EF0 tornado, Narcoosee, Florida, August 27, 2012

1. EF065 to 85 mphthis tornado

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

2. EF186 to 110 mph

   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

EF0

Date

August 27, 2012

Touchdown

3:09 AM EDT (07:09 UTC)

Lifted

3:10 AM EDT (07:10 UTC)

On the ground

1 minutes

Path length

0.8 miles (1.3 km)

Path width

30 yards (27 m)

Deaths

0

Injuries

0

Property damage

$15,000

County

Osceola County

Touchdown point

28.271, -81.223

Lift-off point

28.275, -81.236

Record number

1208270109-01

Tropical Storm Isaac passed southwest of east-central Florida, making its closest approach during the late afternoon and evening hours of August 26. Two tornadoes developed during the morning of August 27 and several tropical storm force wind gusts were observed. County-averaged rainfall amounts over the 2-day period were as high as 10-12 inches within Okeechobee, Martin, St. Lucie and Indian River Counties, with isolated totals of 14-17 inches. A majority of the heavy rain fell from early morning through late afternoon of August 27, when flooding resulted in numerous, temporary road closures. Water entered many homes in Okeechobee and Indian River Counties due to over-topping of local creeks/canals and overwhelming of drainage systems.

An EF-0 tornado, with winds estimated near 65 mph, touched down in rural St. Cloud and destroyed an old, abandoned mobile home (floor attachment to the frame was severely rotted), then continued across a wooded lot and open, old citrus groves, causing minor-moderate shingle damage to a block home (house window was broken from debris impact), and minor shrub and fence damage within the yard of a neaby home. Insulation and small debris from the mobile home was carried downstream throughout the distance of the track. DI3 DOD6 Below LB; DI2 DOD1 EXP; DI27 DOD1 EXP.

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

No tornado warning for this county appears in the archive as in force at the moment the tornado touched down.

The county was under a tornado watch, issued at 03:25 UTC and running to 15:00 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 05:58 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.

Orlando International (MCO), 19 km from the path, in the two hours either side.

From the Iowa Environmental Mesonet's archive of airport observations.

The Melbourne radar (KMLB), 59 km away, was scanning. The volume nearest the touchdown began at 07:07 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.

The live radar over the trackEvery 2012 tornado in FloridaEvery tornado in Florida since 1950Warnings in force in Florida nowThe forecast where you are

2 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.