Alert archive / Colorado / Areal Flood Advisories in 2012
Areal Flood Advisory 13, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this areal flood advisory at Jul 5, 2012, 4:42 PM MDT for Boulder County, Colorado. It was in force for 68 min.
The area
The counties it named.
The facts
- Issued
- Jul 5, 2012, 4:42 PM MDT (22:42 UTC)
- Expired
- Jul 5, 2012, 5:50 PM MDT
- In force
- 68 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
County Boulder County, CO
The radar
The Denver radar (KFTG), 77 km from the middle of the area, began a volume at 22:44 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 12:00Z, 10.7 hours before the alert went out and 183 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
- 313 J/kg
- Mixed-layer CIN
- -227 J/kg
- Mixed-layer LCL
- 1462 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -29 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal flood advisory 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 areal flood advisory went out at Jul 5, 3:10 PM MDT, 1 hour 32 minutes earlier.
Area forecast discussion, Jul 5, 3:10 PM MDT, 1 hour 32 minutes before
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</html>Hazardous weather outlook, Jul 5, 11:13 AM MDT, 5 hours 29 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1113 AM MDT THU JUL 05 2012 COZ030>051-061200- 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- 1113 AM MDT THU JUL 05 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT MOISTURE LEVELS HAVE INCREASED ACROSS THE ENTIRE AREA SINCE YESTERDAY. THIS SHOULD RESULT IN A BETTER CHANCE OF SHOWERS AND THUNDERSTORMS THIS AFTERNOON AND EVENING...WITH THE HIGHEST COVERAGE EXPECTED IN THE MOUNTAINS AND FOOTHILLS AS WELL AS NEAR THE WYOMING BORDER. EXPECT HEAVY RAIN...SMALL HAIL...FREQUENT LIGHTNING...AND GUSTY WINDS WITH THE STORMS. RAINFALL RATES MAY APPROACH AN INCH IN 30 MINUTES WITH THE STRONGER STORMS WHICH COULD CREATE SOME FLOODING ISSUES IF ONE OF THESE MOVES OVER A BURN SCAR. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THERE WILL BE A CHANCE OF AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS FROM FRIDAY THROUGH NEXT WEDNESDAY FOR ALL THE FORECAST AREA. WITH HOW DRY IT HAS BEEN FOR THE LAST SEVERAL WEEKS...ANY FLOODING ISSUES WILL INITIALLY BE MINIMAL...WITH THE EXCEPTION OF THE PREVIOUS BURNED AREAS IN THE MOUNTAINS AND FOOTHILLS. IF THIS EXPECTED PERIOD OF INCREASED MOISTURE AVAILABILITY DOES IN FACT COME TO FRUITION...REPEATED EXCESSIVE RAINFALL EVENTS WILL OBVIOUSLY INCREASE THE THREAT OF FLASH FLOODING. TEMPERATURES SHOULD BE MORE NEAR SEASONAL NORMALS THROUGH THE PERIOD AS WELL. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. DBB/RJK
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 8:25 PM MDT | Special Weather Statement | BOU | Phillips | 35 min |
| Jul 5, 1:07 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Grand, Larimer | 27 min |
| Jul 5, 2:11 PM MDT | Areal Flood Advisory | BOU | Larimer | 116 min |
| Jul 5, 2:54 PM MDT | Areal Flood Advisory | BOU | Clear Creek | 96 min |
| Jul 5, 3:56 PM MDT | Areal Flood Advisory | BOU | Boulder | 94 min |
| Jul 5, 4:17 PM MDT | Flash Flood Warning | BOU | Boulder | 118 min |
| Jul 5, 4:42 PM MDT | Areal Flood Advisory | BOU | Boulder | 93 min |
Nearby
Areal Flood Advisories in Colorado, 2012Every areal flood advisory in 2012
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.