Alert archive / Colorado / Tornado Warnings in 2011
Tornado Warning 13, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at May 30, 2011, 3:00 PM MDT for Adams County, Morgan County, Weld County, Colorado. It was in force for 30 min. 3 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
- May 30, 2011, 3:00 PM MDT (21:00 UTC)
- Expired
- May 30, 2011, 3:30 PM MDT
- In force
- 30 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
Counties Adams County, CO, Morgan County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 51 km from the middle of the area, began a volume at 21:00 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, 3:15 PM MDT | HAIL 0.75 | 12 Se Roggen, CO | |
| May 30, 3:18 PM MDT | HAIL 0.75 | 15 Se Roggen, CO | |
| May 30, 3:22 PM MDT | HAIL 0.75 | 18 Se Roggen, 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, 9.0 hours before the alert went out and 76 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.
213 WFUS55 KBOU 302100 TORBOU COC001-087-123-302130- /O.NEW.KBOU.TO.W.0013.110530T2100Z-110530T2130Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DENVER CO 300 PM MDT MON MAY 30 2011 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * TORNADO WARNING FOR... SOUTHWESTERN MORGAN COUNTY IN NORTHEAST COLORADO NORTH CENTRAL ADAMS COUNTY IN NORTHEAST COLORADO SOUTH CENTRAL WELD COUNTY IN NORTHEAST COLORADO * UNTIL 330 PM MDT * AT 300 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO 9 MILES SOUTHWEST OF HOYT...OR 31 MILES SOUTHWEST OF FORT MORGAN. THIS STORM WAS MOVING NORTHEAST AT 20 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HOYT. 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 4020 10395 3997 10387 3992 10429 4009 10433 TIME...MOT...LOC 2100Z 231DEG 22KT 3998 10419 $$
3 follow-up statements
510 WWUS55 KBOU 302104 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 304 PM MDT MON MAY 30 2011 COC001-087-123-302130- /O.CON.KBOU.TO.W.0013.000000T0000Z-110530T2130Z/ MORGAN CO-ADAMS CO-WELD CO- 304 PM MDT MON MAY 30 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 330 PM MDT FOR EXTREME SOUTH CENTRAL WELD...NORTH CENTRAL ADAMS AND SOUTHWESTERN MORGAN COUNTIES... AT 304 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A TORNADO. THIS STORM WAS LOCATED 8 MILES SOUTHWEST OF HOYT...OR 30 MILES SOUTHWEST OF FORT MORGAN. THIS STORM WAS MOVING NORTHEAST AT 20 MPH. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HOYT AND ADENA. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 4020 10395 3997 10387 3992 10429 4009 10433 TIME...MOT...LOC 2104Z 231DEG 22KT 3999 10417 $$
317 WWUS55 KBOU 302112 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 312 PM MDT MON MAY 30 2011 COC001-087-123-302130- /O.CON.KBOU.TO.W.0013.000000T0000Z-110530T2130Z/ MORGAN CO-ADAMS CO-WELD CO- 312 PM MDT MON MAY 30 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 330 PM MDT FOR EXTREME SOUTH CENTRAL WELD...NORTH CENTRAL ADAMS AND SOUTHWESTERN MORGAN COUNTIES... AT 312 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS STORM WAS LOCATED 7 MILES WEST OF HOYT...OR 26 MILES SOUTHWEST OF FORT MORGAN. THIS STORM WAS MOVING NORTHEAST AT 20 MPH. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HOYT AND ADENA. 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 4020 10395 3997 10387 3992 10429 4009 10433 TIME...MOT...LOC 2112Z 201DEG 20KT 4005 10419 $$
969 WWUS55 KBOU 302131 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 331 PM MDT MON MAY 30 2011 COC001-087-123-302140- /O.EXP.KBOU.TO.W.0013.000000T0000Z-110530T2130Z/ MORGAN CO-ADAMS CO-WELD CO- 331 PM MDT MON MAY 30 2011 ...THE TORNADO WARNING FOR EXTREME SOUTH CENTRAL WELD...NORTH CENTRAL ADAMS AND SOUTHWESTERN MORGAN COUNTIES HAS EXPIRED... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED...HOWEVER RESIDENTS OVER SOUTHWESTERN MORGAN COUNTY SHOULD BE PREPARED FOR WIND GUSTS TO 50 MPH...HAIL TO PENNY SIZE AND HEAVY RAIN UP TO ONE HALF INCH IN 30 MINUTES. LAT...LON 4020 10395 3997 10387 3992 10429 4009 10433 TIME...MOT...LOC 2130Z 201DEG 20KT 4014 10414 $$
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, 3:34 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.