But you would also have to say "due to hydrometeorological factors" or something of the sort, because otherwise it would include eartquakes, volcanic eruptions etc., which are not "hydrometeorological", it seems to me.
And I must agree that "Hydrometeorological Acts of God" would seem odd, even though "God moves in a mysterious way his wonders to perform".

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Bad weather is a "stikhiynoye yavleniye", many countries have Bad weather alerts for motorists and residents, with specific alerts for flooding, rainstorms, snowstorms, tornadoes, gales (very strong winds), hail, you name it.

Atmospheric phenomenon (phenomena) As commonly used in weather observing practice, an observable occurrence of particular physical significance within the atmosphere. From the viewpoint of weather observations, the atmospheric phenomena include all hydrometeors (precipitation types and fogs), blowing snow, thunderstorms, tornadoes, waterspouts, and others.

http://nsidc.org/arcticmet/glossary/atmospheric_phenomenon.h...

atmospheric phenomenon—As commonly used in weather observing practice, an observable occurrence of particular physical (as opposed to dynamic or synoptic) significance within the atmosphere.
Included are all hydrometeors (except clouds, which are usually considered separately), lithometeors, igneous meteors, and luminous meteors. From the viewpoint of weather observations, thunderstorms, tornadoes, waterspouts, and squalls are also included. The above usage excludes such “phenomena” as the local or large-scale characteristics of wind, pressure, and temperature; it also excludes clouds, although it includes many products of cloud development and composition. In aviation weather observation, atmospheric phenomena are divided into two categories: weather and obstructions to vision.

http://amsglossary.allenpress.com/glossary/search?id=atmosph...

Марк, полагаю, что здесь случайное совпадение и автор имел в виду именно это (крайне неудачное фигуральное употребление слова "стихийный" в метеорологическом контексте)

Alert on possible occurences of "unpredictable meteorological events". Набрав это на Гугле, вы увидите, что все употребимо - например, в отношении изменения направления ветра. Просто сложно выцарапывать четкие предложения для ссылки, со своим погибаю, отвлекаюсь вот, чтобы встряхнуться... А то у меня такая тоска-тощища, поубывав бы авторов.

I would try to incorporate 'elements' here.

Also 'стихийные явления' are not necessarily 'natural disasters'.

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Note added at 5 hrs (2007-11-15 03:51:14 GMT)
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Well, Mark, just as you said: 'elemental phenomena' - i believe it includes 'hydrometeo' nicely, also 'elemental' covers 'стихийные'.

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Note added at 8 hrs (2007-11-15 07:19:10 GMT)
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Warning of dangerous (hazardous) weather phenomena