Damaging Wind in Wyoming, May 29, 2004

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
600 PM MDT SAT MAY 29 2004

.TONIGHT THROUGH TUESDAY...
UPDATED TO EXPIRE HIGH WIND WARNING FOR WIND RIVER BASIN.
UPPER LEVEL TROF AXIS MOVING EAST ACROSS WYOMING. UNSTABLE UPPER
LEVEL NORTHWEST FLOW ACROSS NORTHWEST WY HAS RESULTED IN PERIODS OF
SN IN THE MOUNTAINS...WITH SOME ACCUMULATION IN YNP AT OLD FAITHFUL
VIA THE WEBCAM. ALSO...ISOLD TSTMS DEVELOPING ACROSS NATRONA COUNTY
DUE TO LAPS INDICATING SOME LOW LEVEL SURFACE CONVERGENCE AND LIS IN
THE -1 TO -2 RANGE. UPPER LEVEL TROF TO MOVE EAST OF AREA TONIGHT
WITH UPPER LEVEL NORTHWEST FLOW FOR SUNDAY AND MONDAY. WILL KEEP SCT
POPS ACROSS THE NORTH TONIGHT AND SUNDAY NIGHT DUE A FEW SHORT WAVES
AND WEAK INSTABILITY. BEST COVERAGE OF LIGHT PCPN WILL BE ACROSS THE
NORTHWEST MOUNTAINS. DRIER WX FOR SUNDAY NIGHT AND MONDAY AN ONLY
LEFT SCT POPS ACROSS THE NORTHWEST MOUNTAINS. UPPER LEVEL RIDGE
BUILDS ACROSS WYOMING MONDAY NIGHT AND TUESDAY SO DRY WX. TEMPS WILL
REMAIN COOL FOR SUNDAY AND MONDAY AS 700 MB TEMPS REMAIN IN THE -5
TO 5 DEG C RANGE. LOWS IN THE UPPER TEENS TO 20S ACROSS THE WESTERN
MOUNTAINS A GOOD BET TONIGHT AND SUNDAY NIGHT. WARMER TEMPS FOR
TUESDAY DUE TO UPPER RIDGE BUILDING.

.TUESDAY NIGHT THROUGH FRIDAY...
HIGH PRESSURE SURFACE AND ALOFT BUILDS OVER THE AREA TUESDAY WITH
WARMER MORE SEASONABLE TEMPERATURES IN STORE.  UPPER RIDGE IS
EXPECTED TO BUILD THROUGH THURSDAY WITH TEMPERATURES WARMING INTO
THE 70S TO LOWER 80S...WITH MAINLY 60S IN THE MOUNTAINS.  MAY SEE
SOME WEAK SHORT WAVE TROUGHS MOVE OVER THE RIDGE WITH POSSIBLE
ISOLATED THUNDERSTORM DEVELOPMENT IN THE NORTH AND MOUNTAINS BUT
FOR NOW HAVE KEPT THE EXTENDED FORECAST DRY UNTIL FRIDAY.  SOME GULF
MOISTURE EXPECTED TO MOVE UP INTO SOUTHEAST WYOMING AND HAVE ADDED
SLIGHT CHANCE OF THUNDERSTORMS IN NATRONA...EASTERN SWEETWATER AND
EXTREME SOUTHEAST FREMONT COUNTY ON FRIDAY.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...NONE.

&&

MC/C.BAKER/AEM

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
503 AM MDT SAT MAY 29 2004

WYZ001>020-022>030-301103-
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-
503 AM MDT SAT MAY 29 2004

...MAJOR LATE SPRING STORM WILL CONTINUE TO AFFECT MUCH OF WESTERN
AND CENTRAL WYOMING TODAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT
ANOTHER ROUND OF SHOWERS ARE EXPECTED ACROSS THE AREA TODAY WITH
OCCASIONAL SNOW SHOWERS IN THE MOUNTAINS WHERE AN ADDITIONAL 2 TO 4
INCHES OF SNOW IS POSSIBLE. THE SNOW LEVEL WILL GENERALLY BE AROUND
7000 FEET BUT WILL FALL LOWER DURING HEAVIER SHOWERS AND ISOLATED
THUNDERSTORMS. ADDITIONAL PRECIPITATION AMOUNTS FROM ONE TENTH TO
ONE QUARTER OF AN INCH ARE EXPECTED BY THIS EVENING WITH LOCALIZED
AMOUNTS UP TO HALF AN INCH IN THE MOUNTAINS. TEMPERATURES WILL ONLY
BE IN THE 30S IN THE HIGH COUNTRY TODAY WITH 40S IN THE WESTERN
VALLEYS AND MAINLY 50S EAST OF THE DIVIDE

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY
SOME SHOWERS WILL LINGER ACROSS THE NORTH AND EAST SUNDAY...
ESPECIALLY IN THE NORTHWEST MOUNTAINS WHERE MORE LIGHT SNOWFALL IS
EXPECTED. SNOWFALL ON THE HIGHER NORTHWEST PEAKS MAY ACCUMULATE 1 TO
3 INCHES ON SUNDAY. MEMORIAL DAY ITSELF...SHOULD BE DRY AND A LITTLE
WARMER.

TRAVELLERS AND THOSE WITH OUTDOOR INTERESTS SHOULD PAY CLOSE
ATTENTION TO THE WEATHER THIS HOLIDAY WEEKEND.

.SPOTTER INFORMATION STATEMENT.

SPOTTER ARE REQUESTED TO REPORT ANY ACCUMULATING SNOWS AND
SIGNIFICANT RAINFALL TODAY.

SKRBAC