Alert archive / Colorado / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 44, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 18, 1990, 7:30 PM MDT for Adams County, Arapahoe County, Colorado. It was in force for 45 min.
The area
The counties it named.
The facts
- Issued
- Aug 18, 1990, 7:30 PM MDT (01:30 UTC)
- Expired
- Aug 18, 1990, 8:15 PM MDT
- In force
- 45 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Adams County, CO, Arapahoe 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, 1.5 hours before the alert went out and 95 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
- 102 J/kg
- Mixed-layer CIN
- -125 J/kg
- Mixed-layer LCL
- 2194 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 5 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 190129
SVRDEN
COC005-001-190215-
BULLETIN...IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
730 PM MDT SAT AUG 18 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 815 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES OF NORTHEAST COLORADO:
NORTHWESTERN ARAPAHOE
SOUTHWESTERN ADAMS
INCLUDING THE FOLLOWING TOWNS/CITIES:
WATKINS AND NORTHEAST AURORA
AT 0725PM THE PUBLIC REPORTED A SEVERE THUNDERSTORM WITH 3/4 INCH
HAIL AND VERY STRONG WINDS AT MISSISSIPPI AND GUN CLUB ROAD IN NORTHEAST
AURORA.
THE STORM WAS MOVING EAST AT 15 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 3962 10448 3965 10476 3977 10477 3979 10446What 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 18, 3:44 PM MDT, 3 hours 46 minutes before
COZ011-182300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 340 PM MDT SATURDAY AUG 18 1990 ...THUNDERSTORMS IN THE FOOTHILLS WEST OF DENVER... AT 335PM THUNDERSTORMS HAD DEVELOPED ALONG THE FRONT RANGE IN THE FOOTHILLS. THESE THUNDERSTORMS ARE WEAKENING AS THEY ATTEMPT TO MOVE EASTWARD OUT OVER THE CITIES ALONG THE FRONT RANGE. SCATTERED THUNDERSTORMS COULD REACH THE DENVER METRO AREA THIS AFTERNOON AND EARLY EVENING. THE PRIMARY DANGER WITH THESE THUNDERSTORMS IS LIGHTNING. SCATTERED AREAS COULD GET 1/4 INCH OF RAIN WITH ISOLATED AREAS GETTING 1/2 INCH TO 1 INCH...MAINLY IN AND NEAR THE FOOTHILLS. PEA-SIZE HAIL IS ALSO POSSIBLE. MOVE INDOORS OR STAY IN YOUR VEHBICLE IF A THUNDERSTORM IS IN YOUR AREA. HOLZINGER
Special weather statement, Aug 18, 4:18 PM MDT, 3 hours 12 minutes before
COZ015>017-182315- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 415 PM MDT SATURDAY AUG 18 1990 ...THUNDERSTORMS IN SOUTHEAST COLORADO... AT 410PM THUNDERSTORMS WERE CONTINUING TO DEVELOP IN SOUTHEAST COLORADO. MOST THUNDERSTORMS WERE EAST OF LA JUNTA. THE STRONGEST THUNDERSTORM WAS LOCATED 9 MILES NORTHEAST OF BRISTOL IN PROWERS COUNTY...OR 25 MILES EAST NORTHEAST OF LAMAR...AND WAS MOVING TOWARD THE SOUTH AT 15 MPH. THUNDERSTORMS IN SOUTHEAST COLORADO THIS AFTERNOON AND EVENING HAVE THE POTENTIAL TO PRODUCE FREQUENT LIGHTNING...BRIEF HEAVY RAIN...SMALL HAIL ...AND STRONG GUSTY WINDS. TAKE SHELTER IF A THUNDERSTORM APPROACHES YOUR AREA. HOLZINGER
Special weather statement, Aug 18, 5:18 PM MDT, 2 hours 12 minutes before
