Chinook

Los Angeles metro area temps ranged from 92 to 117 today. That's near the coast, not the inland empire.

The storm fell apart as it neared Fort Collins, but we got some rain. Loveland got heavy rain and large hail. I videoed the storm as some of the lightning bolts hit near Horsetooth Mountain, or perhaps in the range of 5-15 miles west of town. I got dozens of bolts on video. Here are two:

Looking back at yesterday, should the SPC have given a moderate or high risk for wind damage in the areas that got the derecho(es)? You may think it's a dumb question. I suppose this may be an interestingly bad bust -- some 400-500 (300-400 filtered?) storm reports were in a marginal and/or slight risk yesterday, far away from the moderate risk in the north.

Some more information about record-breaking temperatures yesterday. Plus, we have new wildfires in CO. Pueblo information listed here is from June 27th (Wednesday)

It is kind of interesting that there were two or more disconnected squall line events, that produced such a perfectly connected pattern of wind damage reports. This would probably fit the definition of a (couple of) derecho(es). I suppose the classic definition of derecho is contained in Johns and Hirt (1987) Not that I want to look this up and read this, but the paper citation is: Johns, R. H., and W. D. Hirt, 1987: Derechos: widespread convectively induced windstorms. Wea. Forecasting, 2, 32-49.

June 26 Fort Collins KFNL hit a 97 (36.1C) on the 6-hr sub-hourly maximum, and 96.0 at the local thermometer at Colorado State. KFNL 262356Z AUTO 14007KT 10SM CLR 32/07 A2995 RMK AO2 SLP075 T03220067 10361 20311 56009 June 27 Fort Collins was 93.7 briefly at the Colorado State location, and KFNL airport has hit 100 in the sub-hourly max. (37.8 celsius) KFNL 272356Z AUTO 07011KT 10SM CLR 32/09 A2996 RMK AO2 LTG DSNT SW SLP075 T03220089 10378 20322 55001 June 28 Fort Collins-Loveland Airport (KFNL) had a sub-hourly max of a scorching 104 (40 C) with a dew point around 30. Colorado State had 100.6, CSU - Christman Field had 102.6. I believe this will count as 101 officially at CSU, making it the hottest day since 2012. KFNL 282356Z AUTO 16007KT 9SM CLR 34/04 A2976 RMK AO2 SLP001 T03440039 10400 20344 56014

strong rotational signature and tornadoes reported at the MT/SD border

If a squall line comes in from the northeast, is it a nor'easter? Birmingham area had numerous storm damage reports.

SPC mesoanalysis shows 9500 J/kg of CAPE at North Platte, NE. This may be a record for SPC mesoanalysis.

We've already got 96 degrees at Fort Collins-Loveland Airport! look at this

non-severe thunderstorms at 14z almost exactly overlap yesterday's SPC *moderate* outlook region, which of course has now been downgraded to enhanced risk, farther south.

It's not too often you find the 3000 -4000 J/kg of CAPE at the same areas as 50-60 kt of shear in June. And this almost shows a good overlap of these elements. It seems to be true that multicells/ squall line(s) will be likely tomorrow. It definitely could be more interesting (discussion-wise) to see more discrete supercells. Realistically, we may see quite a few severe storms with 30 - 45 kt of shear, as maybe those 50 kt values will be in the cold air sector.

The sun will never set at 67 degrees north today. The satellite is capable of seeing up to latitude 70 N or 80 N.

Mammatus clouds on Monday, when storms formed into a cluster near I-76

This looks like a high-precip supercell near the CO/KS border

Radar shows a wide, strong rotation near Limon. I'm not sure if this correlates to a large tornado or not. One tornado has been reported near Limon.

another possible tornado near or north of Limon, CO. The SRV-1.5 screen may be better velocity data!

My place just had light rain and, get this -- 1" to 1.5" hail reported about 2 miles away in Fort Collins!! So, I was at the edge of the hail core, and I didn't even hear loud thunder or a respectable rumble.

radar shows 73 dbz on a severe-warned storm near Wellington/north Weld County. I watched the low, dark clouds of this storm from a distance of 5+ miles as it hit Wellington with hail. That's 10 miles north of me.

Weather spotters reported a tornado on this storm, several miles outside of DIA. Meanwhile, I was looking to the sky for a different storm near me.

storm total rainfall from KFTG, and the rain is still going near I-76 at 10:45PM. I got a picture of mammatus clouds to the south. I will post it tomorrow. Hail reports were numerous between Boulder and Brighton.

with sufficient CAPE and shear for supercells, these cells are at least trying to be supercells and dropping 1" hail in a few spots

isolated supercell near the Colorado corner has produced 4 prelim. tornado reports. Unfortunately, this is quite a distance from the CYS and GLD radars.

The weather disturbance associated with Tropical Storm Bud will be moving through the Southwest. There are already a few showers and thunderstorms in AZ and NM right now. This could be fairly helpful for the Southwest, with 1/2" to 1" of rain, Maybe this will help the firefighters contain the 416 Fire near Durango CO. Farther out, there could be some heavier rains in Colorado. People around here are mentioning the smoke cloud from the expanding Badger Creek fire (southwest of Laramie, WY). I saw some of that at sunset last night.

This was the radar image of possibly the largest (?) of yesterday's tornadoes near Omaha. I have not heard of any details of damage.