Alert archive / Colorado / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 85, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 6, 2012, 9:46 PM MDT for Logan County, Washington County, Colorado. It was in force for 44 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
- Jul 6, 2012, 9:46 PM MDT (03:46 UTC)
- Expired
- Jul 6, 2012, 10:30 PM MDT
- In force
- 44 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 50.0 mph
Counties Logan County, CO, Washington County, CO
The radar
The Denver radar (KFTG), 138 km from the middle of the area, began a volume at 03:49 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 nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 3.8 hours before the alert went out and 64 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
- 180 J/kg
- Mixed-layer CIN
- -101 J/kg
- Mixed-layer LCL
- 1123 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 291 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.8
The text
As transmitted, in the capitals the NWS used until 2016.
990 WUUS55 KBOU 070346 SVRBOU COC075-121-070430- /O.NEW.KBOU.SV.W.0085.120707T0346Z-120707T0430Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DENVER CO 946 PM MDT FRI JUL 6 2012 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTH CENTRAL WASHINGTON COUNTY IN NORTHEAST COLORADO SOUTH CENTRAL LOGAN COUNTY IN NORTHEAST COLORADO * UNTIL 1030 PM MDT * AT 947 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL. THIS STORM WAS LOCATED 7 MILES WEST OF BURDETT...OR 15 MILES NORTHEAST OF AKRON...MOVING NORTHWEST AT 15 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MERINO AND BURDETT. 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 4053 10343 4058 10293 4029 10290 4027 10316 TIME...MOT...LOC 0347Z 153DEG 13KT 4035 10308 WIND...HAIL <50MPH 1.50IN $$
2 follow-up statements
578 WWUS55 KBOU 070410 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1010 PM MDT FRI JUL 6 2012 COC075-121-070430- /O.CON.KBOU.SV.W.0085.000000T0000Z-120707T0430Z/ WASHINGTON CO-LOGAN CO- 1010 PM MDT FRI JUL 6 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM MDT FOR SOUTH CENTRAL LOGAN AND NORTH CENTRAL WASHINGTON COUNTIES... AT 1009 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL. THIS STORM WAS LOCATED 9 MILES WEST OF BURDETT...OR 16 MILES SOUTH OF STERLING...MOVING NORTHWEST AT 15 MPH. VERY HEAVY RAIN IS ALSO EXPECTED WITH THIS STORM WITH LOCALIZED FLOODING POSSIBLE OVER LOW LYING AREAS. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MERINO AND BURDETT. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN. && LAT...LON 4053 10343 4058 10293 4029 10290 4027 10316 TIME...MOT...LOC 0409Z 154DEG 11KT 4041 10312 WIND...HAIL <50MPH 1.50IN $$
272 WWUS55 KBOU 070429 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1029 PM MDT FRI JUL 6 2012 COC075-121-070438- /O.EXP.KBOU.SV.W.0085.000000T0000Z-120707T0430Z/ WASHINGTON CO-LOGAN CO- 1029 PM MDT FRI JUL 6 2012 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL LOGAN AND NORTH CENTRAL WASHINGTON COUNTIES WILL EXPIRE AT 1030 PM MDT... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND IS NO LONGER EXPECTED TO PRODUCE SEVERE WEATHER. HEAVY RAIN AND GUSTY WINDS TO 45 MPH CAN STILL BE EXPECTED WITH THIS STORM. LAT...LON 4053 10343 4058 10293 4029 10290 4027 10316 TIME...MOT...LOC 0428Z 190DEG 16KT 4046 10305 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 6:29 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Elbert | 43 min |
| Jul 6, 6:57 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 50 min |
| Jul 6, 8:26 PM MDT | Areal Flood Advisory | BOU | Morgan, Washington | 94 min |
| Jul 6, 8:41 PM MDT | Flash Flood Watch | BOU | Arapahoe, Boulder, Broomfield, Clear Creek, Douglas, Elbert and 8 more | 32 hr |
| Jul 6, 8:56 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 6, 9:01 PM MDT | Areal Flood Advisory | BOU | Washington | 59 min |
| Jul 6, 9:06 PM MDT | Flash Flood Warning | BOU | Boulder | 97 min |
| Jul 6, 11:20 PM MDT | Areal Flood Advisory | BOU | Logan, Washington, Weld | 115 min |
| Jul 7, 3:08 PM MDT | Areal Flood Advisory | BOU | Boulder | 97 min |
| Jul 7, 3:23 PM MDT | Areal Flood Advisory | BOU | Clear Creek | 97 min |
| Jul 7, 3:41 PM MDT | Flash Flood Warning | BOU | Boulder | 94 min |
| Jul 7, 3:45 PM MDT | Flash Flood Warning | BOU | Boulder | 90 min |
| Jul 7, 3:57 PM MDT | Flash Flood Warning | BOU | Clear Creek | 93 min |
| Jul 7, 4:19 PM MDT | Areal Flood Advisory | BOU | Adams, Arapahoe, Denver, Douglas, Jefferson | 86 min |
| Jul 7, 4:30 PM MDT | Areal Flood Advisory | BOU | Boulder | 90 min |
| Jul 7, 4:36 PM MDT | Areal Flood Advisory | BOU | Larimer | 84 min |
| Jul 7, 4:49 PM MDT | Areal Flood Advisory | BOU | Larimer | 86 min |
| Jul 7, 4:53 PM MDT | Flash Flood Warning | BOU | Boulder | 106 min |
| Jul 7, 5:01 PM MDT | Areal Flood Advisory | BOU | Boulder | 119 min |
| Jul 7, 5:35 PM MDT | Areal Flood Advisory | BOU | Boulder | 85 min |
| Jul 7, 5:59 PM MDT | Areal Flood Advisory | BOU | Larimer | 91 min |
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.