Alert archive / Colorado / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 89, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 30, 2012, 3:12 PM MDT for Douglas County, Colorado. It was in force for 22 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 30, 2012, 3:12 PM MDT (21:12 UTC)
- Expired
- Jul 30, 2012, 3:34 PM MDT
- In force
- 22 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
County Douglas County, CO
The radar
The Denver radar (KFTG), 47 km from the middle of the area, began a volume at 21:13 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, 9.2 hours before the alert went out and 147 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
- 36 J/kg
- Mixed-layer CIN
- -260 J/kg
- Mixed-layer LCL
- 2058 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
752 WUUS55 KBOU 302112 SVRBOU COC035-302145- /O.NEW.KBOU.SV.W.0089.120730T2112Z-120730T2145Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DENVER CO 312 PM MDT MON JUL 30 2012 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHEASTERN DOUGLAS COUNTY IN NORTHEAST COLORADO... * UNTIL 345 PM MDT * AT 309 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL. THIS STORM WAS LOCATED NEAR SEDALIA...OR 24 MILES SOUTH OF DENVER...AND MOVING EAST AT 25 MPH. * LOCATIONS IMPACTED INCLUDE... PARKER...CASTLE ROCK...THE PINERY...FRANKTOWN...BEVERLY HILLS... SURREY RIDGE AND SILVER HEIGHTS. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH... DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 3938 10495 3948 10498 3955 10467 3937 10467 TIME...MOT...LOC 2109Z 265DEG 20KT 3941 10493 $$
1 follow-up statement
395 WWUS55 KBOU 302134 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 333 PM MDT MON JUL 30 2012 COC035-302143- /O.CAN.KBOU.SV.W.0089.000000T0000Z-120730T2145Z/ DOUGLAS CO- 334 PM MDT MON JUL 30 2012 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DOUGLAS COUNTY IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY. THEREFORE THE WARNING HAS BEEN CANCELLED. HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM. LAT...LON 3938 10495 3947 10498 3954 10467 3936 10467 TIME...MOT...LOC 2133Z 265DEG 20KT 3941 10493 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 2:09 PM MDT | Special Weather Statement | BOU | Jefferson | 36 min |
| Jul 30, 2:30 PM MDT | Special Weather Statement | BOU | Grand | 30 min |
| Jul 30, 3:04 PM MDT | Special Weather Statement | BOU | Douglas | 26 min |
| Jul 30, 3:27 PM MDT | Flash Flood Warning | BOU | Boulder | 78 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.