Alert archive / Colorado / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 252, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 17, 2009, 6:46 PM MDT for Arapahoe County, Colorado. It was in force for 29 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
- Aug 17, 2009, 6:46 PM MDT (00:46 UTC)
- Expired
- Aug 17, 2009, 7:15 PM MDT
- In force
- 29 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
County Arapahoe County, CO
The radar
The Denver radar (KFTG), 18 km from the middle of the area, began a volume at 00:48 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 00:00Z, 0.8 hours before the alert went out and 102 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
- 395 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 1610 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KBOU 180046 SVRBOU COC005-180115- /O.NEW.KBOU.SV.W.0252.090818T0046Z-090818T0115Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DENVER CO 646 PM MDT MON AUG 17 2009 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL ARAPAHOE COUNTY IN NORTHEAST COLORADO * UNTIL 715 PM MDT * AT 646 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL. THIS STORM WAS LOCATED 12 MILES SOUTHWEST OF STRASBURG...OR 26 MILES EAST OF DENVER...MOVING NORTHEAST AT 15 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO STRASBURG. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN. && LAT...LON 3974 10428 3957 10426 3957 10459 3973 10458 TIME...MOT...LOC 0046Z 241DEG 19KT 3963 10448 $$
2 follow-up statements
000 WWUS55 KBOU 180052 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 652 PM MDT MON AUG 17 2009 COC005-180115- /O.CON.KBOU.SV.W.0252.000000T0000Z-090818T0115Z/ ARAPAHOE CO- 652 PM MDT MON AUG 17 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM MDT FOR CENTRAL ARAPAHOE COUNTY... AT 652 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL. THIS STORM WAS LOCATED 11 MILES SOUTHWEST OF STRASBURG...OR 27 MILES EAST OF DENVER...MOVING NORTHEAST AT 15 MPH. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO STRASBURG AND EASTERN AURORA. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN. && LAT...LON 3974 10428 3957 10426 3957 10459 3973 10458 TIME...MOT...LOC 0052Z 241DEG 19KT 3965 10447 $$
000 WWUS55 KBOU 180115 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 715 PM MDT MON AUG 17 2009 COC005-180126- /O.EXP.KBOU.SV.W.0252.000000T0000Z-090818T0115Z/ ARAPAHOE CO- 715 PM MDT MON AUG 17 2009 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL ARAPAHOE COUNTY HAS EXPIRED... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS EXITED THE AREA. LAT...LON 3974 10428 3957 10426 3957 10459 3973 10458 TIME...MOT...LOC 0052Z 241DEG 19KT 3965 10447 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 6:03 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe | 27 min |
| Aug 17, 6:07 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 38 min |
| Aug 17, 6:23 PM MDT | Tornado Warning | BOU | Elbert | 37 min |
| Aug 17, 6:27 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 48 min |
| Aug 17, 6:32 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 43 min |
| Aug 17, 6:59 PM MDT | Tornado Warning | BOU | Elbert, Lincoln | 31 min |
| Aug 17, 7:14 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Washington | 46 min |
| Aug 17, 7:28 PM MDT | Tornado Warning | BOU | Lincoln | 32 min |
| Aug 17, 7:45 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert | 45 min |
| Aug 17, 7:55 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Washington | 27 min |
| Aug 17, 7:59 PM MDT | Tornado Warning | BOU | Lincoln | 46 min |
| Aug 17, 8:15 PM MDT | Flash Flood Warning | BOU | Lincoln | 3 hr |
| Aug 17, 8:44 PM MDT | Tornado Warning | BOU | Lincoln | 31 min |
| Aug 17, 9:15 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 29 min |
| Aug 17, 9:27 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 48 min |
| Aug 17, 10:00 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 30 min |
| Aug 17, 10:21 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 29 min |
| Aug 18, 2:07 AM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 53 min |
| Aug 18, 12:39 PM MDT | Severe Thunderstorm Warning | BOU | Denver, Jefferson | 36 min |
| Aug 18, 1:10 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver, Douglas, Jefferson | 22 min |
| Aug 18, 1:16 PM MDT | Tornado Warning | BOU | Park | 24 min |
| Aug 18, 3:31 PM MDT | Special Weather Statement | BOU | Elbert | 44 min |
| Aug 18, 4:22 PM MDT | Special Weather Statement | BOU | Lincoln | 53 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2009Every severe thunderstorm warning in 2009
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.