Alert archive / Utah / Mesoscale Discussions in 2005

Mesoscale Discussion 892

May 16, 200512 counties in Utah

The Storm Prediction Center issued this mesoscale discussion at May 16, 2005, 6:00 PM MDT for 12 counties in Utah. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
May 16, 2005, 6:00 PM MDT (00:00 UTC)
Expired
May 16, 2005, 7:30 PM MDT
In force
90 min
Issued by
the Storm Prediction Center

Counties Beaver County, UT, Cache County, UT, Davis County, UT, Juab County, UT, Millard County, UT, Morgan County, UT, Piute County, UT, Salt Lake County, UT, Sanpete County, UT, Sevier County, UT, Utah County, UT, Weber County, UT

The radar

The Salt Lake City radar (KMTX), 194 km from the middle of the area, began a volume at 00:00 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 00:00Z, 0.0 hours before the alert went out and 153 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 00:00Z on 2005-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 272 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, Salt Lake City I, UT at 00:00Z on 2005-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 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
272 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
2697 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
244 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

000 
ACUS11 KWNS 170001
SWOMCD
SPC MCD 170000 
UTZ000-NVZ000-170130-

MESOSCALE DISCUSSION 0892
NWS STORM PREDICTION CENTER NORMAN OK
0700 PM CDT MON MAY 16 2005

AREAS AFFECTED...CNTRL AND ERN UT

CONCERNING...SEVERE THUNDERSTORM WATCH 281...

VALID 170000Z - 170130Z

THREAT FOR ISOLATED DAMAGING WIND IS EXPECTED TO PERSIST WITH LINE
OF FORCED STORMS THOUGH SWRN...CNTRL AND PARTS OF NRN UT NEXT FEW
HOURS. NRN PART OF THE LINE WILL BEGIN MOVING E OF WW 281 AND INTO
SWRN WY BY 0130Z...BUT A NEW WW EAST OF 281 IS NOT EXPECTED AT THIS
TIME.

A FORCED LINE OF STORMS DEVELOPING ALONG AND JUST E OF A COLD FRONT
EXTENDS FROM THE SALT LAKE CITY AREA SWWD TO W OF MILFORD. THE NRN
PART OF THE LINE HAS A WELL DEVELOPED COLD POOL AND CONTINUES EAST
AT AROUND 35-40 KT WHILE MORE SCATTERED CONVECTION IS DEVELOPING
ALONG THE PORTION OF THE FRONT OVER SWRN UT. STRONG FORCING
ACCOMPANYING THE COLD POOL...COLD FRONT AND SHORTWAVE TROUGH SHOULD
HELP TO MAINTAIN STORMS INTO THE EVENING. INSTABILITY IS MARGINAL
DOWNSTREAM FROM THE LINE WITH MLCAPE GENERALLY AOB 500 J/KG.
HOWEVER...LARGE TEMPERATURE/DEWPOINTS SPREADS FROM 35-40F AND STRONG
GRADIENT FLOW WILL CONTINUE TO SUPPORT THREAT OF DAMAGING WIND NEXT
FEW HOURS.

..DIAL.. 05/17/2005

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

ATTN...WFO...SLC...VEF...

38081408 40201288 41611264 41891137 38751117 38091234

Nearby

Mesoscale Discussions in Utah, 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.