Boulder, Colorado Weather: 6/20/18

Yesterday, there was a beautiful supercell northeast of Denver.  I watched it from my car as I circled around the airport to pick up a few folks for the SSP.  I did not get to chase it, or to take photos of it, unfortunately.

This morning has been mostly sunny, mild and still.

The NWS in Boulder, CO, forecasts a mostly sunny day, with a 10% chance of isolated showers and thunderstorms, and a high temperature of 74 F.  The winds will be from the northeast at 5-8 mph.  This evening will be partly cloudy, with a 10% chance of isolated showers and thunderstorms, and a low temperature of 53 F.  The winds will be from the north northeast at 5-8 mph, becoming light and variable by midnight.

The NWS in Boulder, CO, has issued a Hazardous Weather Outlook concerning isolated, sub-severe storms this evening.

The visible satellite image shows only a few lingering clouds over the mountains this morning.

The 12Z upper air sounding from Boulder shows a humid column below 500 mb.  There was 0.75 inches of precipitable water present in the column.  There was 63 J/kg of Convective Available Potential Energy (CAPE) and -104 J/kg of Convective Inhibition (CINH).  The Lifted Condensation Level (LCL) was 76 m.  There was no thermal inversion near the surface, and the 0-3 km average lapse rate was 5.9 C/km.

The hodograph shows that there was 2 kts low-level shear (due mostly to directional changes) and 54 kts deep-layer shear (due mostly to speed changes).

The surface observations (from the SPC Mesoscale Analysis Map) show cool temperatures and moderate humidity, based on the dewpoints.  The skies are clear over the state today.  The winds are light, statewide.

The surface pressure chart shows no strong pressure systems or gradients over the state this morning.  The RAP shows that thermal low pressure is expected to develop over the eastern slopes of the Rocky Mountains just north of the CO/NM border, in the next six hours.  No strong pressure gradients are expected with this thermal low.

The NAM 250 mb chart shows a slight ridge over Colorado this afternoon, with a moderate jetstreak passing through the northeastern corner of the state by 00 Z.

The HRRR simulated reflectivity shows a few scattered storms, particularly in the northeastern corner of the state.

The HRRR predicts that the high temperatures for Boulder will peak in the low-70’s by 22 Z.

The HRRR shows that the winds will not be very strong. This chart has been excluded from today’s post.

The HRRR shows cloud coverage is expected to be light, and primarily east of I-25.

Today looks to be an absolutely pleasant day.  This is good, as I have quite a few things on my list today, and walking to the CU Boulder campus will be one of the more pleasant tasks.

Thank you for reading my post.

Sources:
The forecasts from the National Weather Service are from The NWS Homepage
The upper air soundings and mesoscale analysis plots are from the Storm Prediction Center website.
The satellite data, model data, and forecasted soundings are from College of DuPage – SATRAD

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About highplainschasing

This blog is about my tales in storm chasing. My name is Seth Price and I am an instrumentation instructor at New Mexico Tech. My amateur radio call sign is N3MRA.
This entry was posted in Follow Up, Local WX, Practicing Concepts, Predictions, Satellite Imagery and tagged , , , , , , , , . Bookmark the permalink.

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