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Weekly Weather Update – June 29, 2020

JACKSON, Wyo. — An unseasonably cold and wet system has been impacting Jackson Hole and the Northern Rockies over the past couple of days, resulting in well below average temperatures along with impressive rainfall amounts for this time of year.

While the early summer cold snap might be a bummer for outdoor activities, the beneficial rain is coming at a good time. June is about to come to an end and July and August are the two driest months of the year on average in Jackson. Not coincidentally, these two months are also the peak wildfire months in Western Wyoming. Anytime we can pick up beneficial rainfall at this time of the year, it is a good thing.

As of Monday morning, the Jackson Hole valley has picked up between three-quarters of an inch and an inch of rain and the mountains have picked up between an inch and an inch and a half of rain.

Here are some of the rainfall totals over the past 48 hours in the Jackson Hole Region:

  • Phillips Bench – 1.40 inches
  • Togwotee Pass – 1.30 inches
  • Grand Targhee – 1.10 inches
  • Hoback – 1.03 inches
  • Driggs – 1.00 inches
  • Teton Village – 0.97 inches
  • Alpine – 0.97 inches
  • Jackson Hole Airport – 0.90 inches
  • Moose – 0.86 inches
  • Jackson – 0.74 inches

The map below shows rain and precipitation totals that have fallen across the Northern Rockies and the Northwest U.S. over the past 72 hours:

With the cold air in place, snow has been falling across the higher elevations as well. Snow levels fell as low as 8,400 feet on Monday morning, which included Teton Pass. This goes to show that snow can fall at any time of the year in the mountains!

Weekly Weather Outlook – June 29 – July 5

The first half of this week will feature continued wet weather and colder than average temperatures, especially on Monday and Tuesday. Fortunately, the weather will improve significantly heading into the Fourth of July weekend with a return to seasonal temperatures.

Monday:

A cold trough of low pressure remains over the area, which will result in thick overcast skies, off-and-on light rain showers and temperatures 25-30 degrees BELOW average. Shower activity should taper off by late in the day and into the evening.

Tuesday:

A secondary area of low pressure will approach, leading to another cool and wet day with rain showers picking back up in the morning and becoming widespread into the afternoon.

Wednesday:

We’ll start to see subtle improvements with highs warming up into the 60s along with some peeks of sunshine unlike the prior two days. However, enough moisture remains for isolated morning showers, giving way to more numerous afternoon showers and thunderstorms.

Thursday-Friday:

We will finally break out of the cold and wet pattern with increased sunshine and temperatures warming up into the mid to upper 70s. There will still be enough lingering moisture for isolated afternoon/evening thunderstorms to develop, but overall it will be much drier compared to prior days.

Fourth of July Weekend:

Overall, it’s looking like a nice holiday weekend with highs near 80 on Saturday and Sunday, which is right around average for this time of year. The forecast is not totally dry as there will be a chance of afternoon/evening thunderstorms both days, but significant rainfall is not expected.

Alan Smith, Meteorologist

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