COZ002-004-011-190100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 515 PM MDT SATURDAY AUG 18 1990 ...THUNDERSTORMS WEST OF DENVER WEAKENING AS THEY MOVE EASTWARD... AT 510PM THERE WERE SEVERAL THUNDERSTORMS IN THE FOOTHILLS AND MOUNTAINS WEST OF DENVER. THE STRONGEST THUNDERSTORM WAS NEAR JEFFERSON IN PARK COUNTY...50 MILES SOUTHWEST OF DENVER. ANOTHER THUNDERSTORM WAS BETWEEN BAILY AND CONIFER ALONG THE PARK AND JEFFERSON COUNTY LINE 30 MILES SOUTHWEST OF DENVER. BRIEF HEAVY RAIN...SMALL HAIL...FREQUENT LIGHTNING...AND GUSTY WINDS CAN BE EXPECTED IN THE MOUNTAINS AND FOOTHILLS WITH A FEW OF THE STRONGER THUNDERSTORMS. LOCALLY 1/2 INCH TO 1 INCH OF RAIN IS POSSIBLE. THUNDERSTORMS WERE MOVING SLOWLY TOWARD THE NORTHEAST AT 10 MPH. A FEW OF THE THUNDERSTORMS COULD REACH DENVER AND OTHER CITIES ALONG THE FRONT RANGE THROUGH THE EARLY EVENING HOURS. RAINFALL WOULD BE LIGHT ...LESS THAN 1/4 INCH. LIGHTNING IS THE MAIN DANGER WITH THESE STORMS. MOVE INDOORS OR STAY IN YOUR VEHICLE IF ONE OF THESE THUNDERSTORMS APPROACHES YOUR AREA. HOLZINGER
Special weather statement, Aug 18, 6:37 PM MDT, 53 minutes before
COZ002-004-011-190100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 635 PM MDT SATURDAY AUG 18 1990 ...THUNDERSTORMS DEVELOPING IN THE DENVER AREA... AT 630PM SCATTERED THUNDERSTORMS WERE DEVELOPING IN THE DENVER AREA. RAINFALL SHOULD BE LIGHT...GENERALLY LESS THAN 1/4 INCH. HOWEVER...A BRIEF HEAVY SHOWER PRODUCING 1/2 INCH OF RAIN IS POSSIBLE...NOT ENOUGH TO CAUSE ANY FLOODING. LIGHTNING IS THE MAIN DANGER WITH THESE THUNDERSTORMS. WINDS ASSOCIATED WITH THUNDERSTORMS COULD BE GUSTING TO BRIEFLY TO 40 MPH. FOR YOUR OWN SAFETY...EITHER STAY IN YOUR VEHICLE OR MOVE INDOORS IF THREATENING WEATHER IS IN YOUR AREA. THUNDERSTORMS SHOULD BE DECREASING AGAIN BY 8PM...ENDIN5G LATER THIS EVENING. HOLZINGER
Special weather statement, Aug 18, 6:56 PM MDT, 34 minutes before
COZ011-190130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 655 PM MDT SATURDAY AUG 18 1990 ...HEAVY RAIN DEVELOPING IN THE DENVER AREA... AT 650PM THUNDERSTORMS HAD DEVELOPED OVER THE CITY OF DENVER. REPORTS WERE BEING RECEIVED FROM THE CHERRY CREEK SHOPPING CENTER OF HEAVY RAIN AND MARBLE SIZED HAIL. THESE THUNDERSTORMS WERE MOVING SLOWLY TOWARD THE EAST AT 10 MPH. RAINFALL COULD REACH THE 1 TO 2 INCH RANGE IN EASTERN DENVER AND THE EASTERN DENVER METRO AREA INCLUDING AURORA. THE WEST SIDE OF THE METRO AREA IS LESS LIKELY TO GET HEAVY RAIN. IN ADDITION TO THE HEAVY RAIN...SMALL HAIL...STRONG GUSTY WINDS...AND FREQUENT LIGHTNING ARE EXPECTED. THUNDERSTORMS SHOUL^D BE DECREASING AFTER 8PM THIS EVENING. MOVE TO A PLACE OF SAFETY IF THUNDERSTORMS ARE IN YOUR AREA. HOLZINGER
Special weather statement, Aug 18, 7:21 PM MDT, 9 minutes before
COZ011-190145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 720 PM MDT SATURDAY AUG 18 1990 ...HEAVY RAIN IN THE DENVER AREA... AT 715PM THUNDERSTORMS WERE PRODUCING HEAVY RAIN OVER THE CITY OF DENVER...NORTHEAST AURORA...AND THE SOUTHERN SUBURBS. A FEW AREAS ACROSS THE CENTRAL...EASTERN...AND SOUTHERN METRO DISTRICTS COULD GET 1 TO 2 INCHES OF RAIN CAUSING AREAS OF STREET FLOODING. SMALL HAIL IS ALSO POSSIBLE ALONG WITH GUSTY WINDS AND FREQUENT LIGHTNING. THUNDERSTORMS SHOULD BE DECREASING AFTER 8PM THIS EVENING. MOVE TO A PLACE OF SAFETY IF THUNDERSTORMS ARE IN YOUR AREA. HOLZINGER
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.