Dmitri Moisseev

Professor @helsinkiuni and @INAR_fin, I study clouds and precipitation. Use #radar and other #remotesensing instruments @ACTRISRI.

[Dmitri Moisseev @HelsinkiRadar]

@ColeOsborne47 What was the wind direction? Could it be dust/debris plum coming from the lake?

[Landon Moeller @landon_wx]

Snow being generated by 4 different processes simultaneously near Chicago!

[Dmitri Moisseev @HelsinkiRadar]

@mikarantane @AriJLaaksonen @meteorologit See Heymsfield et al. (2011) "Formation and spread of aircraft-induced holes in clouds." Science (2011): 77-81. for the description of the mechanism. There was an altostratus cloud at about 3.5 km where a passing aircraft induced formation of ice particles

[Dmitri Moisseev @HelsinkiRadar]

@am_sundstrom The dust can be seen from the ground as well. Here is the ceilometer observations from Kumpula (https://t.co/GIjvIVMOjU). It is interesting to compare 31.3-1.4 and 9.4-10.4 events

[Dmitri Moisseev @HelsinkiRadar]

@Daaanvdb Any chance for elfstedentocht this winter?

[Dmitri Moisseev @HelsinkiRadar]

Congratulations to @TaruOlsson for the great job defending the thesis. Many thanks to @EloquentScience for stimulating and maintaining a very interesting discussion. @Dr_Pettersen your pre-examination of the thesis is highly appreciated.

[Max Maahn @mxmhn]

This week is the last chance to register for the 4th International Summer Snowfall Workshop 11 - 13 September 2023 in Leipzig
https://t.co/3iVYkDllgR

[Max Maahn @mxmhn]

Do you like snowflakes? Check out our new paper about the Video In Situ Snowfall Sensor https://t.co/SxI5czunQ9

[Max Maahn @mxmhn]

Please mark your calendars for the 4th International Summer Snowfall Workshop 11 - 13 September 2023 in Leipzig
https://t.co/zio9BGVeRW

[Dmitri Moisseev @HelsinkiRadar]

@LeonSimons8 @nephologue @AtmosFede @diegoaliaga2 @Atmosfera_UMSA @INAR_fin I think Tim’s point is, if there is an abundance of aerosols not all CCN will become cloud droplets, anyway. Adding more CCN (by fire for example) may not change anything. Whether it is true or not, depends on the background aerosol concentration, etc

[Dmitri Moisseev @HelsinkiRadar]

@LeonSimons8 @nephologue @AtmosFede @diegoaliaga2 @Atmosfera_UMSA @INAR_fin I agree with Tim that in this case the cloud was initiated by heat. But speaking more generally, to form a cloud we need moisture, process of cooling air (needed for supersaturation development) and aerosols

[Dmitri Moisseev @HelsinkiRadar]

@LeonSimons8 @nephologue @AtmosFede @diegoaliaga2 @Atmosfera_UMSA @INAR_fin I agree with Tim, the cloud was initiated by heat. But, some of smoke aerosols took part in the cloud droplets formation. Supersaturation development is a balance between cooling rate and condensation sink, which depends on CCN spectrum

[Dmitri Moisseev @HelsinkiRadar]

@Cyclogenesis_au @DopplerChase @70_dbz @ATMS_Illinois @mgroverwx @armnewsteam BTW, here is what you can do by combining Parsivel and MRR: https://t.co/2MuNmc0ydK

[Dmitri Moisseev @HelsinkiRadar]

@Cyclogenesis_au @DopplerChase @70_dbz @ATMS_Illinois @mgroverwx @armnewsteam We have two Parsivels next to PIP, ping me if you need data

[Dmitri Moisseev @HelsinkiRadar]

@nephologue @ProfGrantPetty Just include formation of cryptically sized embryo into consideration and one can argue that at some point less energy will be needed

[Dmitri Moisseev @HelsinkiRadar]

After avoiding COVID for 2 years, I tested positive just 9 hours before my flight to @EradSwitzerland . I will be following the conference online, thank you Alexis and Urs for the hybrid meeting

[Dmitri Moisseev @HelsinkiRadar]

@EGU_ACP A very promising data analysis method by @doppler_fan and co. Hope to see it applied to our @ACTRIS_Cloudnet measurements in @HyytialaHY

[Dmitri Moisseev @HelsinkiRadar]

@mikarantane @DPManchee It should not. Dual-polarization radar signatures of light rain and insects are very different