Alert archive / Colorado / Tornado Warnings in 1994
Tornado Warning 15, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Aug 11, 1994, 5:38 PM MDT for Adams County, Jefferson County, Colorado. It was in force for 22 min.
The area
The counties it named.
The facts
- Issued
- Aug 11, 1994, 5:38 PM MDT (23:38 UTC)
- Expired
- Aug 11, 1994, 6:00 PM MDT
- In force
- 22 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Adams County, CO, Jefferson County, CO
The radar
The Denver radar (KFTG), 22 km from the middle of the area, began a volume at 23:38 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
Fort Carson/Butt, CO (KFCS), launched 12:00Z, 11.6 hours before the alert went out and 117 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
- 46 J/kg
- Mixed-layer CIN
- -163 J/kg
- Mixed-layer LCL
- 1383 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 112340
TORDEN
COC001-059-120000-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
538 PM MDT THU AUG 11 1994
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A TORNADO
WARNING EFFECTIVE UNTIL 600 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN NORTHEASTERN COLORADO
EXTREME WEST CENTRAL ADAMS AND NORTHEASTERN JEFFERSON
INCLUDING THE FOLLOWING LOCATIONS
ARVADA...NORTHGLENN...ROCKY FLATS...THORNTON AND
WESTMINSTER
AT 538 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A POSSIBLE TORNADO 4 MILES NORTHWEST OF ARVADA ...OR ABOUT 15
MILES NORTHWEST OF DENVER.
AMATEUR RADIO WEATHER SPOTTERS REPORTED A TORNADO
A FUNNEL CLOUD WAS LOCATED OVER STANDLEY LAKE.
THE STORM WAS MOVING TO THE SOUTHEAST AT 10 TO 15 MPH.
THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET
UNDER A WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO
BASEMENT IS AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE
BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE
BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY
FROM WINDOWS.
IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN
THE NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH
YOUR HANDS.
TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
FORECAST OFFICE IN dDENVER.
GARD...WSFO DENVER
LAT...LON 3980 10497 3984 10519 3995 10519 3992 10493What forecasters said that day
The local office's own words before this tornado 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, Aug 11, 2:50 PM MDT, 2 hours 48 minutes before
COZ036-037-112130- SPECIAL WEATHER STATEMENT...CORRECTED TIME... NATIONAL WEATHER SERVICE DENVER CO 250 PM MDT THU AUG 11 1994 AT 238 PM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA OF THUNDERSTORMS INCREASING ACROSS NORTHERN PARK INTO SOUTHERN JEFFERSON COUNTIES. THESE STORMS WERE MOVING EAST AT 15 MPH. RESIDENTS OF THE TOWNS OF GRANT...BAILEY...HIGHLAND PARK... GLENELK...DECKERS...AND CONIFER SHOULD CONTINUE MONITORING THE WEATHER THIS AFTERNOON. THUNDERSTORMS WILL CONTINUE TO DROP HEAVY RAIN AND SAMLL HAIL. SOME LOCAL FLOODING WILL BE POSSIBLE. REPORT ANY SEVERE WEATHER OR FLOODING TO YOUR LOCAL LAW ENFORCEMENT OFFICIALS TO BE PASSED ON THE THE NATIONAL WEATHER SERVICE. RTG LAT...LON 3925 10487 3925 10532 3949 10528 3949 10485
Special weather statement, Aug 11, 3:30 PM MDT, 2 hours 8 minutes before
COZ036-040-112230-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
330 PM MDT THU AUG 11 1994
...STRONG THUNDERSTORM OVER NORTHERN JEFFERSON COUNTY...
AT 326 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A STRONG THUNDERSTORM 5 MILES WEST OF WHITE RANCH OPEN SPACE ...OR
ABOUT 25 MILES WEST OF DENVER. THE STORM WAS MOVING TO THE EAST
AT 10 MPH.
ALL PEOPLE IN THE NORTHERN JEFFERSON COUNTY PORTION OF METRO
DENVER...INCLUDING THE FOLLOWING LOCATIONS
ARVADA...EDGEWATER...GOLDEN...LAKEWOOD...LEYDEN...MOUNTAIN
VIEW...PLEASANT VIEW...ROCKY FLATS...WESTMINSTER...WHEAT
RIDGE AND WHITE RANCH OPEN SPACE
SHOULD BE ALERT FOR HEAVY RAIN...FREQUENT DANGEROUS LIGHTNING...
SMALL HAIL AND STRONG GUSTY WINDS.
HEAVY RAIN MAY CAUSE STREET AND ROAD FLOODING.
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...INCLUDING LENA GULCH...THEREFORE SEEK HIGHER
GROUND IF THREATENED BY FLOOD WATERS.
GARD...WSFO DENVER
LAT...LON 3972 10507 3971 10539 3990 10538 3991 10506Special weather statement, Aug 11, 3:33 PM MDT, 2 hours 5 minutes before
COZ036-040-112230-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
330 PM MDT THU AUG 11 1994
...STRONG THUNDERSTORM OVER NORTHERN JEFFERSON COUNTY...
AT 326 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A STRONG THUNDERSTORM 5 MILES WEST OF WHITE RANCH OPEN SPACE ...OR
ABOUT 25 MILES WEST OF DENVER. THE STORM WAS MOVING TO THE EAST
AT 10 MPH.
