Alert archive / Colorado / Tornado Warnings in 2010
Tornado Warning 21, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at May 18, 2010, 5:46 PM MDT for Weld County, Colorado. It was in force for 44 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 18, 2010, 5:46 PM MDT (23:46 UTC)
- Expired
- May 18, 2010, 6:30 PM MDT
- In force
- 44 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
County Weld County, CO
The radar
The Cheyenne radar (KCYS), 36 km from the middle of the area, began a volume at 23:47 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 18, 12:41 PM MDT | Tornado Watch | SPC | 10 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 11.8 hours before the alert went out and 162 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
- 482 J/kg
- Mixed-layer CIN
- -196 J/kg
- Mixed-layer LCL
- 1137 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
063 WFUS55 KBOU 182346 TORBOU COC123-190030- /O.NEW.KBOU.TO.W.0021.100518T2346Z-100519T0030Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DENVER CO 546 PM MDT TUE MAY 18 2010 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * TORNADO WARNING FOR... NORTH CENTRAL WELD COUNTY IN NORTHEAST COLORADO * UNTIL 630 PM MDT * AT 546 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES NORTHEAST OF NUNN...OR 25 MILES NORTH OF GREELEY. THIS STORM WAS MOVING NORTHEAST AT 15 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROCKPORT... NUNN AND CARR. THIS TORNADO WARNING REPLACES THE TORNADO WARNING THAT WAS IN EFFECT FOR NORTHWEST WELD COUNTY UNTIL 545 PM MDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. AS A LAST RESORT...EITHER PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR VEHICLE AND LIE DOWN IN A LOW LYING AREA. && LAT...LON 4099 10444 4064 10451 4065 10489 4100 10489 TIME...MOT...LOC 2346Z 225DEG 13KT 4078 10468 $$
2 follow-up statements
294 WWUS55 KBOU 190009 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 609 PM MDT TUE MAY 18 2010 COC123-190030- /O.CON.KBOU.TO.W.0021.000000T0000Z-100519T0030Z/ WELD CO- 609 PM MDT TUE MAY 18 2010 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM MDT FOR NORTH CENTRAL WELD COUNTY... AT 607 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM CAPABLE OF PRODUCING A TORNADO LOCATED 9 MILES SOUTHEAST OF ROCKPORT...OR 30 MILES NORTH OF GREELEY. THIS STORM WAS MOVING NORTHEAST AT 15 MPH. TRAINED WEATHER SPOTTERS HAVE REPORTED FUNNEL CLOUDS WITH THESE THUNDERSTORMS. LARGE HAIL AND HEAVY RAINS WILL ALSO BE POSSIBLE AS THE STORM MOVES OVER NORTHWEST WELD COUNTY. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROCKPORT...NUNN AND CARR. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. AS A LAST RESORT...EITHER PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR VEHICLE AND LIE DOWN IN A LOW LYING AREA. A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM MDT TUESDAY EVENING FOR NORTHEASTERN COLORADO. && LAT...LON 4099 10444 4064 10451 4065 10489 4100 10489 TIME...MOT...LOC 0007Z 215DEG 15KT 4086 10462 $$
436 WWUS55 KBOU 190026 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 626 PM MDT TUE MAY 18 2010 COC123-190034- /O.EXP.KBOU.TO.W.0021.000000T0000Z-100519T0030Z/ WELD CO- 626 PM MDT TUE MAY 18 2010 ...THE TORNADO WARNING FOR NORTH CENTRAL WELD COUNTY WILL EXPIRE AT 630 PM MDT... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND IS NO LONGER EXPECTED TO PRODUCE SEVERE WEATHER. SCATTERED THUNDERSTORMS OVER THE NORTHWEST WELD COUNTY WILL CONTINUE THROUGH 700 PM MDT WITH THE POTENTIAL TO PRODUCE PERIODS OF HEAVY RAIN AND SMALL HAIL. A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM MDT TUESDAY EVENING FOR NORTHEASTERN COLORADO. LAT...LON 4099 10444 4064 10451 4065 10489 4100 10489 TIME...MOT...LOC 0024Z 225DEG 18KT 4092 10454 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 3:36 PM MDT | Tornado Warning | BOU | Weld | 24 min |
| May 18, 3:51 PM MDT | Tornado Warning | BOU | Logan, Weld | 39 min |
| May 18, 4:03 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver, Weld | 42 min |
| May 18, 5:18 PM MDT | Tornado Warning | BOU | Weld | 27 min |
| May 18, 5:28 PM MDT | Tornado Warning | BOU | Weld | 36 min |
Nearby
Tornado Warnings in Colorado, 2010Every tornado warning in 2010Tornadoes in 2010
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.