Alert archive / Colorado / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 13, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 13, 2018, 4:10 PM MDT for Adams County, Arapahoe County, Colorado. It was in force for 35 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 13, 2018, 4:10 PM MDT (22:10 UTC)
- Expired
- May 13, 2018, 4:45 PM MDT
- In force
- 35 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Adams County, CO, Arapahoe County, CO
The radar
The Denver radar (KFTG), 59 km from the middle of the area, began a volume at 22:13 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 (KDEN), launched 12:00Z, 10.2 hours before the alert went out and 59 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 643 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
939
WUUS55 KBOU 132210
SVRBOU
COC001-005-132245-
/O.NEW.KBOU.SV.W.0013.180513T2210Z-180513T2245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
410 PM MDT SUN MAY 13 2018
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
Eastern Arapahoe County in northeastern Colorado...
Southeastern Adams County in northeastern Colorado...
* Until 445 PM MDT.
* At 410 PM MDT, a severe thunderstorm was located 5 miles northeast
of Deer Trail, or 30 miles northwest of Limon, moving northeast at
15 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* Locations impacted include...
Cottonwood Valley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3971 10406 3984 10374 3970 10371 3959 10371
3957 10386 3957 10398
TIME...MOT...LOC 2210Z 231DEG 15KT 3966 10396
HAIL...1.00IN
WIND...<50MPH
$$
BOWEN1 follow-up statement
644
WWUS55 KBOU 132234
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
434 PM MDT SUN MAY 13 2018
COC001-005-132245-
/O.CON.KBOU.SV.W.0013.000000T0000Z-180513T2245Z/
Arapahoe CO-Adams CO-
434 PM MDT SUN MAY 13 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM MDT
FOR NORTHEASTERN ARAPAHOE AND SOUTHEASTERN ADAMS COUNTIES...
At 434 PM MDT, a severe thunderstorm was located 6 miles northwest of
Cottonwood Valley, or 32 miles north of Limon, moving northeast at 15
mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
Locations impacted include...
Cottonwood Valley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3975 10394 3984 10374 3970 10371 3967 10373
3964 10379 3962 10384
TIME...MOT...LOC 2234Z 231DEG 15KT 3972 10386
HAIL...1.00IN
WIND...<50MPH
$$
BOWENThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 7:10 PM MDT | Special Weather Statement | BOU | Broomfield | 35 min |
| May 13, 12:22 AM MDT | Dense Fog Advisory | BOU | Arapahoe, Boulder, Clear Creek, Douglas, Elbert, Gilpin and 4 more | 9 hr |
| May 13, 4:00 PM MDT | Special Weather Statement | BOU | Arapahoe | 30 min |
| May 13, 4:40 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Washington | 20 min |
| May 13, 4:41 PM MDT | Special Weather Statement | BOU | Boulder | 49 min |
| May 13, 5:16 PM MDT | Special Weather Statement | BOU | Weld | 29 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2018Every severe thunderstorm warning in 2018
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.