Alert archive / Colorado / Tornado Warnings in 2013

Tornado Warning 1, NWS Denver/Boulder, CO

April 8, 2013Phillips County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Apr 8, 2013, 7:17 PM MDT for Phillips County, Colorado. It was in force for 28 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 8, 2013, 7:17 PM MDT (01:17 UTC)
Expired
Apr 8, 2013, 7:45 PM MDT
In force
28 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon

County Phillips County, CO

The radar

The Goodland radar (KGLD), 142 km from the middle of the area, began a volume at 01:19 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.

IssuedProductOfficeLasted
Apr 8, 2:16 PM MDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.3 hours before the alert went out and 96 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 00:00Z on 2013-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 105 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 00:00Z on 2013-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
105 J/kg
Mixed-layer CIN
-87 J/kg
Mixed-layer LCL
2884 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
258 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

439 
WFUS55 KBOU 090117
TORBOU
COC095-090145-
/O.NEW.KBOU.TO.W.0001.130409T0117Z-130409T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
717 PM MDT MON APR 8 2013

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTH CENTRAL PHILLIPS COUNTY IN NORTHEAST COLORADO

* UNTIL 745 PM MDT

* AT 716 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO OVER EXTREME
  SOUTH CENTRAL PHILLIPS COUNTY...OR 14 MILES SOUTHWEST OF HOLYOKE.
  THIS STORM WAS MOVING NORTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF     
  THE WARNED COUNTY SOUTH OF PAOLI.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING LARGE
DAMAGING HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

&&

LAT...LON 4053 10234 4043 10245 4045 10256 4051 10257
      4057 10252
TIME...MOT...LOC 0116Z 214DEG 11KT 4045 10249

$$
1 follow-up statement
872 
WWUS55 KBOU 090128
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
728 PM MDT MON APR 8 2013

COC095-090145-
/O.CON.KBOU.TO.W.0001.000000T0000Z-130409T0145Z/
PHILLIPS CO-
728 PM MDT MON APR 8 2013

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM MDT FOR SOUTH
CENTRAL PHILLIPS COUNTY...

AT 728 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS STORM WAS
LOCATED OVER SOUTH CENTRAL PHILLIPS COUNTY...OR 11 MILES SOUTHWEST OF
HOLYOKE. THIS STORM WAS MOVING NORTHEAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF THE 
WARNED COUNTY SOUTH OF PAOLI.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING LARGE
DAMAGING HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

&&

LAT...LON 4053 10234 4043 10245 4048 10253 4052 10256
      4057 10252
TIME...MOT...LOC 0128Z 214DEG 11KT 4048 10246

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 8, 6:31 PM MDTSpecial Weather StatementBOUWashington44 min
Apr 8, 7:03 PM MDTSevere Thunderstorm WarningBOUMorgan, Washington27 min
Apr 8, 7:24 PM MDTTornado WarningBOUWashington36 min
Apr 8, 7:34 PM MDTTornado WarningBOUMorgan, Washington26 min
Apr 8, 7:46 PM MDTSevere Thunderstorm WarningBOUPhillips29 min
Apr 8, 7:59 PM MDTTornado WarningBOUMorgan, Washington46 min
Apr 8, 8:06 PM MDTTornado WarningBOUWashington24 min
Apr 8, 8:20 PM MDTSevere Thunderstorm WarningBOUPhillips, Sedgwick40 min
Apr 8, 8:33 PM MDTTornado WarningBOUWashington27 min
Apr 8, 8:52 PM MDTTornado WarningBOUWashington23 min
Apr 8, 9:00 PM MDTTornado WarningBOULogan, Phillips30 min
Apr 8, 9:17 PM MDTTornado WarningBOUWashington28 min
Apr 8, 9:31 PM MDTTornado WarningBOUPhillips29 min
Apr 8, 9:45 PM MDTTornado WarningBOUWashington30 min
Apr 8, 10:01 PM MDTSevere Thunderstorm WarningBOUSedgwick29 min

Nearby

Tornado Warnings in Colorado, 2013Every tornado warning in 2013Tornadoes in 2013

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.