Live/Radar/Every radar/KMRX
Single radar / Tennessee
Knoxville radar KMRX
The weather service radar at Knoxville, Tennessee, alone: each picture it makes from its own scans, at four tilts from its lowest up, every few minutes. Reflectivity, velocity, storm relative velocity, correlation coefficient and differential reflectivity, the storms it tracks and where they are headed, and how high its beam passes. How to read them.
- Latest scan
- Scanning
- Precipitation mode, pattern 215
- Tilts
- 0.5°, 1.3°, 2.4°, 3.1°
- Stands at
- 36.168°N 83.402°W, 1,337 ft above sea level
- Reaches
- 286 mi with reflectivity, 186 mi with velocity, 143 mi with storm relative velocity
Storms it tracks
The radar follows each storm cell from scan to scan, measures the way it is moving, and puts it ahead 15 to 60 minutes. Each is drawn on the map above, its track to the hour ahead marked each quarter hour.
| Storm | Where | Moving | In 30 minutes | In 60 minutes | Last forecast off by |
|---|---|---|---|---|---|
| G6 | 117 mi east northeast of the radar117 mi from the radar, bearing 61° | Toward the north at 52 mph | 132 mi northeast of the radar | 151 mi northeast of the radar | 0.2 mi |
| Z3 | 6 mi west southwest of Cullowhee, NC62 mi from the radar, bearing 174° | Toward the north at 55 mph | 13 mi north northeast of Cherokee, NC | 5 mi east southeast of White Pine, TN | 0.5 mi |
| C8 | 4 mi southwest of Mosheim, TN23 mi from the radar, bearing 93° | Toward the north northeast at 77 mph | - | - | 3.8 mi |
| F6 | 4 mi north of Shelby, NC120 mi from the radar, bearing 118° | First seen this scan | - | - | 0 mi |
| D6 | 5 mi northwest of West Marion, NC81 mi from the radar, bearing 113° | Toward the north at 53 mph | 8 mi southwest of Banner Elk, NC | 5 mi west southwest of Mountain City, TN | 0.6 mi |
| Q3 | 7 mi southeast of Whitesburg, KY71 mi from the radar, bearing 31° | Toward the north at 52 mph | 7 mi west southwest of Pikeville, KY | 15 mi east of Paintsville, KY | 0.6 mi |
| W2 | 2 mi west of Sneedville, TN27 mi from the radar, bearing 19° | Toward the north northeast at 36 mph | 10 mi east southeast of Harlan, KY | 8 mi west northwest of Cumberland, KY | 0.7 mi |
| X6 | 2 mi east of Rogersville, TN29 mi from the radar, bearing 55° | Toward the north northeast at 46 mph | - | - | 3.6 mi |
| Q4 | 2 mi east of Harlan, KY47 mi from the radar, bearing 8° | Toward the north at 47 mph | 6 mi south southwest of Hazard, KY | 9 mi east southeast of Jackson, KY | 1.3 mi |
| O3 | 1 mi west southwest of Mount Carmel, TN48 mi from the radar, bearing 56° | Toward the north at 48 mph | 67 mi northeast of the radar | 7 mi northeast of Jenkins, KY | 0.2 mi |
| W6 | 11 mi south southeast of Cumberland, KY52 mi from the radar, bearing 30° | Toward the north northeast at 53 mph | - | - | 2.9 mi |
| P6 | 8 mi southwest of Coal Run Village, KY98 mi from the radar, bearing 24° | Toward the north northeast at 45 mph | 14 mi east northeast of Prestonsburg, KY | 10 mi east southeast of Louisa, KY | 1.3 mi |
| C6 | 10 mi south of Hazard, KY66 mi from the radar, bearing 10° | Toward the north northeast at 51 mph | 91 mi north of the radar | - | 2.4 mi |
| G7 | 6 mi north northwest of Surgoinsville, TN39 mi from the radar, bearing 46° | Toward the north northeast at 70 mph | 8 mi east southeast of Whitesburg, KY | - | 2.6 mi |
| M5 | 12 mi east northeast of Harrogate, TN33 mi from the radar, bearing 355° | Toward the north at 54 mph | - | - | 3.7 mi |
| N6 | 7 mi east northeast of Newport, TN21 mi from the radar, bearing 120° | Toward the north northeast at 41 mph | 7 mi south of Rogersville, TN | - | 2.8 mi |
| H7 | 10 mi east southeast of Gatlinburg, TN36 mi from the radar, bearing 176° | Toward the north at 55 mph | 3 mi south of White Pine, TN | 6 mi south of Sneedville, TN | 0.8 mi |
| L5 | 9 mi west of Sneedville, TN27 mi from the radar, bearing 3° | First seen this scan | - | - | 0 mi |
How high it sees
The beam leaves the radar tilted up and the earth curves away under it, so the farther from the radar, the higher it passes. Rain or snow falling under the lowest beam is not seen: far from the radar, shallow snow and drizzle can fall unseen. The heights are the standard ones, the air bending the beam as the weather service’s own rule takes it.
| Tilt | 25 mi | 50 mi | 100 mi | 150 mi | 200 mi |
|---|---|---|---|---|---|
| 0.5° | 1,500 ft | 3,600 ft | 9,600 ft | 18,200 ft | 29,200 ft |
| 1.3° | 3,300 ft | 7,200 ft | 17,000 ft | 29,300 ft | 44,000 ft |
| 2.4° | 5,800 ft | 12,300 ft | 27,200 ft | 44,500 ft | 64,400 ft |
| 3.1° | 7,500 ft | 15,600 ft | 33,600 ft | 54,200 ft | 77,400 ft |
| Width | 2,200 ft | 4,400 ft | 8,800 ft | 13,100 ft | 17,500 ft |
How to read the pictures
- Reflectivity
- How strongly rain, snow and hail send the pulse back, in dBZ: the stronger, the heavier.
- Velocity
- The wind along the beam, in mph: green toward the radar, red away. Where the two meet tightly, the wind turns.
- Storm relative velocity
- The same wind with the storms’ own motion taken away, so a storm’s turning stands out: a tight pair of green and red is a rotating storm.
- Correlation coefficient
- How alike the returns of one pulse are, 0 to 1: rain and snow near 1, hail and melting snow lower, and debris a tornado lifts well below 0.8.
- Differential reflectivity
- How much wider than tall what falls is, in dB: large flat raindrops read high, hail and dry snow near 0.
Each picture is one tilt of one scan, as the radar sent it: its lowest tilt first, then three above it, the angles its scan pattern sets. A picture at a higher tilt sees higher into a storm, and farther over the ground at each distance. Press a point on the map to read the value there.
As data: /radar/now.json?show=sref&site=KMRX, the times of its frames, and /radar/s/KMRX/storms.json, the storms it tracks.