Alert archive / Colorado / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 40, NWS Denver/Boulder, CO

June 6, 2012Denver County, Jefferson County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 6, 2012, 11:34 PM MDT for Denver County, Jefferson County, Colorado. It was in force for 41 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 6, 2012, 11:34 PM MDT (05:34 UTC)
Expired: Jun 7, 2012, 12:15 AM MDT
In force: 41 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Denver County, CO, Jefferson County, CO

The radar

The Denver radar (KFTG), 48 km from the middle of the area, began a volume at 05:38 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, 12:00 AM MDT	HAIL 1.5	Lakewood, CO	PING PONG SIZED HAIL KIPLING AND HAMDEN

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

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 5.6 hours before the alert went out and 160 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: 859 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 2447 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

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

324 
WUUS55 KBOU 070534
SVRBOU
COC031-059-070615-
/O.NEW.KBOU.SV.W.0040.120607T0534Z-120607T0615Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
1134 PM MDT WED JUN 6 2012

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL JEFFERSON COUNTY IN NORTHEAST COLORADO
  SOUTHWESTERN DENVER COUNTY IN NORTHEAST COLORADO

* UNTIL 1215 AM MDT

* AT 1134 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 3
  MILES SOUTHEAST OF MORRISON...OR 12 MILES SOUTHWEST OF DENVER...
  MOVING NORTHEAST AT 10 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO TINY
  TOWN...RED ROCKS PARK...MORRISON...INDIAN HILLS...IDLEDALE...
  SOUTHERN WHEAT RIDGE...LAKEWOOD...SOUTHEASTERN GOLDEN AND
  SOUTHWESTERN DENVER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

LAT...LON 3958 10528 3978 10519 3976 10498 3968 10501
      3968 10502 3966 10502 3966 10503 3963 10503
      3963 10505 3957 10506
TIME...MOT...LOC 0534Z 204DEG 12KT 3964 10514
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 6, 6:12 PM MDT	Severe Thunderstorm Warning	BOU	Weld	48 min
Jun 6, 6:21 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Douglas, Elbert	54 min
Jun 6, 6:30 PM MDT	Areal Flood Advisory	BOU	Arapahoe, Elbert	90 min
Jun 6, 6:35 PM MDT	Tornado Warning	BOU	Adams, Arapahoe, Douglas, Elbert	40 min
Jun 6, 7:07 PM MDT	Tornado Warning	BOU	Douglas, Elbert	38 min
Jun 6, 7:16 PM MDT	Flash Flood Warning	BOU	Arapahoe, Douglas, Elbert	3 hr
Jun 6, 7:16 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Douglas, Elbert	44 min
Jun 6, 7:25 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Weld	35 min
Jun 6, 7:42 PM MDT	Tornado Warning	BOU	Douglas, Elbert	33 min
Jun 6, 7:43 PM MDT	Severe Thunderstorm Warning	BOU	Weld	47 min
Jun 6, 7:44 PM MDT	Tornado Warning	BOU	Arapahoe	31 min
Jun 6, 7:56 PM MDT	Severe Thunderstorm Warning	BOU	Douglas	49 min
Jun 6, 8:05 PM MDT	Tornado Warning	BOU	Douglas	25 min
Jun 6, 8:13 PM MDT	Areal Flood Advisory	BOU	Douglas	92 min
Jun 6, 8:30 PM MDT	Tornado Warning	BOU	Douglas, Elbert	30 min
Jun 6, 8:37 PM MDT	Flash Flood Warning	BOU	Douglas	3 hr
Jun 6, 8:38 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Denver	52 min
Jun 6, 9:00 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Douglas, Elbert	45 min
Jun 6, 9:39 PM MDT	Severe Thunderstorm Warning	BOU	Douglas	51 min
Jun 6, 9:53 PM MDT	Flash Flood Warning	BOU	Larimer	82 min
Jun 6, 10:25 PM MDT	Flash Flood Warning	BOU	Arapahoe, Douglas, Elbert	3 hr
Jun 6, 10:28 PM MDT	Severe Thunderstorm Warning	BOU	Douglas	32 min
Jun 6, 11:02 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Douglas	43 min
Jun 6, 11:30 PM MDT	Flash Flood Warning	BOU	Douglas	3 hr
Jun 6, 11:50 PM MDT	Tornado Warning	BOU	Denver, Jefferson	25 min
Jun 7, 12:16 AM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Denver, Douglas, Jefferson	44 min
Jun 7, 12:30 AM MDT	Areal Flood Advisory	BOU	Arapahoe, Denver, Jefferson	90 min
Jun 7, 12:52 AM MDT	Flash Flood Warning	BOU	Arapahoe, Denver, Jefferson	3 hr
Jun 7, 12:56 AM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Denver, Douglas	33 min
Jun 7, 1:39 AM MDT	Areal Flood Warning	BOU	Adams, Arapahoe, Denver, Douglas, Elbert, Jefferson	7 hr
Jun 7, 8:43 AM MDT	Areal Flood Advisory	BOU	Adams, Arapahoe, Denver	4 hr
Jun 7, 10:47 AM MDT	Flash Flood Watch	BOU	Adams, Arapahoe, Broomfield, Denver, Douglas, Elbert	13 hr
Jun 7, 4:22 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Morgan, Weld	53 min
Jun 7, 4:25 PM MDT	Fire Weather Watch	BOU	Boulder, Clear Creek, Gilpin, Grand, Jackson, Larimer and 2 more	23 hr
Jun 7, 4:51 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe	39 min
Jun 7, 5:06 PM MDT	Tornado Warning	BOU	Arapahoe	24 min
Jun 7, 5:09 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	51 min
Jun 7, 5:28 PM MDT	Tornado Warning	BOU	Arapahoe, Elbert	32 min
Jun 7, 5:49 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Morgan, Washington, Weld	41 min
Jun 7, 5:54 PM MDT	Tornado Warning	BOU	Elbert	36 min
Jun 7, 5:59 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe	31 min

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.