Alert archive / Colorado / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 8, NWS Grand Junction, CO
NWS Grand Junction, CO issued this severe thunderstorm warning at Jul 28, 2018, 6:14 PM MDT for Delta County, Mesa County, Colorado. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 28, 2018, 6:14 PM MDT (00:14 UTC)
- Expired
- Jul 28, 2018, 6:45 PM MDT
- In force
- 31 min
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Delta County, CO, Mesa County, CO
The radar
The Grand Junction radar (KGJX), 14 km from the middle of the area, began a volume at 00:14 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 00:00Z, 0.2 hours before the alert went out and 436 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
- 863 J/kg
- Mixed-layer CIN
- -114 J/kg
- Mixed-layer LCL
- 1825 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 167 m²/s²
- 0-3 km storm-relative helicity
- 331 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 6.4
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Junction, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 28, 5:52 PM MDT, 22 minutes earlier.
Area forecast discussion, Jul 28, 5:52 PM MDT, 22 minutes before
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</html>Hazardous weather outlook, Jul 28, 5:51 AM MDT, 12 hours 23 minutes before
Hazardous Weather Outlook National Weather Service Grand Junction CO 551 AM MDT Sat Jul 28 2018 COZ001>014-017>023-UTZ022>025-027>029-291200- Lower Yampa River Basin-Central Yampa River Basin- Roan and Tavaputs Plateaus-Elkhead and Park Mountains- Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor- Central Colorado River Basin-Grand and Battlement Mesas- Gore and Elk Mountains/Central Mountain Valleys- Central Gunnison and Uncompahgre River Basin- West Elk and Sawatch Mountains-Flat Tops- Upper Gunnison River Valley-Uncompahgre Plateau and Dallas Divide- Northwest San Juan Mountains-Southwest San Juan Mountains- Paradox Valley/Lower Dolores River- Four Corners/Upper Dolores River-Animas River Basin- San Juan River Basin-Southeast Utah-Eastern Uinta Mountains- Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat- La Sal and Abajo Mountains-Canyonlands/Natural Bridges- 551 AM MDT Sat Jul 28 2018 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight More convection is expected today as daytime heating, moisture, and the jet stream aloft all aid in convective development. Gusty winds from any convection may reach 40 to 50 mph this afternoon and evening. Most storms and showers will die down shortly after sunset though a few may linger past then. .DAYS TWO THROUGH SEVEN...Sunday through Friday Dry conditions will move in Sunday through Wednesday causing a noticeable decrease in convection across the area. Even so, some showers and storms will likely fire over higher terrain. Coverage will be much less than we've seen lately. Moisture starts increasing Wednesday onwards which will cause convection to increase as well. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
In the hours before
Local storm report, Jul 28, 1:44 PM MDT, 4 hours 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
144 PM MDT SAT JUL 28 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1254 PM HEAVY RAIN 1 NE EL JEBEL 39.41N 107.08W
07/28/2018 M0.24 INCH EAGLE CO MESONET
IRAWS STATION MEASURED 0.24 OF AN INCH OF
RAIN AND SMALL HAIL BETWEEN 12:03 AND 12:18
PM MDT. FLOWING WATER UP TO 6 INCHES DEEP
RAN ACROSS A USFS ROAD AS OF 12:54 PM MDT.
&&
JRPLocal storm report, Jul 28, 1:46 PM MDT, 4 hours 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
146 PM MDT SAT JUL 28 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0139 PM HAIL MEEKER 40.05N 107.89W
07/28/2018 M0.25 INCH RIO BLANCO CO NWS EMPLOYEE
&&
JPFLocal storm report, Jul 28, 4:25 PM MDT, 1 hour 49 minutes before
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</html>Local storm report, Jul 28, 4:26 PM MDT, 1 hour 48 minutes before
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</html>Special weather statement, Jul 28, 4:52 PM MDT, 1 hour 22 minutes before
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</html>Local storm report, Jul 28, 6:13 PM MDT, 1 minute before
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</html>The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 3:04 AM MDT | Red Flag Warning | GJT | Moffat, Rio Blanco | 17 hr |
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.