Grid CO99 Band Conditions — Canada
Localized HF conditions for Maidenhead locator CO99. Coordinating at 59.50°, -121.00°. Updated with real-time telemetry from NOAA and DX cluster reports.
CO99 conditions are FAIR. Best bands: 10m, 20m, 30m, 40m, 60m. SFI: 137.
From Canada operating area, work the 11:25 UTC and 04:57 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses CO99.
After sunset, 20m transitions and 40m becomes the reliable DX fallback from this part of North America.
This square sits in Canada footprint and is best used as a planning center for portable, field-day, and home-station band decisions.
- Latitude zone
- upper mid-latitude
- Local phase
- Darkness
- Aurora exposure
- watch during geomagnetic storms
- Grayline
- 11:25 UTC / 04:57 UTC
- Best high band
- 10m
- Nearest city
- Canada operating area
● Local Band Quality Scorings
Use this local score for CO99, then compare the global live ranking oncurrent ham band conditionsbefore changing bands.
● Best DX Windows from CO99 — Canada operating area
Great-circle distance, short-path beam heading, the bands most likely open right now from CO99 to each DX region at SFI 137 / Kp 3, and a current verdict. "Open now" means a suitable band is scoring well on that path; "Try ~HH:MM" points at the next far-end grayline. Band picks and status are a planning heuristic, not a measurement.
| Target | Distance | Beam | Bands to try | Status |
|---|---|---|---|---|
| North America | 1,737 mi | 134° | 40m, 80m, 20m | Open now |
| Europe | 4,388 mi | 33° | 40m, 20m, 80m | Open now |
| East Asia / Japan | 4,467 mi | 299° | 10m, 15m, 20m | Open now |
| South America | 6,220 mi | 121° | 40m, 20m, 80m | Open now |
| South Asia | 6,703 mi | 342° | 10m, 15m, 20m | Open now |
| Oceania | 7,948 mi | 253° | 10m, 15m, 20m | Open now |
| Southern Africa | 9,638 mi | 49° | 40m, 20m, 80m | Open now |
● Band-by-Time Plan for CO99
A planning heuristic for the local day at CO99, built from sunrise 11:25 UTC, sunset 04:57 UTC, SFI 137, and Kp 3. Not a measurement — a starting point for where to listen as the day turns.
Grayline enhancement — low bands reach long distances as the terminator passes.
High bands rising with the sun; check 10m for DX.
Peak high-band window — 10m and 15m open widest.
Second grayline peak — 20m holds, then hands off to 40m.
Low bands own the darkness — 40m for DX, 80m regional.
Recent local activity
Spots touching CO99 and the adjacent squares
These are the newest 10m, 15m, and 20m reports where one side of the path sits in CO99, CP90, CO98, DO09, CO89. This gives the page unique, local context instead of a generic solar snapshot.
Top DX targets
Where this grid is reaching right now
Contest preview
Next major contest outlook
No contest event is currently loaded. For planning from CO99, start with 10m POOR, 15m POOR, 20m FAIR and keep 20m available as the safest all-around fallback.
Open contest calendarNearby grids