The Prophet ﷺ turned his cloak inside out on Istisqa.  

أَنَّ النَّبِيَّ ﷺ اسْتَسْقَى فَقَلَبَ رِدَاءَهُ  

The Prophet ﷺ never raised his hands for any invocation except for that of Istisqa' and he used to raise them so much that the whiteness of his armpits became visible. (Note: It may be that Anas did not see the Prophet ﷺ raising his hands, but it is narrated that the Prophet ﷺ used to raise his hands for invocations other than Istisqa. See Hadith No. 807 & 808 and also see Hadith No. 612, Vol. 5).  

كَانَ النَّبِيُّ ﷺ لاَ يَرْفَعُ يَدَيْهِ فِي شَىْءٍ مِنْ دُعَائِهِ إِلاَّ فِي الاِسْتِسْقَاءِ وَإِنَّهُ يَرْفَعُ حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ  

Once in the lifetime of the Prophet ﷺ the people were afflicted with drought (famine). While the Prophet ﷺ was delivering the Khutba on a Friday, a Bedouin stood up and said, "O, Messenger of Allah ﷺ! Our possessions are being destroyed and the children are hungry; Please invoke Allah (for rain)". So the Prophet ﷺ raised his hands. At that time there was not a trace of cloud in the sky. By Him in Whose Hands my soul is as soon as he lowered his hands, clouds gathered like mountains, and before he got down from the pulpit, I saw the rain falling on the beard of the Prophet. It rained that day, the next day, the third day, the fourth day till the next Friday. The same Bedouin or another man stood up and said, "O Messenger of Allah ﷺ! The houses have collapsed, our possessions and livestock have been drowned; Please invoke Allah (to protect us)". So the Prophet ﷺ raised both his hands and said, "O Allah! Round about us and not on us". So, in whatever direction he pointed with his hands, the clouds dispersed and cleared away, and Medina's (sky) became clear as a hole in between the clouds. The valley of Qanat remained flooded, for one month, none came from outside but talked about the abundant rain.  

أَصَابَتِ النَّاسَ سَنَةٌ عَلَى عَهْدِ النَّبِيِّ ﷺ فَبَيْنَا النَّبِيُّ ﷺ يَخْطُبُ فِي يَوْمِ جُمُعَةٍ قَامَ أَعْرَابِيٌّ فَقَالَ يَا رَسُولَ اللَّهِ هَلَكَ الْمَالُ وَجَاعَ الْعِيَالُ فَادْعُ اللَّهَ لَنَا فَرَفَعَ يَدَيْهِ وَمَا نَرَى فِي السَّمَاءِ قَزَعَةً فَوَالَّذِي نَفْسِي بِيَدِهِ مَا وَضَعَهَا حَتَّى ثَارَ السَّحَابُ أَمْثَالَ الْجِبَالِ ثُمَّ لَمْ يَنْزِلْ عَنْ مِنْبَرِهِ حَتَّى رَأَيْتُ الْمَطَرَ يَتَحَادَرُ عَلَى لِحْيَتِهِ ﷺ فَمُطِرْنَا يَوْمَنَا ذَلِكَ وَمِنَ الْغَدِ وَبَعْدَ الْغَدِ وَالَّذِي يَلِيهِ حَتَّى الْجُمُعَةِ الأُخْرَى وَقَامَ ذَلِكَ الأَعْرَابِيُّ أَوْ قَالَ غَيْرُهُ فَقَالَ يَا رَسُولَ اللَّهِ تَهَدَّمَ الْبِنَاءُ وَغَرِقَ الْمَالُ فَادْعُ اللَّهَ لَنَا فَرَفَعَ يَدَيْهِ فَقَالَ اللَّهُمَّ حَوَالَيْنَا وَلاَ عَلَيْنَا فَمَا يُشِيرُ بِيَدِهِ إِلَى نَاحِيَةٍ مِنَ السَّحَابِ إِلاَّ انْفَرَجَتْ وَصَارَتِ الْمَدِينَةُ مِثْلَ الْجَوْبَةِ وَسَالَ الْوَادِي قَنَاةُ شَهْرًا وَلَمْ يَجِئْ أَحَدٌ مِنْ نَاحِيَةٍ إِلاَّ حَدَّثَ بِالْجَوْدِ  

ʿAisha said If the Prophet ﷺ saw a cloud In the sky, he would walk to and fro in agitation, go out and come in, and the color of his face would change, and if it rained, he would feel relaxed." So ʿAisha knew that state of his. So the Prophet ﷺ said, I don't know (am afraid), it may be similar to what happened to some people referred to in the Holy Qur'an in the following Verse: -- "Then when they saw it as a dense cloud coming towards their valleys, they said, 'This is a cloud bringing us rain!' Nay, but, it is that (torment) which you were asking to be hastened a wind wherein is severe torment." (46.24)  

كَانَ النَّبِيُّ ﷺ إِذَا رَأَى مَخِيلَةً فِي السَّمَاءِ أَقْبَلَ وَأَدْبَرَ وَدَخَلَ وَخَرَجَ وَتَغَيَّرَ وَجْهُهُ فَإِذَا أَمْطَرَتِ السَّمَاءُ سُرِّيَ عَنْهُ فَعَرَّفَتْهُ عَائِشَةُ ذَلِكَ فَقَالَ النَّبِيُّ ﷺ مَا أَدْرِي لَعَلَّهُ كَمَا قَالَ قَوْمٌ {فَلَمَّا رَأَوْهُ عَارِضًا مُسْتَقْبِلَ أَوْدِيَتِهِمْ} الآيَةَ  

The Prophet ﷺ said, "I was granted victory with As-Saba and the nation of 'Ad was destroyed by Ad- Dabur (westerly wind) .  

أَنَّ النَّبِيَّ ﷺ قَالَ نُصِرْتُ بِالصَّبَا وَأُهْلِكَتْ عَادٌ بِالدَّبُورِ