Alert archive / Colorado / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 119, NWS Denver/Boulder, CO

August 11, 1994Adams County, Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 11, 1994, 4:22 PM MDT for Adams County, Weld County, Colorado. It was in force for 38 min.

The area

The counties it named.

The facts

Issued: Aug 11, 1994, 4:22 PM MDT (22:22 UTC)
Expired: Aug 11, 1994, 5:00 PM MDT
In force: 38 min
Issued by: NWS Denver/Boulder, CO
Area: Whole counties

Counties Adams County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 50 km from the middle of the area, began a volume at 22:22 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, 10.4 hours before the alert went out and 173 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 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

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm 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, 1:28 PM MDT, 2 hours 54 minutes before

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Special weather statement, Aug 11, 1:30 PM MDT, 2 hours 52 minutes before

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Special weather statement, Aug 11, 2:46 PM MDT, 1 hour 36 minutes before

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Special weather statement, Aug 11, 2:50 PM MDT, 1 hour 32 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, 52 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 10506

Special weather statement, Aug 11, 3:33 PM MDT, 49 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 10506

The 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, 5:16 PM MDT	Severe Thunderstorm Warning	BOU	Boulder, Jefferson	44 min
Aug 11, 5:38 PM MDT	Tornado Warning	BOU	Adams, Jefferson	22 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1994 Every severe thunderstorm warning 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.