Alert archive / Colorado / Tornado Warnings in 1991
Tornado Warning 37, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 10, 1991, 3:28 PM MDT for Douglas County, Colorado. It was in force for 47 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
- Jun 10, 1991, 3:28 PM MDT (21:28 UTC)
- Expired
- Jun 10, 1991, 4:15 PM MDT
- In force
- 47 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Douglas County, CO
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 10, 3:52 PM MDT | Tornado F0 | Douglas, 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
Fort Carson/Butt, CO (KFCS), launched 12:00Z, 9.5 hours before the alert went out and 75 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1843 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -39 m²/s²
- 0-3 km storm-relative helicity
- -21 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 102128
TORDEN
COC035-102215-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
328 PM MDT MON JUN 10 1991
THE NATIONAL WEATHER SERVICE IN DENVER HAS REISSUED A TORNADO
WARNING EFFECTIVE NOW UNTIL 415 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN NORTHEASTERN COLORADO
DOUGLAS
INCLUDING THE FOLLOWING TOWNS/CITIES
CASTLE ROCK...FRANKTOWN AND LARKSPUR
AT 328 PM MDT RADAR WAS STILL INDICATING A POSSIBLE TORNADO 3 MILES
NORTHEAST OF LARKSPUR ...OR ABOUT 35 MILES SOUTH OF DENVER.
THE STORM PRODUCING THE TORNADO WAS MOVING VERY SLOWLY TO THE SOUTHEAST.
THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET
UNDER A WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO
BASEMENT IS AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE
BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE
BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY FROM
WINDOWS.
IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN
THE NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH
YOUR HANDS.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR MOST OF EASTERN
COLORADO TIL 900 PM MDT.
TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
FORECAST OFFICE IN DENVER.
MCQUEEN
LAT...LON 3914 10466 3914 10509 3941 10495 3947 10467What forecasters said that day
The local office's own words before this tornado 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 10, 1:09 PM MDT, 2 hours 19 minutes before
COZ011-102100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 110 PM MDT JUN 10 1991 ...STRONG THUNDERSTORMS BUILDING OVER FOOTHILLS WEST OF DENVER... AT 100 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED STRONG THUNDERSTORMS DEVELOPING OVER THE FOOTHILLS 30 MILES WEST OF DENVER. THE STRONGEST STORM WAS LOCATED 10 MILES SOUTHWEST OF EVERGREEN. THESE STORMS WERE MOVING SLOWLY TO THE EAST AT 10 TO 15 MPH. ALL PEOPLE IN EASTERN CLEAR CREEK AND WEST CENTRAL JEFFERSON COUNTIES... INCLUDING EVERGREEN AND CONIFER SHOULD BE ALERT FOR DANGEROUS FREQUENT LIGHTNING...HAIL AND STRONG GUSTY WINDS FROM THESE STORMS UNTIL 230 PM MDT THIS AFTERNOON. HEAVY RAIN MAY PRODUCE LOCAL FLOODING OF HIGHWAYS...NORMALLY DRY GULCHES AND LOW LYING OR FLOOD PRONE AREAS. DRIVERS SHOULD BE ALERT FOR MUD AND ROCK SLIDES IN FOOTHILLS CANYONS. STAY TUNED TO NATIONAL WEATHER SERVICE RADIO AND OTHER MASS MEDIA COMMUNICATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS. GARD...WSFO DENVER
Special weather statement, Jun 10, 1:59 PM MDT, 1 hour 29 minutes before
COZ011-102200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 2PM MDT JUN 10 1991 ...THUNDERSTORMS CONTINUE TO BUILD ALONG FRONT RANGE... AT 2PM THUNDERSTORMS CONTINUED TO BUILD ALONG THE FRONT RANGE FROM SOUTHERN LARIMER COUNTY TO SOUTHERN JEFFERSON COUNTY AND MOVE TOWARD THE EAST SOUTHEAST AT AROUND 15 MILES AN HOUR. SMALL HAIL AND STRONG WINDS HAVE BEEN REPORTED WITH THESE STORMS AND LIGHTNING STARTED A FIRE NEAR CONIFER. CURRENT INDICATIONS ARE THAT ONE OR TWO OF THESE STORMS COULD PRODUCE UP TO AN INCH OF RAIN IN AN HOUR AS THEY MOVE ACROSS THE DENVER METROPOLITAN AREA DURING THE NEXT SEVERAL HOURS BUT NOTHING MORE THAN LOCALIZED STREET FLOODING IS ANTICIPATED AT THE_ PRESENT TIME...ALTHOUGH SMALL HAIL AND LOCALLY STRONG WINDS SHOULD BE EXPECTED WITH THE STORMS. FURTHER STATEMENTS WILL BE ISSUED AS CONDITIONS REQUIRE. LET
Special weather statement, Jun 10, 2:39 PM MDT, 49 minutes before
COZ011-102200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 240 PM MDT MON JUN 10 1991 ...SEVERE THUNDERSTORM WATCH IN EFFECT TIL 900 PM MDT FOR THE FRONT RANGE...NORTHEAST PLAINS...AND PALMER DIVIDE... ...VERY STRONG THUNDERSTORM NEAR RUSTIC IN WESTERN LARIMER COUNTY... AT 240 PM MDT RADAR WAS SHOWING A VERY STRONG THUNDERSTORM ABOUT 8 MILES NORTHWEST OF RUSTIC IN WESTERN LARIMER COUNTY...OR ABOUT 35 MILES WEST- NORTHWEST OF FORT COLLINS. AN INTENSE THUNDERSTORM WAS ALSO OVER EXTREME SOUTHERN JEFFERSON COUNTY AND SOUTHWESTERN DOUGLAS COUNTY NEAR DECKERS. NEW THUNDERSTORMS WERE ALSO DEVELOPING OVER NORTH-CENTRAL WELD COUNTY. THUNDERSTORMS WERE MOVING TO THE EAST-SOUTHEAST AT 10 MPH AND APPEAR TO HAVE CONSIDERABLE POTENTIAL FOR BOTH HAIL AND HEAVY RAIN. KEEP LISTENING FOR LATER STATEMENTS OR WARNINGS. MCQUEEN
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 10, 2:44 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 46 min |
| Jun 10, 2:53 PM MDT | Tornado Warning | BOU | Douglas | 37 min |
Nearby
Tornado Warnings in Colorado, 1991Every tornado warning in 1991Tornadoes in 1991
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.