Hazardous Weather Outlook
Issued by NWS Denver/Boulder, CO

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FLUS45 KBOU 151214
HWOBOU

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
614 AM MDT FRI MAY 15 2015

COZ030>051-161215-
JACKSON COUNTY BELOW 9000 FEET-
WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET-
GRAND AND SUMMIT COUNTIES BELOW 9000 FEET-
SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/
NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET-
SOUTH AND SOUTHEAST GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/
GILPIN/CLEAR CREEK/SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE
9000 FEET-LARIMER AND BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET-
JEFFERSON AND WEST DOUGLAS COUNTIES ABOVE 6000 FEET/GILPIN/CLEAR
CREEK/NORTHEAST PARK COUNTIES BELOW 9000 FEET-
CENTRAL AND SOUTHEAST PARK COUNTY-
LARIMER COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY-
BOULDER AND JEFFERSON COUNTIES BELOW 6000 FEET/WEST BROOMFIELD
COUNTY-
NORTH DOUGLAS COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND
ARAPAHOE COUNTIES/EAST BROOMFIELD COUNTY-
ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES ABOVE 6000 FEET-
NORTHEAST WELD COUNTY-CENTRAL AND SOUTH WELD COUNTY-MORGAN COUNTY-
CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES-
NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN
COUNTY-
SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN COUNTY-
LOGAN COUNTY-WASHINGTON COUNTY-SEDGWICK COUNTY-PHILLIPS COUNTY-
614 AM MDT FRI MAY 15 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL
COLORADO.

.DAY ONE...TODAY AND TONIGHT

SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND EARLY THIS
EVENING IN NORTHEASTERN COLORADO. THE RISK IS MAINLY NORTH OF A
LINE FROM CHEYENNE TO AKRON. A LOW PRESSURE CENTER OVER
NORTHEASTERN COLORADO WILL HAVE INCREASING WINDS ROTATING AROUND
IT...WITH MOISTURE SPREADING FROM THE PLAINS INTO THE NORTHERN AND
EASTERN BORDER AREAS. THE WIND PATTERN WILL BE MOST FAVORABLE FOR
SEVERE THUNDERSTORMS AND TORNADOES IN AREAS NORTH AND NORTHEAST OF
THE LOW PRESSURE AREA. THE MAIN THREATS WILL BE LARGE HAIL UP TO
GOLF BALL SIZE AND WIND GUSTS TO 70 MPH...BUT THERE IS AN ELEVATED
THREAT OF TORNADOES NEAR THE NORTHERN COLORADO BORDER THIS
AFTERNOON.

ACROSS THE REST OF NORTHERN COLORADO SOUTH WINDS WILL INCREASE ON
THE PLAINS...WITH GUSTS TO NEAR 40 MPH. SCATTERED THUNDERSTORMS
WILL DEVELOP OVER AND NEAR THE MOUNTAINS...WITH ONLY ISOLATED
STORMS OVER THE PLAINS SOUTH OF INTERSTATE 70. THE MAIN THREAT
FROM STORMS ACROSS THE REST OF THE AREA WILL BE GUSTY WINDS AND
BRIEF HEAVY RAIN.

THE THREAT OF STRONG TO SEVERE THUNDERSTORMS WILL END THIS
EVENING...THOUGH SCATTERED WEAKER SHOWERS WILL CONTINUE OVERNIGHT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE NEXT SYSTEM WILL MOVE ON SATURDAY...BRINGING WITH IT A BETTER
CHANCE OF PRECIPITATION ACROSS THE REGION. SNOW ACCUMULATION OF 2
TO 5 INCHES WILL BE POSSIBLE IN THE HIGH COUNTRY ABOVE 10 THOUSAND
FEET. THE RISK OF SEVERE THUNDERSTORMS WILL LIKELY BE CONTINUE TO
AREAS ALONG THE EASTERN BORDER WHERE THE BEST VERTICAL SHEAR WILL
BE PRESENT. THE SHOWERS WILL DECREASE SATURDAY NIGHT WITH GUSTY
WINDS DEVELOPING FROM THE FRONT RANGE FOOTHILLS EASTWARD.

A RIDGE OF HIGH PRESSURE WILL MOVE OVER COLORADO ON SUNDAY...BUT
ENOUGH MOISTURE AND INSTABILITY WILL BE AROUND IN THE AFTERNOON
FOR A CHANCE OF SHOWERS AND A FEW THUNDERSTORMS. A COLD FRONT WILL
MOVE INTO THE FRONT RANGE SUNDAY EVENING WITH A CHANCE OF SHOWERS
AND SOME STORMS AT THAT TIME. ON MONDAY...THERE WILL BE A CHANCE
OF SHOWERS AND THUNDERSTORMS IN THE MOUNTAINS...BUT THE PLAINS
WILL STAY RELATIVELY DRY. THE NEXT SYSTEM WILL BRING ANOTHER ROUND
OF PRECIPITATION TO MUCH OF NORTH CENTRAL AND NORTHEAST COLORADO
LATE MONDAY NIGHT THROUGH TUESDAY EVENING. WEDNESDAY INTO
THURSDAY...THE SYSTEM WILL SHIFT TO THE NORTH BUT MOIST AND
UNSETTLED CONDITIONS WILL LINGER WITH A SLIGHT CHANCE OF AFTERNOON
AND EVENING SHOWERS AND THUNDERSTORMS BOTH DAYS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED AFTER 1 PM.

$$

GIMMESTAD/COOPER


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