Alert archive / Wyoming / Special Weather Statements in 2015
Special Weather Statement, NWS Riverton, WY
NWS Riverton, WY issued this special weather statement at Jul 27, 2015, 2:00 PM MDT for Washakie County, Wyoming. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 27, 2015, 2:00 PM MDT (20:00 UTC)
- Expired
- Jul 27, 2015, 2:45 PM MDT
- In force
- 45 min
- Issued by
- NWS Riverton, WY
County Washakie County, WY
The radar
The Riverton/Lander radar (KRIW), 159 km from the middle of the area, began a volume at 20:02 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Rapid City, SD (KRAP), launched 12:00Z, 8.0 hours before the alert went out and 342 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 237 J/kg
- Mixed-layer CIN
- -666 J/kg
- Mixed-layer LCL
- 1635 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Riverton, WY wrote its last area forecast discussion before this special weather statement went out at Jul 27, 12:00 PM MDT, 2 hours earlier.
Area forecast discussion, Jul 27, 12:00 PM MDT, 2 hours before
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</html>Hazardous weather outlook, Jul 27, 3:20 AM MDT, 10 hours 40 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 320 AM MDT MON JUL 27 2015 WYZ001>020-022>030-281100- YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS-CODY FOOTHILLS- NORTH BIG HORN BASIN-SOUTHWEST BIG HORN BASIN- SOUTHEAST BIG HORN BASIN-OWL CREEK AND BRIDGER MOUNTAINS- BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST- NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY- TETON AND GROS VENTRE MOUNTAINS-JACKSON HOLE- WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST- UPPER WIND RIVER BASIN-WIND RIVER BASIN-LANDER FOOTHILLS- GREEN MOUNTAINS AND RATTLESNAKE RANGE- NATRONA COUNTY LOWER ELEVATIONS-CASPER MOUNTAIN-STAR VALLEY- SALT RIVER AND WYOMING RANGES-UPPER GREEN RIVER BASIN FOOTHILLS- UPPER GREEN RIVER BASIN-SOUTH LINCOLN COUNTY- ROCK SPRINGS AND GREEN RIVER-FLAMING GORGE-EAST SWEETWATER COUNTY- 320 AM MDT MON JUL 27 2015 ...HIGH FIRE DANGER TODAY FOR MUCH OF CENTRAL WYOMING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT SEVERE THUNDERSTORMS WITH ALL HAZARDS POSSIBLE FROM A TORNADO TO FLASH FLOODING TO DAMAGING WINDS IN JOHNSON COUNTY AND THE NORTHERN BIGHORN BASIN THIS AFTERNOON ALONG A COLD FRONT. THUNDERSTORMS WILL ALSO BE POSSIBLE ACROSS WESTERN WYOMING THOUGH STORMS WILL BE LESS SEVERE...THEY WILL STILL BE CAPABLE OF PRODUCING HAIL AND GUSTY WINDS ALONG WITH DANGEROUS LIGHTNING. ELEVATED FIRE WEATHER CONDITIONS EAST OF THE DIVIDE AND ACROSS THE SOUTH...WHERE WINDS WILL BE STEADY AT 25 TO 35 MPH WITH FREQUENT GUSTS OVER 40 MPH...OUTDOOR BURNING IS STRONGLY DISCOURAGED ACROSS WESTERN AND CENTRAL WYOMING TODAY. TONIGHT...MUCH COLDER BEHIND THE FRONT WITH SNOW POSSIBLE ABOVE 9000FT IN NORTHWEST WYOMING INCLUDING YELLOWSTONE NATIONAL PARK AND GRAND TETON NATIONAL PARK. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY TUESDAY...COOLER...WITH FREEZING TEMPERATURES POSSIBLE IN THE WESTERN MOUNTAINS AND VALLEYS. ELEVATED FIRE WEATHER CONDITIONS CONTINUE OVER SOUTHERN WYOMING. SUNDAY...ISOLATED THUNDERSTORMS ACROSS THE NORTH. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT HEAVY RAIN...ALL SEVERE THUNDERSTORM HAZARDS IN ADDITION TO WIND GUSTS GREATER THAN 45 MPH AND ANY WIND DAMAGE. THANK YOU.
In the hours before
Special weather statement, Jul 27, 2:00 PM MDT, 0 minutes before
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</html>The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 6:23 PM MDT | Special Weather Statement | RIW | 37 min | |
| Jul 27, 2:03 PM MDT | Special Weather Statement | RIW | Natrona | 27 min |
| Jul 27, 2:18 PM MDT | Special Weather Statement | RIW | Park | 42 min |
| Jul 27, 2:24 PM MDT | Special Weather Statement | RIW | 36 min | |
| Jul 27, 2:55 PM MDT | Special Weather Statement | RIW | 35 min | |
| Jul 27, 3:43 PM MDT | Special Weather Statement | RIW | Big Horn | 32 min |
| Jul 27, 3:48 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn | 27 min |
| Jul 27, 4:12 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn | 33 min |
| Jul 27, 4:12 PM MDT | Severe Thunderstorm Warning | RIW | Fremont, Hot Springs | 48 min |
| Jul 27, 4:39 PM MDT | Special Weather Statement | RIW | 36 min | |
| Jul 27, 4:51 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 23 min |
Nearby
Special Weather Statements in Wyoming, 2015Every special weather statement in 2015
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.