Alert archive / Colorado / Flash Flood Warnings in 1996

Flash Flood Warning 1, NWS Denver/Boulder, CO

July 12, 1996Jefferson County, Park County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Jul 12, 1996, 10:13 PM MDT for Jefferson County, Park County, Colorado. It was in force for 4 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 12, 1996, 10:13 PM MDT (04:13 UTC)
Expired
Jul 13, 1996, 2:15 AM MDT
In force
4 hr
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Jefferson County, CO, Park County, CO

The radar

The Denver radar (KFTG), 94 km from the middle of the area, began a volume at 04:17 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 00:00Z, 4.2 hours before the alert went out and 201 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°0°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 130420
FFWDEN
COC093-059-130815-

BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
1013 PM MDT FRI JUL 12 1996

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A FLASH FLOOD
WARNING EFFECTIVE UNTIL 215 AM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES

IN CENTRAL COLORADO
     NORTHEASTERN PARK

IN NORTHEASTERN COLORADO
     SOUTHERN JEFFERSON

INCLUDING THE FOLLOWING LOCATIONS
     BAILEY...BUFFALO CREEK...GLENISLE...HIGHLAND PARK...PINE...
     SHAFFERS CROSSING...SOUTH PLATTE AND WELLINGTON LAKE

AT 1013 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN 3 MILES SOUTHWEST OF PINE ...OR ABOUT 34 MILES
SOUTHWEST OF DENVER.  THE RAIN IS FALLING ON THE BURNED AREA OF
BUFFALO CREEK AND PEOPLE ARE BEING EVACUATED FROM THE AREA.

FLOODING IS LIKELY TO OCCUR ALONG THE NORTH FORK OF THE SOUTH PLATTE
RIVER...BUFFALO CREEK...AND DEER CREEK DOWNSTREAM TO CHATFIELD
RESERVOIR.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF
SMALL CREEKS AND STREAMS...LOW LYING AREAS...HIGHWAYS...ROADS...AND
UNDERPASSES.

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.


LAT...LON 3918 10530 3928 10552 3950 10553 3940 10513

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, 5:27 PM MDT, 4 hours 46 minutes before
COZ038-130030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
525 PM MDT   FRIDAY   JULY 12 1996

...THUNDERSTORM APPROACHING PAWNEE GRASSLANDS...

RADAR INDICATES THAT A STRONG THUNDERSTORM HAS MOVED ACROSS THE
WYOMING BORDER INTO NORTHWEST WELD COUNTY.  THE THUNDERSTORM WAS
LOCATED 5 MILES NORTH OF ROCKPOR COLORADO OR ABOUT 25 MILES SOUTH
OF CHEYENNE WYOMIONG AT 525 PM MDT.  IT WAS MOVING TO THE SOUTHEAST
ABOUT 20 MPH AND WILL MOVE INTO THE PAWNEE GRASSLANDS BETWEEN 6 AND 630
PM MDT.

IF YOU ARE IN THE OPEN SEEK SHELTER IF THIS THUNDERSTORM APPROACHES.
IT MAY CONTAIN MARBLE OR LARGER SIZE HAIL ALONG WITH MODERATE TO HEAVY
RAIN AND DEADLY LIGHTNING.  WIND GUSTS TO 40 OR 50 MPH ARE ALSO POSSIBLE
WITH THIS THUNDERSTORM.  MOTORISTS DRIVING ALONG HIGHWAY 85 FROM NUNN
NORTH TO THE WYOMING BORDER SHOULD BE ALERT FOR WATER PONDING ON
ROADWAYS ESPECIALLY IN LOW LYING AREAS.

A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF EASTERN COLORADO UNTIL 8
PM MDT.

END...GCF...WSFO DENVER
Special weather statement, Jul 12, 7:20 PM MDT, 2 hours 53 minutes before
COZ042-043-130145-

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

...THUNDERSTORM IN CENTRAL WELD COUNTY...

AT 710 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
THUNDERSTORM 3 MILES EAST OF GILL...OR ABOUT 12 MILES EAST OF
GREELEY.  HAMD RADIO SPOTTERS REPORT PEA SIZE HAIL AND HEAVY RAIN
WITH LOCAL STREET FLOODING FROM THIS THUNDERSTORM.

THE STORM WAS MOVING NORTHEAST AT 35 MILES PER HOUR.

PERSONS IN OR NEAR BARNESVILLE...BRIGGSDALE...GALETON...GILL...
KERSEY...PURCELL AND RIVERSIDE RESERVOIR SHOULD BE ON THE LOOKOUT
FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER
APPROACHES.

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.

A TORNADO 2WATCH REMAINS IN EFFECT FOR MUCH OF EASTERN COLORADO UNTIL
MIDNIGHT.

END...BOODA...WSFO DENVER
Special weather statement, Jul 12, 8:31 PM MDT, 1 hour 42 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

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 13, 2:30 AM MDTFlash Flood WarningBOUJefferson3 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; radar from the NEXRAD Level II archive.