Alert archive / Colorado / Flash Flood Watches in 2011
Flash Flood Watch 6, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood watch at Jul 12, 2011, 3:49 AM MDT for 22 counties in Colorado. It took effect at Jul 12, 2011, 12:00 PM MDT. It was in force for 17 hr.
The area
The counties it named.
The facts
- Issued
- Jul 12, 2011, 3:49 AM MDT (09:49 UTC)
- In effect from
- Jul 12, 2011, 12:00 PM MDT
- Expired
- Jul 13, 2011, 5:18 AM MDT
- In force
- 17 hr
- Issued by
- NWS Denver/Boulder, CO
- Flood severity
- None
All 22 counties
Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Clear Creek County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Gilpin County, CO, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Park County, CO, Phillips County, CO, Sedgwick County, CO, Summit County, CO, Washington County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 21 km from the middle of the area, began a volume at 09:50 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
Denver, CO (KDNR), launched 00:00Z, 9.8 hours before the alert went out and 120 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
- 51 J/kg
- Mixed-layer CIN
- -132 J/kg
- Mixed-layer LCL
- 1622 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -43 m²/s²
- 0-3 km storm-relative helicity
- -29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
705 WGUS65 KBOU 120949 FFABOU URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE DENVER CO 349 AM MDT TUE JUL 12 2011 ...FLASH FLOOD THREAT WILL INCREASE THIS AFTERNOON AND EVENING IN THE MOUNTAINS...FOOTHILLS AND OVER NORTHEAST COLORADO... .THUNDERSTORMS WILL DEVELOP BY EARLY AFTERNOON IN THE MOUNTAINS AND FOOTHILLS WITH ADDITIONAL STORM DEVELOPMENT OVER THE FRONT RANGE URBAN CORRIDOR BY MID TO LATE AFTERNOON. OVER THE NORTHEAST PLAINS THUNDERSTORMS WILL INCREASE THIS EVENING AND CONTINUE OVERNIGHT. THE THUNDERSTORMS MAY PRODUCE VERY HEAVY RAINFALL OF 1 TO 2 INCHES IN LESS THAN HOUR IN THE MOUNTAINS AND FOOTHILLS WITH LOCALLY UP TO 3 INCHES IN A FEW LOCATIONS. ALONG THE FRONT RANGE URBAN CORRIDOR AND OVER THE PLAINS OF NORTHEAST COLORADO RAINFALL AMOUNTS UP TO 2 INCHES INCHES COULD OCCUR IN LESS THAN HOUR WITH LOCALLY UP TO 4 INCHES IN A FEW LOCATIONS. COZ033-034-121800- /O.NEW.KBOU.FF.A.0006.110712T1800Z-110713T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- INCLUDING...CAMERON PASS...LARAMIE AND MEDICINE BOW MOUNTAINS... RABBIT EARS RANGE...ROCKY MOUNTAIN NATIONAL PARK... WILLOW CREEK PASS...BERTHOUD PASS...BRECKENRIDGE... EAST SLOPES MOSQUITO RANGE...EAST SLOPES SOUTHERN GORE RANGE... EISENHOWER TUNNEL...INDIAN PEAKS...KENOSHA MOUNTAINS... MOUNT EVANS...WILLIAMS FORK MOUNTAINS...WINTER PARK 349 AM MDT TUE JUL 12 2011 ...FLASH FLOOD WATCH IN EFFECT FROM NOON MDT TODAY THROUGH THIS EVENING... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF CENTRAL COLORADO AND NORTH CENTRAL COLORADO...INCLUDING THE FOLLOWING AREAS...IN CENTRAL COLORADO...INDIAN PEAKS/MOUNTAINS OF SUMMIT COUNTY/KENOSHA MOUNTAINS/EAST SLOPE MOSQUITO RANGE. IN NORTH CENTRAL COLORADO...RABBIT EARS/MEDICINE BOW RANGES/ROCKY MOUNTAIN NATIONAL PARK. * FROM NOON MDT TODAY THROUGH THIS EVENING * RAINFALL AMOUNTS OF 1 TO 2 INCHES IN LESS THAN HOUR * WITH RIVERS AND STREAMS ALREADY RUNNING HIGH DUE TO PREVIOUS SNOWMELT ANY INTENSE HEAVY RAINFALL COULD QUICKLY LEAD TO FLASH FLOODING IN THE MOUNTAINS MAINLY EAST OF THE DIVIDE. PRECAUTIONARY/PREPAREDNESS ACTIONS... ...REPEAT THIS IS A WATCH AND NOT A WARNING... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE...BUT NOT IMMINENT...WITHIN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD KEEP AN EYE ON THE WEATHER AND BE PREPARED FOR IMMEDIATE ACTION SHOULD HEAVY RAINS AND FLASH FLOODING OCCUR...OR IF A FLASH FLOOD WARNING IS ISSUED. && $$ COZ035-036-038>041-043-121800- /O.NEW.KBOU.FF.A.0006.110712T2000Z-110713T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- 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- CENTRAL AND SOUTH WELD COUNTY- INCLUDING...ESTES PARK...GLENDEVEY...NEDERLAND... RED FEATHER LAKES...BAILEY...CENTRAL CITY...EVERGREEN... GEORGETOWN...IDAHO SPRINGS...WESTCREEK...FORT COLLINS... HEREFORD...LOVELAND...NUNN...ARVADA...BOULDER...GOLDEN... LAKEWOOD...LONGMONT...AURORA...BRIGHTON...CITY OF DENVER... DENVER INTERNATIONAL AIRPORT...HIGHLANDS RANCH...LITTLETON... PARKER...CASTLE ROCK...ELBERT...FONDIS...KIOWA...LARKSPUR... EATON...FORT LUPTON...GREELEY...ROGGEN 349 AM MDT TUE JUL 12 2011 ...FLASH FLOOD WATCH IN EFFECT FROM 2 PM MDT THIS AFTERNOON THROUGH THIS EVENING... