Alert archive / Colorado / Tornado Warnings in 2011
Tornado Warning 35, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Aug 19, 2011, 6:07 PM MDT for Morgan County, Weld County, Colorado. It was in force for 23 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
- Aug 19, 2011, 6:07 PM MDT (00:07 UTC)
- Expired
- Aug 19, 2011, 6:30 PM MDT
- In force
- 23 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
Counties Morgan County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 80 km from the middle of the area, began a volume at 00:10 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 |
|---|---|---|---|
| Aug 19, 6:27 PM MDT | HAIL 1 | Orchard, CO | HEAVY RAIN BUT MOSTLY PEA TO MARBLE SIZE HAIL. |
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, 0.1 hours before the alert went out and 96 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
- 33 J/kg
- Mixed-layer CIN
- -149 J/kg
- Mixed-layer LCL
- 2731 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- -24 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
261 WFUS55 KBOU 200007 TORBOU COC087-123-200030- /O.NEW.KBOU.TO.W.0035.110820T0007Z-110820T0030Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DENVER CO 607 PM MDT FRI AUG 19 2011 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * TORNADO WARNING FOR... NORTHWESTERN MORGAN COUNTY IN NORTHEAST COLORADO CENTRAL WELD COUNTY IN NORTHEAST COLORADO * UNTIL 630 PM MDT * AT 607 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 4 MILES NORTHWEST OF ORCHARD...OR 21 MILES NORTHWEST OF FORT MORGAN. THIS STORM WAS MOVING SOUTHEAST AT 10 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WELDONA... RIVERSIDE RESERVOIR...ORCHARD...JACKSON RESERVOIR AND GOODRICH. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 4052 10398 4035 10393 4028 10429 4045 10431 TIME...MOT...LOC 0007Z 238DEG 10KT 4039 10415 $$
2 follow-up statements
604 WWUS55 KBOU 200014 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 614 PM MDT FRI AUG 19 2011 COC087-123-200030- /O.CON.KBOU.TO.W.0035.000000T0000Z-110820T0030Z/ MORGAN CO-WELD CO- 614 PM MDT FRI AUG 19 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM MDT FOR CENTRAL WELD AND NORTHWESTERN MORGAN COUNTIES... AT 614 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS STORM WAS LOCATED 4 MILES WEST OF ORCHARD...OR 21 MILES WEST OF FORT MORGAN. THIS STORM WAS MOVING SOUTHEAST AT 15 MPH. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WELDONA...RIVERSIDE RESERVOIR...ORCHARD...JACKSON RESERVOIR AND GOODRICH. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 4052 10398 4035 10393 4028 10429 4045 10431 TIME...MOT...LOC 0014Z 239DEG 12KT 4036 10417 $$
804 WWUS55 KBOU 200029 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 629 PM MDT FRI AUG 19 2011 COC087-123-200040- /O.EXP.KBOU.TO.W.0035.000000T0000Z-110820T0030Z/ MORGAN CO-WELD CO- 629 PM MDT FRI AUG 19 2011 ...THE TORNADO WARNING FOR CENTRAL WELD AND NORTHWESTERN MORGAN COUNTIES HAS EXPIRED... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS EXITED THE AREA. LAT...LON 4052 10398 4035 10393 4028 10429 4045 10431 TIME...MOT...LOC 0030Z 239DEG 12KT 4039 10411 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 6:28 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 25 min |
| Aug 19, 6:41 PM MDT | Special Weather Statement | BOU | Adams | 34 min |
Nearby
Tornado Warnings in Colorado, 2011Every tornado warning in 2011Tornadoes in 2011
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.