Alert archive / Colorado / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 48, NWS Denver/Boulder, CO

August 19, 19904 counties in Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 19, 1990, 8:05 PM MDT for 4 counties in Colorado. It was in force for 40 min.

The area

The counties it named.

The facts

Issued
Aug 19, 1990, 8:05 PM MDT (02:05 UTC)
Expired
Aug 19, 1990, 8:45 PM MDT
In force
40 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Adams County, CO, Arapahoe County, CO, Morgan County, CO, Weld County, CO

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 2.1 hours before the alert went out and 88 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 1990-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 417 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 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 1990-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.1939Sfc1 km3 km6 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
417 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
2715 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
43 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDEN 200208
SVRDEN
COC041-005-001-087-123-200245-

BULLETIN...IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
805 PM MDT SUN AUG 19 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 845 PM  MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES OF NORTHEAST COLORADO:

     CENTRAL AND EASTERN ARAPAHOE
     CENTRAL AND EASTERN ADAMS

INCLUDING THE FOLLOWING TOWNS/CITIES:

     BRIGHTON..HENDERSON..BENNETT..BYERS..DEER TRAIL..AND STRASBURG

AT 0800 PM THE PUBLIC REPORTED GOLF BALL SIZE HAIL AT 120TH AND
BRIGHTON BLVD...15 MILES NORTHEAST OF DENVER.

THE STORM WAS MOVING TOWARD THE EAST AT 25 MPH.  RADAR SHOWED ANOTHER
SEVERE THUNDERSTORM OVER BENNET AT 8PM MOVING TOWARD THE EAST AT 25 MPH.

IF SEVERE WEATHER APPROACHES YOUR AREA...GO TO A STURDY
SHELTER AWAY FROM CREEK BEDS AND OTHER FLOOD PRONE AREAS.
REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING
HAIL...DAMAGING WINDS OF OVER 60 MPH...DEADLY LIGHTNING...AND
HEAVY RAINS THAT CAN QUICKLY FLOOD A LOW LYING AREA.

INTENSE LIGHTNING IS REPORTED WITH THIS STORM.  IF OUTDOORS...
STAY AWAY FROM HIGH OBJECTS.  MOVE INDOORS IF POSSIBLE.  WHEN
INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING
TELEPHONES AND ELECTRICAL EQUIPMENT.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE
IN DENVER...OR CALL YOUR REPORT TO THE NATIONAL ,WEATHER SERVICE
AT 361-0663.  DO NOT CALL THIS NUMBER FOR INFORMATION.

HOLZINGER

LAT...LON 3958 10386 3957 10450 4001 10470 4001 10384

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 19, 3:32 PM MDT, 4 hours 33 minutes before
COZ015>017-192230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
330 PM MDT SUNDAY AUG 19 1990

...THUNDERSTORMS DEVELOPING IN LAS ANIMAS COUNTY...

THUNDERSTORMS HAVE DEVELOPED AGAIN THIS AFTERNOON IN LAS ANIMAS COUNTY.
AT 325PM ONE THUNDERSTORM WAS JUST ABOUT OVER TRINIDAD...ANOTHER
THUNDERSTORM WAS 25 MILES EAST OF TRINIDAD...AND ANOTHER WAS 50 MILES
SOUTH OF LA JUNTA.  THE STORM NEAR TRINIDAD WAS MOVING TOWARD THE
NORTHEAST AT 20 MPH.  OTHER THUNDERSTORMS WERE NEAR STATIONARY.

THUNDERSTORMS IN SOUTHEASTERN COLORADO ARE LIKELY TO INCREASE AND SPREAD
TO OTHER AREAS DURING THE REST OF THIS AFTERNOON.

THESE THUNDERSTORMS CAN PRODUCE LOCALLY HEAVY RAIN...HAIL...STRONG GUSTY
WINDS...AND FREQUENT LIGHTNING.  MOVE TO A PLACE OF SAFETY IF A
THUNDERSTORM APPROACHES YOUR AREA.

HOLZINGER
Special weather statement, Aug 19, 4:19 PM MDT, 3 hours 46 minutes before
COZ011-192300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
415 PM MDT SUNDAY AUG 19 1990

...THUNDERSTORMS DEVELOPING IN THE DENVER AREA...

AT 410PM THUNDERSTORMS HAD DEVELOPED IN THE FOOTHILLS WEST OF DENVER
SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP EAST OF THE FOOTHILLS
IN THE DENVER METROPOLITAN AREA BY 6PM...WITH THE EASTERN AND SOUTHERN
SUBURBS MOST LIKELY TO GET THUNDERSTORMS.

MOISTURE IS MORE LIMITED TODAY THAN IT WAS SATURDAY AND RAINFALL SHOULD
NOT BE AS INTENSE.  HOWEVER...LOCALLY UP TO 1 INCH OF RAIN IS STILL
POSSIBLE.  MOST THUNDERSTORMS SHOULD RESULT IN LESS THAN 1/2 INCH OF
RAIN.  THE EASTERN AND SOUTHERN SUBURBS APPEAR TO BE MOST FAVORED FOR
THUNDERSTORM ACTIVITY THROUGH THE EARLY EVENING HOURS.

