Alert archive / Utah / Mesoscale Discussions in 2005

Mesoscale Discussion 1521

June 28, 2005Moffat County, Colorado; 12 counties in Utah

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2005, 11:48 AM MDT for Moffat County, Colorado; 12 counties in Utah. It was in force for 27 min.

The area

The outline as issued.

The facts

Issued
Jun 28, 2005, 11:48 AM MDT (17:48 UTC)
Expired
Jun 28, 2005, 12:15 PM MDT
In force
27 min
Issued by
the Storm Prediction Center

Counties Moffat County, CO, Carbon County, UT, Daggett County, UT, Duchesne County, UT, Emery County, UT, Garfield County, UT, Grand County, UT, Piute County, UT, San Juan County, UT, Sanpete County, UT, Sevier County, UT, Uintah County, UT, Wayne County, UT

The radar

The Grand Junction radar (KGJX), 191 km from the middle of the area, began a volume at 17:51 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 5.8 hours before the alert went out and 170 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.

Skew-T log-pSkew-T log-p diagram, Grand Junction, CO at 12:00Z on 2005-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Grand Junction, CO at 12:00Z on 2005-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 92 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3652 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
92 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
ACUS11 KWNS 281749
SWOMCD
SPC MCD 281748 
COZ000-WYZ000-AZZ000-UTZ000-281815-

MESOSCALE DISCUSSION 1521
NWS STORM PREDICTION CENTER NORMAN OK
1248 PM CDT TUE JUN 28 2005

AREAS AFFECTED...SRN/ERN UT...WRN CO...NE AZ

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 281748Z - 281815Z

WW LIKELY WILL BE ISSUED WITHIN THE HOUR.

MID-LEVEL CYCLONIC VORTICITY CENTER REMAINS STRONG AS IT LIFTS
NORTHEASTWARD OUT OF THE LOWER COLORADO VALLEY.  OBJECTIVE ANALYSIS
INDICATES 50+ KT MID-LEVEL JET STREAK ON SOUTHEASTERN PERIPHERY OF
THIS FEATURE...WHICH WILL CONTINUE TO NOSE ACROSS THE FOUR CORNERS
REGION THIS AFTERNOON. LARGE-SCALE FORCING IN EXIT REGION OF JET...
AHEAD OF UPPER TROUGH AXIS...HAS SUPPORTED INCREASING THUNDERSTORMS
IN THE LEE OF THE WASATCH PAST FEW HOURS.  THIS ACTIVITY IS
DEVELOPING EASTWARD INTO INCREASINGLY DEEP MIXED BOUNDARY LAYER
ACROSS EASTERN UTAH...WHERE LARGE TEMPERATURE/DEW POINTS SPREADS
WILL SUPPORT POTENTIAL FOR MICROBURSTS.  WITH FURTHER HEATING AND
CONTINUED STRENGTHENING OF MID-LEVEL FLOW ACROSS THE EASTERN GREAT
BASIN...POTENTIAL FOR BROADER SCALE DAMAGING WIND GUSTS APPEARS
LIKELY TO INCREASE AS BROKEN CONVECTIVE BAND APPROACHES THE
UTAH/COLORADO BORDER AREA BY AROUND 21Z.

..KERR.. 06/28/2005

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...RIW...GJT...FGZ...SLC...

37821267 38711258 40661072 40980978 41100888 40530805
39570849 38180868 37150912 36580967 36491054 37131098
37181165

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 27, 6:53 PM MDTMesoscale DiscussionSPCSedgwick2 hr
Jun 28, 3:50 PM MDTMesoscale DiscussionSPCChaffee, Delta, Dolores, Eagle, Garfield, Grand and 16 more85 min
Jun 28, 4:13 PM MDTMesoscale DiscussionSPCKit Carson, Logan, Morgan, Phillips, Sedgwick, Washington and 2 more92 min
Jun 28, 12:45 PM MDTSevere Thunderstorm WatchSPCCarbon, Daggett, Duchesne, Emery, Garfield, Grand and 10 more7 hr

Nearby

Mesoscale Discussions in Utah, 2005Mesoscale Discussions in Colorado, 2005Every mesoscale discussion in 2005

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.