Alert archive / Wyoming / Special Weather Statements in 2015

Special Weather Statement, NWS Riverton, WY

July 27, 2015Washakie County, Wyoming

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.

Skew-T log-pSkew-T log-p diagram, Rapid City, SD at 12:00Z on 2015-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 237 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 12:00Z on 2015-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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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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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The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 26, 6:23 PM MDTSpecial Weather StatementRIW37 min
Jul 27, 2:03 PM MDTSpecial Weather StatementRIWNatrona27 min
Jul 27, 2:18 PM MDTSpecial Weather StatementRIWPark42 min
Jul 27, 2:24 PM MDTSpecial Weather StatementRIW36 min
Jul 27, 2:55 PM MDTSpecial Weather StatementRIW35 min
Jul 27, 3:43 PM MDTSpecial Weather StatementRIWBig Horn32 min
Jul 27, 3:48 PM MDTSevere Thunderstorm WarningRIWBig Horn27 min
Jul 27, 4:12 PM MDTSevere Thunderstorm WarningRIWBig Horn33 min
Jul 27, 4:12 PM MDTSevere Thunderstorm WarningRIWFremont, Hot Springs48 min
Jul 27, 4:39 PM MDTSpecial Weather StatementRIW36 min
Jul 27, 4:51 PM MDTSevere Thunderstorm WarningRIWFremont23 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.