00:00We are chasing supercells that are moving out of central Arizona onto the rim along I-40,
00:06then up in the higher terrain in northern Arizona.
00:08They are invigorating and even developing intense mesocyclones.
00:12We saw a possible tornado earlier near Williams, Arizona, more of a ground scrubber wall cloud.
00:18Cloud bases are very low out here.
00:20Piles of hail are found in the higher elevations.
00:24Temperature is 50 degrees here.
00:26There's a lot of cold air aloft.
00:27The tornado watch continues with relatively high probabilities for tornadoes,
00:31but these are definitely terrain-induced.
00:34As those supercells are moving south to north into the higher terrain of northern Arizona,
00:39those cloud bases are getting on the ground,
00:42and there's a lot of strong low-level wind shear in place.
00:44We have greater than 200, even 300 0-to-1-kilometer storm relative helicity.
00:49That's more than enough low-level wind shear to trigger tornadoes,
00:53and that's why the tornado watch is in effect.
00:55These storms are also prolific hail producers out here in Arizona.
00:59Definitely any storm with a rotating updraft is going to be capable of producing golf ball
01:04and even larger hail out here with so much cold air aloft.
01:08So we are going to continue to track this train of supercells from central Arizona
01:12up into northern Arizona, monitoring for tornado potential and also flash flood potential out here.
01:18There's a slight risk from the Weather Prediction Center today for excessive rainfall
01:22and a moderate risk tomorrow up into southwestern Colorado.
01:26So ahead of this vigorous drop, major convection, tornado potential, flash flooding as well.
