51.   The NATO assault in Kosovo heightens the risk to allied pilots, the day after an American Stealth fighter-bomber went down near the Yugoslav capital of Belgrade.

52.   The resulting warm-up will heighten the risk of thunderstorms.

53.   The third is a slow-moving low pressure system, whose sluggishness heightens the risk of protracted rain.

54.   They also fell amid worries a slumping stock market will heighten the risk of loan defaults and bad debts.

55.   This evaporating power, in combination with a lack of rain, has created tinder-dry conditions, heightening the risk of wild fires.

56.   They should stay connected to their social networks because isolation heightens the risk for anxiety and depression.

57.   Thus, recurrent heavy rains will heighten the risk of flooding.

58.   To be sure, some investors said they expect yields to keep climbing this year as the economy strengthens, heightening the risk that inflation will accelerate.

59.   To be sure, some investors said they still expect yields to keep climbing this year as the economy strengthens, heightening the risk that inflation will accelerate.

60.   Tuesday, the combination of very humid air being vigorously lifted by the jet stream disturbance will heighten the risk of severe storms.