Alert archive / Colorado / Flash Flood Warnings in 1996

Flash Flood Warning 2, NWS Denver/Boulder, CO

July 13, 1996Jefferson County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Jul 13, 1996, 2:30 AM MDT for Jefferson County, Colorado. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 13, 1996, 2:30 AM MDT (08:30 UTC)
Expired
Jul 13, 1996, 5:00 AM MDT
In force
3 hr
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

County Jefferson County, CO

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 8.5 hours before the alert went out and 176 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, Denver, CO at 00:00Z on 1996-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1200 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 1996-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -30 square meters per square second.193958Sfc1 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
1200 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
1461 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-30 m²/s²
0-3 km storm-relative helicity
190 m²/s²
Significant tornado parameter
0.4
Supercell composite
5.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KDEN 130835 RRA
FFWDEN
COC059-131100-

BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
230 AM MDT SAT JUL 13 1996

...FLASH FLOOD WARNING FOR SOUTHERN JEFFERSON COUNTY UNTIL 5 AM...

   INCLUDING THE FOLLOWING LOCATIONS
      
      BUFFALO CREEK...RIVERVIEW...FERNDALE...NIGHTHAWK...    
      AND TWIN CEDARS

EVEN THOUGH THE RAINS HAVE SUBSIDED...FLOODING IS STILL OCCURING 
FROM BUFFALO CREEK NORTHWARD TO THE PLATTE RIVER ALONG COUNTY ROAD 
96. THIS AREA COVERS RIVERVIEW AND FERNDALE. FLOODING IS ALSO 
OCCURING ALONG THE SOUTH PLATTE FROM NIGHTHAWK NORTHWARD TO THE TOWN 
OF SOUTH PLATTE. ROADS IN THE ABOVE AREAS ARE FLOODED AND 
IMPASSABLE. DO NOT TRY TO CROSS FLOODED ROADWAYS.

AT 220 AM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED NO 
THUNDERSTORM ACTIVITY OVER SOUTHERN JEFFERSON COUNTY. RADAR 
ESTIMATED OVER 2 INCHES OF RAIN HAD FALLEN OVER THE BUFFALO CREEK 
BURN AREA YESTERDAY ALLOWING THE GROUND TO SATURATE QUICKLY.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR
OCCURRING.  IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER
GROUND IMMEDIATELY.  RESIDENTS LIVING ALONG STREAMS AND CREEKS
SHOULD TAKE IMMEDIATE PRECAUTIONS.  DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.  IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND
SEEK HIGHER GROUND.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
FORECAST OFFICE IN DENVER.

ENTREKIN

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 12, 8:31 PM MDT, 5 hours 59 minutes before
COZ044-045-049-046-041-130330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
830 PM MDT FRI JUL 12 1996

...THUNDERSTORMS IN NORTHEAST COLORADO...

CLUSTERS OF THUNDERSTORMS MOVING THROUGH DOUGLAS...ELBERT...LINCOLN...
WASHINGTON...MORGAN AND EASTERN ADAMS AND ARAPAHOE COUNTIES ARE DUMPING
HEAVY RAIN AND SMALL HAIL.  THE HEAVY RAIN IS FALLING IN SOME LOCATIONS
AT THE RATE OF 1 INCH PER HOUR.  THE THUNDERSTORMS ARE MOVING TO THE
SOUTHEAST ABOUT 10-20 MPH.

ANYONE TRAVELLING ON I-70 EAST OF DENVER OR I-76 THROUGH MORGAN COUNTY
AS WELL AS OTHER ROADS IN NORTHEAST COLORADO SHOULD DRIVE WITH CAUTION
AND BE ALERT FOR HEAVY RAIN CAUSING LOCAL FLOODING OF STREETS AND
HIGHWAYS ESPECIALLY IN LOW LYING AREAS.

MANY SMALL STREAMS AND CREEKS WILL BE RUNNING QUITE HIGH AND FAST.
DO NOT TRY TO FORD OR WADE ACROSS RAIN SWOLLEN STREAMS.

MOST OF THE THUNDERSTORMS ARE SLOWLY WEAKENING BUT WILL CONTINUE TO
RUMBLE UNTIL WELL AFTELR DARK.

A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF EASTERN COLORADO UNTIL
MIDNIGHT.

END...BOODA...WSFO DENVER
Special weather statement, Jul 12, 10:52 PM MDT, 3 hours 38 minutes before
COZ040-130530-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1049 PM MDT FRI JUL 12 1996

...ANOTHER THUNDERSTORM CRUSING THROUGH THE DENVER AREA...

A STRONG THUNDERSTORM IS MOVING SOUTH THROUGH THE DENVER METRO AREA
BRINGING MORE HEAVY RAIN...HAIL AND FREQUENT LIGHTNING.  THE AREAS
MOST AFFECTED BY THIS THUNDERSTORM WILL BE ARVADA...DENVER...LAKEWOOD
EDGEWATER...LEYDEN...MOUNTAIN VIEW...WESTMINSTER AND WHEAT RIDGE

AT 1050 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A THUNDERSTORM OVER ARVADA ...OR ABOUT 12 MILES NORTHWEST OF
DENVER.

HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES.  AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS
AS THEY MAY BE WASHED OUT.  WATER LEVELS OF SMALL STREAMS AND
RIVERS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF
THREATENED BY FLOOD WATERS.

