DREAM
Decision support from Real-time Emergency Advisory Model
Atmospheric Dispersion Prediction System
Radiological Impact Assessment Section, Radiological Safety Division,
Indira Gandhi Center for Atomic Research, Kalpakkam
with Meteorological support from
National Center for Medium Range Weather Forecast and
High Performance Computing support from IMSc, Chennai.
Today's Forecast
Click on the links below for viewing today's metereological forecast as 2 D surface layer image
Indian Peninsula (18 KM Resolution) Madras Region (6 KM Resolution)
Parameter 00 Hr IST 12 Hr IST Parameter 00 Hr IST 12 Hr IST
Surface Wind Sea Level Pressure View View Surface Wind Sea Level Pressure View View
Rainfall View View Rainfall View View
Temperature View View Temperature View View
Next Day Next Day
Surface Wind Sea Level Pressure View View Surface Wind Sea Level Pressure View View
Rainfall View View Rainfall View View
Temperature View View Temperature View View
Kalpakkam Region (2 KM Resolution)
Parameter 18 Hr IST 00 Hr IST 06 Hr IST 12 Hr IST
Surface Wind Sea Level Pressure View View View View
Rainfall View View View View
Temperature View View View View
Next Day
Surface Wind Sea Level Pressure View View View View
Rainfall View View View View
Temperature View View View View
     Today's Simulated Dispersion Forecast for Kalpakkam Region     
Parameter Time in IST
Thyroid Dose -04 hr -02 Hr 00 Hr 02 Hr 04 Hr 06 Hr 08 Hr 10 Hr 12 Hr 14 Hr 16 Hr
18 Hr 20 Hr 22 Hr 24 Hr 26 Hr 28 Hr 30 Hr 32 Hr 36 Hr 38 Hr 40 Hr
Assessment of radiological impact during an offsite emergency in real-time is an important component of Decision Support System for emergency management and mitigation. IGCAR has implemented an operational atmospheric model as a LIVE TOOL that predicts 48 Hr forecast of the plume spread based on the national meteorological data as initial and boundary condition. The meteorological model MM5 is initialised at 00:00GMT (05:30 IST) using the analysis data provided by NCMRWF and run for the southern peninsula in a coarse grid mesh as mother domain and two other successive inner domains of northern Tamilnadu and Kalpakkam with three times higher grid resolution respectively.

The parallel code has been successfully implemented and tested in single board 8 processor shared memory at IGCAR, 9 node dual Xeon Gigabit Ethernet network cluster, 8 node dual Xeon Scali pilot cluster with SCI interconnect and on 16 node dual Xeon with SCI Interconnect on the 144 node Kabru, all at The Institute of Mathematical Sciences, Chennai.

The daily forecast is displayed on this web page. The output displayed are: surface pressure, wind, temperature and rainfall for all the domains and the hypothetical plume dispersion in the fine domain around Kalpakkam. At present, one isotope namely I-131 with a release rate of 1Bq/s is considered for calculations. The dispersion output will show
the simulated concentration distribution and Thyroid Dose(Sy) for 48 hours.

Please send your comments / suggestions to: rv AT igcar.ernet.in