Alert archive / Colorado / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 60, NWS Denver/Boulder, CO

June 15, 1997Larimer County, Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 15, 1997, 1:41 PM MDT for Larimer County, Weld County, Colorado. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Jun 15, 1997, 1:41 PM MDT (19:41 UTC)
Expired
Jun 15, 1997, 2:15 PM MDT
In force
34 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Larimer County, CO, Weld County, CO

The radar

The Cheyenne radar (KCYS), 42 km from the middle of the area, began a volume at 19:42 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 7.7 hours before the alert went out and 173 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 12:00Z on 1997-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 62 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 12:00Z on 1997-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -73 square meters per square second.1939587897Sfc1 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
62 J/kg
Mixed-layer CIN
-239 J/kg
Mixed-layer LCL
1525 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-73 m²/s²
0-3 km storm-relative helicity
-77 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDEN 151947 RRA
SVRDEN
COC069-123-152015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
141 PM MDT SUN JUN 15 1997

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 215 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...

IN NORTHEAST COLORADO
     NORTHWESTERN WELD

IN NORTH CENTRAL COLORADO
     EAST CENTRAL LARIMER

INCLUDING THE FOLLOWING LOCATIONS
     CARR...NUNN...ROCKPORT AND WELLINGTON

AT 135 PM MDT THE PUBLIC REPORTED 3/4 INCH HAIL 2 MILES NORTHWEST OF 
WAVERLY...OR ABOUT 10 MILES NORTH OF FORT COLLINS.  NATIONAL WEATHER 
SERVICE DOPPLER RADAR ALSO INDICATED ANOTHER STRONG THUNDERSTORM TO 
THE NORTHEAST OF CARR...IN NORTHWESTERN WELD COUNTY.

THE STORMS WERE MOVING EAST AT 5 MILES PER HOUR.

HAIL UP TO ONE INCH IN DIAMETER AND BRIEF HEAVY RAINS WILL OCCUR 
WITH THESE THUNDERSTORMS.  MOVE TO SHELTER UNTIL THE STORM PASSES TO 
AVOID BEING STRUCK BY LIGHTNING. 

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN DENVER.

DANKERS
LAT...LON 4072 10464 4061 10513 4076 10524 4088 10501
          4100 10461

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 15, 11:25 AM MDT, 2 hours 16 minutes before
COZ030-032>050-160600-

SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO
NATIONAL WEATHER SERVICE DENVER CO
1125 AM MDT SUN JUN 15 1997

THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES

ADAMS     ARAPAHOE     BOULDER   CLEAR CREEK   DENVER       DOUGLAS
ELBERT    GILPIN       GRAND     JACKSON       JEFFERSON    LARIMER
LINCOLN   LOGAN        MORGAN    PARK          PHILLIPS     SEDGWICK
SUMMIT    WASHINGTON   WELD

SYNOPSIS: THE AIRMASS OVER NORTHEAST COLORADO HAS MODIFIED THIS
MORNING IN THE WAKE OF A WEATHER DISTURBANCE WHICH PASSED SOUTH OF
THE AREA OVERNIGHT.  AS A RESULT...THE CURRENT WIND PROFILE DOES NOT
FAVOR THE DEVELOPMENT OF STRONG OR EVEN SEVERE THUNDERSTORMS TODAY.

THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG THE FOOTHILLS...MOVING
ONTO THE PLAINS DURING THE AFTERNOON AND EVENING.  A WEAK COLD FRONT
AN AND UPPER LEVEL DISTURBANCE WILL MOVE ACROSS NORTHEAST COLORADO
THIS AFTERNOON...BRINGING AN INCREASE IN LOW LEVEL MOISTURE ACROSS
NORTHEAST COLORADO.  AS A RESULT...SOME OF THE STORMS COULD PRODUCE
BRIEF HEAVY RAINS AS WELL AS SMALL HAIL...MAINLY EAST OF A LIMON TO
AKRON LINE AND OVER THE MOUNTAINS AND HIGHER FOOTHILLS.

SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY.

LESZCYNSKI
Special weather statement, Jun 15, 11:26 AM MDT, 2 hours 15 minutes before
COZ030-032>050-160600-

SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO
NATIONAL WEATHER SERVICE DENVER CO
1125 AM MDT SUN JUN 15 1997

THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES

ADAMS     ARAPAHOE     BOULDER   CLEAR CREEK   DENVER       DOUGLAS
ELBERT    GILPIN       GRAND     JACKSON       JEFFERSON    LARIMER
LINCOLN   LOGAN        MORGAN    PARK          PHILLIPS     SEDGWICK
SUMMIT    WASHINGTON   WELD

SYNOPSIS: THE AIRMASS OVER NORTHEAST COLORADO HAS MODIFIED THIS
MORNING IN THE WAKE OF A WEATHER DISTURBANCE WHICH PASSED SOUTH OF
THE AREA OVERNIGHT.  AS A RESULT...THE CURRENT WIND PROFILE DOES NOT
FAVOR THE DEVELOPMENT OF STRONG OR EVEN SEVERE THUNDERSTORMS TODAY.

THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG THE FOOTHILLS...MOVING
ONTO THE PLAINS DURING THE AFTERNOON AND EVENING.  A WEAK COLD FRONT
AN AND UPPER LEVEL DISTURBANCE WILL MOVE ACROSS NORTHEAST COLORADO
THIS AFTERNOON...BRINGING AN INCREASE IN LOW LEVEL MOISTURE ACROSS
NORTHEAST COLORADO.  AS A RESULT...SOME OF THE STORMS COULD PRODUCE
BRIEF HEAVY RAINS AS WELL AS SMALL HAIL...MAINLY EAST OF A LIMON TO
AKRON LINE AND OVER THE MOUNTAINS AND HIGHER FOOTHILLS.

SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY.

LESZCYNSKI

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 14, 6:05 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld35 min
Jun 14, 7:35 PM MDTSevere Thunderstorm WarningBOUAdams, Washington25 min
Jun 14, 7:55 PM MDTSevere Thunderstorm WarningBOULogan, Phillips, Sedgwick45 min
Jun 14, 8:52 PM MDTSevere Thunderstorm WarningBOULogan, Phillips, Sedgwick38 min
Jun 14, 9:38 PM MDTSevere Thunderstorm WarningBOUPhillips27 min
Jun 15, 12:33 AM MDTFlash Flood WarningBOUPhillips3 hr
Jun 15, 3:25 AM MDTFlash Flood WarningBOUPhillips2 hr
Jun 15, 5:23 AM MDTFlash Flood WarningBOUPhillips3 hr
Jun 15, 3:11 PM MDTSevere Thunderstorm WarningBOUAdams, Boulder, Weld34 min
Jun 15, 3:20 PM MDTTornado WarningBOUAdams, Weld25 min
Jun 15, 3:20 PM MDTTornado WarningBOUBoulder25 min
Jun 15, 3:53 PM MDTSevere Thunderstorm WarningBOUAdams, Weld32 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1997Every severe thunderstorm warning in 1997

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; radar from the NEXRAD Level II archive.