21.   The tropical wave arrived in the vicinity of St. Croix this morning and the doppler weather radar started showing the leading edge progressing westward.

a. + weather >>共 418
bad 16.43%
cold 7.76%
warm 5.15%
dry 4.91%
hot 3.75%
severe 2.57%
good 2.50%
poor 2.39%
wet 2.08%
mild 2.04%
doppler 0.16%
doppler + n. >>共 23
weather 32.81%
shift 12.50%
radar 10.94%
ultrasound 6.25%
reading 4.69%
control 3.13%
flowmetry 3.13%
system 3.13%
fellow 1.56%
laser 1.56%
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