Alert archive / Colorado / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 52, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 7, 2012, 8:31 PM MDT for Weld County, Colorado. It was in force for 20 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
- Jun 7, 2012, 8:31 PM MDT (02:31 UTC)
- Expired
- Jun 7, 2012, 8:51 PM MDT
- In force
- 20 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 2.5 in
- Wind
- 60.0 mph
County Weld County, CO
The radar
The Cheyenne radar (KCYS), 77 km from the middle of the area, began a volume at 02:31 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 |
|---|---|---|---|
| Jun 7, 11:46 AM MDT | Tornado Watch | SPC | 10 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 2.5 hours before the alert went out and 125 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.
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
896
WUUS55 KBOU 080231
SVRBOU
COC123-080315-
/O.NEW.KBOU.SV.W.0052.120608T0231Z-120608T0315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
831 PM MDT THU JUN 7 2012
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTH CENTRAL WELD COUNTY IN NORTHEAST COLORADO
* UNTIL 915 PM MDT
* AT 829 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DESTRUCTIVE HAIL UP
TO TENNIS BALL SIZE...AND DAMAGING WINDS UP TO ABOUT 60 MPH. THIS
STORM WAS LOCATED 2 MILES NORTHWEST OF GROVER...OR 42 MILES
NORTHEAST OF GREELEY...MOVING SOUTHEAST AT 15 MPH.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PAWNEE
BUTTES AND GROVER.
TWO INCH HAIL WAS REPORTED WITH THIS STORM IN HEREFORD IN WELD
COUNTY AT 8:15 PM MDT.
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 1000 PM MDT THURSDAY EVENING
FOR NORTHEAST COLORADO.
&&
LAT...LON 4083 10372 4072 10401 4072 10434 4094 10438
4098 10376
TIME...MOT...LOC 0229Z 334DEG 14KT 4089 10424
WIND...HAIL 60MPH 2.50IN
$$1 follow-up statement
396
WWUS55 KBOU 080251
SVSBOU
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
851 PM MDT THU JUN 7 2012
COC123-080301-
/O.CAN.KBOU.SV.W.0052.000000T0000Z-120608T0315Z/
WELD CO-
851 PM MDT THU JUN 7 2012
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL WELD COUNTY IS
CANCELLED...
THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND IS NO
LONGER EXPECTED TO PRODUCE SEVERE WEATHER.
LAT...LON 4083 10372 4072 10401 4072 10434 4094 10438
4098 10376
TIME...MOT...LOC 0251Z 334DEG 14KT 4081 10419
$$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, 6:31 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 44 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, 8:33 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, 2012Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.