David Helms Profile picture
Mar 29 8 tweets 5 min read Twitter logo Read on Twitter
1/ Heavy Precipitation/Snowfall *ALERT*
Wednesday Evening (MAR 29) to Friday Morning (MAR 31)
* Heavy snow likely in Luhansk and Donetsk
* Drone operations will be severely restricted
* Trafficability will be severely restricted
* Rising water will make creeks dangerous to ford
2/ 10 Day Forecast of weather for Bakhmut and Kreminna shows rate of precipitation, snowfall, & snow depth Thursday-Friday. Additional rainfall next WED. Most snow will melt by Saturday. Melting snow will make trafficability extremely difficult & rising creeks impassable.
3/ Comparing major global weather models, but agree on extreme precipitation potential next 72 hours (50-75 mm), but position of maxima varies by about 100 km which is relevant to the line of conflict.
4/ Snowfall (how much snow falls from the sky) amount and location varies by model to model, but all show significant snowfall, 30 to >50 cm, east of line of conflict (LoC) and substantial snowfall, 10-30 cm, west of the LoC.
5/ Snow depth [lower right] (snow remaining on ground) will be much less than snowfall [upper right] with temperatures >= freezing (0C) and ground temperature above 0C. In these conditions, small differences in elevation are important (more snow accumulation = greater elevation)
6/ All weather models melt snow on ground (e.g., snow depth) very quickly, almost all gone by Sunday (APR 2). Snow melt water will cause creeks to rise rapidly making creek crossing impossible or dangerous if attempted with wheeled vehicles. #NAFOWeather /end
FYI... Ground ground temperature in the east is +4 to +6C (surface to 10 cm)

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More from @davidhelms570

Mar 28
13.1/ This 🧵 is a follow-up to the soil moisture variance (tweet 13) providing some recent climate data details for comments included on the table.
13.2/ Temperature and precipitation along the Line of Conflict (LoC) at control points. April and May have the greatest temperature increase but lower precip from winter and summer seasons = increasing evapotranspiration (ET) (e.g., soil water loss). Source: @meteoblue
13.3/ Ukraine spring season (MAM) maps show northwest to southeast gradient of lower to higher temperatures & higher to lower precipitation indicating lower to higher ET/water loss. Source: University of East Anglia
crudata.uea.ac.uk/~timo/climgen/…
Read 12 tweets
Mar 27
1/ Back on March 2, 2023, @DefenceHQ declared it to be #MudSeason, Ukrainian as ‘bezdorizhzhia’, limiting cross country movement (CCM)/trafficability. This #NAFOWeather🧵 looks at when soil will dry sufficiently to support offensive operations.
2/ Most of the techniques referenced in the analysis originate from the #NATO Reference Mobility Model (NRMM). Documents describing the NRMM are public domain.
Cite: slideshare.net/QuestSystems/a…
3/ Processes which control vehicle trafficability are ground pressure exerted by vehicles and strength of soil. As soil dries, it can support a greater load. In addition to military applications, agriculture and land managers assess soil strength to minimize impact to vegetation.
Read 15 tweets
Feb 1
1/ Who is operating the Kakhovka Hydroelectric Power Plant (K-HPP)? What have K-HPP operator done that has caused the Kakhovka Reservoir to drop to 30 year low levels risking drinking water for millions and irrigation for 250 million hectares? A #NAFOWeather 🧵
2/ Kakhovka HPP is the 6th (and final) dam on the Dnipro River. The purpose of the dam is to provide water for irrigation, drinking, industry, shipping. K-HPP maintains Kakhovka Reservoir at 16m above MSL providing water for irrigation canals (e.g. NCC) & the Zaporizhzhia NPP. Image
3/ Who is operating the Kakhovka HPP?
Russians have occupied & operated the K-HPP since about March 1, 2022. Initially, the Ukrainian dam operator, @Ukrhydroenergo, provided technical assistance to Russian operators, but competent staff technical advise ceased after spring 2022. Image
Read 21 tweets
Jan 29
23/ Finishing the Kakhovka HPP and Reservoir and NCC thread ...
24/ Aftermath of 11 NOV 2022 Russian attack on the K-HPP showed the destruction of the road and bridge decks above 3 sluice gates nearest the right bank. Thankfully, the 3 sluice gates appear to be holding water so the immediate threat of a flood averted.
25/ With the retreat completed from the right bank, the value of the K-HPP and reservoir have changed again. Since early December 2022, Russian K-HPP operators have been releasing huge amounts of water (about 3 km**3!) causing the Kakhovka Reservoir to drop to historic low levels
Read 17 tweets
Jan 29
1/ Using dam operations (water realease) data to assess the importance of the Kakhovka HPP (K-HPP) dam and reservoir and North Crimean Canal to Russian political and military priorities, a #NAFOWeather🧵
2/ It has been almost a year since the (most recent) Russian invasion of Ukraine. Russian propaganda tries to obscure true motivations for its invasion. Looking back helps separate Russian stated "initial war aims" mis-information (below) from true objectives.
3/ On the 8th anniversary of Crimea's occupation (18 MAR 2022) Putin said "These were essential things such as gas and power supply, utility infrastructure, restoring the road network, and construction of new roads, motorways and bridges” but also said “There is more to it."
Read 25 tweets
Nov 13, 2022
On November 11, 2022, the Russians exploded charges on the 3 dam gates on the north side (right bank) of the Kakhovka HPP Dam along with the road and railroad deck over the dam. #NAFOWeather @Maxar image
What is the Russian intention? Minimally, to stop UAF pursuit of the retreating Russian troops. Russians have also destroyed the Kherson energy infrastructure as part of their retreat. This is part of a systemic plan to cripple the Ukrainian economy.
But clearly, draining the Kakhovka dam may not be a Russian priority as it feeds the Crimean Canal which provides water to Crimea. In fact, restarting the flow of water was one of the first priorities after capturing the canal
nationalpost.com/pmn/news-pmn/c…
Read 8 tweets

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