Alert archive / Colorado / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 9, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 5, 2012, 10:39 PM MDT for 4 counties in Colorado. It was in force for 51 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
- May 5, 2012, 10:39 PM MDT (04:39 UTC)
- Expired
- May 5, 2012, 11:30 PM MDT
- In force
- 51 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Adams County, CO, Arapahoe County, CO, Denver County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 19 km from the middle of the area, began a volume at 04:38 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.
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 4.7 hours before the alert went out and 107 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
- 102 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 3786 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
012 WUUS55 KBOU 060439 SVRBOU COC001-005-031-123-060530- /O.NEW.KBOU.SV.W.0009.120506T0439Z-120506T0530Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DENVER CO 1039 PM MDT SAT MAY 5 2012 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTH CENTRAL ARAPAHOE COUNTY IN NORTHEAST COLORADO CENTRAL ADAMS COUNTY IN NORTHEAST COLORADO NORTHEASTERN DENVER COUNTY IN NORTHEAST COLORADO SOUTH CENTRAL WELD COUNTY IN NORTHEAST COLORADO * UNTIL 1130 PM MDT * AT 1039 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER HAIL. THIS STORM WAS LOCATED OVER EXTREME NORTHEASTERN AURORA...OR 21 MILES EAST OF DENVER...MOVING NORTHEAST AT 25 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO D.I.A. TERMINAL AND CONCOURSES...STRASBURG...MANILA VILLAGE...LOCHBUIE... KEENESBURG...BENNETT...BARR LAKE...EASTERN DENVER INTERNATIONAL AIRPORT AND NORTHEASTERN AURORA. 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 4014 10453 3983 10408 3966 10446 3997 10482 TIME...MOT...LOC 0439Z 235DEG 21KT 3982 10455 WIND...HAIL <50MPH 1.00IN $$
1 follow-up statement
728 WWUS55 KBOU 060501 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1101 PM MDT SAT MAY 5 2012 COC005-031-060511- /O.CAN.KBOU.SV.W.0009.000000T0000Z-120506T0530Z/ ARAPAHOE CO-DENVER CO- 1101 PM MDT SAT MAY 5 2012 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DENVER AND NORTH CENTRAL ARAPAHOE COUNTIES IS CANCELLED... LAT...LON 4004 10470 4014 10453 3983 10408 3974 10429 TIME...MOT...LOC 0501Z 253DEG 25KT 3985 10433 $$ COC001-123-060530- /O.CON.KBOU.SV.W.0009.000000T0000Z-120506T0530Z/ ADAMS CO-WELD CO- 1101 PM MDT SAT MAY 5 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM MDT FOR SOUTH CENTRAL WELD AND CENTRAL ADAMS COUNTIES... AT 1101 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER HAIL. THIS STORM WAS LOCATED 20 MILES SOUTHEAST OF KEENESBURG...OR 32 MILES EAST OF DENVER...MOVING EAST AT 30 MPH. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO KEENESBURG. 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 4004 10470 4014 10453 3983 10408 3974 10429 TIME...MOT...LOC 0501Z 253DEG 25KT 3985 10433 WIND...HAIL <50MPH 1.00IN $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 5, 6:32 PM MDT | Tornado Warning | BOU | Logan | 43 min |
| May 5, 7:39 PM MDT | Special Weather Statement | BOU | Weld | 51 min |
| May 5, 8:20 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 25 min |
| May 5, 9:29 PM MDT | Special Weather Statement | BOU | Denver | 46 min |
| May 5, 9:56 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 49 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.