Alert archive / Colorado / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 91, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 31, 2012, 2:51 PM MDT for Douglas County, Elbert 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
- Jul 31, 2012, 2:51 PM MDT (20:51 UTC)
- Expired
- Jul 31, 2012, 3:20 PM MDT
- In force
- 29 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 70.0 mph
Counties Douglas County, CO, Elbert County, CO
The radar
The Denver radar (KFTG), 40 km from the middle of the area, began a volume at 20:52 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, 8.9 hours before the alert went out and 117 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
- 26 J/kg
- Mixed-layer CIN
- -414 J/kg
- Mixed-layer LCL
- 2225 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
196
WUUS55 KBOU 312051
SVRBOU
COC035-039-312130-
/O.NEW.KBOU.SV.W.0091.120731T2051Z-120731T2130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
251 PM MDT TUE JUL 31 2012
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHWESTERN ELBERT COUNTY IN EAST CENTRAL COLORADO
NORTHEASTERN DOUGLAS COUNTY IN NORTHEAST COLORADO
* UNTIL 330 PM MDT
* AT 251 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER HAIL...
AND DESTRUCTIVE WINDS UP TO ABOUT 70 MPH. THIS STORM WAS LOCATED
NEAR THE PINERY...OR 23 MILES SOUTHEAST OF DENVER...MOVING EAST AT
30 MPH.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO THE
PINERY...PONDEROSA PARK...PARKER...KIOWA...FRANKTOWN AND ELIZABETH.
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 3956 10422 3928 10429 3927 10453 3936 10479
3956 10479
TIME...MOT...LOC 2051Z 268DEG 26KT 3945 10471
WIND...HAIL 70MPH 1.00IN
$$1 follow-up statement
033
WWUS55 KBOU 312120
SVSBOU
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
320 PM MDT TUE JUL 31 2012
COC035-039-312130-
/O.CAN.KBOU.SV.W.0091.000000T0000Z-120731T2130Z/
ELBERT CO-DOUGLAS CO-
320 PM MDT TUE JUL 31 2012
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DOUGLAS AND
NORTHWESTERN ELBERT COUNTIES IS CANCELLED...
THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND IS NO
LONGER EXPECTED TO PRODUCE SEVERE WEATHER. HEAVY RAIN...PEA SIZED
HAIL AND WIND GUSTS TO 50 MPH ARE STILL POSSIBLE WITH THIS STORM.
LAT...LON 3956 10422 3928 10429 3927 10453 3936 10479
3956 10479
TIME...MOT...LOC 2120Z 268DEG 26KT 3946 10444
$$The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 6:18 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 27 min |
| Jul 31, 1:03 PM MDT | Special Weather Statement | BOU | Broomfield | 27 min |
| Jul 31, 1:39 PM MDT | Special Weather Statement | BOU | Denver | 51 min |
| Jul 31, 2:13 PM MDT | Special Weather Statement | BOU | Denver | 32 min |
| Jul 31, 3:28 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert | 31 min |
| Jul 31, 4:43 PM MDT | Special Weather Statement | BOU | Lincoln | 47 min |
| Jul 31, 5:39 PM MDT | Special Weather Statement | BOU | Lincoln | 36 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2012Every severe thunderstorm warning in 2012
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.