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As one of the important means of tornado monitoring and early warning, weather radar uses Xband dual polarization phased array weather radar system with ultra-high space-time resolution to better capture tornadoes and facilitate tornado early warning. This work chooses a tornado that occurred in Nanhai, Foshan at 07:00 on June 19, 2022 to analyze the genesis and lysis of the tornado and the process of radar monitoring and early warning. With radar intelligent early warning software, the sensitive dual polarization and ultra-high space-time resolution data from X-band dual polarization phased array weather radar, real-time inversion of the three-dimensional wind field and analysis of tornado debris (TVS) characteristics can significantly enhance tornado monitoring and early warning. The tornado was successfully warned 18 minutes in advance in this case, which suggests that X-band dual polarization phased array weather radar is highly capable of strong convective weather detection. [ABSTRACT FROM AUTHOR]

Objective To assess the efficacy of balloon catheter -assisted sclerotherapy with direct injection into the great saphenous varicosity. Methods 110 patients with lower limb varicosity were treated with direct injection of foam sclerosant into the great saphenous varicose veins through a balloon catheter to prevent backflow of the foam sclerosant. The contralateral femoral vein was punctured and a balloon catheter was introduced to the great saphenous vein of the affected side. After blocking the blood flow by inflating the balloon, the foam sclerosant was injected to the great saphenous vein guided by digital subtraction angiography. The symptoms, signs and complication were recorded on the 2nd day followed by color Doppler US on the 3rd day. The patients were followed up clinically at 2 weeks, 3 months, 6 months, and 1 year. Results The average volume of foam sclerosant injected in each limb was 32.4 mL equivalent to 8.2 mL of polidocanol liquid. The symptoms including lower limb pain, fatigue, and varicosity after prolonged standing were alleviated on the day after the treatment. Follow-up color Doppler US showed occlusion of the trunk and branches of the great saphenous varicose veins without blood flow in all patients. Eczema in the lower limbs of 8 patients resolved after 2 weeks. Three patients with intractable ulcers were healed after 6 months. Complications included phlebitis (11)， subcutaneous sclerosis and pigmentation (9). No deep vein thrombosis or pulmonary embolism was observed. There was no recurrence of varicose at 1 year follow-up. Conclusion The new approach using direct injection of foam sclerosant into the great saphenous varicosity through a balloon catheter has higher occlusion rate of the great saphenous vein trunk and branches with marked symptom relief and few adverse reactions. [ABSTRACT FROM AUTHOR]