Flash Flood Warning 8, NWS Denver/Boulder, CO

NORTHEAST AND NORTH CENTRAL COLORADO AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER COLORADO
311 PM MDT FRI AUG 6 1999

CURRENTLY...PLENTY OF MOISTURE STILL OVER THE AREA WITH LOWER LEVELS
STILL WITH LOWER 60S DEW POINTS.  YESTERDAYS MAIN CONVECTION AXIS
SHIFTED SOUTH A BIT AS THE MIDNIGHT GUY THOUGHT...WITH SOUTHERN ZONE 46
AND ZONE 47 WITH THE BIGGEST PROBLEMS.  A LOT OF SAME IS IN PLACE
TODAY ESPECIALLY IN THE ABOVE MENTIONED ZONES...WITH THE REST OF THE
ZONES CURRENTLY ON TRACK FOR A MORE SCATTERED COVERAGE. WILL MENTION
HEAVY RAINS IN THE A FEW PLACE AND NO WATCHES FOR NOW.

UPPER RIDGE CENTER SHIFTS A BIT WEST THROUGH THE LATER PERIODS...
STILL REMAINING WELL TO OUR SOUTH.  WATER VAPOR PICTURES INDICATING
THE ADVERTISED DRYING IS PARTIALLY OCCURRING UPSTREAM...BUT
MONSOONS NOT OVER YET.  MOISTURE GRIDS SHOWING SOME DRYING FOR THE
WEEKEND...BUT EVEN IF THE DRY TOUGH ON THE WATER VAPOR PICTURES TO
OUR WEST GETS OVER THE AREA...SOME CONVECTION IS STILL PROBABLE...AS
CURRENT SITUATION INDICATES.  ALSO THERES SO MUCH SOIL MOISTURE
AROUND HERE...THAT THE LOW LEVELS SHOULD REMAIN WET FOR DAYS TO
COME.  THE THETA-E GRIDS SHOW A MOISTURE AXIS OVER THE FORECAST AREA
THROUGH SATURDAY EVENING...BUT STILL HAVE A WEAKER VERSION AROUND ON
SUNDAY.  THE CROSS SECTIONS AND FORECAST SOUNDINGS INDICATE AMPLE
POTENTIAL INSTABILITY...PRECIPITABLE WATER...AND HEATING...BUT THE
LAPSE RATE ARE ONLY FAIR TO GOOD.  SURFACE GRIDS HINT AT A LOW LEVEL
SURGE INTO THE PLAINS SATURDAY AFTERNOON.  OVERALL...WILL KEEP SOME
POPS IN ALL THE PERIODS IN ALL AREAS...LESS ON SUNDAY...AND WILL
HAVE LESS CLOUDS AND WARMER TEMPERATURES.

IN THE EXTENDED...THE DRYING TREND SUPPOSEDLY CONTINUES...ILL
PARTIALLY BUY IT...BUT NOT COMPLETELY...AND WILL STILL KEEP SOME
POPS IN.             RJK

.DEN...NONE.

COZ030-032>050-070600-

SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO
NATIONAL WEATHER SERVICE DENVER CO
1100 AM MDT FRI AUG 6 1999

THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES

ADAMS     ARAPAHOE     BOULDER   CLEAR CREEK   DENVER       DOUGLAS
ELBERT    GILPIN       GRAND     JACKSON       JEFFERSON    LARIMER
LINCOLN   LOGAN        MORGAN    PARK          PHILLIPS     SEDGWICK
SUMMIT    WASHINGTON   WELD

SYNOPSIS...THE AIR MASS OVER NORTH CENTRAL AND NORTHEASTERN COLORADO
WILL REMAIN MOIST AND RELATIVELY UNSTABLE THIS AFTERNOON AND TONIGHT.
MONSOONAL MOISTURE WILL CONTINUE TO FLOW NORTHWARD OVER THE AREA FROM
WESTERN MEXICO.  LOW LEVEL UPSLOPE FLOW OVER THE HIGH PLAINS WILL
CONTINUE TO PUSH MOISTURE AGAINST THE EAST FACE OF THE MOUNTAINS.
WITH THE AMOUNT OF MOISTURE IN A SAMPLE OF THE AIR MASS IN EXCESS OF
AN INCH...WHICH IS MORE THAN 150 PERCENT OF NORMAL FOR THIS TIME OF
YEAR...THE THREAT OF HEAVY THUNDERSTORM RAINS WILL CONTINUE EVEN THOUGH
THE WINDS ALOFT ARE A LITTLE STRONGER TODAY THAN YESTERDAY.  THIS WILL
PREVENT THE STORMS FROM REMAINING OVER ONE PLACE FOR AN EXTENDED PERIOD
OF TIME AND REDUCE THE TOTAL PRECIPITATION AT ANY ONE LOCATION.  HOWEVER...
SOILS REMAIN SATURATED FROM HEAVY RAIN DURING THE LAST FEW DAYS WHICH WILL
ALLOW MUCH OF THE ADDITIONAL RAINFALL TODAY TO RUNOFF INTO RIVERS AND
STREAMS MORE RAPIDLY.

