Sorochany: when guns start and the season opens

4 forecasts (MET Norway, ECMWF, ICON, GFS) checked against 10 winters. Updated hourly, last at 14:51 Moscow time.

Too warm: snow cannot be made now.

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When can guns start

Weak window: 7 November, 07:00 to 12:00, 5 h, down to −3.1°, chance 81 %

For this spell: one fan gun about 58 m³ of snow, all guns about 1376 m³, wind up to 4 m/s.

What each forecast says: 4 of 4 forecasts see a window within seven days.
ForecastStartsHours for gunsColdest wet bulb
MET Norway7 November, 07:005−3.1°
ECMWF7 November, 07:004−2.8°
ICON7 November, 06:007−2.6°
GFS7 November, 08:002−2.4°

MET Norway hourly; ECMWF, ICON and GFS through Open-Meteo, fetched at 14:51.

Wet bulb
+0.4°
Air
+1.3°
Humidity
84 %
Wind
5 m/s
Precipitation in 24 h
0.5 mm

When the season starts: Sorochany

Our guide by cold hours: 7 December. Spread by past openings: 25 November to 14 December.

Confidence is medium: 10 past openings. Calculated 6 November.
Where the date comes from

Past openings: 27 November 2023, 9 December 2024, 18 December 2025. By those dates 179–472 cold hours had built up since 1 October.

This season so far: 3 cold hours, 73 is the ten-winter norm for today, 6 more in the forecast.

21 fan guns, 15 lances.

A cold hour is an hour at −2° wet bulb or colder. This is a weather guide, not the operator’s date.

Opening dates by season

What the operator says

Getting ready, no date yet. No date yet. The 25-season average is 5 December; last season opened on 18 December.

Operator’s post of 4 November · Telegram

Prices and runs

How to read this

Wet bulb is temperature adjusted for humidity. Guns start around −2° on this scale, not on the ordinary thermometer.

Grey: too warm. Darker blue: colder and better for guns. Percent of the gun’s top water flow, our estimate.

Yes means at least 6 hours in a row at about 30 % or more within three days. Our rule of thumb; the operator decides.

Only the operator and the webcam show whether guns are really running.

Wet bulb on one chart

+4°0°−2°−4° Sat 7Sun 8Mon 9Tue 10Wed 11Thu 12Fri 13 Now
Wet bulbAirSpread of ECMWF, ICON, GFSHours for guns Below −2° guns can work. Grey lines: other slopes.

Guns here: Sorochany

21 fan guns, 15 lances. Make: TechnoAlpin.

LOMOSREG, анкета курорта Сорочаны

Checked 6 November · Sorochany

Seven days on this slope

DayColdest wet bulbHours for gunsChanceSnow, one fan gunSnow, all gunsWater, all guns
6 November−1.0°019 %———
7 November−3.1°681 %66 m³1546 m³993 m³
8 November−0.6°017 %———
9 November+2.4°02 %———
10 November+0.7°013 %———
11 November0.0°022 %———
12 November+0.6°021 %———
13 November−1.8°048 %———

Upper bound: every gun at reference flow with enough water and pumps. Real output is lower.

Next 48 steps

All slopes now

SlopeGun nowWet bulbAir, humidity, windNext 7 daysWorth starting?
Leonid Tyagachev Ski Club, Shukolovo Cannot run +0.3° +1.4° · 82 % · 5 m/s Weak: 5 h from 7 November, 07:00
Sorochany Cannot run +0.4° +1.3° · 84 % · 5 m/s Weak: 5 h from 7 November, 07:00
Spas-Kamenka Cannot run +0.3° +1.4° · 82 % · 5 m/s Weak: 5 h from 7 November, 07:00
Stepanovo Cannot run +0.4° +1.5° · 81 % · 5 m/s Weak: 5 h from 7 November, 07:00
Tseleevo Cannot run +0.3° +1.4° · 82 % · 5 m/s Weak: 5 h from 7 November, 07:00
Volen Cannot run +0.4° +1.4° · 83 % · 5 m/s Weak: 5 h from 7 November, 07:00
Yakhroma Park Cannot run +0.4° +1.4° · 83 % · 5 m/s Weak: 5 h from 7 November, 07:00
Lata Trek, Krylatskoye Cannot run +0.5° +1.8° · 79 % · 4 m/s Weak: 3 h from 7 November, 08:00
Loza, Sergiev Posad Cannot run +0.3° +1.1° · 87 % · 5 m/s Wait: colder from 7 November, 08:00
Vorobyovy Gory / Sparrow Hills Cannot run +0.5° +1.6° · 82 % · 4 m/s Weak: 3 h from 7 November, 08:00
Kant, Nagornaya Cannot run +0.6° +1.6° · 83 % · 4 m/s Weak: 2 h from 7 November, 09:00
Olimp, Kolomna Cannot runWind 6.2 m/s: snow drifts +0.8° +1.7° · 86 % · 6 m/s Weak: 6 h from 7 November, 21:00
Freestyle Park, Dzerzhinsky Cannot run +0.6° +1.4° · 87 % · 5 m/s No window in 7 days
Guy Severin Ski Club, Chulkovo Cannot run +0.7° +1.4° · 88 % · 5 m/s No window in 7 days
Lisya Gora, Balashikha Cannot run +0.5° +1.4° · 85 % · 5 m/s No window in 7 days
  • Excellent, −7° and colder
  • Good, −4° to −7°
  • Marginal, −2° to −4°
  • Limit, −1° to −2°
  • Too warm

This shows what the weather allows, not whether guns are running. Operators decide by water, power and schedule.

Gun calculator

Enter the gun and the weather. The box shows how much snow it lays per hour and per night, and at what wind.

With nozzles and bore filled in, top flow is computed from them: Q = n × 0,7 × A × √(2Δp/ρ).

Result

— m³Snow per hour

— m³Snow for the shift

Gun works at
— %
Wet bulb
—
Water per shift
— m³
Layer on the area
— cm
Hours for that layer
—
Energy, guns only
— kWh
Snow density
— kg/m³
Lost to air and drift
— %

At what wind

WindSnow per hourPlume driftAdvice

An estimate for planning, not a manufacturer’s figure. The gun’s own chart beats this calculator. Assumptions are listed below.

Questions

When will snow guns start at Sorochany?

Weather allows it from 7 November, 07:00: 5 h down to −3.1°, chance 81 %. The operator decides when to start.

When will Sorochany open in 2026/27?

Past openings: 27 November 2023, 9 December 2024, 18 December 2025. By those dates 179–472 cold hours had built up since 1 October. With ordinary weather from now on, 368 cold hours are reached around 7 December. Spread by past openings: 25 November to 14 December. Confidence is medium: 10 past openings. This season so far: 3 cold hours, 73 is the ten-winter norm for today, 6 more in the forecast. A cold hour is an hour at −2° wet bulb or colder. This is a weather guide, not the operator’s date.

Which snow guns does Sorochany have?

21 fan guns, 15 lances. Make: TechnoAlpin.

What is the weather at Sorochany now?

Air +1.3°, humidity 84 %, wind 5 m/s, wet bulb +0.4°. Cannot run.

All slopes: Weather and snow guns