Monsoon Brings More Rain Chances this Week

Castle Rock Weather Forecast | Castle Rock Co Weather | 80109 Weather

No doubt about it, this is the hottest time of year for most of Eastern Colorado including Castle Rock. Our average high temperature during the day is 86 degrees during this time, as you can see from the forecast above the first half of the week will be slightly to well above average. A stronger cold front moves through lat Tuesday and cools the area down substantially Wednesday, Thursday and a bit on Friday.

The other good news is that due to our high pressure ridge shifting Eastward along with a shift in winds and influx of cooler air, storms with measurable rain look likely during the second half of the week. You can even see evidence of better moisture in the air today as dew points are up across Eastern Colorado.

Current SW U.S. dew points as of 0730 on Monday July 24, 2017

Looking ahead to the middle and later part of the week we can see a further increase of moisture as precipitate water values approach and in some cases surpass an inch. This is basically a measure of the amount of water in the atmosphere, it doesn’t necessarily mean we see an inch of rain. Generally the higher this value is, the more rain we see if all other ingredients come together for storms. For reference it has been around the 0.5 inch range for the past week or so, occasionally jumping to 1 to 1.25 inches.

Precipitable water is a measurement of water in the atmosphere. We like to see higher values if we want to see better chances for rain.

Things To Watch Later This Week


  • Do PWAT values drop, meaning less water for storms to work with?
    • Decreases the amount of rain we see…
  • Does the high shift too far or not enough
    • Could interrupt the transport of moisture into Eastern Colorado meaning less chances for storms or lower storm coverage overall.


  • Chances for storms exist everyday. If out and about, keep a close eye out for dangerous lightning
  • Storms this time of year are heavy and slow moving, flooding concerns will exist for those caught under the heavier storms

We’ll keep a close eye on it and update the forecast as necessary throughout the week. I’m not sold just yet on the 70% + chances for storms starting mid week until we get a bit more data in.

Stay tuned!


John R. Braddock
Storm Chaser/ Amateur Meteorologist at Mountain Wave Weather
John R. Braddock is a NOAA/NWS Certified Storm Chaser and Amateur Meteorologist living in Castle Rock, Colorado. A graduate of Colorado State University with a Bachelor's in Computer Science and a Colorado native, he specializes in short range forecasting, severe weather and mountain weather dynamics.

Leave a Reply

Your email address will not be published.