Boulder, Colorado Weather: 7/12/18

Yesterday was hot and sunny.  A few clouds drifted in the late evening, but the participants of the Summer Science Program could still make observations.

This morning has been sunny, warm and still.

The NWS in Boulder, CO, forecasts increasing clouds, with a 30% chance of scattered showers and thunderstorms, and a high temperature of 93 F.  The winds will be from the northeast at 6-9 mph.  This evening will be mostly cloudy, with a 20% chance of isolated showers and thunderstorms, and a low temperature of 61 F.  The winds will be from the west northwest at 5-9 mph, becoming light and west after midnight.

The NWS in Boulder, CO, has issued a Hazardous Weather Outlook concerning scattered showers and thunderstorms in the area.  The primary threat will be heavy downpours.

The visible satellite image shows some clouds over the western half of the state today, but very few over the Denver Metro area.

The 12 Z upper air sounding from Boulder shows a nearly saturated layer at 450 mb.  There was 0.99 inches of precipitable water present in the column.  There was 2 J/kg of Convective Available Potential Energy (CAPE) and -400 J/kg of Convective Inhibition (CINH).  The Lifted Condensation Level (LCL) was 1158 m.  There was no thermal inversion near the surface, and the 0-3 km average lapse rate was 6.1 C/km.

The hodograph shows that there was 4 kts low-level shear (due mostly to directional changes) and 10 kts deep-layer shear (due mostly to speed changes).

The surface observations (from the SPC Mesoscale Analysis Map) show mild temperatures and moderate humidity, based on the dewpoints.   The skies are clear, and the winds are generally southerly, statewide.

The surface pressure chart shows that there are no strong pressure systems or gradients over the state this morning.   The RAP shows that the pressure will drop with diurnal heating, but no strong pressure gradients are expected over Colorado.

The NAM 250 mb chart shows weak, northerly flow over the state today.

The HRRR simulated reflectivity shows scattered storms firing around 21 Z and continuing into the evening.  The Denver metro area will be affected by these storms off and on throughout the late afternoon and early evening.

The HRRR predicts that the high temperatures for Boulder will peak in the upper 80’s by 23 Z.

The HRRR dewpoints will hit their peak in the mid 50’s.

The HRRR shows that the winds in the Denver area will remain light.  This image has been excluded from today’s post.

The NAM shows skies partly cloudy during our observation window, clearing out towards the end.

The HRRR shows significantly less cloud cover through the observation window.

Today will be a warm, but clouds will begin to form in the early afternoon.  Showers and thunderstorms are possible, but in the low shear environment, they are expected to remain below severe limits.  The left-over anvil material may block the early shift’s observation’s, but I bet middle and late shift run for sure.

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 Local WX, Practicing Concepts, Predictions, Satellite Imagery and tagged , , , , , , , . Bookmark the permalink.

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