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF CENTRAL COLORADO...NORTH CENTRAL COLORADO AND NORTHEAST COLORADO...INCLUDING THE FOLLOWING AREAS...IN CENTRAL COLORADO...SOUTHERN FRONT RANGE FOOTHILLS. IN NORTH CENTRAL COLORADO...NORTHERN FRONT RANGE FOOTHILLS. IN NORTHEAST COLORADO...BOULDER/WESTERN DENVER SUBURBS...GREELEY VICINITY/SOUTHERN WELD COUNTY...CASTLE ROCK/PALMER DIVIDE...FORT COLLINS VICINITY/NORTHWEST WELD COUNTY AND DENVER/SOUTHERN/NORTHERN/EASTERN DENVER SUBURBS. * FROM 2 PM MDT THIS AFTERNOON THROUGH THIS EVENING * RAINFALL AMOUNTS OF 1 TO 2 INCHES IN LESS THAN HOUR WITH LOCALLY UP TO 3 INCHES POSSIBLE IN THE FOOTHILLS AND 4 INCHES ALONG THE FRONT RANGE URBAN CORRIDOR. * WITH RIVERS AND STREAMS ALREADY RUNNING HIGH DUE TO PREVIOUS SNOWMELT ANY INTENSE HEAVY RAINFALL COULD QUICKLY LEAD TO FLASH FLOODING IN THE FOOTHILLS AND OVER THE FRONT RANGE URBAN CORRIDOR. PRECAUTIONARY/PREPAREDNESS ACTIONS... ...REPEAT THIS IS A WATCH AND NOT A WARNING... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE...BUT NOT IMMINENT...WITHIN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD KEEP AN EYE ON THE WEATHER AND BE PREPARED FOR IMMEDIATE ACTION SHOULD HEAVY RAINS AND FLASH FLOODING OCCUR...OR IF A FLASH FLOOD WARNING IS ISSUED. && $$ COZ042-044>046-048>051-121800- /O.NEW.KBOU.FF.A.0006.110713T0000Z-110713T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NORTHEAST WELD COUNTY-MORGAN COUNTY- CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES- NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN COUNTY-LOGAN COUNTY-WASHINGTON COUNTY-SEDGWICK COUNTY- PHILLIPS COUNTY- INCLUDING...BRIGGSDALE...GROVER...PAWNEE BUTTES...RAYMER... STONEHAM...BRUSH...FORT MORGAN...GOODRICH...WIGGINS...BENNETT... BYERS...DEER TRAIL...LEADER...AGATE...HUGO...LIMON...MATHESON... CROOK...MERINO...STERLING...PEETZ...AKRON...COPE...LAST CHANCE... OTIS...JULESBURG...OVID...SEDGWICK...AMHERST...HAXTUN...HOLYOKE 349 AM MDT TUE JUL 12 2011 ...FLASH FLOOD WATCH IN EFFECT FROM THIS EVENING THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF EAST CENTRAL COLORADO AND NORTHEAST COLORADO...INCLUDING THE FOLLOWING AREAS...IN EAST CENTRAL COLORADO...LIMON VICINITY. IN NORTHEAST COLORADO... RURAL ADAMS AND ARAPAHOE COUNTIES...LOGAN COUNTY...MORGAN COUNTY...NORTHEAST WELD COUNTY...PHILLIPS COUNTY...SEDGWICK COUNTY AND WASHINGTON COUNTY. * FROM THIS EVENING THROUGH LATE TONIGHT * THUNDERSTORMS WILL DEVELOP THIS EVENING AND CONTINUE OVERNIGHT. RAINFALL AMOUNTS UP TO 2 INCHES COULD OCCUR IN LESS THAN AN HOUR WITH LOCALLY UP TO 4 INCHES POSSIBLE. * WITH THE GROUND ALREADY SATURATED FROM RECENT RAINFALL ANY ADDITIONAL INTENSE HEAVY RAINFALL COULD QUICKLY LEAD TO FLASH FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... ...REPEAT THIS IS A WATCH AND NOT A WARNING... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE...BUT NOT IMMINENT...WITHIN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD KEEP AN EYE ON THE WEATHER AND BE PREPARED FOR IMMEDIATE ACTION SHOULD HEAVY RAINS AND FLASH FLOODING OCCUR...OR IF A FLASH FLOOD WARNING IS ISSUED. && $$
4 follow-up statements
729 WGUS65 KBOU 121813 FFABOU FLOOD WATCH NATIONAL WEATHER SERVICE DENVER CO 1213 PM MDT TUE JUL 12 2011 ...FLASH FLOOD THREAT WILL INCREASE THIS AFTERNOON AND EVENING IN THE MOUNTAINS...FOOTHILLS AND OVER NORTHEAST COLORADO... .THUNDERSTORMS WILL DEVELOP BY EARLY AFTERNOON IN THE MOUNTAINS AND FOOTHILLS WITH ADDITIONAL STORM DEVELOPMENT OVER THE FRONT RANGE URBAN CORRIDOR BY MID TO LATE AFTERNOON. OVER THE NORTHEAST PLAINS THUNDERSTORMS WILL INCREASE THIS EVENING AND CONTINUE OVERNIGHT. THE THUNDERSTORMS MAY PRODUCE VERY HEAVY RAINFALL OF 1 TO 2 INCHES IN LESS THAN HOUR IN THE MOUNTAINS AND FOOTHILLS WITH LOCALLY UP TO 3 INCHES IN A FEW LOCATIONS. ALONG THE FRONT RANGE URBAN CORRIDOR AND OVER THE PLAINS OF NORTHEAST COLORADO RAINFALL AMOUNTS UP TO 2 INCHES INCHES COULD OCCUR IN LESS THAN HOUR WITH LOCALLY UP TO 4 INCHES IN A FEW LOCATIONS. COZ033-034-130300- /O.CON.KBOU.FF.A.0006.000000T0000Z-110713T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- INCLUDING...CAMERON PASS...LARAMIE AND MEDICINE BOW MOUNTAINS... RABBIT EARS RANGE...ROCKY MOUNTAIN NATIONAL PARK... WILLOW CREEK PASS...BERTHOUD PASS...BRECKENRIDGE... EAST SLOPES