Alert archive / Colorado / Tornado Warnings in 2011
Tornado Warning 11, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at May 30, 2011, 2:24 PM MDT for Weld County, Colorado. It was in force for 36 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
- May 30, 2011, 2:24 PM MDT (20:24 UTC)
- Expired
- May 30, 2011, 3:00 PM MDT
- In force
- 36 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
County Weld County, CO
The radar
The Denver radar (KFTG), 47 km from the middle of the area, began a volume at 20:27 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 |
|---|---|---|---|
| May 30, 2:26 PM MDT | HAIL 1.25 | Keenesburg, CO |
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 12:00Z, 8.4 hours before the alert went out and 105 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
- 19 J/kg
- Mixed-layer CIN
- -134 J/kg
- Mixed-layer LCL
- 1603 m above ground
- 0-6 km bulk shear
- 75 kt
- 0-1 km storm-relative helicity
- 64 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
192 WFUS55 KBOU 302024 TORBOU COC123-302100- /O.NEW.KBOU.TO.W.0011.110530T2024Z-110530T2100Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DENVER CO 224 PM MDT MON MAY 30 2011 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * TORNADO WARNING FOR... SOUTH CENTRAL WELD COUNTY IN NORTHEAST COLORADO * UNTIL 300 PM MDT * AT 224 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 2 MILES NORTHWEST OF PROSPECT VALLEY...OR 27 MILES SOUTHEAST OF GREELEY. THIS STORM WAS MOVING NORTHEAST AT 15 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROGGEN... PROSPECT VALLEY AND KEENESBURG. 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 4031 10448 4031 10416 4001 10418 4001 10467 TIME...MOT...LOC 2024Z 211DEG 25KT 4010 10443 $$
3 follow-up statements
388 WWUS55 KBOU 302030 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 230 PM MDT MON MAY 30 2011 COC123-302100- /O.CON.KBOU.TO.W.0011.000000T0000Z-110530T2100Z/ WELD CO- 230 PM MDT MON MAY 30 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 300 PM MDT FOR SOUTH CENTRAL WELD COUNTY... AT 231 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS STORM WAS LOCATED 3 MILES EAST OF PROSPECT VALLEY...OR 30 MILES SOUTHEAST OF GREELEY. THIS STORM WAS MOVING NORTHEAST AT 15 MPH. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROGGEN...PROSPECT VALLEY AND KEENESBURG. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 4031 10448 4031 10416 4001 10418 4001 10455 TIME...MOT...LOC 2031Z 211DEG 25KT 4009 10436 $$
592 WWUS55 KBOU 302041 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 241 PM MDT MON MAY 30 2011 COC123-302100- /O.CON.KBOU.TO.W.0011.000000T0000Z-110530T2100Z/ WELD CO- 241 PM MDT MON MAY 30 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 300 PM MDT FOR SOUTH CENTRAL WELD COUNTY... AT 241 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS STORM WAS LOCATED NEAR ROGGEN...OR 24 MILES SOUTHEAST OF GREELEY. THIS STORM WAS MOVING NORTHEAST AT 15 MPH. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROGGEN...PROSPECT VALLEY AND KEENESBURG. 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 4031 10448 4031 10416 4001 10418 4001 10455 TIME...MOT...LOC 2041Z 211DEG 25KT 4020 10438 $$
902 WWUS55 KBOU 302056 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 256 PM MDT MON MAY 30 2011 COC123-302107- /O.EXP.KBOU.TO.W.0011.000000T0000Z-110530T2100Z/ WELD CO- 256 PM MDT MON MAY 30 2011 ...THE TORNADO WARNING FOR SOUTH CENTRAL WELD COUNTY WILL EXPIRE AT 300 PM MDT... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND IS NO LONGER EXPECTED TO PRODUCE SEVERE WEATHER. LAT...LON 4031 10448 4031 10416 4001 10418 4001 10455 TIME...MOT...LOC 2057Z 211DEG 25KT 4030 10431 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 9:42 PM MDT | Areal Flood Advisory | BOU | Grand | 4 days |
| May 30, 1:12 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 20 min |
| May 30, 2:02 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 28 min |
| May 30, 2:20 PM MDT | Tornado Warning | BOU | Weld | 25 min |
| May 30, 2:32 PM MDT | Severe Thunderstorm Warning | BOU | Adams | 28 min |
| May 30, 2:49 PM MDT | Tornado Warning | BOU | Adams | 26 min |
| May 30, 3:00 PM MDT | Tornado Warning | BOU | Adams, Morgan, Weld | 30 min |
| May 30, 3:34 PM MDT | Special Weather Statement | BOU | Morgan | 41 min |
| May 30, 3:35 PM MDT | Special Weather Statement | BOU | Logan | 40 min |
| May 30, 3:53 PM MDT | Tornado Warning | BOU | Washington | 22 min |
| May 30, 3:59 PM MDT | Special Weather Statement | BOU | Logan | 46 min |
| May 30, 4:32 PM MDT | Special Weather Statement | BOU | Phillips, Sedgwick | 28 min |
| May 30, 5:00 PM MDT | Special Weather Statement | BOU | Phillips, Sedgwick | 30 min |
| May 30, 5:04 PM MDT | Severe Thunderstorm Warning | BOU | Sedgwick | 22 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.