Alert archive / Utah / Mesoscale Discussions in 2007

Mesoscale Discussion 511

April 16, 20078 counties in Utah

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2007, 1:00 PM MDT for 8 counties in Utah. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 16, 2007, 1:00 PM MDT (19:00 UTC)
Expired
Apr 16, 2007, 3:00 PM MDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Emery County, UT, Garfield County, UT, Grand County, UT, Piute County, UT, San Juan County, UT, Sanpete County, UT, Sevier County, UT, Wayne County, UT

The radar

The Grand Junction radar (KGJX), 218 km from the middle of the area, began a volume at 19:02 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, 7.0 hours before the alert went out and 196 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 2007-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 130 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 2007-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 120 square meters per square second.1939587897Sfc1 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
130 J/kg
Mixed-layer CIN
-182 J/kg
Mixed-layer LCL
1235 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
120 m²/s²
0-3 km storm-relative helicity
85 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 161900
SWOMCD
SPC MCD 161900 
COZ000-UTZ000-162100-

MESOSCALE DISCUSSION 0511
NWS STORM PREDICTION CENTER NORMAN OK
0200 PM CDT MON APR 16 2007

AREAS AFFECTED...CNTRL/SRN UT  AND WRN CO

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 

VALID 161900Z - 162100Z

LATEST WATER VAPOR IMAGERY SHOWS THE CENTER OF AN UPR LOW OVER NWRN
AZ WITH SEVERAL SHORTWAVE TROUGHS SPINNING AROUND THE LOW IN THE GRT
BASIN REGION.  ONE SUCH IMPULSE WAS MOVING NWWD VCNTY THE FOUR
CORNERS REGION AND HAS BEEN IMPETUS FOR INCREASING TSTMS OVER THE
HIGHER TERRAIN OF ECNTRL/SERN UT AND WRN CO.  H5 TEMPERATURES AROUND
MINUS 20 DEG C...HEATING AND LARGE SCALE ASCENT WILL CONTINUE TO BE
FAVORABLE FOR TSTMS THROUGH EARLY EVE.  TSTMS WILL MOVE OFF THE
HIGHER TERRAIN TO THE WNW AND GIVEN DEEP...RELATIVELY DRY SUB-CLOUD
LAYER...SVR/DAMAGING WINDS MAY OCCUR ALONG WITH HAIL IN THE STRONGER
STORMS.

..RACY.. 04/16/2007

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

ATTN...WFO...GJT...SLC...

39391207 39640930 38030844 37320960 37491236

Nearby

Mesoscale Discussions in Utah, 2007Every mesoscale discussion 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.