MOSQUITO RANGE...EAST SLOPES SOUTHERN GORE RANGE... EISENHOWER TUNNEL...INDIAN PEAKS...KENOSHA MOUNTAINS... MOUNT EVANS...WILLIAMS FORK MOUNTAINS...WINTER PARK 1213 PM MDT TUE JUL 12 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF CENTRAL COLORADO AND NORTH CENTRAL COLORADO... INCLUDING THE FOLLOWING AREAS...IN CENTRAL COLORADO...INDIAN PEAKS/MOUNTAINS OF SUMMIT COUNTY/KENOSHA MOUNTAINS/EAST SLOPE MOSQUITO RANGE. IN NORTH CENTRAL COLORADO...RABBIT EARS/MEDICINE BOW RANGES/ROCKY MOUNTAIN NATIONAL PARK. * UNTIL 9 PM MDT THIS EVENING * RAINFALL AMOUNTS OF 1 TO 2 INCHES IN LESS THAN HOUR * WITH RIVERS AND STREAMS ALREADY RUNNING HIGH DUE TO PREVIOUS SNOWMELT ANY INTENSE HEAVY RAINFALL COULD QUICKLY LEAD TO FLASH FLOODING IN THE MOUNTAINS MAINLY EAST OF THE DIVIDE. PRECAUTIONARY/PREPAREDNESS ACTIONS... ...REPEAT THIS IS A WATCH AND NOT A WARNING... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE...BUT NOT IMMINENT...WITHIN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD KEEP AN EYE ON THE WEATHER AND BE PREPARED FOR IMMEDIATE ACTION SHOULD HEAVY RAINS AND FLASH FLOODING OCCUR...OR IF A FLASH FLOOD WARNING IS ISSUED. && $$ COZ035-036-038>041-043-130600- /O.CON.KBOU.FF.A.0006.110712T2000Z-110713T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- 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- CENTRAL AND SOUTH WELD COUNTY- INCLUDING...ESTES PARK...GLENDEVEY...NEDERLAND... RED FEATHER LAKES...BAILEY...CENTRAL CITY...EVERGREEN... GEORGETOWN...IDAHO SPRINGS...WESTCREEK...FORT COLLINS... HEREFORD...LOVELAND...NUNN...ARVADA...BOULDER...GOLDEN... LAKEWOOD...LONGMONT...AURORA...BRIGHTON...CITY OF DENVER... DENVER INTERNATIONAL AIRPORT...HIGHLANDS RANCH...LITTLETON... PARKER...CASTLE ROCK...ELBERT...FONDIS...KIOWA...LARKSPUR... EATON...FORT LUPTON...GREELEY...ROGGEN 1213 PM MDT TUE JUL 12 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF CENTRAL COLORADO...NORTH CENTRAL COLORADO AND NORTHEAST COLORADO...INCLUDING THE FOLLOWING AREAS...IN CENTRAL COLORADO...SOUTHERN FRONT RANGE FOOTHILLS. IN NORTH CENTRAL COLORADO...NORTHERN FRONT RANGE FOOTHILLS. IN NORTHEAST COLORADO...BOULDER/WESTERN DENVER SUBURBS...GREELEY VICINITY/SOUTHERN WELD COUNTY...CASTLE ROCK/PALMER DIVIDE... FORT COLLINS VICINITY/NORTHWEST WELD COUNTY AND DENVER/SOUTHERN/NORTHERN/EASTERN DENVER SUBURBS. * UNTIL MIDNIGHT MDT TONIGHT * RAINFALL AMOUNTS OF 1 TO 2 INCHES IN LESS THAN HOUR WITH LOCALLY UP TO 3 INCHES POSSIBLE IN THE FOOTHILLS AND 4 INCHES ALONG THE FRONT RANGE URBAN CORRIDOR. * WITH RIVERS AND STREAMS ALREADY RUNNING HIGH DUE TO PREVIOUS SNOWMELT ANY INTENSE HEAVY RAINFALL COULD QUICKLY LEAD TO FLASH FLOODING IN THE FOOTHILLS AND OVER THE FRONT RANGE URBAN CORRIDOR. PRECAUTIONARY/PREPAREDNESS ACTIONS... ...REPEAT THIS IS A WATCH AND NOT A WARNING... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE...BUT NOT IMMINENT...WITHIN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD KEEP AN EYE ON THE WEATHER AND BE PREPARED FOR IMMEDIATE ACTION SHOULD HEAVY RAINS AND FLASH FLOODING OCCUR...OR IF A FLASH FLOOD WARNING IS ISSUED. && $$ COZ042-044>046-048>051-130600- /O.CON.KBOU.FF.A.0006.110713T0000Z-110713T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NORTHEAST WELD COUNTY-MORGAN COUNTY- CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES- NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN COUNTY-LOGAN COUNTY-WASHINGTON COUNTY-SEDGWICK COUNTY- PHILLIPS COUNTY- INCLUDING...BRIGGSDALE...GROVER...PAWNEE BUTTES...RAYMER... STONEHAM...BRUSH...FORT MORGAN...GOODRICH...WIGGINS...BENNETT... BYERS...DEER TRAIL...LEADER...AGATE...HUGO...LIMON...MATHESON... CROOK...MERINO...STERLING...PEETZ...AKRON...COPE...LAST CHANCE... OTIS...JULESBURG...OVID...SEDGWICK...AMHERST...HAXTUN...HOLYOKE 1213 PM MDT TUE JUL 12 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 6 PM MDT THIS EVENING THROUGH LATE TONIGHT... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF EAST CENTRAL COLORADO AND NORTHEAST COLORADO... INCLUDING THE FOLLOWING AREAS...IN EAST CENTRAL COLORADO... LIMON VICINITY. IN NORTHEAST COLORADO...RURAL ADAMS AND ARAPAHOE COUNTIES...LOGAN COUNTY...MORGAN COUNTY...NORTHEAST WELD COUNTY...PHILLIPS COUNTY...SEDGWICK COUNTY AND WASHINGTON COUNTY. * FROM 6 PM MDT THIS EVENING THROUGH LATE TONIGHT * THUNDERSTORMS WILL DEVELOP THIS EVENING AND CONTINUE OVERNIGHT. RAINFALL AMOUNTS UP TO 2 INCHES COULD OCCUR IN LESS THAN AN HOUR WITH LOCALLY UP TO 4 INCHES POSSIBLE. * WITH THE GROUND ALREADY SATURATED FROM RECENT RAINFALL ANY ADDITIONAL INTENSE HEAVY RAINFALL COULD QUICKLY LEAD TO FLASH FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... ...REPEAT THIS IS A WATCH AND NOT A WARNING... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE...BUT NOT IMMINENT...WITHIN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD KEEP AN EYE ON THE WEATHER AND BE PREPARED FOR IMMEDIATE ACTION SHOULD HEAVY RAINS AND FLASH FLOODING OCCUR...OR IF A FLASH FLOOD WARNING IS ISSUED. && $$
