Severe Storm Outlook Narrative (AC)
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
ACUS01 KWNS 020446
SWODY1
SPC AC 020444

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1144 PM CDT FRI AUG 01 2014

VALID 021200Z - 031200Z

...NO SVR TSTM AREAS FORECAST...

...SUMMARY...
A FEW STRONG TO SEVERE STORMS WILL BE POSSIBLE FROM PORTIONS OF
CENTRAL AND NORTHEASTERN OREGON...EASTERN WASHINGTON...NORTHERN
IDAHO INTO WESTERN MONTANA. A FEW OF THESE STORMS MAY BECOME CAPABLE
OF PRODUCING ISOLATED STRONG WIND GUSTS AND HAIL.

...SYNOPSIS...

BLOCKING PATTERN WILL PERSIST SATURDAY WITH UPPER TROUGH IN PLACE
OVER THE EASTERN HALF OF THE U.S. AND AN UPSTREAM RIDGE DOMINATING
MUCH OF THE WEST. WEAK VORTICITY MAXIMA WILL MOVE ALONG THE NWRN
PERIPHERY OF THE UPPER RIDGE INTO THE PACIFIC NW. AN UPPER LOW NOW
OVER BAJA WILL MOVE NWD REACHING SRN CA SATURDAY NIGHT.

...PACIFIC NW THROUGH NRN ROCKIES AREA...

AN AXIS OF MODEST INSTABILITY /400-800 J/KG MLCAPE/ WILL LIKELY
DEVELOP GENERALLY EAST OF THE CASCADES ACROSS ERN OREGON AND WA AS
WELL AS FARTHER EAST ACROSS THE NRN ROCKIES. A BELT OF 25-35 KT
MID-UPPER FLOW WILL SPREAD THROUGH THIS REGION IN ASSOCIATION WITH A
SHORTWAVE TROUGH LIFTING NEWD ALONG NWRN PERIPHERY OF THE UPPER
RIDGE...BUT DEEP SHEAR WILL REMAIN GENERALLY AOB 30 KT.
DESTABILIZATION AND DEEP MIXING OF THE BOUNDARY LAYER ALONG WITH
OROGRAPHIC FORCING WILL RESULT IN THUNDERSTORM INITIATION DURING THE
AFTERNOON. INVERTED-V PROFILES AND STEEP LAPSE RATES WILL PROMOTE A
THREAT FOR MAINLY ISOLATED DOWNBURST WINDS THROUGH EARLY EVENING.

...ELSEWHERE...

SCATTERED STORMS WILL OCCUR FROM THE CNTRL THROUGH SRN ROCKIES INTO
THE INTERMOUNTAIN WEST. OTHER STORMS WILL DEVELOP FROM THE NRN
PLAINS ALONG A SEWD MOVING COLD FRONT AS WELL AS FARTHER EAST OVER
THE OH VALLEY AND MID-ATLANTIC REGION IN ASSOCIATION WITH IMPULSES
MOVING THROUGH THE UPPER LOW. IN ALL OF THESE AREAS THE
SHEAR-INSTABILITY PARAMETER SPACE WILL NOT BE SUFFICIENT FOR AN
ORGANIZED SEVERE THREAT...BUT ISOLATED INSTANCES OF STRONG WIND
GUSTS CANNOT BE RULED OUT.

..DIAL/GRAMS.. 08/02/2014



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.