Alert archive / Colorado / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 21, NWS Grand Junction, CO
NWS Grand Junction, CO issued this severe thunderstorm warning at Sep 5, 2007, 5:50 PM MDT for Routt County, Colorado. It was in force for 25 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
- Sep 5, 2007, 5:50 PM MDT (23:50 UTC)
- Expired
- Sep 5, 2007, 6:15 PM MDT
- In force
- 25 min
- Issued by
- NWS Grand Junction, CO
- Area
- Counties, with a storm outline in the text
County Routt County, CO
The radar
The Cheyenne radar (KCYS), 172 km from the middle of the area, began a volume at 23:52 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
Grand Junction, CO (KGJT), launched 12:00Z, 11.8 hours before the alert went out and 241 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
- 218 J/kg
- Mixed-layer CIN
- -197 J/kg
- Mixed-layer LCL
- 1722 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS55 KGJT 052351
SVRGJT
COC107-060015-
/O.NEW.KGJT.SV.W.0021.070905T2350Z-070906T0015Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
550 PM MDT WED SEP 5 2007
THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHEASTERN ROUTT COUNTY IN NORTHWEST COLORADO...
* UNTIL 615 PM MDT
* AT 545 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 20
MILES WEST OF MT ZIRKEL...OR ABOUT 33 MILES NORTHEAST OF CRAIG...
AND MOVING EAST AT 35 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
HAHNS PEAK BY 555 PM MDT...
6 MILES NORTHWEST OF MT ZIRKEL BY 615 PM MDT...
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT
WEDNESDAY EVENING FOR NORTHWESTERN COLORADO AND NORTHEASTERN UTAH.
LAT...LON 4095 10685 4091 10680 4088 10673 4088 10667
4086 10664 4081 10664 4070 10707 4087 10716
4097 10685
TIME...MOT...LOC 2350Z 248DEG 33KT 4082 10700
$$
PF1 follow-up statement
000
WWUS55 KGJT 060015
SVSGJT
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
613 PM MDT WED SEP 5 2007
COC107-060023-
/O.EXP.KGJT.SV.W.0021.000000T0000Z-070906T0015Z/
ROUTT CO-
613 PM MDT WED SEP 5 2007
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ROUTT COUNTY
EXPIRES AT 615 PM MDT...
A STRONG THUNDERSTORM WENT THROUGH HAHNS PEAK WITH SMALL HAIL AND
PEA SIZED HAIL.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT
WEDNESDAY EVENING FOR NORTHWESTERN COLORADO AND NORTHEASTERN UTAH.
LAT...LON 4095 10685 4091 10680 4088 10673 4088 10667
4086 10664 4081 10664 4070 10707 4087 10716
4097 10685
TIME...MOT...LOC 0013Z 248DEG 33KT 4090 10674
$$
PFThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 2:19 PM MDT | Flash Flood Warning | GJT | Mesa | 3 hr |
| Sep 5, 2:26 PM MDT | Severe Thunderstorm Warning | GJT | Moffat, Routt | 49 min |
| Sep 5, 3:12 PM MDT | Severe Thunderstorm Warning | GJT | Moffat, Rio Blanco | 48 min |
| Sep 5, 3:42 PM MDT | Severe Thunderstorm Warning | GJT | Moffat | 48 min |
| Sep 5, 3:58 PM MDT | Severe Thunderstorm Warning | GJT | Moffat | 47 min |
| Sep 5, 4:23 PM MDT | Severe Thunderstorm Warning | GJT | Moffat | 52 min |
| Sep 5, 5:47 PM MDT | Severe Thunderstorm Warning | GJT | Moffat, Rio Blanco | 43 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2007Every severe thunderstorm warning in 2007
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.