Josh Larson

Josh Larson worked at the Climate Prediction Center as a climate analyst and at the NWS in Maryland. He wrote for, and co-produced the WP’s Capital Weather Gang from 2003 to 2010. @coloradowx.
Denver Forecast
Snow Back in the Forecast by Wednesday
While folks across the Front Range are still digging out from this past weekend's significant snowfall , the Weather5280 team already has its eyes on the next snow-producing system scheduled to impact our region late Wednesday into Friday. While this weekend's storm setup involved a upper-level area of low pressure to our west combined with upslope, the coming system more or less lacks the first piece. This will be primarily an
Major Warming Trend to Unfold
Yesterday's snow event performed close to how Weather5280 expected it to. Most spots in the immediate Denver metro area reported 2-4", with higher amounts to the south and southwest of Denver (as we had indicated in our forecast) and towards the Foothills. Denver International Airport (DIA) recorded exactly 3" of snow, with just 0.12" of precipitation -- which works out to a high 25:1 liquid to snow ratio. This may be the last snowfall for Denver metro, however, for the next 7-10 days, as the
Denver Forecast
Chilly and Unsettled Through Tuesday
The first in a series of relatively weak cold fronts pushed through the Denver metro area late Sunday afternoon , bringing with it scattered showers of rain and wet snow. There is neither a lot of cold air nor a lot of moisture to work with, so the most we expect is a coating to an inch (but probably closer to the former rather than the latter) of wet snow to accumulate across parts of the Denver metro area tonight -- with higher snowfall totals possible acros
State of the Atmosphere
State of the Atmosphere for Sunday, January 4, 2015
Well, we've certainly gotten off to an active start weather-wise for the first few days of 2015! What with the active last 7-10 days of December, we've had busy few weeks of weather across the Front Range. With this post I'd like to do a little wrap-up regarding the weather we've experienced over the past few weeks, as well as December as a whole, and also update you on how things look in terms of weather impacts for Denver for this coming week and the following one. A look back at December Th
State of the Atmosphere
The State of the [Arctic] Atmosphere: Sunday, November 9, 2014
You’d most likely have to have been living under a rock for the past few days if you’re unaware of the MAJOR change of weather we’re about to experience in the next 24 hours. Indeed, Brendan laid the groundwork for the pattern change this past Tuesday on the blog . Not much has changed in the overall big picture he painted for us then, though we obviously have
State of the Atmosphere
The State of the Atmosphere: Monday, October 20th, 2014
Recap of month so far If it feels like we have had a lot of warm days so far in October, you’re not mistaken: Denver is now a not-insignificant +2.2℉ above normal for temperatures month-to-date. In fact, the last 7 consecutive days (including today) have featured well above-normal temperatures, and over this one-week period, we’re actually averaging a sizable 7.7℉ above normal. What has caused this prolonged stretch of above normal temperatures? Quite simply, we’re in an amplified -- or “blocky
Denver Forecast
Update on Fast-Approaching Cold Front
It’s nice to look back on a forecast we put out Sunday, and note that 72 hours later little has changed in our thinking regarding our upcoming sharp, albeit short-lived, cold shot. Forecast confidence has gone up now that the GFS has finally (multiple days later) come into good alignment with the ECMWF and GEM models that were the basis of the ideas we put out in Sunday’s “State of the Atmosphere.” What we do have now, however, is
State of the Atmosphere
The State of the Atmosphere: Sunday, September 7, 2014
Warm Start to the Week; (Near-) Record Cold Finish? While all eyes are on the late-week cold shot that Weather5280 team members have been discussing (primarily on Twitter) for the better part of the last week, let’s take a look at the more benign weather expected to start off the week before tackling the late-week cold. Monday offers us a blend of clouds and sun with a slight chance of scattered late day thunderstorms, though I think most areas will remain dry. High temperatures will be near- o
State of the Atmosphere
The State of the Atmosphere: Sunday, August 17, 2014
Looking back at the first half of August, 2014 Now that more than half of the month of August has passed, it is prudent to take a look back on the conditions we experienced during the first half of the month in order to see how the month is shaping up overall and to inform our forecast for the remainder of the month. On August 2, our average high started falling once again (from 90 to 89), and on August 9 our average overnight l
Severe Weather
Hot with Scattered Storms Today; Cooler Tomorrow
Unless you were stuck inside the whole holiday weekend, which we truly hope was not the case, you'd know we had a very hot 4th of July weekend. Denver (DIA) hit 93 on the 4th, 96 on Saturday, and a sultry 98 on Sunday. While these temperatures were 5-10 degrees warmer than 'normal' for the date, they were also well shy of the records for those days (which ranged from 101-103). The week ahead may feel fairly similar to the week we just ended, though with a better chance of afternoon and evening
State of the Atmosphere
The State of the Atmosphere: Sunday, June 29, 2014
A look back at June Denver has seen very typical June temperatures this month (as of press time, we're running -0.2 degrees below 'normal') with 92% of normal precipitation at Denver International Airport. Because of the scattered nature of convection this month, most areas in the Denver metro area have seen near -- or in some cases, above normal precipitation. As a result, wildfire risk overall is substantially lower than last June statewide. Why? This time last year 100% of the state was se
State of the Atmosphere
The State of the Atmosphere: Sunday, February 16, 2014
Half of February in the Books; Where Do We Go from Here? Feb 2014 Temp AnomaliesWith more than half of this shorter-than-normal month already down, it is prudent to look back on the conditions we've experienced over the past approximately two weeks, as well as look forward to what may be in store for us for the rest of the month. Looking at temperature anomalies through the 14th of the month, we see that nearly two-thirds of the nation has experienced well below-normal temperatures, with the
Snowfall Forecast
Snow on Track for Tonight, Early Thursday
Though we hit 63 degrees Tuesday afternoon in Denver, significant weather changes are in store for us today. A sharp cold front will push through the region this afternoon, with light snow developing by mid-to-late evening. Temperatures are in the low-to-mid 20s this morning across much of the area. Some partial sunshine will probably allow temperatures to rise to the lower 40s by around noon before our cold front pushes through in the early afternoon. Temperatures will fall for the remainder o
Snowfall Totals
The State of the Atmosphere for Sunday, January 5, 2014
The Front Range has certainly gotten a taste of winter once again over the past couple days. Many areas saw 3 to 6" of snow (with some spots, especially around Boulder, seeing up to 9") on Saturday along with temperatures that were some 40 degrees colder than Friday. Very cold temperatures and scattered snow showers on Sunday did not do anything to dispel the wintry feel; in fact, it only made it up to 12°F for a high at DIA. Of course, as we've indicated much of this week at Weather5280, the A