We forecast the temperature. You raise the line rating. We forecast the wind. You get there first. We forecast the frost. You save the crop. We forecast the ice. You grit before it forms. We forecast the rain. You draw the reservoir down. We forecast the heat. You size the evening peak. We forecast the mud. You pick the route.

Hradec

V441 · Hradec — Výškov

LAT/LON

50.3630° N  13.2810° E

Alt

322 m

T conductor

−1.8 °C

Icing rate

1.2 mm/h

Line rating

−2 % headroom

Alert

De-rate V441 to 2 060 A and hold until the icing rate falls below 0.2 mm/h.

T+12 h

Mezní Louka · 50.8790° N 14.3230° E

Expected

0.47 km²

90 % core

0.17 km²

10 % envelope

1.49 km²

Head ROS

168 m/h

Wind

7.5 m/s from 235°

Spreading

Hold the line on the eastern ridge. The 10 % envelope is three times the expected perimeter — commit resources to the head, not the flanks.

Sink

50.5440° N  14.0508° E

Min temp

−4.8 °C

At

04:12

Below −2 °C

4.7 h

Elevation

147 m

Aspect

N · 14.5 %

Severe

Cold air ponds here all night. Protection must already be running before the pool forms — once it has, wind machines have no inversion left to mix down.

most Vysočina

D1 · bridge deck

Surface

−2.4 °C

Approach

+0.5 °C

Dew point

+1.8 °C

Air

+2.4 °C

Deck length

430 m

Black ice

The deck is below freezing while the approach either side is not, and the dew point is above both — moisture is depositing onto the span and freezing clear. Treat the structure ahead of the route.

Karlín

Aug 2002 · 5 160 m³/s

Water depth

3.7 m

District under

100 %

Water level

190.2 m

Ground

186.3 m

Extent

6.64 km²

Inundated

Water stands 3.7 m over Rohanské nábřeží and covers the whole district. The last two metres arrive between Q100 and peak, so the evacuation decision has to be taken at the Q100 threshold, not at the peak forecast.

Old Town

Medieval core

At 03:00

22.5 °C

Above rural

+5.1 °C

Sky view

0.22

Built

63 %

Mean height

18 m

Tropical night

The canyon sees a fifth of the sky, so the heat it stored today has nowhere to radiate. It never drops below 20 °C — residents get no overnight recovery, which is the exposure that fills hospital beds, not the afternoon peak.

+60 mm

VVP Libavá · wheeled, 30 % limit

Route

12.9 km

Moving time

40 min

Detour

+68 %

Max gradient

29 %

No-go ground

17 %

Route degraded

The valley floors have lost bearing capacity and the direct line is 15 % no-go. The routed line adds 3.6 km and 28 minutes but stays on ground that will take a wheel — the terrain did not change, the soil did.