Alert archive / Colorado / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 21, NWS Denver/Boulder, CO

April 23, 2007Lincoln County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Apr 23, 2007, 8:20 PM MDT for Lincoln County, Colorado. It was in force for 30 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: Apr 23, 2007, 8:20 PM MDT (02:20 UTC)
Expired: Apr 23, 2007, 8:50 PM MDT
In force: 30 min
Issued by: NWS Denver/Boulder, CO
Area: Counties, with a storm outline in the text

County Lincoln County, CO

The radar

The Denver radar (KFTG), 121 km from the middle of the area, began a volume at 02:21 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 23, 2:10 PM MDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 2.3 hours before the alert went out and 58 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: 351 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1440 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 187 m²/s²
0-3 km storm-relative helicity: 380 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 4.5

Open this sounding in Storm Lab

The text

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

000 
WUUS55 KBOU 240220
SVRBOU
COC073-240315-
/O.NEW.KBOU.SV.W.0021.070424T0220Z-070424T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
820 PM MDT MON APR 23 2007

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN LINCOLN COUNTY IN EAST CENTRAL COLORADO

* UNTIL 915 PM MDT

* AT 820 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED 5 MILES SOUTH OF ARRIBA...OR ABOUT 23 MILES EAST
  OF LIMON...MOVING NORTH AT 15 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ARRIBA.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM MDT MONDAY EVENING FOR
NORTHEASTERN COLORADO.

LAT...LON 3920 10334 3919 10316 3957 10314 3957 10332

$$

BARJENBRUCH

1 follow-up statement

000 
WWUS55 KBOU 240250
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
850 PM MDT MON APR 23 2007

COC073-240300-
/O.CAN.KBOU.SV.W.0021.000000T0000Z-070424T0315Z/
LINCOLN CO-
850 PM MDT MON APR 23 2007

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LINCOLN COUNTY IS
CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND IS NO
LONGER EXPECTED TO PRODUCE SEVERE WEATHER.

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MDT TUESDAY MORNING
FOR NORTHEASTERN COLORADO.

LAT...LON 3920 10334 3919 10316 3957 10314 3957 10332

$$
BARJENBRUCH

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 6:04 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	56 min
Apr 23, 6:18 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	57 min
Apr 23, 6:27 PM MDT	Tornado Warning	BOU	Logan	48 min
Apr 23, 6:59 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Morgan, Washington	61 min
Apr 23, 7:15 PM MDT	Tornado Warning	BOU	Logan	45 min
Apr 23, 7:43 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe	28 min
Apr 23, 7:51 PM MDT	Tornado Warning	BOU	Morgan, Washington	39 min
Apr 23, 8:02 PM MDT	Severe Thunderstorm Warning	BOU	Logan	58 min
Apr 23, 8:38 PM MDT	Severe Thunderstorm Warning	BOU	Washington	67 min
Apr 23, 9:46 PM MDT	Severe Thunderstorm Warning	BOU	Washington	59 min
Apr 23, 10:41 PM MDT	Severe Thunderstorm Warning	BOU	Washington	43 min
Apr 23, 10:57 PM MDT	Tornado Warning	BOU	Phillips	33 min
Apr 24, 5:31 AM MDT	Snow Advisory	BOU	Park	10 hr
Apr 24, 12:19 PM MDT	Tornado Warning	BOU	Lincoln	41 min
Apr 24, 12:58 PM MDT	Tornado Warning	BOU	Lincoln	47 min
Apr 24, 3:46 PM MDT	Snow and Blowing Snow Advisory	BOU	Adams, Arapahoe, Boulder, Elbert, Grand, Jackson and 2 more	12 hr

Nearby

Severe Thunderstorm Warnings in Colorado, 2007 Every severe thunderstorm warning in 2007

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.