Alert archive / Wyoming / Special Weather Statements in 2011
Special Weather Statement, NWS Riverton, WY
NWS Riverton, WY issued this special weather statement at Jul 11, 2011, 3:13 PM MDT for Sublette County, Wyoming. It was in force for 47 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 11, 2011, 3:13 PM MDT (21:13 UTC)
- Expired
- Jul 11, 2011, 4:00 PM MDT
- In force
- 47 min
- Issued by
- NWS Riverton, WY
County Sublette County, WY
The radar
The Riverton/Lander radar (KRIW), 134 km from the middle of the area, began a volume at 21:15 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
Grand Junction, CO (KGJT), launched 12:00Z, 9.2 hours before the alert went out and 396 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
- 171 J/kg
- Mixed-layer CIN
- -134 J/kg
- Mixed-layer LCL
- 1172 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</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 11, 2:26 PM MDT, 47 minutes earlier.
Area forecast discussion, Jul 11, 2:26 PM MDT, 47 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 226 PM MDT MON JUL 11 2011 .SHORT TERM...TONIGHT THROUGH WEDNESDAY NIGHT SOUTHWEST FLOW ALOFT WILL CONTINUE OVER WESTERN AND CENTRAL WYOMING WITH MONSOON MOISTURE COMING NORTH FROM THE GREAT BASIN INTO THE SOUTH...AND A PACIFIC TROUGH OFF THE BRITISH COLUMBIA COAST BRINGING PACIFIC MOISTURE INTO NORTHWEST WYOMING AND PRODUCING WEAK JET DYNAMICS...UPPER LEVEL DIVERGENCE. BEST LOW LEVEL MOISTURE IN THE NORTHEAST...BUT RESPECTABLE MOISTURE AVAILABLE OVER THE SOUTHWEST AS WELL. TYPICAL AFTERNOON CONVECTION FIRING OFF THE MOUNTAINS WILL SPREAD ACROSS THE AREA THIS EVENING. CONVECTION ACROSS UTAH AND WESTERN COLORADO WILL THEN MIGRATE NORTH INTO SOUTHERN WYOMING THROUGH THE NIGHT SUPPORTING SHOWERS AND THUNDERSTORMS INTO THE MORNING HOURS. MORE MOISTURE FROM THE SOUTH WILL BE IN PLACE ON TUESDAY WITH AN INCREASE IN SHOWER AND THUNDERSTORM COVERAGE. STILL WILL BE SOMEWHAT HIT AND MISS WITH NO GREAT FOCUS FOR IDENTIFYING AREAS WITH THE GREATEST THREAT FOR HEAVY RAIN. NOCTURNAL SHOWERS AND THUNDERSTORMS WILL AGAIN BE A THREAT THROUGH TUESDAY NIGHT. WEDNESDAY WILL START TO DRY OUT WITH A DECREASE IN COVERAGE. TEMPERATURES DURING THE DAY MAY BE SLIGHTLY COOLER WITH MORE CLOUD COVER AND PRECIPITATION. STRONG WIND GUSTS AND SMALL HAIL WILL BE THE MAIN THREAT WITH THUNDERSTORMS. LESS CONVECTION SHOULD BE SEEN WEDNESDAY NIGHT AS THE PACIFIC TROUGH MOVES EAST BRINGING A DRY SLOT OVER THE AREA WITH MUCH LOWER PRECIPITABLE WATER AVAILABLE. LOW LEVEL MOISTURE SHOULD DROP CONSIDERABLY WEDNESDAY NIGHT. .LONG TERM...THURSDAY THROUGH MONDAY GLOBAL MODELS ARE PROGGING A DRY SOUTHWEST FLOW ACROSS THE AREA THURSDAY THROUGH SATURDAY. VERY LITTLE OR NO DIURNAL CONVECTION IS EXPECTED. COULD SEE RED FLAG WEATHER CONDITIONS...BREEZY SW WIND AND VERY LOW RH...OVER PORTIONS OF THE AREA...BUT FUELS ARE NOT CONSIDERED CRITICAL AT THIS TIME. MODELS ARE SHOWING THE STRONG RIDGE OVER CENTRAL/SE CONUS SHIFTING WESTWARD THIS WEEKEND INTO EARLY NEXT WEEK...WITH SLIGHTLY HIGHER THICKNESS LEVELS. 