Alert archive / Colorado / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 39, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 7, 2017, 5:31 PM MDT for Logan 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
- Jun 7, 2017, 5:31 PM MDT (23:31 UTC)
- Expired
- Jun 7, 2017, 6:15 PM MDT
- In force
- 44 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
County Logan County, CO
The radar
The Cheyenne radar (KCYS), 145 km from the middle of the area, began a volume at 23:31 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, 11.5 hours before the alert went out and 90 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
- 1579 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
120
WUUS55 KBOU 072331
SVRBOU
COC075-080015-
/O.NEW.KBOU.SV.W.0039.170607T2331Z-170608T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
531 PM MDT WED JUN 7 2017
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
Central Logan County in northeastern Colorado...
* Until 615 PM MDT
* At 530 PM MDT, a severe thunderstorm was located near Padroni, or 6
miles north of Sterling, moving south at 15 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect
wind damage to roofs, siding, and trees.
* Locations impacted include...
Sterling, Padroni and Atwood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.
&&
LAT...LON 4078 10327 4079 10314 4059 10299 4054 10315
4058 10335
TIME...MOT...LOC 2330Z 349DEG 13KT 4075 10321
HAIL...1.50IN
WIND...60MPH
$$
GIMMESTAD2 follow-up statements
683
WWUS55 KBOU 080004
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
604 PM MDT WED JUN 7 2017
COC075-080015-
/O.CON.KBOU.SV.W.0039.000000T0000Z-170608T0015Z/
Logan CO-
604 PM MDT WED JUN 7 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MDT
FOR SOUTH CENTRAL LOGAN COUNTY...
At 603 PM MDT, a severe thunderstorm was located 5 miles northeast of
Atwood, or 5 miles south of Sterling, moving south at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Southeastern Sterling.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4060 10322 4065 10311 4057 10304 4054 10315
4056 10324
TIME...MOT...LOC 0003Z 351DEG 14KT 4058 10318
HAIL...1.00IN
WIND...60MPH
$$
GIMMESTAD848
WWUS55 KBOU 080020
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
620 PM MDT WED JUN 7 2017
COC075-080030-
/O.EXP.KBOU.SV.W.0039.000000T0000Z-170608T0015Z/
Logan CO-
620 PM MDT WED JUN 7 2017
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL LOGAN COUNTY HAS
EXPIRED...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore the warning has
been allowed to expire.
LAT...LON 4060 10322 4065 10311 4057 10304 4054 10315
4056 10324
TIME...MOT...LOC 0020Z 349DEG 13KT 4052 10317
$$
GIMMESTADThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 6, 8:19 PM MDT | Special Weather Statement | BOU | Lincoln | 41 min |
| Jun 7, 2:39 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 31 min |
| Jun 7, 3:08 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 52 min |
| Jun 7, 3:21 PM MDT | Special Weather Statement | BOU | Denver | 39 min |
| Jun 7, 3:36 PM MDT | Special Weather Statement | BOU | Boulder | 24 min |
| Jun 7, 4:06 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 54 min |
| Jun 7, 4:32 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 58 min |
| Jun 7, 4:52 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 21 min |
| Jun 7, 4:57 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 48 min |
| Jun 7, 5:04 PM MDT | Special Weather Statement | BOU | Adams | 41 min |
| Jun 7, 5:37 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 53 min |
| Jun 7, 5:43 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 47 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2017Every severe thunderstorm warning in 2017
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.