672 WGUS65 KBOU 122225 FFABOU FLOOD WATCH NATIONAL WEATHER SERVICE DENVER CO 425 PM MDT TUE JUL 12 2011 ...FLASH FLOOD THREAT CONTINUES IN THE MOUNTAINS...FOOTHILLS AND OVER NORTHEAST COLORADO... .THUNDERSTORMS WILL CONTINUE TO DEVELOP IN THE MOUNTAINS AND FOOTHILLS AS WELL AS THE FRONT RANGE URBAN CORRIDOR THIS EVENING. THE STORMS WILL SPREAD ACROSS THE NORTHEAST PLAINS THIS EVENING AND CONTINUE OVERNIGHT. THE THUNDERSTORMS MAY PRODUCE VERY HEAVY RAINFALL OF 1 TO 2 INCHES IN LESS THAN HOUR IN THE MOUNTAINS AND FOOTHILLS WITH LOCALLY UP TO 3 INCHES IN A FEW LOCATIONS. ALONG THE FRONT RANGE URBAN CORRIDOR AND OVER THE PLAINS OF NORTHEAST COLORADO RAINFALL AMOUNTS UP TO 2 INCHES INCHES COULD OCCUR IN LESS THAN HOUR WITH LOCALLY UP TO 4 INCHES IN A FEW LOCATIONS. COZ033-034-130300- /O.CON.KBOU.FF.A.0006.000000T0000Z-110713T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- INCLUDING...CAMERON PASS...LARAMIE AND MEDICINE BOW MOUNTAINS... RABBIT EARS RANGE...ROCKY MOUNTAIN NATIONAL PARK... WILLOW CREEK PASS...BERTHOUD PASS...BRECKENRIDGE... EAST SLOPES MOSQUITO RANGE...EAST SLOPES SOUTHERN GORE RANGE... EISENHOWER TUNNEL...INDIAN PEAKS...KENOSHA MOUNTAINS... MOUNT EVANS...WILLIAMS FORK MOUNTAINS...WINTER PARK 425 PM MDT TUE JUL 12 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF CENTRAL COLORADO AND NORTH CENTRAL COLORADO... INCLUDING THE FOLLOWING AREAS...IN CENTRAL COLORADO...INDIAN PEAKS/MOUNTAINS OF SUMMIT COUNTY/KENOSHA MOUNTAINS/EAST SLOPE MOSQUITO RANGE. IN NORTH CENTRAL COLORADO...RABBIT EARS/MEDICINE BOW RANGES/ROCKY MOUNTAIN NATIONAL PARK. * UNTIL 9 PM MDT THIS EVENING * RAINFALL AMOUNTS OF 1 TO 2 INCHES IN LESS THAN HOUR * WITH RIVERS AND STREAMS ALREADY RUNNING HIGH DUE TO PREVIOUS SNOWMELT ANY INTENSE HEAVY RAINFALL COULD QUICKLY LEAD TO FLASH FLOODING IN THE MOUNTAINS MAINLY EAST OF THE DIVIDE. PRECAUTIONARY/PREPAREDNESS ACTIONS... ...REPEAT THIS IS A WATCH AND NOT A WARNING... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE...BUT NOT IMMINENT...WITHIN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD KEEP AN EYE ON THE WEATHER AND BE PREPARED FOR IMMEDIATE ACTION SHOULD HEAVY RAINS AND FLASH FLOODING OCCUR...OR IF A FLASH FLOOD WARNING IS ISSUED. && $$ COZ035-036-038>041-043-130600- /O.CON.KBOU.FF.A.0006.000000T0000Z-110713T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- 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- CENTRAL AND SOUTH WELD COUNTY- INCLUDING...ESTES PARK...GLENDEVEY...NEDERLAND... RED FEATHER LAKES...BAILEY...CENTRAL CITY...EVERGREEN... GEORGETOWN...IDAHO SPRINGS...WESTCREEK...FORT COLLINS... HEREFORD...LOVELAND...NUNN...ARVADA...BOULDER...GOLDEN... LAKEWOOD...LONGMONT...AURORA...BRIGHTON...CITY OF DENVER... DENVER INTERNATIONAL AIRPORT...HIGHLANDS RANCH...LITTLETON... PARKER...CASTLE ROCK...ELBERT...FONDIS...KIOWA...LARKSPUR... EATON...FORT LUPTON...GREELEY...ROGGEN 425 PM MDT TUE JUL 12 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF CENTRAL COLORADO...NORTH CENTRAL COLORADO AND NORTHEAST COLORADO...INCLUDING THE FOLLOWING AREAS...IN CENTRAL COLORADO...SOUTHERN FRONT RANGE FOOTHILLS. IN NORTH CENTRAL COLORADO...NORTHERN FRONT RANGE FOOTHILLS. IN NORTHEAST COLORADO...BOULDER/WESTERN DENVER SUBURBS...GREELEY VICINITY/SOUTHERN WELD COUNTY...CASTLE ROCK/PALMER DIVIDE... FORT COLLINS VICINITY/NORTHWEST WELD COUNTY AND DENVER/SOUTHERN/NORTHERN/EASTERN DENVER SUBURBS. * UNTIL MIDNIGHT MDT TONIGHT * RAINFALL AMOUNTS OF 1 TO 2 INCHES IN LESS THAN HOUR WITH LOCALLY UP TO 3 INCHES POSSIBLE IN THE FOOTHILLS AND 4 INCHES ALONG THE FRONT RANGE URBAN CORRIDOR. * WITH RIVERS AND STREAMS ALREADY RUNNING HIGH DUE TO PREVIOUS SNOWMELT ANY INTENSE HEAVY RAINFALL COULD QUICKLY LEAD TO FLASH FLOODING IN THE FOOTHILLS AND OVER THE FRONT RANGE URBAN CORRIDOR. PRECAUTIONARY/PREPAREDNESS ACTIONS... ...REPEAT THIS IS A WATCH AND NOT A WARNING... