Hagalaz is the letter H
Anglo-Saxon Rune Poem (from ragweedforge.com)
Hail is the whitest of grain;
it is whirled from the vault of heavenand is tossed about by gusts of windand then it melts into water.
Hagalaz (hail) is the rune of the day. Small hail is somewhat of a wonder, and yet can be beneficial, as it melts and turns into water, which can nourish plants and land. Large hail can be terrible destructive, destroying structures, hurting people, animals, plants and crops, and generally wreaking havoc. Yet, it too melts into water, which can sustain and nourish those that have survived the initial onslaught.
That is the meaning of Hagalaz. Generally considered a unfavorable rune, Hagalaz is the fury and violence of nature. Storms, Lightning, Hail, torrential downpours which lead to flooding and mudslides, but it can also include earthquakes (how appropriate) wildfires (which is different from Arson, but for a surer sign of that expect to see Qweorth as well) and any natural disaster, or seemingly natural disaster. On metaphysical levels, it shows those subtle energies being unsettled and over active, and often acting in destructive ways. Nothing is left the same after Hagalaz, but what does survive is often stronger and more capable.