Alert archive / Colorado / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 95, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Sep 26, 2012, 4:33 PM MDT for Larimer County, Weld County, Colorado. It was in force for 33 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
- Sep 26, 2012, 4:33 PM MDT (22:33 UTC)
- Expired
- Sep 26, 2012, 5:06 PM MDT
- In force
- 33 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
Counties Larimer County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 70 km from the middle of the area, began a volume at 22:35 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 12:00Z, 10.6 hours before the alert went out and 155 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
- 26 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 687 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
556 WUUS55 KBOU 262233 SVRBOU COC069-123-262315- /O.NEW.KBOU.SV.W.0095.120926T2233Z-120926T2315Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DENVER CO 433 PM MDT WED SEP 26 2012 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EXTREME SOUTHEASTERN LARIMER COUNTY IN NORTH CENTRAL COLORADO... EXTREME WEST CENTRAL WELD COUNTY IN NORTHEAST COLORADO... * UNTIL 515 PM MDT * AT 426 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR BERTHOUD...OR 16 MILES SOUTHWEST OF GREELEY...AND MOVING NORTH AT 10 MPH. * LOCATIONS IMPACTED INCLUDE... JOHNSTOWN...KELIM AND WELTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH... DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 4025 10490 4027 10507 4046 10503 4046 10484 TIME...MOT...LOC 2226Z 199DEG 7KT 4030 10500 $$ BARJENBRUCH
2 follow-up statements
873 WWUS55 KBOU 262253 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 453 PM MDT WED SEP 26 2012 COC069-123-262315- /O.CON.KBOU.SV.W.0095.000000T0000Z-120926T2315Z/ LARIMER CO-WELD CO- 453 PM MDT WED SEP 26 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MDT FOR EXTREME SOUTHEASTERN LARIMER AND EXTREME WEST CENTRAL WELD COUNTIES... AT 449 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. THE PUBLIC ALSO REPORTED A FUNNEL CLOUD ASSOCIATED WITH THIS STORM NEAR JOHNSTOWN. THIS STORM WAS LOCATED NEAR JOHNSTOWN...OR 13 MILES SOUTHWEST OF GREELEY...MOVING NORTH AT 10 MPH. LOCATIONS IMPACTED INCLUDE... JOHNSTOWN...KELIM AND WELTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MILES PER HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. IF A TORNADO IS SPOTTED...MOVE IMMEDIATELY INDOORS AND TAKE SHELTER IN AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. && LAT...LON 4025 10490 4027 10507 4046 10503 4046 10484 TIME...MOT...LOC 2249Z 199DEG 7KT 4034 10498 $$ BARJENBRUCH
713 WWUS55 KBOU 262306 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 506 PM MDT WED SEP 26 2012 COC069-123-262314- /O.CAN.KBOU.SV.W.0095.000000T0000Z-120926T2315Z/ LARIMER CO-WELD CO- 506 PM MDT WED SEP 26 2012 ...THE SEVERE THUNDERSTORM WARNING FOR EXTREME SOUTHEASTERN LARIMER AND EXTREME WEST CENTRAL WELD COUNTIES IS CANCELLED... THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED. THEREFORE THE WARNING HAS BEEN CANCELLED. THE STORMS WILL STILL PRODUCE HEAVY RAIN AND POSSIBLY SMALL HAIL AS IT MOVES NORTHWARD THROUGH THE FORT COLLINS AND WINDSOR AREAS. MINOR STREET FLOODING CAN BE EXPECTED IN LOW LYING AREAS. LAT...LON 4025 10490 4027 10507 4046 10503 4046 10484 TIME...MOT...LOC 2304Z 199DEG 7KT 4034 10498 $$ BARJENBRUCH
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 26, 5:46 PM MDT | Flash Flood Warning | BOU | Weld | 2 hr |
| Sep 26, 5:57 PM MDT | Areal Flood Advisory | BOU | Weld | 93 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.