ASIDE FROM RAIN...FREQUENT LIGHTNING AND GUSTY WINDS CAN BE EXPECTED
WITH THUNDERSTORMS ALONG WITH THE POSSIBILITY OF SMALL HAIL.

MOVE INDOORS OR STAY IN YOUR VEHICLE IF A THUNDERSTORM IS IN YOUR AREA.

HOLZINGER
Special weather statement, Aug 19, 5:22 PM MDT, 2 hours 43 minutes before
COZ011-012-200000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
520 PM MDT SUNDAY AUG 19 1990

...THUNDERSTORMS CONTINUING TO DEVELOP OVER DENVER...

THUNDERSTORMS ARE CONTINUING TO DEVELOP IN THE DENVER AREA.  AT 515PM
A STRONG THUNDERSTORM WAS 5 MILES WEST OF GOLDEN.  THE STORM WAS MOVING
EAST AT 10 MPH AND IS LIKELY TO MOVE THROUGH GOLDEN BY 6PM.

ANOTHER THUNDERSTORM WAS DEVELOPING OVER LAKEWOOD.  AND ANOTHER WAS
DEVELOPING ALONG HIGHWAYS 76 AND 85 JUST SOUTH OF HENDERSON...10 MILES
NORTHEAST OF DENVER.  THESE THUNDERSTORMS WERE ALSO MOVING TOWARD THE
EAST AT 10 MPH.

THUNDERSTORMS ARE LIKELY OVER MOST OF THE DENVER METRO AREA UNTIL 7PM.
AFTER 7PM THUNDERSTORMS SHOULD BE DECREASING AND ENDING BY 9PM.

LOCALLY HEAVY RAIN IS POSSIBLE...UP TO 1 INCH OF RAIN.  MOST AREAS
SHOULD GET LESS THAN 1/2 INCH.  LOCAL STREET FLOODING COULD OCCUR WITH
THE STRONGEST THUNDERSTORMS.

ASIDE FROM RAIN...FREQUENT LIGHTNING AND GU STY WINDS CAN BE EXPECTED
WITH THUNDERSTORMS ALONG WITH THE POSSIBILITY OF SMALL HAIL.

MOVE INDOORS OR STAY IN YOUR VEHICLE IF A THUNDERSTORM IS IN YOUR AREA.

HOLZINGER
Special weather statement, Aug 19, 5:41 PM MDT, 2 hours 24 minutes before
COZ015>017-200100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
540 PM MDT SUNDAY AUG 19 1990

...THUNDERSTORMS IN THE SOUTHEAST...

AT 535PM SCATTERED THUNDERSTORMS HAD DEVELOPED IN THE SOUTHEAST...MAINLY
SOUTH OF A LINE THROUGH PUEBLO AND LAMAR.  ONE STRONG THUNDERSTORM WAS
10 MILES SOUTH OF SPRINGFIELD IN BACA COUNTY.  ANOTHER STRONG
THUNDERSTORM WAS IN EXTREME SOUTHEAST PUEBLO COUNTY...35 MILES SOUTHEAST
OF PUEBLO.

THE THUN3DERSTORMS WERE MOVING TOWARD THE EAST AT 10 MPH.  BRIEF HEAVY
RAIN...HAIL...STRONG GUSTY WINDS...AND FREQUENT LIGHTNING ARE POSSIBLE.
MOVE INDOORS OR STAY IN YOUR VEHICLE IF THUNDERSTORMS ARE IN YOUR AREA.

HOLZINGER
Special weather statement, Aug 19, 6:52 PM MDT, 1 hour 13 minutes before
COZ015>017-200200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
650 PM MDT SUNDAY AUG 19 1990

...SCATTERED THUNDERSTORMS CONTINUING IN THE SOUTHEAST...

SCATTERED THUNDERSTORMS ARE CONTINUING THIS EVENING IN THE SOUTHEAST.
AT 645PM RADAR SHOWED A LINE OF THUNDERSTORMS EXTENDED FROM EXTREME
NORTHWESTERN PUEBLO COUNTY...20 MILES NORTHWEST OF THE CITY OF
PUEBLO...TO NEAR LA JUNTA IN OTERO COUNTY.  ANOTHER LINE OF
THUNDERSTORMS EXTENDED IN A NORTHEAST TO SOUTHWEST LINE ACROSS
SOUTHEASTERN BACA COUNTY.

THUNDERSTORMS WERE MOVING TOWARD THE NORTHEAST AT 20 TO 25 MPH.  AT
625PM MARBLE SIZED HAIL WAS REPORTED JUST SOUTH OF PUEBLO.

THUNDERSTORMS IN THE SOUTHEAST COULD PRODUCE FREQUENT LIGHTNING...
STRONG WINDS...HAIL...AND BRIEF HEAVY RAIN.

IF A THUNDERSTORM APPROACHES YOUR AREA...MOVE INDOORS OR STAY IN YOUR
VEHICLE.

HOLZINGER

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 6:10 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver50 min
Aug 19, 6:10 PM MDTSevere Thunderstorm WarningBOUWeld50 min
Aug 19, 8:05 PM MDTSevere Thunderstorm WarningBOUEl Paso40 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1990Every severe thunderstorm warning in 1990

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.