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE...BUT NOT IMMINENT...WITHIN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD KEEP AN EYE ON THE WEATHER AND BE PREPARED FOR IMMEDIATE ACTION SHOULD HEAVY RAINS AND FLASH FLOODING OCCUR...OR IF A FLASH FLOOD WARNING IS ISSUED. && $$ COZ042-044>046-048>051-130630- /O.CON.KBOU.FF.A.0006.110713T0000Z-110713T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NORTHEAST WELD COUNTY-MORGAN COUNTY- CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES- NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN COUNTY-LOGAN COUNTY-WASHINGTON COUNTY-SEDGWICK COUNTY- PHILLIPS COUNTY- INCLUDING...BRIGGSDALE...GROVER...PAWNEE BUTTES...RAYMER... STONEHAM...BRUSH...FORT MORGAN...GOODRICH...WIGGINS...BENNETT... BYERS...DEER TRAIL...LEADER...AGATE...HUGO...LIMON...MATHESON... CROOK...MERINO...STERLING...PEETZ...AKRON...COPE...LAST CHANCE... OTIS...JULESBURG...OVID...SEDGWICK...AMHERST...HAXTUN...HOLYOKE 425 PM MDT TUE JUL 12 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF EAST CENTRAL COLORADO AND NORTHEAST COLORADO... INCLUDING THE FOLLOWING AREAS...IN EAST CENTRAL COLORADO... LIMON VICINITY. IN NORTHEAST COLORADO...RURAL ADAMS AND ARAPAHOE COUNTIES...LOGAN COUNTY...MORGAN COUNTY...NORTHEAST WELD COUNTY...PHILLIPS COUNTY...SEDGWICK COUNTY AND WASHINGTON COUNTY. * THROUGH LATE TONIGHT * THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS EVENING AND PERSIST OVERNIGHT. RAINFALL AMOUNTS UP TO 2 INCHES COULD OCCUR IN LESS THAN AN HOUR WITH LOCALLY UP TO 4 INCHES POSSIBLE. * WITH THE GROUND ALREADY SATURATED FROM RECENT RAINFALL ANY ADDITIONAL INTENSE HEAVY RAINFALL COULD QUICKLY LEAD TO FLASH FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... ...REPEAT THIS IS A WATCH AND NOT A WARNING... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE...BUT NOT IMMINENT...WITHIN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD KEEP AN EYE ON THE WEATHER AND BE PREPARED FOR IMMEDIATE ACTION SHOULD HEAVY RAINS AND FLASH FLOODING OCCUR...OR IF A FLASH FLOOD WARNING IS ISSUED. && $$
617 WGUS65 KBOU 130606 FFABOU FLOOD WATCH NATIONAL WEATHER SERVICE DENVER CO 1206 AM MDT WED JUL 13 2011 ...FLASH FLOOD THREAT CONTINUES OVER NORTHEAST COLORADO... .THUNDERSTORMS WILL CONTINUE OVER THE NORTHEAST COLORADO PLAINS THROUGH THE EARLY MORNING HOURS. ADDITIONAL THUNDERSTORMS MAY PRODUCE HEAVY RAINFALL UP TO 2 INCHES IN LESS THAN AN HOUR. HEAVY RAIN SHOWERS AND THUNDERSTORMS HAVE MOSTLY COME TO AN END OVER THE FOOTHILLS AND URBAN CORRIDOR. COZ035-036-038>041-043-130715- /O.CAN.KBOU.FF.A.0006.000000T0000Z-110713T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- 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- CENTRAL AND SOUTH WELD COUNTY- INCLUDING...ESTES PARK...GLENDEVEY...NEDERLAND... RED FEATHER LAKES...BAILEY...CENTRAL CITY...EVERGREEN... GEORGETOWN...IDAHO SPRINGS...WESTCREEK...FORT COLLINS... HEREFORD...LOVELAND...NUNN...ARVADA...BOULDER...GOLDEN... LAKEWOOD...LONGMONT...AURORA...BRIGHTON...CITY OF DENVER... DENVER INTERNATIONAL AIRPORT...HIGHLANDS RANCH...LITTLETON... PARKER...CASTLE ROCK...ELBERT...FONDIS...KIOWA...LARKSPUR... EATON...FORT LUPTON...GREELEY...ROGGEN 1206 AM MDT WED JUL 13 2011 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF CENTRAL COLORADO...NORTH CENTRAL COLORADO AND NORTHEAST COLORADO HAS BEEN CANCELLED. HEAVY SHOWERS MOVED OVER THE URBAN CORRIDOR...PALMER DIVIDE AND WELD COUNTY THROUGH THE EVENING. REPORTS OF FLOODING PROBLEMS HAVE BEEN RECEIVED FROM WESTERN ELBERT COUNTY AND NORTHERN WELD COUNTY. URBAN FLOODING PROBLEMS ALSO OCCURRED IN NORTHERN AND EASTERN DENVER AFTER HEAVY RAINS MOVED THROUGH THE AREA. ISOLATED SHOWERS WILL CONTINUE OVER DENVER AND THE NORTHERN I-25 CORRIDOR THROUGH THE EARLY MORNING HOURS...BUT ADDITIONAL FLOODING PROBLEMS ARE EXPECTED TO BE MINIMAL. $$ COZ042-044>046-048>051-131200- /O.CON.KBOU.FF.A.0006.000000T0000Z-110713T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NORTHEAST WELD COUNTY-MORGAN COUNTY- CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES- NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN COUNTY-LOGAN COUNTY-WASHINGTON COUNTY-SEDGWICK COUNTY- PHILLIPS COUNTY- INCLUDING...BRIGGSDALE...GROVER...PAWNEE BUTTES...RAYMER... STONEHAM...BRUSH...FORT MORGAN...GOODRICH...WIGGINS...BENNETT... BYERS...DEER TRAIL...LEADER...AGATE...HUGO...LIMON...MATHESON... CROOK...MERINO...STERLING...PEETZ...AKRON...COPE...LAST CHANCE... OTIS...JULESBURG...OVID...SEDGWICK...AMHERST...HAXTUN...HOLYOKE 1206 AM MDT WED JUL 13 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 6 AM MDT WEDNESDAY... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF EAST CENTRAL COLORADO AND NORTHEAST COLORADO... INCLUDING THE FOLLOWING AREAS...IN EAST CENTRAL COLORADO... LIMON VICINITY. IN NORTHEAST COLORADO...RURAL ADAMS AND ARAPAHOE COUNTIES...LOGAN COUNTY...MORGAN COUNTY...NORTHEAST WELD COUNTY...PHILLIPS COUNTY...SEDGWICK COUNTY AND WASHINGTON COUNTY. * UNTIL 6 AM MDT WEDNESDAY * THUNDERSTORMS WILL CONTINUE OVERNIGHT. RAINFALL AMOUNTS UP TO 2 INCHES COULD OCCUR IN LESS THAN AN HOUR WITH LOCALLY UP TO 4 INCHES POSSIBLE. * WITH THE GROUND ALREADY SATURATED FROM RECENT RAINFALL ANY ADDITIONAL INTENSE HEAVY RAINFALL COULD QUICKLY LEAD TO FLASH FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... ...REPEAT THIS IS A WATCH AND NOT A WARNING... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE...BUT NOT IMMINENT...WITHIN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD KEEP AN EYE ON THE WEATHER AND BE PREPARED FOR IMMEDIATE ACTION SHOULD HEAVY RAINS AND FLASH FLOODING OCCUR...OR IF A FLASH FLOOD WARNING IS ISSUED. && $$
535 WGUS65 KBOU 131118 FFABOU FLOOD WATCH NATIONAL WEATHER SERVICE DENVER CO 518 AM MDT WED JUL 13 2011 COZ042-044>046-048>051-131230- /O.CAN.KBOU.FF.A.0006.000000T0000Z-110713T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NORTHEAST WELD COUNTY-MORGAN COUNTY- CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES- NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN COUNTY-LOGAN COUNTY-WASHINGTON COUNTY-SEDGWICK COUNTY- PHILLIPS COUNTY- INCLUDING...BRIGGSDALE...GROVER...PAWNEE BUTTES...RAYMER... STONEHAM...BRUSH...FORT MORGAN...GOODRICH...WIGGINS...BENNETT... BYERS...DEER TRAIL...LEADER...AGATE...HUGO...LIMON...MATHESON... CROOK...MERINO...STERLING...PEETZ...AKRON...COPE...LAST CHANCE... OTIS...JULESBURG...OVID...SEDGWICK...AMHERST...HAXTUN...HOLYOKE 518 AM MDT WED JUL 13 2011 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF EAST CENTRAL COLORADO AND NORTHEAST COLORADO HAS BEEN CANCELLED. THUNDERSTORMS WITH HEAVY RAINFALL HAVE MOVED OUT OF NORTHEAST COLORADO. SCATTERED RAIN SHOWERS WILL CONTINUE OVER THE NORTHEAST CORNER OF THE STATE THROUGH ABOUT 9 AM BUT NO ADDITIONAL FLOODING IS EXPECTED. $$
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Denver/Boulder, CO wrote its last area forecast discussion before this flash flood watch went out at Jul 12, 3:25 AM MDT, 24 minutes earlier.
Area forecast discussion, Jul 12, 3:25 AM MDT, 24 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER CO
325 AM MDT TUE JUL 12 2011
.SHORT TERM....INTERESTING FCST FOR LATER THIS AFTN AND TONIGHT.
FLOW OF SUBTROPICAL MOISTURE WILL CONTINUE OVER THE AREA IN SWLY
FLOW ALOFT AS A WEAK FNT MOVES INTO NERN CO LATER THIS MORNING THRU
THE AFTN HOURS. THIS FNTL BNDRY WILL EVENTUALLY INCREASE ELY LOW
LEVEL FLOW FM LATE AFTN INTO THE EARLY EVENING HOURS ALONG THE FNT
RANGE INTO THE HIGHER TERRAIN EAST OF THE DIVIDE. MAIN QUESTION FOR
LATER THIS AFTN AND EVENING IS WILL THE TSTMS THAT DEVELOP OVER THE
HIGHER TERRAIN ORGANIZE INTO AN MCS AND MOVE ACROSS THE PLAINS THIS
EVENING OR WILL THEY STAY FOCUSED IN AND NR THE FOOTHILLS WITH SOME
TRAINING OF CELLS. CURRENT WATER VAPOR LOOP SHOWS A WELL DEFINED
CIRCULATION OVER SERN AZ/SWRN NM WHICH IS LIFTING NNE. THE GFS
PICKS UP ON THIS FEATURE WHILE THE NAM DOES NOT. THE GFS LIFTS THIS
FEATURE INTO SCNTL CO BY EARLY EVENING AND THEN ACROSS NERN CO BY
12Z WED. ITS POSSIBLE IF THIS FEATURE MAINTAINS ITS CIRCULATION AS
IT MOVES INTO CO THIS EVENING THAT STORMS COULD CONTINUE TO REFIRE
ALONG AND NR THE FOOTHILLS BEFORE EVENTUALLY FOCUSING OVER THE NERN
PLAINS OVERNIGHT.
NATURALLY WITH HIGH PRECIPITABLE WATER VALUES AND RATHER SLOW STORM
MOTIONS SOME VERY HEAVY RAINS COULD OCCUR IN SOME AREAS WITH FLASH
FLOODING ESPECIALLY IF TRAINING OF CELLS DOES OCCUR. MEANWHILE WITH
RIVERS AND STREAMS RUNNING HIGH IN THE MTNS AND FOOTHILLS DUE TO
PREVIOUS SNOWMELT ANY SIGNIFICANT RAINFALL COULD LEAD TO SOME
PROBLEMS THUS WILL ISSUE A FLASH FLOOD WATCH FOR THE MTNS EAST OF
THE DIVIDE AND THE FOOTHILLS FOR THIS AFTN AND EVENING. ALONG THE
FRONT RANGE WILL ALSO HAVE A FLASH FLOOD WATCH FOR THIS AFTN AND
EVENING AS GROUND IS SATURATED FM PREVIOUS RAINFALL THE PAST WEEK.
