Alert archive / Colorado / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 45, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 19, 1990, 6:10 PM MDT for Adams County, Arapahoe County, Denver County, Colorado. It was in force for 50 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 19, 1990, 6:10 PM MDT (00:10 UTC)
- Expired
- Aug 19, 1990, 7:00 PM MDT
- In force
- 50 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Adams County, CO, Arapahoe County, CO, Denver County, CO
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 19, 6:29 PM MDT | Hail 1.5 | Adams, CO |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Denver, CO (KDEN), launched 00:00Z, 0.2 hours before the alert went out and 111 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
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 200014
SVRDEN
COC005-031-001-123-200100-
BULLETIN...IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
610 PM MDT SUN AUG 19 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 700 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES OF NORTHEAST COLORADO:
NORTHWESTERN ARAPAHOE
WESTERN ADAMS
EXTREME SOUTHWESTERN WELD
EXTREME EASTERN DENVER
INCLUDING THE FOLLOWING TOWNS/CITIES:
AURORA..BRIGHTON..COMMERCE CITY..EAST DENVER
FORT LUPTON..HUDSON..NORTHGLENN..THORNTON
AND WATKINS
AT 0605 PM MDT THE PUBLIC REPORTED A SEVERE THUNDERSTORM
OVER LOWRY AIR FORCE BASE IN EXTREME EASTERN DENVER.
THE STORM WAS MOVING TOWARD THE EAST AT 10 TO 15 MILES AN HOUR.
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.
CUOCO
LAT...LON 3963 10461 3968 10492 4011 10501 4012 10464What 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, 2 hours 38 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, 1 hour 51 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, 48 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, 29 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
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 6:10 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 50 min |
| Aug 19, 8:05 PM MDT | Severe Thunderstorm Warning | BOU | El Paso | 40 min |
| Aug 19, 8:05 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Morgan, Weld | 40 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.