Alert archive / Colorado / Flash Flood Watches in 2010
Flash Flood Watch 3, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood watch at Jul 31, 2010, 4:26 AM MDT for 4 counties in Colorado. It took effect at Jul 31, 2010, 6:00 AM MDT. It was in force for 15 hr.
The area
The counties it named.
The facts
- Issued
- Jul 31, 2010, 4:26 AM MDT (10:26 UTC)
- In effect from
- Jul 31, 2010, 6:00 AM MDT
- Expired
- Jul 31, 2010, 9:00 PM MDT
- In force
- 15 hr
- Issued by
- NWS Denver/Boulder, CO
- Flood severity
- None
Counties Arapahoe County, CO, Douglas County, CO, Elbert County, CO, Lincoln County, CO
The radar
The Denver radar (KFTG), 59 km from the middle of the area, began a volume at 10:29 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
Grand Junction, CO (KGJT), launched 00:00Z, 10.4 hours before the alert went out and 368 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
- 286 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 2832 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 31, 3:35 AM MDT, 51 minutes earlier.
Area forecast discussion, Jul 31, 3:35 AM MDT, 51 minutes before
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</html>Hazardous weather outlook, Jul 30, 10:46 AM MDT, 17 hours 40 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1046 AM MDT FRI JUL 30 2010 COZ030>051-311200- 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- 1046 AM MDT FRI JUL 30 2010 ...FLASH FLOOD WATCH REMAINS IN EFFECT FOR THIS AFTERNOON AND EVENING ACROSS THE PALMER DIVIDE...SOUTHERN FRONT RANGE FOOTHILLS AND PARK COUNTY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL AGAIN DEVELOP EARLY THIS AFTERNOON ACROSS THE MOUNTAINS AND FRONT RANGE FOOTHILLS...THEN SPREAD OUT ONTO THE ADJACENT PLAINS BY LATER THIS AFTERNOON. STORMS WILL BE MORE NUMEROUS ALONG AND SOUTH OF THE INTERSTATE 70 CORRIDOR WHERE MOISTURE LEVELS ARE HIGHER. DRIER AND A BIT MORE STABLE AIRMASS IS MOVING IN FROM NORTHWEST COLORADO...SO LOCATIONS NORTH OF INTERSTATE 70 AND STRETCHING OUT INTO THE FAR NORTHEAST PLAINS WILL SEE LESS THUNDERSTORM ACTIVITY. AS IN PREVIOUS DAYS...THE MAIN THREAT WITH THE STORMS WILL BE HEAVY RAIN AND POSSIBLE FLASH FLOODING WITH THE WEAK FLOW ALOFT IN THE ATMOSPHERE. PARK...SOUTHERN JEFFERSON...AND DOUGLAS COUNTIES WILL SEE THE HIGHEST THREAT OF FLASH FLOODING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE WILL BE A CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS EACH DAY THIS WEEKEND...A BIT MORE NUMEROUS ACROSS THE MOUNTAINS AND HIGHER TERRAIN. THE MAIN THREAT WITH THESE STORMS WILL BE HEAVY RAIN. THE CHANCE WILL INCREASE FOR THE PLAINS MONDAY AS A COOL FRONT MOVES SOUTH INTO NORTHERN COLORADO. TEMPERATURES WILL BE SLIGHTLY ABOVE SEASONABLE NORMALS FOR THE WEEKEND THEN DROP TO NEAR NORMAL MONDAY THROUGH THURSDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT...HOWEVER HEAVY RAINFALL AND FLOODING REPORTS WILL BE APPRECIATED. ENTREKIN/KRIEDERMAN
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 6:33 PM MDT | Areal Flood Advisory | BOU | Arapahoe, Denver, Douglas | 79 min |
| Jul 30, 7:06 PM MDT | Areal Flood Advisory | BOU | Douglas | 84 min |
| Jul 30, 7:55 PM MDT | Areal Flood Advisory | BOU | Douglas | 95 min |
| Jul 31, 12:20 AM MDT | Areal Flood Advisory | BOU | Lincoln | 85 min |
| Jul 31, 2:30 PM MDT | Areal Flood Advisory | BOU | Washington | 90 min |
Nearby
Flash Flood Watches in Colorado, 2010Every flash flood watch in 2010
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.