OVER THE NERN PLAINS APPEARS BEST CHC FOR HEAVER RAINFALL WILL BE
OVERNIGHT AS AIRMASS INITIALLY WILL BE CAPPED THIS AFTN DUE TO
PASSAGE OF WK FNT. SVR POTENTIAL LOOKS TO BE ON THE LOW SIDE
HOWEVER WITH ELY LOW LEVEL FLOW AND SOME MID LVL SHEAR STILL CAN'T
COMPLETELY RULE OUT SOME ISOLD STRONGER STORMS WITH MARGINAL HAIL
AND GUSTY WET MICROBURST TYPE WINDS ALONG THE FRONT RANGE. ALSO IN
THIS TYPE OF SETUP IT WOULD NOT COMPLETELY SURPRISE ME IF A WEAK
TORNADO COULD OCCUR DUE TO LOWERING LCLS. FINALLY AS FOR HIGHS THIS
AFTN READINGS MAY HOLD IN THE 70S ALONG THE NE-CO BORDER BEHIND FNT
WHILE CLOSER TO THE FOOTHILLS HIGHS ARE IN THE LOWER TO MID 80S.
.LONG TERM...MODELS HAVE THE UPPER RIDGE CENTER OVER TEXAS WEDNESDAY
INTO THURSDAY...THEN IT MOVES INTO THE OKLAHOMA/KANSAS AREA BY
THURSDAY NIGHT. SOUTHWESTERLY FLOW ALOFT IS PROGGED OVER THE CWA
THROUGH THE PERIODS. BY THURSDAY NIGHT...A PRETTY DECENT UPPER
TROUGH IS RIGHT OVER THE NORTHWESTERN UNITED STATES COAST AND THE
FLOW ALOFT INCREASES SOMEWHAT OVER COLORADO. THERE IS BENIGN
SYNOPTIC SCALE ENERGY PROGGED FOR THE CWA ON THE QG VERTICAL
VELOCITY FIELDS FOR ALL THE PERIODS. THE LOW LEVEL WINDS ARE
EAST-SOUTHEASTERLY ON WEDNESDAY AND WEDNESDAY EVENING...THEN AGAIN
THURSDAY AFTERNOON AND EVENING. FOR MOISTURE...IT DRIES OUT A BIT
FROM TODAY AND TONIGHT...BUT NOT MUCH. THE BOUNDARY LAYER DEW
POINTS ARE IN THE LOWER 50S TO MID 60S FOR THE PLAINS AND FOOTHILLS
WEDNESDAY THROUGH THURSDAY NIGHT. PRECIPITABLE WATER VALUES ARE IN
THE 0.95 TO 1.25 INCH RANGE WEDNESDAY...WEDNESDAY NIGHT AND THURSDAY
NIGHT...WITH SLIGHTLY LOWER NUMBERS FOR THURSDAY DAY. THERE IS
PRETTY DECENT CAPE OVER THE PLAINS AND FOOTHILLS LATE DAY WEDNESDAY
...WITH VALUES GENERALLY FROM 1000-2500 J/KG. THERE IS LESS CAPE
PROGGED FOR THURSDAY...WITH FAIRLY DECENT VALUES OVER THE MOUNTAINS
...FOOTHILLS AND NORTHEAST CORNER. THE LAPSE RATE FIELDS SHOW A BIT
OF A MID LEVEL CAP FOR THE LATE DAY PERIODS. THE QPF FIELDS SHOW A
BIT OF MEASURABLE RAINFALL FOR ALL THE CWA LATE DAY WEDNESDAY.
THERE IS EVEN LESS LATE DAY THURSDAY...WITH IT MAINLY OVER THE
MOUNTAINS...FOOTHILLS AND PALMER RIDGE. OVERALL...THE MOISTURE
FETCH FROM THE MEXICAN MOUNTAINS IS NOT QUITE AS GOOD AS IT HAS
BEEN...BUT IT DOES NOT CUT OFF BY ANY MEANS. SO FOR POPS...WILL GET
THEM UP TO 30%S BY LATE DAY WEDNESDAY/WEDNESDAY EVENING...AND
20-30%S LATE DAY THURSDAY. FOR TEMPERATURES...WEDNESDAY'S HIGHS ARE
2-4 C WARMER THAN TODAY'S. THURSDAY'S HIGHS ARE 0-1.5 C WARMER THAN
WEDNESDAY'S. FOR THE LATER DAYS...FRIDAY THROUGH MONDAY...THE UPPER
RIDGE CENTER MOVES FROM KANSAS ON FRIDAY...THEN INTO NORTHERN
MISSOURI SATURDAY THROUGH MONDAY. THE SOUTHWESTERLY FLOW ALOFT IS
PROGGED TO CONTINUE OVER THE CWA MUCH OF THE PERIOD. AS WITH
WEDNESDAY AND THURSDAY FROM ABOVE...THE MID AND UPPER LEVEL
SUBTROPICAL MOISTURE CONTINUES TO MOVE OVER THE CWA ALL FOUR
DAYS...BUT NOT QUITE AS GOOD AS IT HAS BEEN. WILL KEEP POPS IN THE
20-30% RANGE. TEMPERATURES WILL BE NORMAL.
&&
.AVIATION...STRATUS IS MOVING SOUTH ACROSS SERN WY EARLY THIS
MORNING BEHIND A WK FNT AND IS APPROACHING THE BORDER. HOWEVER
NEITHER THE NAM...HRRR OR RUC EVER SHOW IT REACHING THE AIRPORT.
FOR NOW WILL BELIEVE THEM AND KEEP LOW CLOUDS OUT OF THE 12Z TAF.
FOR THIS AFTN AND EVENING COULD BE RATHER ACTIVE WITH TSTMS LIKELY
ANYTIME BETWEEN 21Z AND 03Z. IN FACT BOTH NAM AND GFS SHOW TSTM
THREAT COULD EVEN LINGER THRU 06Z BEFORE STORMS EVENTUALLY MOVE NE
OF AREA. STORMS WILL BE RATHER SLOW MOVING SO COULD SEE MVFR
CONDITIONS DUE TO HEAVY RAINFALL AT TIMES ALTHOUGH THREAT FOR SVR WX
WILL BE LOW. OVERNIGHT WITH ABUNDANT LOW LVL MOISTURE AND LIGHT
WINDS COULD SEE STRATUS DVLP AFTER MIDNIGHT WITH SOME FOG LATE
TONIGHT INTO WED MORNING.