AS THE AREAS OF FOG AND LOW CLOUDINESS OVER THE PLAINS BURN OFF BY
MIDDAY...SCATTERED SHOWERS AND THUNDERSTORMS WILL START TO DEVELOP
OVER THE MOUNTAINS AND EASTERN FOOTHILLS.  THESE STORMS WILL MOVE
SLOWLY TO THE EAST OVER THE FRONT RANGE URBAN CORRIDOR BEFORE MID
AFTERNOON AND ONTO THE NORTHEASTERN PLAINS BY LATE AFTERNOON.  THE
STORMS WILL CONTINUE INTO THE EVENING HOURS.  HEAVY THUNDERSTORM
RAINFALL MAY TOTAL UP TO 2 INCHES IN AN HOUR.  THIS AMOUNT OF
RAIN MAY CAUSE LOCAL FLOODING OF STREETS AND ROADWAYS...NORMALLY DRY
GULCHES AND LOW LYING OR FLOOD PRONE AREAS.  ROCK AND MUDSLIDES MAY
OCCUR IN THE STEEP TERRAIN OF MOUNTAIN AND FOOTHILLS CANYONS.

SPOTTER ACTIVATION WILL NOT BE REQUESTED.  HOWEVER ALL REPORTS OF
HEAVY RAINFALL...ONE INCH OR MORE IN AN HOUR...SHOULD BE RELAYED TO
THE NATIONAL WEATHER SERVICE.

GARD...WFO BOULDER

COZ030-032>050-070600-

SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO
NATIONAL WEATHER SERVICE DENVER CO
1100 AM MDT FRI AUG 6 1999

THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES

ADAMS     ARAPAHOE     BOULDER   CLEAR CREEK   DENVER       DOUGLAS
ELBERT    GILPIN       GRAND     JACKSON       JEFFERSON    LARIMER
LINCOLN   LOGAN        MORGAN    PARK          PHILLIPS     SEDGWICK
SUMMIT    WASHINGTON   WELD

SYNOPSIS...THE AIR MASS OVER NORTH CENTRAL AND NORTHEASTERN COLORADO
WILL REMAIN MOIST AND RELATIVELY UNSTABLE THIS AFTERNOON AND TONIGHT.
MONSOONAL MOISTURE WILL CONTINUE TO FLOW NORTHWARD OVER THE AREA FROM
WESTERN MEXICO.  LOW LEVEL UPSLOPE FLOW OVER THE HIGH PLAINS WILL
CONTINUE TO PUSH MOISTURE AGAINST THE EAST FACE OF THE MOUNTAINS.
WITH THE AMOUNT OF MOISTURE IN A SAMPLE OF THE AIR MASS IN EXCESS OF
AN INCH...WHICH IS MORE THAN 150 PERCENT OF NORMAL FOR THIS TIME OF
YEAR...THE THREAT OF HEAVY THUNDERSTORM RAINS WILL CONTINUE EVEN THOUGH
THE WINDS ALOFT ARE A LITTLE STRONGER TODAY THAN YESTERDAY.  THIS WILL
PREVENT THE STORMS FROM REMAINING OVER ONE PLACE FOR AN EXTENDED PERIOD
OF TIME AND REDUCE THE TOTAL PRECIPITATION AT ANY ONE LOCATION.  HOWEVER...
SOILS REMAIN SATURATED FROM HEAVY RAIN DURING THE LAST FEW DAYS WHICH WILL
ALLOW MUCH OF THE ADDITIONAL RAINFALL TODAY TO RUNOFF INTO RIVERS AND
STREAMS MORE RAPIDLY.

AS THE AREAS OF FOG AND LOW CLOUDINESS OVER THE PLAINS BURN OFF BY
MIDDAY...SCATTERED SHOWERS AND THUNDERSTORMS WILL START TO DEVELOP
OVER THE MOUNTAINS AND EASTERN FOOTHILLS.  THESE STORMS WILL MOVE
SLOWLY TO THE EAST OVER THE FRONT RANGE URBAN CORRIDOR BEFORE MID
AFTERNOON AND ONTO THE NORTHEASTERN PLAINS BY LATE AFTERNOON.  THE
STORMS WILL CONTINUE INTO THE EVENING HOURS.  HEAVY THUNDERSTORM
RAINFALL MAY TOTAL UP TO 2 INCHES IN AN HOUR.  THIS AMOUNT OF
RAIN MAY CAUSE LOCAL FLOODING OF STREETS AND ROADWAYS...NORMALLY DRY
GULCHES AND LOW LYING OR FLOOD PRONE AREAS.  ROCK AND MUDSLIDES MAY
OCCUR IN THE STEEP TERRAIN OF MOUNTAIN AND FOOTHILLS CANYONS.

SPOTTER ACTIVATION WILL NOT BE REQUESTED.  HOWEVER ALL REPORTS OF
HEAVY RAINFALL...ONE INCH OR MORE IN AN HOUR...SHOULD BE RELAYED TO
THE NATIONAL WEATHER SERVICE.

GARD...WFO BOULDER