Alert archive / Colorado / Flash Flood Watches in 2013

Flash Flood Watch 1, NWS Denver/Boulder, CO

July 14, 20137 counties in Colorado

NWS Denver/Boulder, CO issued this flash flood watch at Jul 14, 2013, 4:45 AM MDT for 7 counties in Colorado. It took effect at Jul 14, 2013, 12:00 PM MDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued
Jul 14, 2013, 4:45 AM MDT (10:45 UTC)
In effect from
Jul 14, 2013, 12:00 PM MDT
Expired
Jul 15, 2013, 12:00 AM MDT
In force
12 hr
Issued by
NWS Denver/Boulder, CO
Flood severity
None

Counties Boulder County, CO, Clear Creek County, CO, Douglas County, CO, Gilpin County, CO, Jefferson County, CO, Larimer County, CO, Park County, CO

The radar

The Denver radar (KFTG), 74 km from the middle of the area, began a volume at 10:44 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 10.8 hours before the alert went out and 435 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.

Skew-T log-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 00:00Z on 2013-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 761 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 00:00Z on 2013-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
761 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
2892 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

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 14, 3:07 AM MDT, 1 hour 38 minutes earlier.

Area forecast discussion, Jul 14, 3:07 AM MDT, 1 hour 38 minutes before
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Hazardous weather outlook, Jul 13, 10:37 AM MDT, 18 hours 8 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
1037 AM MDT SAT JUL 13 2013

COZ030>051-141645-
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-
1037 AM MDT SAT JUL 13 2013

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS WILL AGAIN DEVELOP AROUND NOON
OVER THE MOUNTAINS AND FOOTHILLS...BEFORE SPREADING EAST ONTO THE
PLAINS DURING THE AFTERNOON AND EVENING. EXPECT HEAVY RAIN...SMALL
HAIL AND GUSTY WINDS. RAINFALL RATES UP TO ONE INCH IN 30 MINUTES
OR EVEN LESS WILL BE POSSIBLE WITH THE STRONGER STORMS. THE FIRE
BURN AREAS WILL BE SUSCEPTIBLE TO FLASH FLOODING DUE TO THE HIGHER
MOISTURE CONTENT AND RELATIVELY SLOW STORM MOTIONS. STORMS WILL
GRADUALLY DIMINISH BY LATER THIS EVENING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SHOWERS AND THUNDERSTORMS WILL DEVELOP AGAIN ON SUNDAY AND ARE
LIKELY TO BE MORE NUMEROUS ESPECIALLY OVER AND ALONG THE FRONT
RANGE. THESE SLOW MOVING STORMS WILL BE CAPABLE OF HEAVY RAINFALL
DURING THE AFTERNOON AND EVENING HOURS. RAINFALL RATES UP TO 2
INCHES IN ONE HOUR WILL BE POSSIBLE WITH THE STRONGEST STORMS.
THESE RAINFALL AMOUNTS WOULD PRODUCE ADDITIONAL FLASH FLOODING
CONCERNS IN BURN SCARS...WITH POSSIBLE FLOODING IN URBANIZED
AREAS AS WELL. SHOWERS AND THUNDERSTORMS COULD LINGER ALL
NIGHT...WITH STORMS ENDING IN MOST AREAS MONDAY MORNING. DRIER AIR
WILL THEN SPREAD OVER THE REGION BEGINNING MONDAY AFTERNOON...WITH
ONLY A SLIGHT CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS MAINLY
IN THE HIGH COUNTRY THROUGH THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT...HOWEVER
HEAVY RAINFALL AND FLOODING REPORTS WILL BE APPRECIATED.

RJK/BARJENBRUCH

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 13, 7:11 PM MDTFlash Flood WarningBOULincoln3 hr
Jul 13, 7:25 PM MDTSevere Thunderstorm WarningBOUWashington50 min
Jul 13, 7:37 PM MDTAreal Flood AdvisoryBOUWashington113 min
Jul 13, 10:06 PM MDTAreal Flood AdvisoryBOULincoln3 hr
Jul 14, 2:30 PM MDTAreal Flood AdvisoryBOULarimer2 hr
Jul 14, 4:05 PM MDTAreal Flood AdvisoryBOULarimer115 min

Nearby

Flash Flood Watches in Colorado, 2013Every flash flood watch in 2013

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.