700MB TEMPERATURES ARE EXPECTED TO RANGE BETWEEN 15 AND 20C BY EARLY NEXT WEEK. COULD SEE WIDESPREAD 90S AGAIN...WITH SOME AREAS POSSIBLY REACHING THE CENTURY MARK. ALTHOUGH THE RIDGE IS EXPECTED TO STRENGTHEN OVER THE AREA EARLY NEXT WEEK...MODELS ARE PROGGING A SLIGHTLY BETTER MOISTURE PROFILE THAN WHAT IS EXPECTED THURSDAY THROUGH SATURDAY. THUS...THE FORECAST AREA SHOULD SEE A BETTER SHOT AT ISOLATED AFTERNOON/EVENING CONVECTION SUNDAY AND MONDAY. TEMPERATURES WILL BE SEASONAL TO SLIGHTLY ABOVE AVERAGE THURSDAY THROUGH SATURDAY...WITH ABOVE AVERAGE TEMPERATURES BY 5-10 DEGREES POSSIBLE BY SUNDAY AND MONDAY. && .AVIATION... VFR CONDITIONS WILL PREVAIL TODAY AND TONIGHT. THUNDERSTORMS WILL ONCE AGAIN INITIATE ON THE NORTHERN FRINGE THE MONSOONAL PLUME OF MOISTURE OVER THE NORTHERN GREAT BASIN AND PUSH EAST NORTHEAST ACROSS WEST AND CENTRAL WYOMING. SCATTERED COVERAGE OF STORMS AND ISOLATED STRONGER STORMS WITH HEAVY RAIN AND HAIL ARE EXPECTED VCNTY WEST AND NORTH OF A KEVW-KPNA-KCOD-KBYG LINE THIS EVENING. A DRIER AIRMASS IN CENTRAL PORTIONS OF WYOMING...SOUTH OF THE AFOREMENTIONED LINE...WILL RESULT IN ELEVATED CONVECTION WITH ERRATIC OUTFLOW WIND GUSTS OF 35-45KT THE PRIMARY HAZARD. MOST STORMS WILL BE NORTH AND EAST OF WYOMING BY 08Z TUESDAY. BRIEF MVFR/IFR CONDITIONS IN HEAVY DOWNPOURS AND/OR BLOWING DUST WILL BE POSSIBLE WITH STRONGER STORMS. GREATER STORM COVERAGE IS EXPECTED ON TUES AS A SHORT WAVE MOVES THROUGH THE AREA. THE STRONGEST STORMS ARE EXPECTED VCNTY KBYG AND KCPR NORTH AND EAST WITH GUSTY WINDS AND HAIL AS THE PRIMARY THREATS. && .FIRE WEATHER... A MONSOONAL PLUME OF MOISTURE WILL PUSH FURTHER NORTH ACROSS THE AREA TONIGHT. STORMS WILL ONCE AGAIN INITIATE OVER THE NORTHERN GREAT BASIN AND PUSH EAST NORTHEAST ACROSS THE DISTRICT THIS EVENING WITH WIDELY SCATTERED COVERAGE EXPECTED OVER MOST OF THE DISTRICT LATE THIS AFTERNOON THROUGH EVENING. STRONGER STORMS WITH BETTER CHANCES OF WETTING RAIN OCCUR NEAR THE MONTANA BORDER WHILE A DRIER AIRMASS WILL RESULT IN MAINLY HIGH-BASED STORMS WITH GUSTY OUTFLOW WINDS FURTHER SOUTH. A SUB-TROPICAL DISTURBANCE WILL BRING A BETTER CHANCE OF WETTING RAINS WITH STORMS ACROSS THE ENTIRE DISTRICT ON TUESDAY. A DRIER AIRMASS WILL GRADUALLY PUSH INTO THE DISTRICT WEDNESDAY AND THURSDAY. NO DISCERNIBLE TEMPERATURE TREND IS EXPECTED OVER THE NEXT FEW DAYS. && .RIW WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...C.BAKER LONG TERM...WM AVIATION...ALLEN FIRE WEATHER...C.BAKER HYDROLOGY...C.BAKER
Hazardous weather outlook, Jul 11, 5:00 AM MDT, 10 hours 13 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 500 AM MDT MON JUL 11 2011 WYZ001>020-022>030-121200- ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS SOUTHEAST- BIGHORN MOUNTAINS WEST-CASPER MOUNTAIN-CODY FOOTHILLS- EAST SWEETWATER COUNTY-FLAMING GORGE- GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS- NATRONA COUNTY LOWER ELEVATIONS-NORTH BIG HORN BASIN- NORTHEAST JOHNSON COUNTY-OWL CREEK AND BRIDGER MOUNTAINS- ROCK SPRINGS AND GREEN RIVER-SALT RIVER AND WYOMING RANGES- SOUTH LINCOLN COUNTY-SOUTHEAST BIG HORN BASIN- SOUTHEAST JOHNSON COUNTY-SOUTHWEST BIG HORN BASIN-STAR VALLEY- TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN- UPPER GREEN RIVER BASIN FOOTHILLS-UPPER WIND RIVER BASIN- WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST- YELLOWSTONE NATIONAL PARK- 500 AM MDT MON JUL 11 2011 ...FLOOD WARNING FOR THE WIND RIVER AROUND RIVERTON AND FOR SMALLER CREEKS AND RIVERS OF SUBLETTE COUNTY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT ISOLATED TO SCATTERED