Grid JM99 Band Conditions — Western/Central Europe
Localized HF conditions for Maidenhead locator JM99. Coordinating at 39.50°, 19.00°. Updated with real-time telemetry from NOAA and DX cluster reports.
JM99 conditions are FAIR. Best bands: 10m, 12m, 15m, 17m, 20m. SFI: 137.
From Western/Central Europe operating area, work the 03:34 UTC and 18:08 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses JM99.
European evening operation usually shifts toward 20m and 40m once the high bands soften.
This square sits in Western/Central Europe footprint and is best used as a planning center for portable, field-day, and home-station band decisions.
- Latitude zone
- mid-latitude
- Local phase
- Darkness
- Aurora exposure
- low at this latitude
- Grayline
- 03:34 UTC / 18:08 UTC
- Best high band
- 10m
- Nearest city
- Western/Central Europe operating area
● Local Band Quality Scorings
Use this local score for JM99, then compare the global live ranking oncurrent ham band conditionsbefore changing bands.
● Best DX Windows from JM99 — Western/Central Europe operating area
Great-circle distance, short-path beam heading, the bands most likely open right now from JM99 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 |
|---|---|---|---|---|
| South Asia | 3,637 mi | 91° | 40m, 20m, 80m | Open now |
| Southern Africa | 4,548 mi | 173° | 40m, 20m, 80m | Open now |
| North America | 5,710 mi | 316° | 10m, 15m, 20m | Open now |
| East Asia / Japan | 5,936 mi | 45° | 40m, 20m, 80m | Open now |
| South America | 6,206 mi | 250° | 40m, 20m, 80m | Open now |
| Oceania | 9,615 mi | 92° | 40m, 20m, 80m | Open now |
● Band-by-Time Plan for JM99
A planning heuristic for the local day at JM99, built from sunrise 03:34 UTC, sunset 18:08 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 JM99 and the adjacent squares
These are the newest 10m, 15m, and 20m reports where one side of the path sits in JM99, JN90, JM98, KM09, JM89. 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 JM99, start with 10m POOR, 15m POOR, 20m FAIR and keep 20m available as the safest all-around fallback.
Open contest calendarNearby grids
Four adjacent squares for internal path checking
Regional hub links