June 6-7 - Heavy Rain, Snow, & Gusty Wind Hit Western and Central Wyoming

A low pressure system that was over Fremont County on Wednesday afternoon moved into the Dakotas by Thursday morning.  This low has wrapped around moist, northerly flow across much of western and central Wyoming.  Strong thunderstorms on Wednesday afternoon produced heavy rainfall and hail ahead of the low pressure system and associated cold front, especially in the Wind River Basin.  The northerly flow was creating upslope conditions early Thursday on the north side of both the Owl Creek and Wind River Mountains enhancing precipitation in these areas.  Rainfall reports are listed in Table 1 below.

And, yes, snow did fall in the mountains as temperatures plummeted behind the cold front.  Snow levels dropped to around 6,500 to 7,000 feet by early morning Thursday.  The Bighorn Mountains north of Powder River Pass received around one foot of snow, while amounts at the south end of the range were generally from two to six inches.  The higher terrain of the Absarokas also received a nice snowfall from this event.  A comprehensive list of snowfall amounts is provided below in Table 2.

In addition to the heavy precipitation, gusty north and northwest wind increased significantly beginning early Thursday morning.  A tight pressure gradient in association with the low pressure system was the culprit causing the gusty wind.  Locations around Buffalo and Greybull are quite prone to wind from the northwest and this event has been no different.  Wind gusts at the Buffalo Airport were greater than hurricane force around 6:00 a.m. Thursday with a peak gust of 77 mph at 6:10 a.m.  Greybull reported a peak wind gust of 62 mph at 6:43 a.m. Thursday.  A more detailed list of peak wind gusts is provided in Table 3 below.

Updated and additional rainfall, snowfall, and wind reports will be added throughout the day on Thursday.

Table 1.
24-hour Precipitation (inches) Reports as of
around 12:00 p.m. Thursday, June 7, 2007