ALL PEOPLE IN THE NORTHERN JEFFERSON COUNTY PORTION OF METRO
DENVER...INCLUDING THE FOLLOWING LOCATIONS
ARVADA...EDGEWATER...GOLDEN...LAKEWOOD...LEYDEN...MOUNTAIN
VIEW...PLEASANT VIEW...ROCKY FLATS...WESTMINSTER...WHEAT
RIDGE AND WHITE RANCH OPEN SPACE
SHOULD BE ALERT FOR HEAVY RAIN...FREQUENT DANGEROUS LIGHTNING...
SMALL HAIL AND STRONG GUSTY WINDS.
HEAVY RAIN MAY CAUSE STREET AND ROAD FLOODING.
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...INCLUDING LENA GULCH...THEREFORE SEEK HIGHER
GROUND IF THREATENED BY FLOOD WATERS.
GARD...WSFO DENVER
LAT...LON 3972 10507 3971 10539 3990 10538 3991 10506Special weather statement, Aug 11, 4:34 PM MDT, 1 hour 4 minutes before
COZ035-039-112330-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
434 PM MDT THU AUG 11 1994
...STRONG THUNDERSTORM OVER BOULDER COUNTY...
AT 434 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A THUNDERSTORM OVER JAMESTOWN ...OR ABOUT 37 MILES SOUTHWEST OF
FORT COLLINS.
ALL PEOPLE IN BOULDER COUNTY INCLUDING THE FOLLOWING LOCATIONS
BOULDER...ERIE...GOLD HILL...JAMESTOWN...LONGMONT...NIWOT
AND RAYMOND
SHOULD BE ALERT FOR HEAVY RAIN...FREQUENT DANGEROUS LIGHTNING...HAIL
AND STRONG GUSTY WINDS TIL 530 PM MDT THIS AFTERNOON.
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 SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR NORTH
CENTRAL...NORTHEASTERN AND EAST CENTRAL COLORADO UNTIL 1000PM
MDT.
GARD...WSFO DENVER
LAT...LON 4000 10507 4004 10547 4015 10547 4023 10507Special weather statement, Aug 11, 4:37 PM MDT, 1 hour 1 minute before
COZ035-039-112330-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
434 PM MDT THU AUG 11 1994
...STRONG THUNDERSTORM OVER BOULDER COUNTY...
AT 434 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A THUNDERSTORM OVER JAMESTOWN ...OR ABOUT 37 MILES SOUTHWEST OF
FORT COLLINS.
ALL PEOPLE IN BOULDER COUNTY INCLUDING THE FOLLOWING LOCATIONS
BOULDER...ERIE...GOLD HILL...JAMESTOWN...LONGMONT...NIWOT
AND RAYMOND
SHOULD BE ALERT FOR HEAVY RAIN...FREQUENT DANGEROUS LIGHTNING...HAIL
AND STRONG GUSTY WINDS TIL 530 PM MDT THIS AFTERNOON.
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 SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR NORTH
CENTRAL...NORTHEASTERN AND EAST CENTRAL COLORADO UNTIL 1000PM
MDT.
GARD...WSFO DENVER
LAT...LON 4000 10507 4004 10547 4015 10547 4023 10507Special weather statement, Aug 11, 4:42 PM MDT, 56 minutes before
COZ036-040-112345-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
445PM MDT THU AUG 11 1994
...STRONG THUNDERSTORMS OVER NORTHERN JEFFERSON COUNTY...
AT 438 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A THUNDERSTORM 3 MILES NORTH OF BERGEN PARK ...OR ABOUT 24
MILES WEST OF DENVER. THE STORM WAS MOVING TO THE EAST AT
10 MPH.
ALL PEOPLE IN NORTHERN JEFFERSON COUNTY INCLUDING THE FOLLOWING
LOCATIONS
ARVADA...BERGEN PARK...EDGEWATER...GOLDEN...IDLEDALE...
KITTREDGE...LAKEWOOD...LEYDEN...MORRISON...PLEASANT VIEW...
RED ROCKS PARK...WESTMINSTER...WHEAT RIDGE AND WHITE RANCH
OPEN SPACE
SHOULD BE ALERT FOR HEAVY RAIN...HAIL...FREQUENT DANGEROUS LIGHTNING
AND STRONG GUSTY WINDS UNTIL 545 PM MDT THIS AFTERNOON.
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...INCLUDING
LENA GULCH...AND RIVERS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF
THREATENED BY FLOOD WATERS.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR NORTH
CENTRAL...NORTHEASTERN AND EAST CENTRAL COLORADO UNTIL 1000PM
MDT.
GARD...WSFO DENVER
LAT...LON 3961 10511 3967 10538 3981 10539 3989 10506The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 10:08 PM MDT | Severe Thunderstorm Warning | BOU | Larimer | 37 min |
| Aug 11, 1:35 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 25 min |
| Aug 11, 4:22 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 38 min |
| Aug 11, 5:16 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Jefferson | 44 min |
Nearby
Tornado Warnings in Colorado, 1994Every tornado warning in 1994Tornadoes in 1994
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.