Weather in Jackson Hole from May 9 to 15, 2022

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JACKSON, Wyo. – An unseasonably cold pattern set in in northwest Wyoming and snow fell on the valley floor. A cool and unstable pattern will prevail over the next few days with additional rounds of snow showers expected. We will finally see a transition to a warmer pattern beginning this weekend and continuing into next week.

Recap May 2-8

Jackson had another cooler-than-average week, which has been a recurring theme since early April. The week started with rain in the valley and snow in the high altitudes, then we saw some nice mid-week breaks.

The choppy weather returned over the weekend with cooler temperatures and heavy snow showers resulting in brief accumulations on the valley floor Monday morning. Jackson’s official reporting station recorded 0.9 inches of new snow Monday.

Tetons weather stations operated by the Bridger-Teton Avalanche Center last reported new snow at 5 a.m. Monday, but a few inches of new snow have likely accumulated above 8,000 feet since then.

Precipitation totals over the past seven days have ranged from 0.7 to 1.3 inches above 9,000 feet in the Tetons and from 0.3 to 0.6 inches below 9,000 feet, including the bottom of the valley. Snow totals over the past seven days have ranged from 6 to 12 inches in the Tetons above 9,000 feet and 1 to 2 inches in the Jackson Hole Valley.

The current snow depth at Jackson Hole Mountain Resort’s Rendezvous Bowl Plot is 90 inches, compared to an average of 99 inches on this date. Snow accumulation at the Rendezvous Bowl Plot and in the Teton Range and Snake River Basin as a whole is about 90% of the average for the date.

The hottest temperature over the past week in Jackson was 64ºF on Thursday May 5th and the coldest temperature was 26ºF also on Thursday May 5th. Although there were no notable temperature extremes last week, temperatures were below average on five of the seven days.

Forecast from Monday (5/9) to Sunday (5/15)

A deep trough of low pressure is located over the western United States on Monday, which opened the door to the arrival of unusually cold air from the northwest. Daytime temperatures on Monday are about 20 to 25 degrees lower than average for this time of year.

A powerful disturbance moving in from the southwest brought heavy snow showers to the Tetons and Jackson Hole Monday morning. For the rest of Monday and into early Monday evening, additional flurries can be expected at times, but flurries will be more scattered and less widespread than earlier.

Most of the snow that accumulated in Jackson on Monday morning has already melted, as would be expected at the end of the year, and no further accumulation is expected on the valley floor. However, road conditions above Teton Pass could become slushy at times under heavier snow showers.

Conditions will dry out later Monday night and Tuesday, but scattered clouds and gusty winds can still be expected. Tuesday’s highs will warm to the low 50s in the valley, which is still cooler than average but warmer than Monday.

Highs will warm into the upper 50s on Wednesday under a mix of sun and cloud as winds remain strong.

A disturbance passing to our south will swing across central Wyoming Wednesday night with overnight showers and thunderstorms expected east of the Continental Divide, but this activity will initially miss Jackson Hole.

Later Wednesday night and Thursday morning, some moisture could wrap around this feature and work its way into the Tetons from the northwest, bringing a risk of flurries early Thursday through about noon Thursday. However, this is a marginal configuration for our region, so there is no guarantee that we will see anything.

A stronger disturbance will arrive from the west/northwest Thursday evening and Friday with showers developing throughout the region.

A cold front arriving with this feature will usher in another unusually cool air mass, and snow levels are likely to fall to the valley floor accordingly and brief accumulations in the valley could not be ruled out Friday morning.

We will finally start to break out of this cool and unstable pattern over the weekend. Saturday looks dry at this point with a mix of sun and cloud and highs warming into the upper 50s after a cold start.

On Sunday, more warming is likely with increasing sunshine and highs currently expected to peak in the upper 60s in the valley.

Extended Outlook

Next week promises to be much warmer with more seasonal to above average temperatures expected for most of the week. We will likely see more sunshine compared to the past few weeks, but we could still see occasional disturbances bringing showers to the region.

Snow levels will also be higher next week when precipitation occurs, with rain becoming the dominant precipitation type at least at mid-altitude Tetons.

Alan Smith, Meteorologist

To note: I will be traveling next week and will not be posting a weekly forecast on Monday May 16th or Monday May 23rd. I will be posting a forecast for Memorial Day weekend on Thursday, May 26, followed by weekly weather forecasts on Tuesday, May 31.

Climatology of the City of Jackson May 9-15

Medium top: 63

Medium Low: 31

High record: 83 (May 15, 1934)

Record low: 12 (9 May 2021)

Record 24-hour rainfall: 1.01″ (May 10, 1966)

Log snow over 24 hours: 4.0″ (May 13, 2004)

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