Alert archive / Colorado / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 39, NWS Denver/Boulder, CO

May 8, 2003Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 8, 2003, 10:04 AM MDT for Weld County, Colorado. It was in force for 56 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 8, 2003, 10:04 AM MDT (16:04 UTC)
Expired: May 8, 2003, 11:00 AM MDT
In force: 56 min
Issued by: NWS Denver/Boulder, CO
Area: Counties, with a storm outline in the text

County Weld County, CO

The radar

The Denver radar (KFTG), 62 km from the middle of the area, began a volume at 16:06 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, 4.1 hours before the alert went out and 121 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: 13 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 830 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 98 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.

385 
WUUS55 KBOU 081604
SVRBOU
COC123-081700-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
1003 AM MDT THU MAY 8 2003

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL WELD COUNTY IN NORTHEAST COLORADO

* UNTIL 1100 AM MDT

* AT 1003 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 7 MILES SOUTH OF KERSEY...OR ABOUT 14 MILES   
SOUTHEAST OF GREELEY.  THE STORM WAS MOVING AT 5 MPH TO THE 
NORTHEAST.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
BARNESVILLE...GILL...KERSEY AND MILTON RESERVOIR.

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG
BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...AND DEADLY
LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY
FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 4024 10468 4019 10442 4052 10415 4052 10462

GARD...WFO BOULDER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 11:13 AM MDT	Tornado Warning	BOU	Adams	17 min
May 8, 11:52 AM MDT	Tornado Warning	BOU	Adams, Denver	38 min
May 8, 12:10 PM MDT	Tornado Warning	BOU	Weld	35 min
May 8, 12:50 PM MDT	Tornado Warning	BOU	Morgan	40 min
May 8, 1:12 PM MDT	Tornado Warning	BOU	Morgan, Washington	48 min
May 8, 1:53 PM MDT	Severe Thunderstorm Warning	BOU	Washington	37 min
May 8, 2:01 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	44 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2003 Every severe thunderstorm warning in 2003

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.