Alert archive / Colorado / Tornado Warnings in 2011
Tornado Warning 25, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jul 2, 2011, 5:05 PM MDT for Washington County, Colorado. It was in force for 25 min. 5 reports 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
- Jul 2, 2011, 5:05 PM MDT (23:05 UTC)
- Expired
- Jul 2, 2011, 5:30 PM MDT
- In force
- 25 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
County Washington County, CO
The radar
The Denver radar (KFTG), 131 km from the middle of the area, began a volume at 23:08 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 |
|---|---|---|---|
| Jul 2, 5:11 PM MDT | TORNADO | Akron, CO | STORM PRODUCING PENNY TO NICKEL SIZE HAIL. |
| Jul 2, 5:22 PM MDT | TSTM WND GST 67 | Akron, CO | AKRON ASOS REPORTED PEAK GUST OF 67 MPH. |
| Jul 2, 5:30 PM MDT | TSTM WND GST 60 | 4 Se Akron, CO | ALSO REPORTED NICKLE SIZE HAIL |
| Jul 2, 5:38 PM MDT | TORNADO | Sw Akron, CO | |
| Jul 2, 5:39 PM MDT | HAIL 0.88 | Platner, CO |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 2, 3:20 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 11.1 hours before the alert went out and 38 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
- 1031 J/kg
- Mixed-layer CIN
- -97 J/kg
- Mixed-layer LCL
- 1074 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.9
The text
As transmitted, in the capitals the NWS used until 2016.
457 WFUS55 KBOU 022305 TORBOU COC121-022330- /O.NEW.KBOU.TO.W.0025.110702T2305Z-110702T2330Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DENVER CO 505 PM MDT SAT JUL 2 2011 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * TORNADO WARNING FOR... CENTRAL WASHINGTON COUNTY IN NORTHEAST COLORADO * UNTIL 530 PM MDT * AT 506 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 4 MILES NORTHEAST OF AKRON. THIS STORM WAS MOVING SOUTH AT 15 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PLATNER AND AKRON. 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 4028 10300 4008 10301 4008 10325 4028 10324 TIME...MOT...LOC 2306Z 268DEG 11KT 4019 10313 $$
2 follow-up statements
701 WWUS55 KBOU 022312 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 512 PM MDT SAT JUL 2 2011 COC121-022330- /O.CON.KBOU.TO.W.0025.000000T0000Z-110702T2330Z/ WASHINGTON CO- 512 PM MDT SAT JUL 2 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM MDT FOR CENTRAL WASHINGTON COUNTY... AT 512 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS STORM WAS LOCATED 4 MILES NORTHEAST OF AKRON. THIS STORM WAS MOVING SOUTHEAST AT 15 MPH. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PLATNER AND AKRON. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 4028 10300 4008 10301 4008 10325 4028 10324 TIME...MOT...LOC 2312Z 265DEG 7KT 4019 10314 $$
024 WWUS55 KBOU 022332 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 532 PM MDT SAT JUL 2 2011 COC121-022342- /O.EXP.KBOU.TO.W.0025.000000T0000Z-110702T2330Z/ WASHINGTON CO- 532 PM MDT SAT JUL 2 2011 ...THE TORNADO WARNING FOR CENTRAL WASHINGTON COUNTY HAS EXPIRED... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS EXITED THE AREA. LAT...LON 4028 10300 4008 10301 4008 10325 4028 10324 TIME...MOT...LOC 2312Z 265DEG 7KT 4019 10314 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 2, 12:17 AM MDT | Severe Thunderstorm Warning | BOU | Larimer | 43 min |
| Jul 2, 1:23 AM MDT | Severe Thunderstorm Warning | BOU | Lincoln, Washington | 52 min |
| Jul 2, 12:16 PM MDT | Areal Flood Advisory | BOU | Jackson | 71 hr |
| Jul 2, 2:14 PM MDT | Special Weather Statement | BOU | Jefferson | 31 min |
| Jul 2, 3:18 PM MDT | Special Weather Statement | BOU | Douglas | 27 min |
| Jul 2, 3:46 PM MDT | Special Weather Statement | BOU | Logan | 29 min |
| Jul 2, 3:52 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 38 min |
| Jul 2, 3:54 PM MDT | Special Weather Statement | BOU | Elbert | 36 min |
| Jul 2, 4:22 PM MDT | Special Weather Statement | BOU | Morgan | 23 min |
| Jul 2, 4:27 PM MDT | Special Weather Statement | BOU | Adams | 33 min |
| Jul 2, 4:45 PM MDT | Severe Thunderstorm Warning | BOU | Adams | 30 min |
| Jul 2, 5:16 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan, Washington | 59 min |
| Jul 2, 5:31 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 44 min |
| Jul 2, 5:44 PM MDT | Tornado Warning | BOU | Washington | 31 min |
| Jul 2, 5:49 PM MDT | Special Weather Statement | BOU | Lincoln | 26 min |
| Jul 2, 5:58 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 62 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.