000
FLUS45 KCYS 151616
HWOCYS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
1015 AM MDT WED MAY 15 2013

WYZ101>119-161000-
CONVERSE COUNTY LOWER ELEVATIONS-NIOBRARA COUNTY-
NORTH LARAMIE RANGE-FERRIS/SEMINOE/SHIRLEY MOUNTAINS-
SHIRLEY BASIN-CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY-
EAST PLATTE COUNTY-GOSHEN COUNTY-CENTRAL CARBON COUNTY-
NORTH SNOWY RANGE FOOTHILLS-SOUTHWEST CARBON COUNTY-
SIERRA MADRE RANGE-UPPER NORTH PLATTE RIVER BASIN-SNOWY RANGE-
LARAMIE VALLEY-SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS-
CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY-
1015 AM MDT WED MAY 15 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL WYOMING...
SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A SHORTWAVE TROUGH ALOFT...OR WEATHER DISTURBANCE...WILL MOVE SLOWLY
NORTHEAST INTO CENTRAL UTAH THIS AFTERNOON...THEN ACROSS SOUTHEAST
WYOMING AND WESTERN NEBRASKA TONIGHT. IN RESPONSE...SURFACE LOW
PRESSURE WILL STRENGTHEN ACROSS EASTERN COLORADO AND EASTERN
WYOMING...PRODUCING MOIST UPSLOPE EAST AND SOUTHEAST WINDS...AND
ADVECTING INCREASING LOW LEVEL MOISTURE WESTWARD TOWARDS THE LARAMIE
RANGE AND THE INTERSTATE 25 CORRIDOR.

THESE FEATURES WILL COMBINE WITH A DEVELOPING LOW LEVEL CONVERGENCE
AXIS FROM CASPER TO CHEYENNE THIS AFTERNOON...ALONG WITH DAYTIME
HEATING TO PRODUCE SCATTERED TO NUMEROUS THUNDERSTORMS FROM 200 PM
TO 800 PM TODAY...PRIMARILY ALONG AND WEST OF INTERSTATE 25...WITH
THE GREATEST AREAL COVERAGE OF STORMS OVER AND NEAR THE MOUNTAINS.

FOR THIS AFTERNOON...THE THREATS FROM STORMS WILL BE LOCALLY HEAVY
RAINFALL...HAIL UP TO THREE QUARTERS INCH IN DIAMETER...AND WIND
GUSTS TO 55 MPH. STORMS WILL MOVE TO THE NORTHEAST AT ONLY 10
MPH...AND COMBINED WITH THE RELATIVELY MOIST ATMOSPHERE...MORE MOIST
THAN NORMAL...RAINFALL AMOUNTS UP TO ONE INCH PER HOUR WILL OCCUR
WITH THE STRONGER THUNDERSTORMS.

FOR TONIGHT...AS THE SHORTWAVE TROUGH ALOFT...OR WEATHER
DISTURBANCE...MOVES ACROSS OUR COUNTIES...SCATTERED THUNDERSTORMS
WILL DEVELOP AND PROPAGATE OVER SOUTHEAST WYOMING ALONG AND EAST OF
INTERSTATE 25...AND THEN ACROSS WESTERN NEBRASKA...WHERE SOME
THUNDERSTORMS WILL PERSIST THROUGH THE LATE NIGHT HOURS.

THE MAIN THREATS FROM THUNDERSTORMS TONIGHT WILL BE LOCALLY HEAVY
RAINFALL AMOUNTS UP TO ONE INCH PER HOUR...SMALL HAIL UP TO THREE
QUARTERS INCH IN DIAMETER...MAINLY IN THE EVENING HOURS...AND WIND
GUSTS TO 50 MPH. STORM MOVEMENT WILL BE TO THE NORTHEAST AT 20 MPH.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

ISOLATED WEAKER THUNDERSTORMS WILL DEVELOP OVER SOUTHEAST WYOMING
THURSDAY AFTERNOON AND EVENING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.

&&

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND
CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT...
HTTP://WEATHER.GOV/CHEYENNE

$$

NEZ002-003-019>021-054-055-095-096-161000-
DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-
NORTH SIOUX-SOUTH SIOUX-
1015 AM MDT WED MAY 15 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA
PANHANDLE.

.DAY ONE...TODAY AND TONIGHT

A SHORTWAVE TROUGH ALOFT...OR WEATHER DISTURBANCE...WILL MOVE SLOWLY
NORTHEAST INTO CENTRAL UTAH THIS AFTERNOON...THEN ACROSS SOUTHEAST
WYOMING AND WESTERN NEBRASKA TONIGHT. IN RESPONSE...SURFACE LOW
PRESSURE WILL STRENGTHEN ACROSS EASTERN COLORADO AND EASTERN
WYOMING...PRODUCING MOIST UPSLOPE EAST AND SOUTHEAST WINDS...AND
ADVECTING INCREASING LOW LEVEL MOISTURE TOWARDS THE LARAMIE RANGE
AND THE INTERSTATE 25 CORRIDOR.

ONLY ISOLATED THUNDERSTORMS ARE EXPECTED THIS AFTERNOON ACROSS
WESTERN NEBRASKA AFTER 200 PM. THESE THUNDERSTORMS WILL PRODUCE WIND
GUSTS TO 45 MPH.

FOR TONIGHT...AS THE SHORTWAVE TROUGH ALOFT...OR WEATHER
DISTURBANCE...MOVES ACROSS OUR COUNTIES...SCATTERED THUNDERSTORMS
WILL DEVELOP AND MOVE OVER SOUTHEAST WYOMING ALONG AND EAST OF
INTERSTATE 25...AND THEN ACROSS WESTERN NEBRASKA...WHERE SOME
THUNDERSTORMS WILL PERSIST THROUGH THE LATE NIGHT HOURS.

THE MAIN THREATS FROM THUNDERSTORMS TONIGHT WILL BE LOCALLY HEAVY
RAINFALL AMOUNTS UP TO ONE INCH PER HOUR...SMALL HAIL UP TO THREE
QUARTERS INCH IN DIAMETER...PRIMARILY THIS EVENING...AND WIND GUSTS
TO 50 MPH. STORM MOVEMENT WILL BE TO THE NORTHEAST AT 20 MPH.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

ISOLATED TO SCATTERED THUNDERSTORMS...SOME STRONG...WILL DEVELOP
ACROSS WESTERN NEBRASKA THURSDAY AFTERNOON AND EVENING...WITH
THREATS BEING WIND GUSTS TO 55 MPH...HAIL UP TO THREE QUARTER OF AN
INCH IN DIAMETER AND LOCALLY HEAVY RAIN UP TO ONE INCH PER HOUR.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.

&&

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND
CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT...
HTTP://WEATHER.GOV/CHEYENNE

$$

RUBIN