CountyGeneral Station NameRainfall
Big Horn Lovell 2 South-Southwest 0.82
Big Horn Hyatt High 0.66
Big Horn Shell 0.36
Big Horn Greybull Airport 0.33
Big Horn Mill Creek 0.07
Fremont Togwotee Pass SNOTEL 1.40
Fremont Riverton 30 North 0.96
Fremont Riverton 0.71-0.91
Fremont Riverton Airport 0.89
Fremont Riverton 1 Northwest 0.79
Fremont Lander Airport 0.63
Fremont Hudson 0.62
Fremont Riverton 3 Southeast 0.55
Fremont Arapahoe 0.53
Fremont Lander 0.35-0.42
Fremont Jeffrey City 0.25
Fremont Boysen Dam 0.21
Fremont Elkhorn 0.19
Fremont Dubois 0.18
Fremont Lander 11 South-Southeast 0.18
Fremont Dubois 10 Northwest 0.15
Fremont Camp Creek 0.04
Hot Springs Thermopolis 15 East 1.51
Hot Springs Thermopolis 9 Northeast 1.36
Hot Springs Grass Creek Divide SNOTEL 0.90
Hot Springs Thermopolis 0.85
Johnson Buffalo Airport 1.95
Johnson Buffalo 4 South-Southwest 1.85
Johnson Buffalo 7 Northeast 1.74
Johnson Kaycee 17 Northwest 1.45
Johnson Cloud Peak Reservoir SNOTEL 1.40
Johnson Buffalo 1.39
Johnson Buffalo 7 West-Southwest 1.19
Johnson Kaycee 17 East 1.17
Johnson Poker Creek 0.33
Johnson School House 0.26
Lincoln Willow Creek SNOTEL 2.00
Lincoln Cottonwood Creek SNOTEL 1.90
Lincoln Thayne 1 Southeast 1.48
Lincoln Thayne 4 Northeast 1.45
Lincoln Kelly Ranger Station SNOTEL 0.90
Lincoln Salt River Summit SNOTEL 0.80
Lincoln Indian Creek SNOTEL 0.70
Lincoln Spring Creek Divide SNOTEL 0.70
Lincoln Triple Peak SNOTEL 0.60
Lincoln Hams Fork SNOTEL 0.50
Lincoln Smoot 0.30
Lincoln Kemmerer 0.12
Natrona Midwest 1.30
Natrona Casper Mountain SNOTEL 1.10
Natrona Reno Hill SNOTEL 1.00
Natrona Casper Mountain Base 0.90
Natrona Casper Airport 0.29
Natrona Casper 4 West-Southwest 0.68
Natrona Casper 1 Southeast 0.57
Natrona Casper 6 Southwest 0.53
Natrona Casper 0.50
Natrona Casper 3 Northeast 0.49
Natrona Casper 7 West 0.40
Natrona Near Pathfinder Reservoir 0.16
Natrona Fales Rock 0.13
Natrona Near Martin’s Cove 0.11
Park Rattlesnake 2.04
Park Cody 1.82
Park Crandall Creek 1.30
Park Cody 7 North 1.28
Park Cody 7 North-Northeast 1.16
Park Cody Airport 1.15
Park Buffalo Bill Dam 1.14
Park Meeteetse 1.08
Park Crandall 1.03
Park Powell Field Station 1.00
Park Near Wapiti 0.88
Park Pahaska 0.80
Park Powell 0.68
Park East Entrance 0.49
Park Kirwin SNOTEL 0.40
Park Eagle 0.22
Sublette Gunsight Pass SNOTEL 0.90
Sublette Gros Ventre Summit SNOTEL 0.80
Sublette Loomis Park SNOTEL 0.60
Sublette Blind Bull Summit SNOTEL 0.50
Sublette Bondurant 1 Northwest 0.42
Sublette Boulder 3 East 0.40
Sublette Elkhart Park Guard Station SNOTEL 0.40
Sublette Pinedale 13 Southeast 0.40
Sublette Boulder 0.35
Sublette Big Sandy Opening SNOTEL 0.30
Sublette Pinedale 0.30
Sublette Pinedale Airport 0.30
Sublette Pinedale 14 Northwest 0.20
Sublette Boulder Lake 0.20
Sublette East Rim Divide SNOTEL 0.20
Sublette Hoback 0.17
Sublette Bondurant 0.10
Sublette Near La Barge 0.10
Sublette Snider Basin 0.07
Sublette Big Piney Airport 0.06
Sublette Warren Bridge 0.03
Sublette New Fork 0.02
Sweetwater Snow Springs Creek 0.15
Sweetwater Rock Springs Airport 0.23
Sweetwater Rock Springs 0.11
Teton Grand Targhee 1.40
Teton Moran 12 Northwest 0.96
Teton Near Jackson Lake Dam 0.93
Teton Base Camp SNOTEL 0.80
Teton Coyote Meadows 0.64
Teton Alta 0.63
Teton Phillips Bench SNOTEL 0.60
Teton Moran 0.35
Teton Burro Hill 0.23
Teton Moose 0.17
Teton Grand Teton 0.14
Teton Jackson 12 Northeast 0.13
Washakie Split Rock Creek 1.25
Washakie Ten Sleep 27 South 1.12
Washakie Ten Slepp 16 South Southeast 0.95
Washakie Leigh Creek 0.75
Washakie Ten Sleep 5 North 0.75
Washakie Worland 0.53
Washakie Worland Airport 0.40
Yellowstone Quadrant 1.23
Yellowstone Mammoth 1.12
Yellowstone Grassy Lake SNOTEL 1.00
Yellowstone Two Ocean Plateau SNOTEL 1.00
Yellowstone Bechler 0.70
Yellowstone Old Faithful 0.56
Yellowstone Lewis Lake Divide SNOTEL 0.50
Yellowstone Soda Butte Creek near Lamar 0.48
Yellowstone Snake River Station SNOTEL 0.40
Yellowstone Lake Yellowstone 0.33
Yellowstone Thumb Divide SNOTEL 0.20
Yellowstone Thorofare 0.04

Table 2.
Snowfall Totals (inches) as of 11:00 a.m.
Thursday, June 7, 2007
(SNOTEL Totals Estimated)
CountyGeneral Station NameSnowfall