END...BOODA...WSFO DENVER
Special weather statement, Jul 12, 11:02 PM MDT, 3 hours 28 minutes before
COZALL-130530-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1049 PM MDT FRI JUL 12 1996

...TORNADO WATCH FOR EASTERN COLORADO CANCELLED...

THE TORNADO WATCH THAT COVERED A LARGE PORTION OF EASTERN COLORADO HAS
BEEN CANCELLED AT 11 PM MDT.  ALTHOUGH A COUPLE OF THUNDERSTORMS ARE
STILL RUMBLING IN THE DENVER AREA AND OVER THE PALMER DIVIDE...THEY ARE
WEAKENING AND NO FURTHER SEVERE WEATHER IS EXPECTED IN NORTHEAST
COLORADO TONIGHT".

END...BOODA...WSFO DENVER
Special weather statement, Jul 12, 11:58 PM MDT, 2 hours 32 minutes before
COZ038-039-040-041-130700-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1155 PM MDT FRI JUL 12 1996

...LOCAL HEAVY RAIN CONTINUES ALONG FRONT RANGE...

SCATTERED SHOWERS AND THUNDERSTORMS STRETCH FROM NEAR LYONS IN LARIMER
COUNTY SOUTHEAST THROUGH BOULDER...SOUTHWEST WELD...DENVER AND INTO
DOUGLAS AND ELBERT COUNTIES.  THESE CELLS CONTINUE TO MOVE SOUTHEAST
ABOUT 10-20 MPH AND ARE CAUSING MODERATE TO HEAVY RAIN IN A FEW
LOCATIONS.  THE ADDITIONAL RAIN WILL EXACERBATE THE LOCAL FLOODING OF
STREETS AND SMALL STREAMS THROUGH THE EARLY MORNING HOURS.  SMALL HAIL
IS ALSO POSSIBLE WITH SOME OF THE THUNDERSTORMS.

MOTORISTS NEED TO REMAIN ALERT FOR FLOODED ROADS AND HIGHWAYS ESPECIALLY
IN LOW LYING AREAS.  AVOID SWOLLEN AND SWIFT FLOWING STREAMS.

A FLASH FLOOD WARNING CONTINUES IN EFFECT UNTIL 2 AM MDT FOR PORTIONS
OF JEFFERSON AND PARK COUNTIES MAINLY IN THE AREA WHERE A WILDFIRE
DENUDED THE LANDSCAPE AROUND BUFFALO CREEK.

END...BOODA...WSFO DENVER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 6:35 PM MDTSevere Thunderstorm WarningBOUWashington40 min
Jul 12, 7:02 PM MDTSevere Thunderstorm WarningBOUDouglas, Jefferson43 min
Jul 12, 7:10 PM MDTSevere Thunderstorm WarningBOUArapahoe, Elbert50 min
Jul 12, 7:26 PM MDTTornado WarningBOUAdams, Arapahoe, Washington34 min
Jul 12, 7:50 PM MDTSevere Thunderstorm WarningBOUDouglas, Elbert40 min
Jul 12, 7:54 PM MDTSevere Thunderstorm WarningBOUArapahoe, Denver21 min
Jul 12, 7:54 PM MDTSevere Thunderstorm WarningBOUDouglas21 min
Jul 12, 8:13 PM MDTSevere Thunderstorm WarningBOUBoulder, Weld47 min
Jul 12, 8:20 PM MDTSevere Thunderstorm WarningBOUArapahoe, Douglas40 min
Jul 12, 8:50 PM MDTTornado WarningBOUAdams, Denver, Jefferson25 min
Jul 12, 8:50 PM MDTTornado WarningBOUBoulder25 min
Jul 12, 9:05 PM MDTTornado WarningBOUWeld25 min
Jul 12, 9:16 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver, Jefferson44 min
Jul 12, 9:19 PM MDTSevere Thunderstorm WarningBOUDouglas41 min
Jul 12, 9:29 PM MDTSevere Thunderstorm WarningBOUAdams, Weld31 min
Jul 12, 10:01 PM MDTSevere Thunderstorm WarningBOUDouglas, Elbert44 min
Jul 12, 10:06 PM MDTSevere Thunderstorm WarningBOUAdams, Weld24 min
Jul 12, 10:13 PM MDTFlash Flood WarningBOUJefferson, Park4 hr
Jul 13, 2:40 PM MDTSevere Thunderstorm WarningBOULarimer, Weld35 min
Jul 13, 3:12 PM MDTTornado WarningBOUWeld33 min
Jul 13, 3:40 PM MDTSevere Thunderstorm WarningBOULarimer, Weld35 min
Jul 13, 3:50 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln40 min
Jul 13, 4:10 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Washington35 min
Jul 13, 4:10 PM MDTSevere Thunderstorm WarningBOULincoln35 min
Jul 13, 4:11 PM MDTTornado WarningBOUMorgan, Washington34 min
Jul 13, 4:24 PM MDTTornado WarningBOUElbert, Lincoln21 min
Jul 13, 4:30 PM MDTSevere Thunderstorm WarningBOUAdams, Denver45 min
Jul 13, 4:30 PM MDTSevere Thunderstorm WarningBOUWeld45 min
Jul 13, 4:50 PM MDTTornado WarningBOUWashington25 min
Jul 13, 5:00 PM MDTTornado WarningBOUAdams, Arapahoe30 min
Jul 13, 5:15 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Elbert45 min
Jul 13, 5:15 PM MDTSevere Thunderstorm WarningBOUWashington6 hr

Nearby

Flash Flood Warnings in Colorado, 1996Every flash flood warning in 1996

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.