Alert archive / Colorado / Tornado Warnings in 2011
Tornado Warning 14, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at May 30, 2011, 3:53 PM MDT for Washington County, Colorado. It was in force for 22 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 30, 2011, 3:53 PM MDT (21:53 UTC)
- Expired
- May 30, 2011, 4:15 PM MDT
- In force
- 22 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
County Washington County, CO
The radar
The Denver radar (KFTG), 125 km from the middle of the area, began a volume at 21:55 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, 9.9 hours before the alert went out and 53 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.
051 WFUS55 KBOU 302153 TORBOU COC121-302230- /O.NEW.KBOU.TO.W.0014.110530T2153Z-110530T2230Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DENVER CO 353 PM MDT MON MAY 30 2011 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * TORNADO WARNING FOR... NORTH CENTRAL WASHINGTON COUNTY IN NORTHEAST COLORADO * UNTIL 430 PM MDT * AT 353 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 5 MILES SOUTH OF PREWITT RESERVOIR...OR 15 MILES NORTHWEST OF AKRON. THIS STORM WAS MOVING NORTH AT 15 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PREWITT RESERVOIR AND MIDWAY. 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 4043 10315 4024 10314 4022 10345 4043 10346 TIME...MOT...LOC 2153Z 206DEG 32KT 4037 10333 $$
2 follow-up statements
291 WWUS55 KBOU 302200 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 400 PM MDT MON MAY 30 2011 COC121-302230- /O.CON.KBOU.TO.W.0014.000000T0000Z-110530T2230Z/ WASHINGTON CO- 400 PM MDT MON MAY 30 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM MDT FOR NORTH CENTRAL WASHINGTON COUNTY... AT 400 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS STORM WAS LOCATED 7 MILES NORTHEAST OF FREMONT BUTTE...OR 12 MILES NORTH OF AKRON. THIS STORM WAS MOVING NORTH AT 15 MPH. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PREWITT RESERVOIR AND MIDWAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 4043 10315 4024 10314 4022 10345 4043 10346 TIME...MOT...LOC 2200Z 242DEG 35KT 4036 10318 $$
130 WWUS55 KBOU 302215 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 415 PM MDT MON MAY 30 2011 COC121-302226- /O.CAN.KBOU.TO.W.0014.000000T0000Z-110530T2230Z/ WASHINGTON CO- 415 PM MDT MON MAY 30 2011 ...THE TORNADO WARNING FOR NORTH CENTRAL WASHINGTON COUNTY IS CANCELLED... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND IS NO LONGER EXPECTED TO PRODUCE SEVERE WEATHER. LAT...LON 4043 10315 4024 10314 4022 10345 4043 10346 TIME...MOT...LOC 2216Z 242DEG 35KT 4043 10300 $$
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, 2:24 PM MDT | Tornado Warning | BOU | Weld | 36 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, 3:59 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.