Alert archive / Colorado / Mesoscale Discussions in 2006

Mesoscale Discussion 430

April 5, 200614 counties in Colorado; 5 counties in Utah; 4 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2006, 10:53 AM MDT for 14 counties in Colorado; 5 counties in Utah; 4 counties in Wyoming. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 5, 2006, 10:53 AM MDT (16:53 UTC)
Expired: Apr 5, 2006, 1:00 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 23 counties

Delta County, CO, Dolores County, CO, Garfield County, CO, Gunnison County, CO, Hinsdale County, CO, La Plata County, CO, Mesa County, CO, Moffat County, CO, Montezuma County, CO, Montrose County, CO, Ouray County, CO, Rio Blanco County, CO, San Juan County, CO, San Miguel County, CO, Daggett County, UT, Duchesne County, UT, Grand County, UT, San Juan County, UT, Uintah County, UT, Lincoln County, WY, Sublette County, WY, Sweetwater County, WY, Uinta County, WY

The radar

The Grand Junction radar (KGJX), 75 km from the middle of the area, began a volume at 16:54 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.

Severe Thunderstorm Watch 151Apr 5, 11:30 AM MDT

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 4.9 hours before the alert went out and 56 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2150 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 417 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 051654
SWOMCD
SPC MCD 051653 
WYZ000-COZ000-NMZ000-AZZ000-UTZ000-IDZ000-051900-

MESOSCALE DISCUSSION 0430
NWS STORM PREDICTION CENTER NORMAN OK
1153 AM CDT WED APR 05 2006

AREAS AFFECTED...ERN UT/WRN CO AND SW WY

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 051653Z - 051900Z

THUNDERSTORM DEVELOPMENT WILL CONTINUE THROUGH EARLY AFTERNOON
ACROSS WRN CO...ERN UT AND SWRN WY. THE MORE INTENSE STORMS WILL
HAVE A POTENTIAL FOR HAIL AND ISOLATED WIND DAMAGE. A WW WILL LIKELY
BECOME NECESSARY BY THIS AFTERNOON ACROSS THE REGION.

WATER VAPOR IMAGERY CURRENTLY SHOWS AN IMPRESSIVE WEST COAST
UPPER-LEVEL TROUGH WITH A DRY SLOT AND BAND OF STRONG LARGE-SCALE
ASCENT DRIFTING ENEWD ACROSS THE REGION. A LINE OF STORMS IS ONGOING
ALONG THE LEADING EDGE OF ASCENT AND ADDITIONAL STORMS SHOULD
DEVELOP ACROSS ERN UT OVER THE NEXT HOUR AS SFC TEMPS WARM TO NEAR
70 F AND ASCENT INCREASES IN THE NOSE OF A 100 KT MID-LEVEL JET.
FORECAST SOUNDINGS ACROSS THE REGION THIS AFTERNOON SHOW VERY STEEP
MID-LEVEL LAPSE RATES AND STRONG VERTICAL SHEAR SUGGESTING
SUPERCELLS WITH HAIL POTENTIAL WILL INCREASE. IN ADDITION...SFC
TEMP-DEWPOINT DEPRESSIONS WILL EXCEED 30 DEGREES F ENHANCING THE
WIND DAMAGE POTENTIAL WITH THE STRONGER CELLS.

..BROYLES.. 04/05/2006

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

ATTN...WFO...PUB...CYS...ABQ...RIW...GJT...FGZ...SLC...PIH...

36770798 36740897 37400978 38851007 40951077 41831106
42231108 42741046 42950907 42490809 41200763 40080736
38740711 38670697 37530713 37060743

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 5, 11:28 AM MDT	Severe Thunderstorm Watch	SPC	Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more	6 hr
Apr 5, 4:41 PM MDT	Mesoscale Discussion	SPC	Archuleta, Chaffee, Conejos, Delta, Dolores, Eagle and 21 more	64 min
Apr 5, 3:59 PM MDT	Mesoscale Discussion	SPC	Big Horn, Campbell, Converse, Crook, Fremont, Hot Springs and 6 more	91 min

Nearby

Mesoscale Discussions in Colorado, 2006 Mesoscale Discussions in Utah, 2006 Mesoscale Discussions in Wyoming, 2006 Every mesoscale discussion in 2006

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.