Big Horn

Bone Springs Divide SNOTEL

13

Big Horn

Shell Creek SNOTEL

10

Big Horn

Bald Mountain SNOTEL

9

Fremont

Togwotee Pass SNOTEL

11

Fremont

Hobbs Park SNOTEL

8

Fremont

Townsend Creek SNOTEL

4

Fremont

Little Warm SNOTEL

4

Fremont

South Pass SNOTEL

3

Fremont

St Lawrence Alt SNOTEL

3

Fremont

Deer Park SNOTEL

2

Fremont

Cold Springs SNOTEL

2

Fremont

Dubois 10 Northwest

0.5

Hot Springs

Owl Creek SNOTEL

1

Johnson

Cloud Peak Reservoir SNOTEL

12

Johnson

Middle Powder SNOTEL

5

Johnson

Hansen Sawmill SNOTEL

4

Johnson

Bear Trap Meadow SNOTEL

2

Lincoln

Willow Creek SNOTEL

15

Lincoln

Spring Creek Divide SNOTEL

8

Lincoln

Kelly Ranger Station SNOTEL

6

Lincoln

Indian Creek SNOTEL

6

Lincoln

Salt River Summit SNOTEL

5

Lincoln

Hams Fork SNOTEL

4

Lincoln

Thayne

3.3

Lincoln

Thayne 4 Northeast

3.1

Lincoln

Triple Peak SNOTEL

2

Natrona

Casper Mountain SNOTEL

11

Natrona

Reno Hill SNOTEL

8

Natrona

Grave Springs SNOTEL

4

Park

Beartooth Lake SNOTEL

8

Park

Kirwin SNOTEL

6

Park

Parker Peak SNOTEL

2

Park

Timber Creek SNOTEL

2

Park

Younts Peak SNOTEL

1

Park

Evening Star SNOTEL

1

Park

Marquette SNOTEL

1

Park

Sylvan Road SNOTEL

1

Park

Blackwater SNOTEL

1

Park

Wolverine SNOTEL

1

Sublette

Gunsight Pass SNOTEL

8

Sublette

Big Sandy Opening SNOTEL

5

Sublette

New Fork Lake SNOTEL

4

Sublette

Pinedale 1 North

3

Sublette

Loomis Park SNOTEL

3

Sublette

Blind Bull Summit SNOTEL

3

Sublette

Elkhart Park SNOTEL

3

Sublette

Gros Ventre Summit SNOTEL

1

Sublette

Kendall Ranger Station SNOTEL

1

Sublette

Snider Basin Snow SNOTEL

1

Sublette

Pinedale 13 Southeast

1

Sublette

Pinedale 11 Northwest

0.5

Teton

Grand Targhee

11

Teton

Phillips Bench SNOTEL

3

Teton

Base Camp SNOTEL

2

Washakie

Powder River Pass SNOTEL

6

Yellowstone

Two Ocean Plateau SNOTEL

10

Yellowstone

Snake River Station SNOTEL

3

Yellowstone

Canyon SNOTEL

3

Yellowstone

Sylvan Lake SNOTEL

3

Yellowstone

Grassy Lake SNOTEL

3

Yellowstone

Thumb Divide SNOTEL

1

Yellowstone

Lewis Lake Divide SNOTEL

1

Table 3.
24-hour Peak Wind Gusts (mph) as of
around 7:00 a.m. Thursday, June 7, 2007 

CountyGeneral Station NameWind Gust (mph)
Big Horn Greybull Airport 62
Big Horn Mill Creek 39
Big Horn Hyatt High 37
Fremont Camp Creek 59
Fremont Beaver Rim 50
Fremont Riverton Airport 48
Fremont Arapahoe 42
Fremont Anderson Ridge 37
Fremont Wind River 34
Hot Springs Grass Creek Divide 65
Johnson Buffalo Airport 77
Johnson Poker Creek 62
Johnson Piney Creek 61
Johnson School House 47
Johnson I-25 Divide 44
Lincoln Kemmerer 41
Lincoln Opal 40
Lincoln Sage Junction 37
Natrona Casper Mountain 51
Natrona Casper 48
Natrona Pathfinder Dam 46
Natrona Hiland 44
Natrona Casper Airport 41
Natrona Twenty Mile Hill 40
Park Meeteetse Rim / Hwy 120 70
Park Powell 51
Park Cody Airport 43
Park Chief Joseph 34
Sublette Pinedale Airport 48
Sublette Pinedale 46
Sublette Big Piney Airport 41
Sweetwater I-80 Near Green River 52
Sweetwater Snow Springs Creek 49
Sweetwater Rock Springs Airport 48
Sweetwater Bitter Creek 45
Sweetwater Continental Divide 45
Sweetwater Shute Creek 43
Washakie Leigh Creek 47
Washakie Split Rock Creek 46



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