THUNDERSTORMS WILL SPREAD OVER MUCH OF THE AREA TODAY...ESPECIALLY THIS AFTERNOON AND EVENING. THE PRIMARY HAZARDS ASSOCIATED WITH THIS STORM ACTIVITY WILL BE FREQUENT LIGHTNING...STRONG WIND AND SMALL HAIL. SNOWMELT DUE TO WARM TEMPERATURES WILL LEAVE SOME RIVERS AND STREAMS RUNNING HIGH AND SWIFT TODAY...ESPECIALLY OVER FREMONT AND SUBLETTE COUNTIES. ADDITIONALLY...THE YELLOWSTONE RIVER IN YELLOWSTONE NATIONAL PARK WILL REMAIN HIGH WITH NEAR RECORD FLOWS POSSIBLE THROUGH TONIGHT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ALL CREEKS AND RIVERS ACROSS WEST CENTRAL WYOMING WILL CONTINUE TO FALL BELOW FLOOD STAGES. WHILE RIVERS CONTINUE TO SLOWLY FALL...THEY WILL STILL RUN HIGH AND SWIFT. ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED TUESDAY AND WEDNESDAY AFTERNOON AND EVENINGS. SOME OF THE STORMS HAVE THE POTENTIAL TO BE STRONG...ESPECIALLY ON TUESDAY...WITH STRONG WINDS AND HAIL. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT SEVERE WEATHER AND FLOODING TO THE NATIONAL WEATHER SERVICE AT 1-800-211-1448. THANK YOU. TEAM RIVERTON
In the hours before
Special weather statement, Jul 11, 2:31 PM MDT, 42 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 231 PM MDT MON JUL 11 2011 WYZ024>026-112115- SALT RIVER AND WYOMING RANGES WY-UPPER GREEN RIVER BASIN WY-UPPER GREEN RIVER BASIN FOOTHILLS WY- 231 PM MDT MON JUL 11 2011 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL SUBLETTE COUNTY UNTIL 315 PM MDT... AT 224 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8 MILES WEST OF BIG PINEY...MOVING EAST AT 20 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. THIS STORM WILL BE NEAR... STATE HWY 350 AROUND 240 PM MDT. BIG PINEY AROUND 255 PM MDT. SUBLETTE COUNTY FAIRGROUNDS AND MARBLETON AROUND 300 PM MDT. HWY JCT 189 AND 351 AND U.S. HWY 189 MILE MARKER 110 AROUND 305 PM MDT. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. BRIEF HEAVY RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4286 10998 4235 10971 4233 11038 4263 11047 TIME...MOT...LOC 2031Z 271DEG 12KT 4258 11024 ALLEN
Special weather statement, Jul 11, 3:13 PM MDT, 0 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 313 PM MDT MON JUL 11 2011 WYZ025-026-112200- UPPER GREEN RIVER BASIN WY-UPPER GREEN RIVER BASIN FOOTHILLS WY- 313 PM MDT MON JUL 11 2011 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN SUBLETTE COUNTY UNTIL 400 PM MDT... AT 304 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR U.S. HWY 189 MILE MARKER 100...OR NEAR BIG PINEY...MOVING EAST AT 20 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. THIS STORM WILL BE NEAR... STATE HWY 351 MILE MARKER 10 AROUND 335 PM MDT. JONAH FIELD AROUND 400 PM MDT. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. BRIEF HEAVY RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4270 10978 4235 10962 4234 11020 4250 11029 TIME...MOT...LOC 2114Z 260DEG 16KT 4249 11003 ALLEN
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 2:31 PM MDT | Special Weather Statement | RIW | Sublette | 44 min |
| Jul 11, 3:37 PM MDT | Special Weather Statement | RIW | Sublette | 38 min |
| Jul 11, 4:13 PM MDT | Special Weather Statement | RIW | 47 min |
Nearby
Special Weather Statements in Wyoming, 2011Every special weather statement in 2011
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.