Alert archive / Colorado / Tornado Warnings in 1988

Tornado Warning 22, NWS Denver/Boulder, CO

July 9, 1988Arapahoe County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jul 9, 1988, 8:12 PM MDT for Arapahoe County, Colorado. It was in force for 13 min.

The area

The counties it named.

The facts

Issued
Jul 9, 1988, 8:12 PM MDT (02:12 UTC)
Expired
Jul 9, 1988, 8:25 PM MDT
In force
13 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

County 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, 2.2 hours before the alert went out and 98 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 1988-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 358 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 1988-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.193958Sfc1 km3 km6 km9 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
358 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
2116 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
17 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDEN 100216
TORDEN
COC005-100240-
 
BULLETIN...EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
812 PM MDT SAT JUL 09 1988
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 840 PM  MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES OF NORTHEAST COLORADO:
 
     NORTH CENTRAL ARAPAHOE
 
INCLUDING THE FOLLOWING TOWNS/CITIES:
 
     NEAR INTERSTATE 70 AND MANILLA ROAD NEAR BENNET
 
THE STORM WAS LOCATED 27 MILES EAST OF DENVER.
 
AT 811 A TORNADO WAS SIGHTED AND RADAR CONFIRMS THE TORNADO.
 
IN HOMES GO TO THE BASEMENT OR INTO A CLOSET OR BATHROOM.
IN SCHOOLS..HIGH RISES AND HOSPITALS GO TO AN INTERIOR
HALLWAY ON THE LOWEST FLOOR.  IF IN MOBILE HOMES OR VEHICLES..
EVACUATE THEM AND GO TO A SUBSTANTIAL SHELTER.  IF NO SHELTER
IS AVAILABLE..LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT.
IN ALL CASES..STAY AWAY FROM WINDOWS..DOORS AND OUTSIDE WALLS.
 
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.
 
DUNN
 
LAT..LON  3973 10466 3975 10440 3964 10441 3963 10468

What 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, Jul 9, 2:30 PM MDT, 5 hours 42 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
130 PM MDT SAT JUL 9 1988

...TORNADO WATCH FOR MOST OF EASTERN COLORADO TIL 800 PM THIS EVENING...

RADAR INDICATED SHOWERS AND THUNDERTORMS CONTINUING OVER THE FOOTHILLS
SOUTHWEST OF DENVER NORTH TO THE WYOMING BORDER.  THUNDERSTORMS WERE
BEGINNING TO DEVELOP IN NORTHERN MORGAN COUNTY AND EASTERN WELD COUNTY
45 TO 65 MILES SOUTHWEST OF STERLING. THE STORMS WERE MOVING TO THE
SOUTHEAST AT 20 MPH.  OTHER THUNDERSTORMS ARE LIKELY OVER THE EASTERN
PLAINS OF COLORADO LATER THIS AFTERNOON AND EVENING.

DANGEROUS LIGHTNING...HAIL...BRIEF HEAVY RAIN AND STRONG GUSTY WINDS
ARE LIKELY WITH SOME OF THESE STORMS.

TWO TO THREE INCHES OF HAIL ON THE GROUND WITH THE HAIL SIZE UP TO 3/4
OF AND INCH AND ABOUT ONE INCH OF RAIN WAS REPORTED BY THE PUBLIC IN
IDAHO SPRINGS ABOUT 30 MILES TO THE WEST OF DENVER.
IF THREATENING WEATHER IS OBSERVED MOVE QUICKLY TO A PLACE OF SAFETY.
IoF NEAR A STREAM AND WATERS BEGIN TO RISE RAPIDLY MOVE QUICKLY TO HIGH
GROUND.

BALINT
Special weather statement, Jul 9, 4:47 PM MDT, 3 hours 25 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
445 PM MDT SAT JUL 9 1988

      ...TORNADO WATCH CANCELLED NORTH OF PALMER DIVIDE...

THE TORNADO WATCH HAS BEEN CANCELLED NORTH OF THE PALMER DIVIDE...THIS
INCLUDES THE DENVER METRO AREA. THE WATCH IS STILL IN EFFECT FROM THE
PALMER DIVIDE SOUTH TO THE ARKANSAS RIVER.

THUNDERSTORMS ARE STILL EXPECTED OVER MUCH OF NORTHEAST COLORADO
TONIGHT. AT 445 PM THE STRONGEST STORMS WERE LOCATEDa OVER NORTHERN WELD
COUNTY  BETWEEN GREELEY AND NUNN. VERY SLOW MOVEMENT WITH THESE STORMS
WILL RESULT IN LOCALLY HEAVY RAINS WITH 1 TO 2 INCHES IN LESS THAN AN
HOUR LIKELY.

DUNN
Special weather statement, Jul 9, 5:25 PM MDT, 2 hours 47 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
520 PM MDT SAT JUL 9 1988

      ...TORNADO WATCH CANCELLED FOR ALL OF COLORADO...

THE TORNADO WATCH HAS BEEN CANCELLED FOR THE REMAINDER OF COLORADO. A
FEW STRONG THUNDERSTORMS ARE LIKELY THIS EVENING THROUGHOUT EASTERN
COLORADO BUT IT NO LONGER APPEARS THAT SEVERE WEATHER WILL OCCUR.

THE STORMS WILL BE SLOW MOVING AND LOCALLY HEAVY RAIN IS POSSIBLE AS
WELL AS SMALL HAIL AND STRONG WINDS. THE SKIES WILL BEGIN CLEARING LATER
TONIGHT.

DUNN
Special weather statement, Jul 9, 7:48 PM MDT, 24 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
745 PM MDT SAT JUL 9 1988

  ...STRONG THUNDERSTORM MOVING THROUGH AURORA...

A STRONG THUNDERSTORM IS MOVING SOUTH THROUGH AURORA WITH HEAVY RAIN AND
SMALL HAIL. THERE HAVE BEEN REPORTS OF MARBLE SIZED HAIL. RADAR
INDICATES RAINFALL AMOUNTS BETWEEN 1/2 AND 1 INCH IN LESS THAN AN HOUR
WITH THIS STORM. SOME PARTS OF AURORA RECEIVED ABOUT AN INCH OF RAIN
EARLIER THIS EVENING FROM A PREVIOUS STORM AND THE ADDITION OF MORE
WATER WILL CAUSE FLOODING OF LOW LYING AREAS AND SOME INTERSECTIONS.
MOTORISTS SHOULD USE CAUTION OVER THE NEXT COUPLE OF HOURS AND BE
PREPARED FOR LOCAL STREET FLOODING. DO NOT DRIVE INTO WATER IF YOU
CANNOT DETERMaINE THE DEPTH.

DUNN

Nearby

Tornado Warnings in Colorado, 1988Every tornado warning in 1988Tornadoes in 1988

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.