KCYS radar — Cheyenne, WY
KCYS is the National Weather Service's WSR-88D Doppler radar for the Cheyenne area, operated with the NWS office CYS. View it live in TALON — the loop, super-res reflectivity, storm-relative velocity, rotation and correlation coefficient.
| Station | KCYS (Cheyenne, Wyoming) |
|---|---|
| Location | 41.1520°, -104.8060° · Laramie County |
| Elevation | 6,191 ft above sea level |
| Type | WSR-88D (NEXRAD) S-band dual-polarization Doppler radar |
| Products in TALON | Super-res reflectivity (0.25 km), velocity, storm-relative velocity, rotation (azimuthal shear), correlation coefficient PRO |
How high can KCYS see?
A radar beam travels in a nearly straight line while the Earth curves away underneath it, so the farther a storm is from KCYS, the higher above the ground the radar is looking. Tornadoes start in the lowest few thousand feet, so storms close to the radar show low-level rotation much better.
| Distance from KCYS | Lowest scan (0.5°) | Next scan (1.5°) |
|---|---|---|
| 10 mi | 500 ft | 1,400 ft |
| 25 mi | 1,500 ft | 3,800 ft |
| 50 mi | 3,600 ft | 8,200 ft |
| 75 mi | 6,300 ft | 13,200 ft |
| 100 mi | 9,600 ft | 18,800 ft |
| 150 mi | 18,200 ft | 32,000 ft |
Height of the beam's center above the radar, using standard refraction. Terrain can raise or block the beam.
Severe weather inside KCYS's range
Since 1950, NOAA has recorded 465 tornadoes within 60 miles of the KCYS radar, 28 of them rated EF2/F2 or stronger. They have been most common in June and May. The strongest was an EF3 on May 22, 2008, which passed about 34 miles south-southwest of the radar and caused 1 death. The most recent was an EF1 on June 17, 2025, which touched down about 34 miles west-northwest of the radar.
Hail: 2,251 reports of hail 1 inch or larger within 60 miles of the KCYS radar since 1955, 252 of them 2 inches or larger. The largest was 5.00-inch hail (grapefruit size) on June 8, 1968.
| Tornadoes since 1950 | 465 |
| EF2/F2 or stronger | 28 |
| Strongest tornado | EF3 · May 2008 |
| Busiest tornado month | June |
| Largest hail | 5.00 in · Jun 1968 |
Source: NOAA Storm Prediction Center severe weather database — tornadoes 1950–2025, hail 1955–2025 (the latest year is preliminary). Distances are to each tornado's recorded track; ratings before February 2007 use the original Fujita (F) scale.
Cities covered by KCYS
- Denver, CO 98 mi south
- Colorado Springs, CO 160 mi south
Nearby radars
- KFTG · Denver/Boulder, CO 95 mi
- KPUX · Pueblo, CO 189 mi
- KGLD · Goodland, KS 205 mi
- KLNX · North Platte, NE 226 mi
- KUDX · Rapid City, SD 229 mi
KCYS radar FAQ
How often does KCYS update?
Every NEXRAD radar completes a full scan about every 4–6 minutes in storm mode, and repeats the lowest tilt more often (SAILS) during severe weather. TALON loads each new scan as it arrives.
What is the range of KCYS?
Reflectivity reaches about 290 miles and velocity about 185 miles, but useful low-level detail is within roughly 100 miles — see the table above.
Is KCYS down?
Radars occasionally go offline for maintenance. When one does, TALON's US radar map fills the gap from neighboring radars (KFTG, KPUX, KGLD).