROSSED MORGAN ROAD AND
CONTINUED EAST ACROSS AN INACCESSIBLE FORESTED AREA, CROSSING SHADES
CREEK AND THEN PASSING JUST BEHIND THE OAKS ON PARKWOOD BLVD. SCORES
OF TREES WERE EITHER UPROOTED OR SNAPPED IN THE AREA, AND MINOR
STRUCTURAL DAMAGE WAS NOTED AT THE OAKS. THE TORNADO CONTINUED EASTWARD
AND REACHED ITS PEAK INTENSITY AS IT CROSSED PARKWOOD ROAD JUST WEST OF
ALABAMA HIGHWAY 150, WITH A DOZEN OR SO VERY LARGE HARDWOODS UPROOTED,
CAUSING DAMAGE TO HOMES AND VEHICLES. THE TORNADO WAS ALSO ESTIMATED TO
BE AT ITS MAXIMUM WIDTH OF ABOUT 350 YARDS IN THIS AREA AS IT CROSSED AL
150. THE TORNADO NARROWED AND WEAKENED AS IT CROSSED ANOTHER AREA OF
FORESTED LAND, BEFORE SNAPPING AN OLDER TREE ALONG ROSS BRIDGE PARKWAY
JUST WEST OF DEER VALLEY ELEMENTARY SCHOOL, THEN SKIRTED THE NORTH END
OF THE CAMPUS BEFORE ASCENDING SHADES CREST MOUNTAIN, THEN RAPIDLY
DISSIPATING AS IT CROSSED SHADES CREST ROAD. SPECIAL THANKS TO JEFFERSON
COUNTY EMA FOR THEIR ASSISTANCE DOING DAMAGE ASSESSMENTS IN THE FORESTED
AREA BY UAS.

EF SCALE: THE ENHANCED FUJITA SCALE CLASSIFIES TORNADOES INTO THE
FOLLOWING CATEGORIES:

EF0...WEAK......65 TO 85 MPH
EF1...WEAK......86 TO 110 MPH
EF2...STRONG....111 TO 135 MPH
EF3...STRONG....136 TO 165 MPH
EF4...VIOLENT...166 TO 200 MPH
EF5...VIOLENT...>200 MPH

NOTE:
THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT AND PUBLICATION IN NWS
STORM DATA.

$$

DEBLOCK/SIZEMORE

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