Alert archive / Colorado / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 21, NWS Denver/Boulder, CO

May 7, 2014Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 7, 2014, 8:32 PM MDT for Weld County, Colorado. It was in force for 28 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: May 7, 2014, 8:32 PM MDT (02:32 UTC)
Expired: May 7, 2014, 9:00 PM MDT
In force: 28 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Weld County, CO

The radar

The Denver radar (KFTG), 45 km from the middle of the area, began a volume at 02:34 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
May 7, 8:47 PM MDT	HAIL 1	Dacono, CO

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

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 2.5 hours before the alert went out and 147 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: 662 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 1719 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 205 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

187 
WUUS55 KBOU 080232
SVRBOU
COC123-080300-
/O.NEW.KBOU.SV.W.0021.140508T0232Z-140508T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
832 PM MDT WED MAY 7 2014

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

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

* UNTIL 900 PM MDT

* AT 832 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED OVER DACONO...OR
  22 MILES NORTH OF DENVER...MOVING NORTHEAST AT 20 MPH.

  HAZARD...QUARTER SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...DAMAGE TO VEHICLES IS EXPECTED. 

* LOCATIONS IMPACTED INCLUDE...
  ERIE...FIRESTONE...FREDERICK...FORT LUPTON AND DACONO. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

LARGE HAIL AND DAMAGING WINDS AND CONTINUOUS CLOUD TO GROUND
LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY.
LIGHTNING IS ONE OF NATURES LEADING KILLERS. REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 4012 10476 4000 10487 4001 10496 4004 10497
      4002 10500 4001 10499 4001 10503 4009 10505
      4020 10497
TIME...MOT...LOC 0232Z 211DEG 18KT 4005 10494 

HAIL...1.00IN
WIND...<50MPH

$$

BAKER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 6:00 PM MDT	Tornado Warning	BOU	Phillips, Sedgwick	30 min
May 7, 6:39 PM MDT	Severe Thunderstorm Warning	BOU	Larimer	36 min
May 7, 6:43 PM MDT	Special Weather Statement	BOU	Broomfield	32 min
May 7, 6:51 PM MDT	Severe Thunderstorm Warning	BOU	Weld	24 min
May 7, 7:12 PM MDT	Severe Thunderstorm Warning	BOU	Weld	33 min
May 7, 7:21 PM MDT	Severe Thunderstorm Warning	BOU	Boulder, Jefferson	24 min
May 7, 7:44 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Boulder, Broomfield, Denver, Jefferson	31 min
May 7, 8:02 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Boulder, Broomfield, Denver	28 min
May 7, 8:51 PM MDT	Special Weather Statement	BOU	Broomfield	39 min
May 8, 2:55 PM MDT	Special Weather Statement	BOU	Lincoln	50 min
May 8, 3:05 PM MDT	Special Weather Statement	BOU	Broomfield, Jefferson	40 min
May 8, 3:28 PM MDT	Tornado Warning Tornado observed	BOU	Lincoln	32 min
May 8, 3:58 PM MDT	Special Weather Statement	BOU	Denver	32 min
May 8, 4:06 PM MDT	Special Weather Statement	BOU	Broomfield	24 min
May 8, 4:12 PM MDT	Special Weather Statement	BOU	Lincoln	48 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2014 Every severe thunderstorm warning in 2014

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.