Alert archive / Utah / Mesoscale Discussions in 2003

Mesoscale Discussion 1981

July 25, 200310 counties in Utah

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2003, 2:13 PM MDT for 10 counties in Utah. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 25, 2003, 2:13 PM MDT (20:13 UTC)
Expired
Jul 25, 2003, 4:15 PM MDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Beaver County, UT, Garfield County, UT, Iron County, UT, Juab County, UT, Kane County, UT, Millard County, UT, Piute County, UT, Sanpete County, UT, Sevier County, UT, Washington County, UT

The radar

The Cedar City radar (KICX), 65 km from the middle of the area, began a volume at 20:17 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 8.2 hours before the alert went out and 300 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, Salt Lake City I, UT at 12:00Z on 2003-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 joules per kilogram.LCLLFCEL10008507005003002001001 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, Salt Lake City I, UT at 12:00Z on 2003-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939Sfc1 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
27 J/kg
Mixed-layer CIN
-173 J/kg
Mixed-layer LCL
2358 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
52 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 252014
SWOMCD
SPC MCD 252013 
UTZ000-AZZ000-NVZ000-252215-

MESOSCALE DISCUSSION 1981
NWS STORM PREDICTION CENTER NORMAN OK
0313 PM CDT FRI JUL 25 2003

AREAS AFFECTED...SWRN UT...NWRN AZ...SRN NV

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 252013Z - 252215Z

STRONG/SEVERE THUNDERSTORMS WHICH MOVED THRU LAS AREA ARE
PROPAGATING N WITH NEW CONVECTIVE DEVELOPMENT OCCURRING ON OUTFLOW
BOUNDARIES FROM EARLIER STORMS.  AIR MASS HAS CONTINUED TO
DESTABILIZE INTO SWRN UT AND N OF CURRENT ACTIVITY ACROSS SRN NV
WITH MUCAPES TO 1500-2000 J/KG. IN ADDITION T/TD SPREADS UP TO 40F
INTO SWRN UT HAVE INCREASED POTENTIAL FOR DAMAGING DOWNBURST WINDS
AS STORMS CONTINUE DEVELOPING NWD THRU THIS AREA.  STORMS WILL
LIKELY EFFECT THE ST GEORGE UT AREA BETWEEN 21-22Z.

..HALES.. 07/25/2003

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

ATTN...WFO...FGZ...SLC...VEF...LKN...

36911163 36861400 37281479 38861492 40001414 40121225
39301123 37361098

Nearby

Mesoscale Discussions in Utah, 2003Every mesoscale discussion in 2003

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.