Alert archive / Colorado / Severe Thunderstorm Warnings in 1995

Severe Thunderstorm Warning 83, NWS Denver/Boulder, CO

July 20, 1995Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 20, 1995, 1:41 PM MDT for Weld County, Colorado. It was in force for 34 min.

The area

The counties it named.

The facts

Issued: Jul 20, 1995, 1:41 PM MDT (19:41 UTC)
Expired: Jul 20, 1995, 2:15 PM MDT
In force: 34 min
Issued by: NWS Denver/Boulder, CO
Area: Whole counties

County Weld County, CO

The radar

The Cheyenne radar (KCYS), 75 km from the middle of the area, began a volume at 19:45 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 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 14 J/kg
Mixed-layer CIN: -196 J/kg
Mixed-layer LCL: 1458 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 55 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 201942 RRA
SVRDEN
COC123-202015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
141 PM MDT THU JUL 20 1995

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

IN NORTHEASTERN COLORADO
     NORTH CENTRAL WELD

INCLUDING THE FOLLOWING LOCATIONS
     GROVER

AT 141 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A SEVERE THUNDERSTORM 19 MILES WEST OF GROVER ...OR ABOUT 31
MILES NORTH OF GREELEY.

WEATHER SERVICE PERSONNEL AT CHEYENNE WYOMING REPORTED A FUNNEL CLOUD
WITH THIS THUNDERSTORM.  THE FUNNEL CLOUD HAS NOT TOUCHED DOWN.

THE STORM WAS MOVING TO THE EAST SOUTHEAST ABOUT 20 MPH.

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


LAT...LON 4064 10416 4067 10473 4097 10473 4096 10415

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, Jul 20, 10:56 AM MDT, 2 hours 45 minutes before

COZ015-030>050-210600-

SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO
NATIONAL WEATHER SERVICE DENVER CO
1100 AM MDT   THURSDAY   JULY 20 1995

THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES

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

SYNOPSIS:  DRYER AIR ALOFT HAS MOVED OVER THE AREA AS THE FLOW OF
MONSOON MOISTURE HAS BEEN SHUT OFF BY A SHIFT IN THE WINDS ALOFT.
A WEAK UPPER LEVEL DISTURBANCE WILL MOVE ACROSS THE AREA DURING THE
AFTERNOON AND WILL HELP TRIGGER SOME THUNDERSTORMS IN THE AFTERNOON.

WIDELY SCATTERED THUNDERSTORMS WILL DEVELOP ALONG THE FOOTHILLS AND
FRONT RANGE COMMUNITIES IN THE EARLY AFTERNOON HOURS.  THUNDERSTORMS
WILL BE A LITTLE MORE NUMEROUS EAST OF A FORT MORGAN-LIMON LINE SINCE
THERE IS A BETTER SUPPLY OF LOW LEVEL MOISTURE IN THE EASTERN PLAINS.

THE AIRMASS IS DRIER AND IS NOT AS UNSTABLE AS THE PREVIOUS FEW DAYS
SO THUNDERSTORMS ARE NOT EXPECTED TO BECOME SEVERE.  MAXIMUM RAINFALL
AMOUNTS ARE EXPECTED TO BE LESS THAN 1 INCH SINCE THE THUNDERSTORMS
WILL MOVE FAIRLY RAPIDLY DUE TO WESTERLY WINDS 15-25 MPH IN THE UPPER
ATMOSPHERE.  THE THREAT OF STREET OR SMALL STREAM FLOODING IS VERY
LOW TODAY.

NO SEVERE WEATHER...HEAVY RAIN OR FLOODING IS EXPECTED SO SPOTTER
ACTIVATION IS NOT ANTICIPATED.

BOODA

Local storm report, Jul 20, 10:59 AM MDT, 2 hours 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
1100 AM MDT THU JUL 20 1995

...UPDATED REPORT FOR WED JULY 19 1995...

TIME(MDT)  ...CITY LOCATION.....  ..STATE..  ...EVENT/REMARKS...
           ...COUNTY LOCATION...

640 PM     14W AGATE                 CO      WEAK TORNADO ON GROUND
                                             2 MINUTES.  SHINGLES RIPPED
                                             OFF HOUSE AND BARN DOORSN
                                             RIPPED OFF.  HALF INCH
                                             HAIL TO A FOOT DEEP
                                             DAMAGED A FIELD OF WHEAT.

RTG

Local storm report, Jul 20, 11:00 AM MDT, 2 hours 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
1100 AM MDT THU JUL 20 1995

...UPDATED REPORT FOR WED JULY 19 1995...

TIME(MDT)  ...CITY LOCATION.....  ..STATE..  ...EVENT/REMARKS...
           ...COUNTY LOCATION...

640 PM     14W AGATE                 CO      WEAK TORNADO ON GROUND
                                             2 MINUTES.  SHINGLES RIPPED
                                             OFF HOUSE AND BARN DOORS
                                             RIPPED OFF.  HALF INCH
                                             HAIL TO A FOOT DEEP
                                             DAMAGED A FIELD OF WHEAT.

RTG

Special weather statement, Jul 20, 1:10 PM MDT, 31 minutes before

COZ015-030>050-202100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1 PM MDT   THURSDAY   JULY 20 1995

...THUNDERSTORMS ON THE INCREASE IN NORTHEAST COLORADO...

THUNDERSTORMS HAVE DEVELOPED ALONG THE FRONT RANGE FOOTHILLS AGAIN THIS
AFTERNOON.  THE GREATEST NUMBER OF THUNDERSTORMS WERE LOCATED IN LARIMER
COUNTY BUT OTHER THUNDERSTORMS HAVE ALSO BEEN DETECTED IN JACKSON...
GRAND...SUMMIT...SOUTHERN JEFFERSON...PARK AND SOUTHERN DOUGLAS
COUNTIES AS WELL AS THE NORTHEAST CORNER OF WELD COUNTY.  MOST OF THE
THUNDERSTORMS ARE WEAK BUT THE THUNDERSTORM IN NORTHEAST WELD...15 MILES
EAST OF GROVER OR ABOUT 60 MILES SOUTH OF CHEYENNE WYOMING...IS OF
MODERATE INTENSITY.

SCATTERED THUNDERSTORMS ARE EXPECTED TO SPREAD ACROSS NORTHEAST COLORADO
DURING THE REST OF THE DAY AND EARLY THIS EVENING.  THE THUNDERSTORMS
WILL GENERALLY MOVE EAST AT 15 TO 25 MPH SO RAINFALL WILL GENERALLY BE
LESS THAN 1/2 INCH.  LOCALLY HEAVIER AMOUNTS UP TO AN INCH ARE POSSIBLE
FROM SOME OF THE STRONGER THUNDERSTORMS.

WHILE SEVERE THUNDERSTORMS ARE NOT EXPECTED IN COLORADO THIS AFTERNOON
ANYONE OUTDOORS SHOULD BE ALERT FOR THREATENING WEATHER AND TAKE SHELTER
IF NECESSARY.  REMEMBER THAT LIGHTNING BOLTS ARE DEADLY.  MONITOR NOAA
WEATHER RADIO OR LOCAL NEWS OUTLETS FOR THE LATEST WEATHER BULLETINS AND
FORECASTS.

BOODA

Nearby

Severe Thunderstorm Warnings in Colorado, 1995 Every severe thunderstorm warning in 1995

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.