Alert archive / Utah / Mesoscale Discussions in 2008
Mesoscale Discussion 2521
The Storm Prediction Center issued this mesoscale discussion at Dec 25, 2008, 8:42 AM PST for 4 counties in Nevada; 7 counties in Utah. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 25, 2008, 8:42 AM PST (16:42 UTC)
- Expired
- Dec 25, 2008, 12:45 PM PST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
Counties Elko County, NV, Eureka County, NV, Lander County, NV, White Pine County, NV, Davis County, UT, Juab County, UT, Morgan County, UT, Salt Lake County, UT, Tooele County, UT, Utah County, UT, Weber County, UT
The radar
The Elko radar (KLRX), 167 km from the middle of the area, began a volume at 16:48 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
Elko, NV (KLKN), launched 12:00Z, 4.7 hours before the alert went out and 96 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 893 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 237 m²/s²
- 0-3 km storm-relative helicity
- 340 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 251642 SWOMCD SPC MCD 251642 UTZ000-NVZ000-252045- MESOSCALE DISCUSSION 2521 NWS STORM PREDICTION CENTER NORMAN OK 1042 AM CST THU DEC 25 2008 AREAS AFFECTED...NRN NV/NRN UT CONCERNING...HEAVY SNOW VALID 251642Z - 252045Z HOURLY SNOWFALL RATES OF 1-3 ARE LIKELY THROUGH THE AFTN ACROSS PORTIONS OF NRN NV/UT. RATES WILL BEGIN TO DECREASE ACROSS NRN NV LATER THIS AFTN. A BROAD WARM CONVEYOR BELT...ENHANCED BY A LEAD SHORTWAVE TROUGH OVER NRN UT/ID...HAS BEEN RESPONSIBLE FOR MODEST SNOWFALL EARLY THIS MORNING OVER NRN UT/NV. PCPN RATES WILL LIKELY INCREASE THROUGH THE AFTN...HOWEVER...AS THE NOSE OF A 70 KT MID-LVL JET /OBSERVED AT KRNO/ SPREADS ACROSS THE REGION. THIS WAS ALREADY LIKELY ENHANCING SNOWFALL ALONG A SEWD MOVING CDFNT OVER NCNTRL NV. THIS HEAVY SNOWBAND WILL GRADUALLY SPREAD SEWD WITH TIME THIS AFTN/EVE. CROSS-SECTIONS DEPICT DECREASING STATIC STABILITY ALOFT THROUGH THE AFTN...PARTICULARLY OVER CNTRL/NRN NV...WHERE CONVECTION WILL FURTHER ENHANCE PCPN RATES. STRONG SLY FLOW AHEAD OF THE FRONT WILL CAUSE A SLIGHT RISE IN SNOW LEVELS TO ALMOST 5000 FEET THIS AFTN ACROSS NERN NV/NRN UT WITH LWR VLYS MIXING/CHANGING TO RAIN. BUT...HEAVIER SNOW RATES WILL LOWER LEVELS SOMEWHAT SO THAT EVEN THE HIGHER VLYS MAY EXPERIENCE PREDOMINATELY WET SNOW. HIGHEST SNOWFALL RATES/TOTALS WILL OCCUR ACROSS THE HIGHER RUBY/SNAKE MOUNTAINS IN NV AND ACROSS THE NRN WASATCH MOUNTAINS IN NRN UT. SNOW WILL BEGIN TO DECREASE WITH FRONTAL PASSAGE ACROSS NRN NV BY EVENING...BUT CONTINUE ACROSS PORTIONS OF THE NRN WASATCH MOUNTAINS...ESPECIALLY AS LAKE EFFECT SNOW BEGINS TO EVOLVE. ..RACY.. 12/25/2008 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ...NOTICE... SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS. ATTN...WFO...SLC...LKN...REV... LAT...LON 39491766 41731623 41501133 38931188 39491766
Nearby
Mesoscale Discussions in Utah, 2008Mesoscale Discussions in Nevada, 2008Every mesoscale discussion in 2008
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.