Alert archive / Colorado / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 21, NWS Denver/Boulder, CO

May 23, 1996Adams County, Morgan County, Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 23, 1996, 12:41 AM MDT for Adams County, Morgan County, Weld County, Colorado. It was in force for 49 min. 3 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: May 23, 1996, 12:41 AM MDT (06:41 UTC)
Expired: May 23, 1996, 1:30 AM MDT
In force: 49 min
Issued by: NWS Denver/Boulder, CO
Area: Whole counties

Counties Adams County, CO, Morgan County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 58 km from the middle of the area, began a volume at 06:44 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.

What was reported inside it

Time	Report	Where
May 23, 1:20 AM MDT	Hail 1	Ft Morgan, CO
May 23, 1:20 AM MDT	Hail 1	Ft Morgan, CO
May 23, 1:40 AM MDT	Hail 1.75	Brush, 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.

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 6.7 hours before the alert went out and 90 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: 173 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 3436 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 36 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 230642
SVRDEN
COC001-087-123-230730-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
1241 AM MDT THU MAY 23 1996

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 130 AM MDT FOR PEOPLE IN
THE FOLLOWING COUNTIES

IN NORTHEASTERN COLORADO
     NORTHEASTERN ADAMS...SOUTHWESTERN MORGAN AND SOUTH CENTRAL
     WELD

INCLUDING THE FOLLOWING LOCATIONS
     ADENA...ADENA SCHOOL...HOYT...LEADER...PROSPECT VALLEY...
     SHAMROCK AND TWELVE-MILE CORNER

AT 1241 AM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A SEVERE THUNDERSTORM 8 MILES SOUTHEAST OF PROSPECT VALLEY ...
OR ABOUT 38 MILES SOUTHEAST OF GREELEY.

THIS STORM WAS LIKELY PRODUCING LARGE HAIL IN EXCESS OF 1 INCH IN 
DIAMETER.  

THE STORM WAS MOVING EAST AT 35 MPH. 

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY
SHELTER AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS.
REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING
HAIL...DAMAGING WINDS OVER 60 MPH...DEADLY LIGHTNING...AND VERY
HEAVY RAIN.

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

BARJENBRUCH

LAT...LON 3989 10371 3988 10428 4012 10442 4027 10380

The office that day

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

Issued	Product	Office	Counties	Lasted
May 22, 6:04 PM MDT	Severe Thunderstorm Warning	BOU	Phillips	56 min
May 22, 6:29 PM MDT	Tornado Warning	BOU	Phillips	31 min
May 22, 6:57 PM MDT	Tornado Warning	BOU	Phillips	33 min
May 22, 11:06 PM MDT	Severe Thunderstorm Warning	BOU	Jefferson	39 min
May 22, 11:23 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Denver	52 min
May 22, 11:47 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Denver, Weld	43 min
May 23, 1:44 AM MDT	Severe Thunderstorm Warning	BOU	Morgan, Washington	31 min
May 23, 5:00 PM MDT	Tornado Warning	BOU	Arapahoe, Elbert	45 min
May 23, 5:00 PM MDT	Tornado Warning	BOU	Adams	45 min
May 23, 5:40 PM MDT	Tornado Warning	BOU	Adams, Arapahoe, Washington	60 min
May 23, 5:40 PM MDT	Tornado Warning	BOU	Elbert	60 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1996 Every severe thunderstorm warning in 1996

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; radar from the NEXRAD Level II archive.