EF1 tornado, (Nrb)Nas Mayport to Tisonia, Florida, June 6, 2013

1. EF065 to 85 mph

   Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

2. EF186 to 110 mphthis tornado

   Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

3. EF2111 to 135 mph

   Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.

4. EF3136 to 165 mph

   Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.

5. EF4166 to 200 mph

   Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

6. EF5over 200 mph

   Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.

7. Unrated

   The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.

Rating

EF1

Date

June 6, 2013

Touchdown

4:48 PM EDT (20:48 UTC)

Lifted

5:12 PM EDT (21:12 UTC)

On the ground

24 minutes

Path length

18.9 miles (30.4 km)

Path width

704 yards (644 m)

Deaths

0

Injuries

0

County

Duval County

Touchdown point

30.390, -81.400

Lift-off point

30.660, -81.450

Record number

1306061448-01

Tropical Storm Andrea crossed the forecast area from the Gulf of Mexico. SE Ga and NE Fl were on the northeast side of the storm...which focused onshore convergent bands. A few tornadoes were spawned along the Duval and Nassau county Atlantic coasts...with gusty tropical storm force winds and locally heavy rainfall over inland areas. Twenty-four hour rainfall amounts ranged from 1 to 4 inches...with the highest value of 3.62 inches 4 ESE of Waycross. Rainfall amounts decreased to the SE with an observation site 5 NNW of Spuds only reporting 0.06 inches. Wind gusts of 30 to 40 mph were common along the coast and estuary systems. The highest gust over northeast Fl was 38 knots measured at Naval Air Station Jacksonville from the south on the 6th at 11:06 pm. The highest gust over southeast Georgia was 39 knots measured from the WNW at 6:28 am at the St. Simons Airport. The highest wind gust along the coast was reported from a WeatherFlow (mesonet) station located at the Jacksonville Beach Pier with a speed of 72 knots reported at 4:37 pm on the 6th. This gust was likely caused by a passing waterspout that moved onshore near Mayport. The lowest pressure measured was from the Jekyll Island WeatherFlow (mesonet) station of 993.0 mb on the 7th at 12:30 am. The highest wind gust measured over the adjacent Atlantic waters was 39 kts at buoy 41012 43 NM east of St. Augustine on the 6th at 10:50 pm. The C-Man station SAUF1 in St. Augustine measured a gust to 42 knots on the 6th at 7:58 pm.

An NWS survey determined an EF1 tornado with winds of 75 to 90 mph impacted the extreme eastern side of Mayport Naval Station. Several non-critical structures were impacted with minor damage. The length of the tornado across the base was .32 miles however it is likely the funnel continued into the river as a waterspout. The maximum width just before it entered the river was 0.1 miles (176 yards). Damage was generally confined to roof damage and broken windows. At 5:12 pm, there was a report of a tornado on the ground in Fernandina Beach near the 1300 block of North Fletcher Ave. The NWS survey revealed that EF1 intensity of 100 mph winds impacted Amelia Island. The storm cross the beach along A1A south of Rachael Ave and progressed north-northwest near and east of Egans Creek. The tornado passed through the Starboard Landing neighborhood with 80 to 100 mph winds and ended near Sunrise Drive. The path was approximately 2.25 miles and the maximum width was 0.4 miles or about 2,050 feet near Jasmine Street.

From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.

5 minutes of warning. NWS JAX issued a tornado warning for this county at 20:43 UTC, 5 minutes before the tornado touched down, in force until 21:01 UTC.

The county was under a tornado watch, issued at 14:43 UTC and running to 01:52 UTC.

Every warning and watch covering the touchdown point that day, from the Iowa Environmental Mesonet's archive of National Weather Service products. Lead time is measured from the issue of the warning in force to the touchdown time in the database, both of which were recorded to the minute by different people.

The Storm Prediction Center had this point in a Slight Risk, with a 0.05 chance of a tornado within 25 miles. The outlook in force was issued at 20:01 UTC.

SPC's Day 1 convective outlook as it stood when the tornado began, read at the touchdown point. The same archive is on the radar archive.

The radiosonde launches on either side of the tornado, from the nearest station that was launching then, drawn and analyzed the way Storm Lab does: the same diagram, the same parcel and shear definitions SPC's mesoanalysis uses.

The Jacksonville radar (KJAX), 27 km away, was scanning. The volume nearest the touchdown began at 20:45 UTC.

Open the radar archive at this moment, over the track

Reflectivity and velocity, decoded from the Level II archive in the browser. Volumes take a few seconds to open the first time.

Local storm reports within 60 km of the path, in the three hours either side.

From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.

The live radar over the trackEvery 2013 tornado in FloridaEvery tornado in Florida since 1950Warnings in force in Florida nowThe forecast where you are

9 more were confirmed in the United States that day.

Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.

NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.