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The HAWC Gamma Ray observatory consists of 300 water Cherenkov detectors(WCD) instrumented with four photo multipliers tubes (PMT) per WCD. HAWC islocated between two of the highest mountains in Mexico. The high altitude (4100m asl), the relatively short distance to the Gulf of Mexico (~100 km), thelarge detecting area (22 000 m$^2$) and its high sensitivity, make HAWC a goodinstrument to explore the acceleration of particles due to the electric fieldsexisting inside storm clouds. In particular, the scaler system of HAWC recordsthe output of each one of the 1200 PMTs as well as the 2, 3, and 4-foldmultiplicities (logic AND in a time window of 30 ns) of each WCD with asampling rate of 40 Hz. Using the scaler data, we have identified 20enhancements of the observed rate during periods when storm clouds were overHAWC but without cloud-earth discharges. These enhancements can be produced byelectrons with energy of tens of MeV, accelerated by the electric fields oftens of kV/m measured at the site during the storm periods. In this work, wepresent the recorded data, the method of analysis and our preliminaryconclusions on the electron acceleration by the electric fields inside theclouds.

HAWC response to atmospheric electricity activity