Alert archive / Colorado / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 49, NWS Denver/Boulder, CO

June 7, 2012Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 7, 2012, 6:31 PM MDT for Weld County, Colorado. It was in force for 44 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 7, 2012, 6:31 PM MDT (00:31 UTC)
Expired: Jun 7, 2012, 7:15 PM MDT
In force: 44 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Weld County, CO

The radar

The Cheyenne radar (KCYS), 99 km from the middle of the area, began a volume at 00:32 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	Remark
Jun 7, 7:20 PM MDT	HAIL 2	New Raymer, CO	FUNNEL SIGHTED

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 7, 11:46 AM MDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.5 hours before the alert went out and 105 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: 1009 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 2384 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

564 
WUUS55 KBOU 080031
SVRBOU
COC123-080115-
/O.NEW.KBOU.SV.W.0049.120608T0031Z-120608T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
631 PM MDT THU JUN 7 2012

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

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

* UNTIL 715 PM MDT

* AT 631 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...
  AND DAMAGING WINDS UP TO ABOUT 60 MPH.  THIS STORM WAS LOCATED 6
  MILES NORTHEAST OF STONEHAM...OR 22 MILES WEST OF STERLING...MOVING
  NORTHEAST AT 5 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO STONEHAM...
  PAWNEE BUTTES...NEW RAYMER AND KEOTA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

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 IN
EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM MDT THURSDAY EVENING
FOR NORTHEASTERN COLORADO.

&&

LAT...LON 4092 10359 4057 10359 4053 10364 4053 10414
      4081 10415
TIME...MOT...LOC 0031Z 237DEG 4KT 4069 10362
WIND...HAIL 60MPH 1.25IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 7, 6:10 PM MDT	Severe Thunderstorm Warning	BOU	Logan	50 min
Jun 7, 6:28 PM MDT	Tornado Warning	BOU	Elbert	47 min
Jun 7, 7:05 PM MDT	Tornado Warning	BOU	Logan, Weld	40 min
Jun 7, 7:14 PM MDT	Tornado Warning	BOU	Elbert	31 min
Jun 7, 7:45 PM MDT	Severe Thunderstorm Warning	BOU	Weld	45 min
Jun 7, 8:05 PM MDT	Severe Thunderstorm Warning	BOU	Weld	40 min
Jun 7, 8:31 PM MDT	Severe Thunderstorm Warning	BOU	Weld	20 min
Jun 7, 8:33 PM MDT	Tornado Warning	BOU	Weld	27 min
Jun 7, 8:57 PM MDT	Tornado Warning	BOU	Weld	33 min
Jun 7, 9:00 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	45 min
Jun 7, 9:28 PM MDT	Tornado Warning	BOU	Weld	32 min
Jun 7, 9:42 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	48 min
Jun 7, 9:57 PM MDT	Tornado Warning	BOU	Weld	33 min
Jun 7, 10:15 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	45 min
Jun 7, 10:29 PM MDT	Severe Thunderstorm Warning	BOU	Weld	46 min
Jun 7, 10:37 PM MDT	Areal Flood Advisory	BOU	Weld	83 min
Jun 7, 10:59 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	34 min
Jun 7, 11:02 PM MDT	Severe Thunderstorm Warning	BOU	Weld	43 min
Jun 7, 11:12 PM MDT	Severe Thunderstorm Warning	BOU	Weld	33 min
Jun 8, 1:40 AM MDT	Severe Thunderstorm Warning	BOU	Elbert	37 min
Jun 8, 3:03 PM MDT	Red Flag Warning	BOU	Boulder, Clear Creek, Douglas, Gilpin, Grand, Jackson and 5 more	55 hr

Nearby

Severe Thunderstorm Warnings in Colorado, 2012 Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.