OVERVIEW: THE INVESTIGATION OF MICROPHYSICS AND PRECIPITATION FOR ATLANTIC COAST-THREATENING SNOWSTORMS (IMPACTS) IS A PROPOSED NASA EARTH VENTURE SUBORBITAL-3 PROGRAM AND IS THE FIRST MISSION WITH A FULL SUITE OF MODERN INSTRUMENTATION TO SPECIFICALLY FOCUS ON DISRUPTIVE EAST COAST US SNOWFALL AND WINTER STORMS. IMPACTS WILL IMPROVE SNOWFALL REMOTE SENSING INTERPRETATION AND MODELING TO SIGNIFICANTLY ADVANCE PREDICTIVE CAPABILITIES. IMPACTS IS A FIVE-YEAR PROGRAM WITH THREE FIELD DEPLOYMENTS IN MID-JANUARY TO THE END OF FEBRUARY (6 WEEKS) IN 2020 2021 2022. THE NASA P-3 AIRCRAFT WILL BE EQUIPPED WITH SEVERAL INSTRUMENTS INCLUDING THE AVAPS DROPSONDE SYSTEM DEVELOPED BY NATIONAL CENTER FOR ATMOSPHERIC RESEARCH EARTH OBSERVING LABORATORY (NCAR EOL). NCAR EOL IS PROPOSING SCIENTIFIC COLLABORATION TO SUPPORT THE PROGRAM WITH THE NRD41 MINI DROPSONDES FOR EACH OF THE THREE FIELD CAMPAIGNS BASED AT NASA WALLOPS FLIGHT FACILITY (WFF) VA IN 2020/2021/2022. THE NCAR EOL AVAPS DROPSONDE TEAM WILL PROVIDE THE REQUIRED NRD41 DROPSONDES FOR THE FIELD CAMPAIGNS TO PROVIDE THERMODYNAMIC AND WIND PROFILE DATA. THE NCAR EOL AVAPS TEAM WILL CONTRIBUTE AS CO-AUTHORS TO IMPACTS PAPERS. IN SUPPORT OF THE THREE IMPACTS FIELD DEPLOYMENT NCAR EOL IS REQUESTING A THREE-YEAR GRANT FOR ITS PARTICIPATION TO PROVIDE NRD41 MINI DROPSONDES.