Under the Song, during the Xuanhe era (1119-25), when someone arose from their bed in front of a tea shop and wiped down the couch, they noticed something crouching beside them like a dog; looking again in the bright light of dawn, it turned out to be a dragon. The person cried out loudly and fell to the ground. A short distance from the tea shop stood a workshop for military equipment. A group of soldiers from the workshop took away the dragon and ate it, but didn’t dare to report the matter. People in the capital all drew pictures to transmit and appreciate the sight; its body was only six or seven chi in length (about 2m), as  they have been painted for generations: the dragon’s scales being grey-black, its head like that of a donkey, its cheeks like those of a fish, the colour of its head a true green, with a horned brow, a very long back, splitting into two segments at the end; its voice was like that of a cow. A night later, at the fifth watch (about 4am), a red cloud came from the northwest and covered dozens of circuits, reaching towards heaven, crossing into the Purple Palace and the Great Bear; looking up, the stars all seemed to be separated by red gauze. When the sun rose it split with a tearing noise, which later became very great. This happened over several following evenings, the noise growing, its shaking lasting a long time and becoming extremely strong, with red clouds spreading from the northwest for tens of thousands of circuits, two clouds of black and white passing from the northwest to the northeast, the noise continuing without end, finally stopping at dawn. Several days later, water flooded into the capital, rising to more than ten zhang (33m). Diviners said that in bingwu the omens matched those of the fall of the Northern Qi (550-77), and later the nature of this matter became extremely clear.
Anon., Huhai xinwen yijian xuzhi, 前2.73-74 (Tale 129):
宋宣和間，開封縣前茶肆人晨起拭牀榻，睹若有大犬蹲其旁，質明視之，龍也。其人驚呼仆地。茶肆適與軍器作坊近，為作坊兵衆取而食之，不敢以聞。都人皆圖畫傳玩，身僅六七尺，若  世所繪，龍鱗蒼黑，驢首而兩頰如魚，頭色正綠，頂有角，坐極長，其際始分兩䏢，有聲如牛。越一夕五鼓，西北有赤氣數十道近天，犯紫宮北斗，仰視星皆若隔絳紗。方起時折裂一聲，然後大發。後數夕又作，聲益大，震且久，其發尤甚，而赤氣自西北數十萬道，中有黑白二氣自西北而由東北，其聲不絕，迨曉乃止。後數日，水犯都城，高十餘丈。占者謂丙午及北齊末占同，後事驗亦甚明也。
Yuan Haowen 元好問, Chang Zhenguo 常振國 (ed), Xu Yijian zhi 續夷堅志 (Continued Records of the Listener), and Anon., Jin Xin 金心 (ed.), Huhai xinwen yijian xuzhi 湖海新聞夷堅續志 (Continuation of Records of the Listener with New Items from the Lakes and Seas) (Beijing: Zhonghua shuju, 1986).
An account of the same events is found in Anon., Xuanhe yishi 宣和遺事 [Neglected Events of the Proclaiming Harmony Regnal Period]. Dating it to the second year Xuanhe (1120), this places the incident within a series of disastrous portents, their meaning relating to the palace. The Xuanhe yishi version also, disappointingly, omits the discussion of painting traditions.
William O. Hennessey (tr.), Proclaiming Harmony, Michigan Papers in Chinese Studies, 41 (Ann Arbor, MI, Center for Chinese Studies, University of Michigan, 1991), pp. 41-42:
That summer, in the fifth month, a creature somewhat like a dragon appeared in front of a teashop in Kaifeng County. It was about six or seven feet long with blue black scales. It had a head like a donkey, but with fish-cheeks and a horn on top of its skull. It bellowed like an ox. As it happened, the shopkeeper was making up the beds that morning when he noticed something the size of a large dog beside him. When he looked closely, it was this dragon. He was so surprised he keeled over in fright. The teashop was situated very close to an arms manufactory, and when the workers in the mill found out about the dragon they killed and ate it.
That night in the fifth watch, several score columns of crimson vapor rose to the sky in the northwest. When one looked up at the North Star, it was as if it were veiled in scarlet gauze. In the midst of it all were alternate streams of black and white vapor, from which emanated crackling sounds like thunder from time to time. Soon rain began to fall in torrents. The level of the river rose more than ten yards, seeping through the city walls and breaking down the dike on the Bian River. Although all the laborers available within the city were marshalled to help in the crisis, carrying straw and sandbags to stem the tide, they were unable to hold it back. Finally, Huizong called upon the executive of the Ministry of Revenue, Tang Lu, to take charge of the operations. In the morning, Lu went out on the river in a small dinghy to see what the flood was like so that it might be controlled. The emperor watched him from atop, a tower. When he  discovered it was Lu himself out on the waters, he wept. Several days later the waters leveled off and Lu went to see the emperor, who praised him highly. ‘The temples of Our ancestors are secure, thanks to your work,’ he said.
Lu responded, ‘Water is an element of the Yin class. Yin influences are ascendant and pervade even to the inner reaches of the city and palace. I pray Your Majesty will communicate directly with his ministers, sequester himself from feminine wiles and small-minded people, and heed well this warning from Heaven to make ready for the tribes.’ Huizong commended this memorial and accepted it.
Anon., Xinkan dasong xuanhe yishi 新刊大宋宣和遺事 (Neglected Events of the Proclaiming Harmony Regnal Period of the Great Song: A New Edition) (Shanghai: Gudian wenxue chubanshe, 1954), pp. 29-30:
夏，五月，有物若龍，長六七尺，蒼鱗黑色，驢首，兩頰如魚，頭色綠，頂有角，其聲如牛，見於開封縣茶肆前。時茶肆人早起拂拭床榻，見有物若大犬蹲其傍，熟視之，乃是龍也。其人吃驚，臥倒在地。茶肆與軍器作坊相近，遂被作坊軍人得知，殺龍而食之。是夕五鼓，西北有赤氣數十道衝天，仰視北斗星若隔絳紗，其中有間以白黑二炁，及時有折烈聲震如雷。未幾，霪雨大作，水高十餘丈，犯都城，已破汴堤，諸內侍役夫，擔草運土障之，不能禦。徽宗詔戶部侍郎唐恪治之。即日，恪乘小舟覽水之勢，而求所以導之。上登樓遙見，問之，乃恪也，為之出涕。數日，水平，恪入對，上勞之曰：「宗廟社稷獲安，卿之功也！」唐恪因回奏：「水乃陰類。陰炁之盛，以致犯城闕。願陛下垂意於馭臣，遠女寵，去小人，備夷狄，以益謹天戒。」徽  宗嘉納之。