Alert archive / Colorado / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 20, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 9, 1990, 5:19 PM MDT for Weld County, Colorado. It was in force for 41 min. 2 reports 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
- Jun 9, 1990, 5:19 PM MDT (23:19 UTC)
- Expired
- Jun 9, 1990, 6:00 PM MDT
- In force
- 41 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Weld 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 |
|---|---|---|---|
| Jun 9, 5:35 PM MDT | Hail 2 | Weld, CO | |
| Jun 9, 5:59 PM MDT | Tornado F0 | Weld, 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 12:00Z, 11.3 hours before the alert went out and 125 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
- 31 J/kg
- Mixed-layer CIN
- -456 J/kg
- Mixed-layer LCL
- 2000 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, Jun 9, 1:06 PM MDT, 4 hours 13 minutes before
COZ013-092100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 105 PM MDT SAT JUN 9 1990 ...STRONG THUNDERSTORMS DEVELOP OVER JEFFERSON COUNTY...POTENTIAL FOR STRONGER THUNDERSTORMS OVER THE METROPLEX... AT 100 PM MDT STRONG THUNDERSTORMS WERE DEVELOPING OVER CENTRAL AND WESTERN PARTS OF JEFFERSON COUNTY. A STRONG STORM WAS LOCATED IN WEST CENTRAL JEFFERSON COUNTY NEAR THE CITIES OF CONIFER...ASPEN PARK... AND EVERGREEN. ANOTHER STRONG STORM WAS LOCATED IN THE WESTERN PART OF THE METROPLEX NEAR WHEATRIDGE AND ARVADA. STRONG AND GUSTY WINDS AND HAIL ARE POSSIBLE FROM THESE THUNDERSTORMS AS THEY MOVE TO THE EAST-NORTHEAST AT 20 MPH. CONDITIONS EARLY THIS AFTERNOON WERE BECOMING MORE FAVORABLE FOR STRONGER THUNDERSTORMS FROM AROUND BRIGHTON...SOUTHWEST THROUGH AURORA...AND SOUTHWEST FROM THERE TO AROUND CASTLE ROCK. IN FACT... A BRIEF WEAK FUNNEL CLOUD WAS OBSERVED TO THE SOUTHWEST OF CASTLE ROCK AND TO THE WEST OF I-25 AT 1255 PM MDT BY THE DOUGLAS COUNTY SHERIFFS OFFICE. KEEP LISTENING FOR UPDATES ON THIS AFTERNOONS WEATHER.
Special weather statement, Jun 9, 1:09 PM MDT, 4 hours 10 minutes before
COZ013-092100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 105 PM MDT SAT JUN 9 1990 ...STRONG THUNDERSTORMS DEVELOP OVER JEFFERSON COUNTY...POTENTIAL FOR STRONGER THUNDERSTORMS OVER THE METROPLEX... AT 100 PM MDT STRONG THUNDERSTORMS WERE DEVELOPING OVER CENTRAL AND WESTERN PARTS OF JEFFERSON COUNTY. A STRONG STORM WAS LOCATED IN WEST CENTRAL JEFFERSON COUNTY NEAR THE CITIES OF CONIFER...ASPEN PARK... AND EVERGREEN. ANOTHER STRONG STORM WAS LOCATED IN THE WESTERN PART OF THE METROPLEX NEAR WHEATRIDGE AND ARVADA. STRONG AND GUSTY WINDS AND HAIL ARE POSSIBLE FROM THESE THUNDERSTORMS AS THEY MOVE TO THE EAST-NORTHEAST AT 20 MPH. CONDITIONS EARLY THIS AFTERNOON WERE BECOMING MORE FAVORABLE FOR STRONGER THUNDERSTORMS FROM AROUND BRIGHTON...SOUTHWEST THROUGH AURORA...AND SOUTHWEST FROM THERE TO AROUND CASTLE ROCK. IN FACT... A BRIEF WEAK FUNNEL CLOUD WAS OBSERVED TO THE SOUTHWEST OF CASTLE ROCK AND TO THE WEST OF I-25 AT 1255 PM MDT BY THE DOUGLAS COUNTY SHERIFFS OFFICE. KEEP LISTENING FOR UPDATES ON THIS AFTERNOONS WEATHER. MCQUEEN
Special weather statement, Jun 9, 2:07 PM MDT, 3 hours 12 minutes before
