When seeing shooting stars, a comet, or witnessing a hurricane or lightning say:
בָּרוּךְ אַתָּה יְהוָֹה Blessed are You, Adonoy
אֱלֺהֵֽינוּ מֶֽלֶךְ הָעוֹלָם, our God, King of the Universe,
עוֹשֵׂה מַעֲשֵׂה בְרֵאשִׁית: Who makes the work of Creation.
Upon hearing thunder, say:
בָּרוּךְ אַתָּה יְהוָֹה Blessed are You, Adonoy
אֱלֺהֵֽינוּ מֶֽלֶךְ הָעוֹלָם, our God, King of the Universe,
שֶׁכֹּחוֹ וּגְבוּרָתוֹ מָלֵא עוֹלָם: for His strength and His power fill the universe.
When seeing a rainbow say:
בָּרוּךְ אַתָּה יְהוָֹה Blessed are You, Adonoy
אֱלֺהֵֽינוּ מֶֽלֶךְ הָעוֹלָם, our God, King of the Universe,
זוֹכֵר הַבְּרִית Who remembers the covenant,
וְנֶאֱמָן בִּבְרִיתוֹ is faithful to His covenant
וְקַיָּם בְּמַאֲמָרוֹ: and fulfills His word.
When seeing great seas, or tall mountains which are famous for their great height, say:
בָּרוּךְ אַתָּה יְהוָֹה Blessed are You, Adonoy
אֱלֺהֵֽינוּ מֶֽלֶךְ הָעוֹלָם, our God, King of the Universe,
עוֹשֵׂה מַעֲשֵׂה בְרֵאשִׁית: Who makes the work of Creation.
Upon seeing a place where you had experienced a life-saving miracle, you should say:
בָּרוּךְ אַתָּה יְהוָֹה Blessed are You, Adonoy
אֱלֺהֵֽינוּ מֶֽלֶךְ הָעוֹלָם, our God, King of the Universe,
שֶׁעָֽשָׂה לִּי נֵס בַּמָּקוֹם הַזֶּה: Who performed a miracle for me at this place.
Upon seeing a place where your parents or ancestors were miraculously saved, say:
בָּרוּךְ אַתָּה יְהוָֹה Blessed are You, Adonoy
אֱלֺהֵֽינוּ מֶֽלֶךְ הָעוֹלָם, our God, King of the Universe,
שֶׁעָֽשָׂה נֵס Who performed a miracle
לְאָבִי/לְאִמִּי for my mother/my father
בַּמָּקוֹם הַזֶּה: at this place.