&&
.HYDROLOGY...FLASH FLOOD THREAT WILL BE ELEVATED THIS AFTERNOON AND
EVENING AS POTENTIAL FOR HEAVY RAINFALL WILL INCREASE EAST OF THE
DIVIDE AND ALONG THE FRONT RANGE. RAINFALL AMOUNTS OF 1 TO 2 INCHES
WILL BE POSSIBLE WITH LOCALLY HIGHER AMOUNTS UP TO 4 INCHES POSSIBLE
IF THUNDERSTORM CELLS TRAIN ACROSS THE SAME AREAS.
SIGNIFICANT MOUNTAIN SNOWMELT RUNOFF CONTINUES ABOVE 12000 FEET.
STREAMS CONTINUE TO RUN NEAR TO ABOVE BANKFULL IN JACKSON
COUNTY...EASTERN GRAND COUNTY...BLUE RIVER IN SUMMIT COUNTY AND THE
BIG THOMPSON RIVER IN SOUTHWEST LARIMER COUNTY. STREAM LEVELS ARE
GENERALLY EXPECTED TO SLOWLY DECREASE OVER THE NEXT SEVERAL DAYS BUT
HEAVY RAINFALL FROM THUNDERSTORMS THIS AFTERNOON AND EVENING COULD
BRING RAPID RISES TO ALREADY SWOLLEN STREAMS.
THUNDERSTORM COVERAGE WILL DECREASE WEDNESDAY AND THURSDAY WITH LESS
RAINFALL EXPECTED.
FLOOD ADVISORIES...
HEADWATERS OF THE COLORADO RIVER AND ST LOUIS CREEK IN EASTERN
GRAND COUNTY THROUGH WEDNESDAY EVENING.
BIG THOMPSON RIVER THROUGH ESTES PARK IN LARIMER COUNTY THROUGH
THURSDAY AFTERNOON.
BLUE RIVER IN SUMMIT COUNTY THROUGH THURSDAY EVENING
NORTH PLATTE AND MICHIGAN RIVERS IN JACKSON COUNTY THROUGH
THIS MORNING
&&
.BOU WATCHES/WARNINGS/ADVISORIES...FLASH FLOOD WATCH FROM NOON UNTIL
9 PM THIS EVENING FOR MTN ZONES 33 AND 34...
...FLASH FLOOD WATCH FOR THE FOOTHILLS AND FRONT RANGE URBAN
CORRIDOR FROM 2 PM THIS THROUGH MIDNIGHT TONIGHT...ZNS
35..36..38..39..40..41 AND 43...
...FLASH FLOOD WATCH FROM 6 PM TONIGHT THROUGH 6 AM WEDNESDAY
MORNING FOR THE NERN PLAINS...ZNS 42..44..45..46..48..49..50 AND
51...
&&
RPK/RJKHazardous weather outlook, Jul 11, 10:47 AM MDT, 17 hours 2 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1047 AM MDT MON JUL 11 2011 COZ030>051-121200- 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- 1047 AM MDT MON JUL 11 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT ANOTHER ROUND OF AFTERNOON AND EVENING THUNDERSTORMS WILL OCCUR ACROSS THE AREA. THE STORMS WILL PRODUCE HEAVY RAIN...SMALL HAIL AND GUSTY WINDS. SOME OF THE STORMS MAY PRODUCE RAINFALL AMOUNTS UP TO AN INCH OVER THE MOUNTAINS AND ALONG THE FOOTHILLS WITH UP TO TWO INCHES ACROSS THE PLAINS. A FEW STORMS OVER THE FAR NORTHEAST CORNER COULD BECOME SEVERE WITH HAIL UP TO ONE INCH AND WIND GUSTS TO 60 MPH. SOME STORMS COULD LINGER PAST MIDNIGHT...MAINLY ACROSS THE PLAINS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY SHOWERS AND THUNDERSTORMS WILL BE LIKELY ON TUESDAY ACROSS THE OUTLOOK AREA...STARTING IN THE MOUNTAINS AND FOOTHILLS IN THE AFTERNOON AND SPREADING EASTWARD THEREAFTER...MOVING ACROSS THE FAR EASTERN PLAINS THROUGH THE EVENING AND PERHAPS CONTINUING WELL AFTER MIDNIGHT THERE. AS HAS BEEN THE CASE THE LAST SEVERAL DAYS...HEAVY RAINFALL WILL BE THE MAIN THREAT FROM THE THUNDERSTORMS. THE FLOW ALOFT WILL BE SOMEWHAT LIGHTER ON TUESDAY THAN IN RECENT DAYS... HEIGHTENING THE THREAT OF FLASH FLOODING FROM THE THUNDERSTORMS ...ESPECIALLY IN THE URBAN CORRIDOR...FOOTHILLS AND THE BURN AREAS IN THE FOOTHILLS. ALTHOUGH THUNDERSTORM ACTIVITY WILL STILL OCCUR IN THE AFTERNOONS AND EVENINGS AFTER TUESDAY...COVERAGE WILL NOT BE AS WIDESPREAD. AT THIS TIME IT APPEARS THAT THURSDAY MAY BE THE DRIEST DAY OF THE PERIOD. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT BUT RAINFALL REPORTS WILL BE APPRECIATED. D-L/ET
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 6:34 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Morgan, Weld | 29 min |
| Jul 11, 7:12 PM MDT | Areal Flood Advisory | BOU | Logan, Washington | 93 min |
| Jul 11, 9:08 PM MDT | Areal Flood Advisory | BOU | Phillips, Sedgwick | 82 min |
| Jul 12, 1:33 PM MDT | Areal Flood Advisory | BOU | Summit | 6 days |
| Jul 12, 2:02 PM MDT | River Flood Advisory | BOU | Grand | 54 hr |
| Jul 12, 3:21 PM MDT | Special Weather Statement | BOU | Boulder | 39 min |
| Jul 12, 4:16 PM MDT | Special Weather Statement | BOU | Arapahoe | 59 min |
| Jul 12, 4:25 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 45 min |
| Jul 12, 4:36 PM MDT | Areal Flood Advisory | BOU | Elbert | 84 min |
| Jul 12, 5:18 PM MDT | Areal Flood Advisory | BOU | Adams, Arapahoe, Denver | 23 min |
| Jul 12, 5:31 PM MDT | Special Weather Statement | BOU | Arapahoe | 44 min |
Nearby
Flash Flood Watches in Colorado, 2011Every flash flood watch 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.