COZ013-092100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 205 PM MDT SAT JUN 9 1990 ...TORNADO WATCH MOST OF EASTERN COLORADO EFFECTIVE 2PM UNTIL 8 PM THIS EVENING... A TORNADO WATCH HAS BEEN ISSUED FOR MOST OF EASTERN COLORADO AND WILL BE IN EFFECT FROM 2 PM THIS AFTERNOON...UNTIL 8 PM THIS EVENING. TORNADOES ...LARGE HAIL...DANGEROUS LIGHTNING...PERIODS OF HEAVY RAIN...AND DAMAGING THUNDERSTORM WINDS CAN BE EXPECTED WITH THESE STORMS. STRONG THUNDERSTORMS CONTINUED TO DEVELOP IN THE MOIST UNSTABLE AIR OVER COLORADO THIS AFTERNOON. SATELLITE INDICATED THUNDERSTORMS OVER THE SOUTHERN AND CENTRAL MOUNTAINS AND EASTERN FOOTHILLS. THESE STORMS WER*E ON THE INCREASE AND WERE SLOWLY MOVING EAST. SO FAR...NO SEVERE WEATHER HAS BEEN REPORTED BUT ALL CONCERNED PERSONS SHOULD STAY TUNED TO NOAA WEATHER RADIO AND MEDIA OUTLETS FOR ADDITIONAL INFORMATION. JFR
Special weather statement, Jun 9, 2:41 PM MDT, 2 hours 38 minutes before
COZ013-092200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 240 PM MDT SAT JUN 9 1990 ...STRONG THUNDERSTORMS OVER DOUGLAS COUNTY... ...TORNADO WATCH MOST OF EASTERN COLORADO EFFECTIVE 2PM UNTIL 8 PM THIS EVENING... AT 240 PM MDT RADAR WAS SHOWING INTENSIFYING THUNDERSTORMS OVER DOUGLAS COUNTY. ONE STRONG THUNDERSTORM WAS ABOUT 5 MILES WEST OF CASTLE ROCK. ANOTHER STRONG THUNDERSTORMS WAS ABOUT 5 MILES WEST OF LARKSPUR. THESE THUNDERSTORMS WERE MOVING TO THE EAST-NORTHEAST AT 15 MPH. CENTRAL ARAPAHOE COUNTY AND THE SOUTHEAST HALF OF DOUGLAS COUNTY SHOULD RECEIVE THE STRONGEST THUNDERSTORMS DURING THE NEXT HOUR. THIS INCLUDES THE CITIES OF CASTLE ROCK...FRANKTOWN...BYERS...AND PARKER. THUS FAR THERE HAVE BEEN NO REPORTS OF SEVERE WEATHER RECEIVED BY THE DENVER OFFICE OF THE NATIONAL WEATHER SERVICE. HOWEVER...THUNDERSTORMS ACROSS EASTERN COLORADO THIS AFTERNOON AND EARLY EVENING HAVE POTExNTIAL TO PRODUCE VERY STRONG WINDS AND POSSIBLY TORNADOES...LARGE HAIL... FREQUENT LIGHTNING...AND HEAVY RAIN. KEEP LISTENING FOR LATER STATEMENTS OR POSSIBLE WARNINGS. MCQUEEN
Special weather statement, Jun 9, 4:43 PM MDT, 36 minutes before
COZ011-012-092345- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 445 PM MDT SAT JUN 9 1990 ...STRONG THUNDERSTORMS OVER EASTERN ARAPAHOE COUNTY...AND A NEW ONE IN WELD... AT 440 PM MDT RADAR INDICATED STRONG THUNDERSTORMS IN EASTERN ARAPAHOE COUNTY. THE STRONGEST STORM WAS JUST WEST OF DEER TRAIL...OR ABOUT 50 MILES EAST OF DENVER. THE STORMS WERE MOVING TOWARD THE EAST NORTHEAST AT ABOUT 15 MPH. ANOTHER THUNDERSTORM HAD JUST DEVELOPED RAPIDLY IN WELD COUNTY ABOUT FIVE MILES NORTH OF GREELEY...AND WAS MOVING SLOWLY TOWARD THE NORTH. THESE THUNDERSTORMS WILL PROBABLY PRODUCE LOCAL HEAVY RAIN...AS WELL AS HAIL...STRONG WINDS...AND FREQUENT LIGHTNIXNG. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR MOST OF EASTERN COLORADO UNTIL 8 PM MDT. MARKKANEN
Special weather statement, Jun 9, 4:45 PM MDT, 34 minutes before
COZ011-012-092345- SPECIAL WEATHER STATEMENT...CORRECTED FOR TORNADO WATCH NATIONAL WEATHER SERVICE DENVER CO 445 PM MDT SAT JUN 9 1990 ...STRONG THUNDERSTORMS OVER EASTERN ARAPAHOE COUNTY...AND A NEW ONE IN WELD... AT 440 PM MDT RADAR INDICATED STRONG THUNDERSTORMS IN EASTERN ARAPAHOE COUNTY. THE STRONGEST STORM WAS JUST WEST OF DEER TRAIL...OR ABOUT 50 MILES EAST OF DENVER. THE STORMS WERE MOVING TOWARD THE EAST NORTHEAST AT ABOUT 15 MPH. ANOTHER THUNDERSTORM HAD JUST DEVELOPED RAPIDLY IN WELD COUNTY ABOUT FIVE MILES NORTH OF GREELEY...AND WAS MOVING SLOWLY TOWARD THE NORTH. THESE THUNDERSTORMS WILL PROBABLY PRODUCE LOCAL HEAVY RAIN...AS WELL AS HAIL..._STRONG WINDS...AND FREQUENT LIGHTNING. A TORNADO WATCH REMAINS IN EFFECT FOR MOST OF EASTERN COLORADO UNTIL 8 PM MDT. MARKKANEN
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.