Under the best of circumstances, spotters in the field should be able to avoid severe rain, hail, and other hazzardous road conditions. However, the reality of storm intercept almost certainly will require spotters and chasers to operate under less than ideal road conditions. Hydroplaning is a major area of concern, and if there is any doubt about the situation, the first response should be to slow down and exercise good judgment. Water on the roads deep enough to cause hydroplaning may not be obviously visible, so caution must be exercised on any wet roads. In fact, loss of control of the vehicle on wet roads is possible even when hydroplaning is not involved, if the vehicle is moving too fast for the conditions.
When it is raining, driving conditions can, and do change suddenly so spotter vehicles need to be alert to the possibility of changing road conditions at all times. Generally, unpaved roads are not recommended after they have been rained upon; many become extremely slick well before they become impassable due to mud. You must judge whether you have time to get back to a paved road before it starts raining. Many roads in Oklahoma (and elsewhere) do not have good shoulders to forgive any problems that might arise and often a deep, muddy bar ditch awaits any careless maneuver.
In some cases, Net Control can provide guidance on the quality of unpaved roads; remember though that information from Net Control is sometimes the "opinion" of the controller and no one but you as a spotter are liable for problems you may encounter while spotting or chasing.