Aikyam-Lab/Synoptic-Bench huggingface dataset:
1024 AM CST FRI JAN 30 2015 UPPER LEVEL RIDGING OVER NORTHERN MEXICO CONTINUING TO INFLUENCE SOUTHEAST TEXAS WITH FAIR WEATHER. DESPITE THE RIDGING PATTERN. MANY AREAS WILL BE MOSTLY CLOUDY TODAY AS MID AND HIGH LEVEL CLOUDS MOVE UP AND OVER THE RIDGE INTO THE AREA FROM AN UPPER LEVEL TROUGH CURRENTLY OVER SOUTHERN CALIFORNIA/BAJA CALIFORNIA. LATEST SURFACE ANALYSIS SHOWS THE COLD FRONT HAS CLEARED THE COAST. SOUTHEAST TEXAS IS ON THE EDGE OF A 1036 MB HIGH PRESSURE MOVING IN BEHIND THE FRONT THAT WILL MOVE OFF TO THE EAST AS THE UPPER TROUGH CONTINUES MOVING EASTWARD. RAIN CHANCES WILL RESUME SATURDAY WITH GRADUALLY INCREASING MOISTURE LEVELS AND A MESSY SW FLOW ALOFT (IN ASSOCIATION W/ WESTERN TROF).
ANOTHER FAST MOVING SHRTWV AND ASSOCIATED COLD FRONT WILL MOVE ACROSS MN TONIGHT.
AN UPPER RIDGE WILL PROVIDE DRY AND MILD WEATHER THROUGH SATURDAY.
THE LATEST WATER VAPOR SATELLITE LOOP SHOWS A FAIRLY DEEP UPPER TROUGH JUST WEST OF THE BAJA PENINSULA. THIS TROUGH IS FORECAST TO DEEPEN THROUGH SATURDAY. AS THE TROUGH APPROACHES. THE MOISTURE AND LARGE SCALE LIFT ASSOCIATED WITH THIS TROUGH WILL RESULT IN INCREASING RAIN CHANCES TONIGHT BEGINNING OUT WEST ALONG THE RIO GRANDE.
1040 AM CST FRI JAN 30 2015 HIGH PRESSURE PREVAILS AT THE SURFACE. THE RAIN WILL HAVE A TOUGH TIME PUSHING EAST DURING THE DAY SATURDAY SO THE HIGHEST POPS WILL REMAIN ACROSS THE NORTHWEST PART OF THE FORECAST AREA. RAIN WILL BECOME WIDESPREAD AREA WIDE AS THE UPPER LOW TO OUR WEST OPENS UP AND MOVES EAST TOWARDS THE AREA. TEMPERATURES THROUGHOUT THIS TIME PERIOD WILL REMAIN WELL ABOVE FREEZING.
GUIDANCE HIGH TEMPS LOOKED A LITTLE TOO WARM IN SOME LOCATIONS SO WENT A LITTLE COOLER.
801 AM PST FRI JAN 30 2015 Areas of low clouds and fog will persist across portions of Inland Northwest as high pressure remains in place.
FORECASTS FOR PRECIPITATION TYPE DURING THIS EVENT ARE COMPLEX GIVEN PROJECTED THERMAL PROFILES VERY NEAR FREEZING OVER MUCH OF THE AREA.
ORIGINATING FROM THE RICH PACIFIC ELEVATED MOISTURE FEED AHEAD OF THE DEVELOPED SRN CA/NRN BAJA CLOSED LOW.
246 PM EST FRI JAN 30 2015 CURRENTLY - A ~1035 MB HIGH PRESSURE CELL IS BUILDING EASTWARD INTO THE EASTERN UNITED STATES. WHILE THE LAST REMNANTS OF A LOW TROUGH DISSIPATES ACROSS SOUTH FLORIDA. FORECAST - THE HIGH WILL BE CENTERED OVER THE CAROLINAS SATURDAY MORNING. ANOTHER SUBTLE SHOT OF COOLER AIR SHOULD KEEP TEMPERATURES A TOUCH BELOW NORMAL ON SATURDAY WITH DEW POINT TEMPERATURES HOLDING IN THE UPPER 60S. AS THE HIGH SHIFTS MORE EAST OF OUR AREA.
UPPER LEVEL FLOW OUT OF A BAJA TROF WILL CONTINUE TO STREAM OVER A DIRTY RIDGE OVER TEXAS RESULTING IN A CIRRUS CANOPY OVER A DRY LAYER. SATURDAY THE UPPER RIDGE WILL BE MOVING OVERHEAD WITH PRECIP INTO CEN TEX. COLD FRONT IS MOVING THROUGH THE GULF WATERS THIS MORNING. A MUCH COOLER DAY IS EXPECTED WITH TEMPERATURES 10 TO 15 DEGREES LOWER. UPPER LOW WILL DIG OVER BAJA AND HELP TO SPREAD CONSIDERABLE HIGH CLOUDINESS OVER THE AREA.
1130 AM EST FRI JAN 30 2015 AVIATION A COLD FRONT MOVED THROUGH LAST NIGHT BRINGING WITH IT GUSTY WINDS AND SOME LIGHT SNOW.
AS THESE PRECIPITATION PROCESSES ALOFT MOISTEN THE VERY DRY AIR IN THE LOWEST 2 MILES OF THE ATMOSPHERE.
307 PM CST FRI JAN 30 2015 COLD FRONT HAS PUSHED INTO THE SOUTHERN GULF OF MEXICO. NEXT UPPER LOW IS STILL WELL TO THE WEST OVER ARIZONA. UPPER LOW MOVES INTO NORTHERN MEXICO BY SATURDAY NIGHT.
HIGHS WILL RANGE FROM THE MID 30S IN OUR FAR EASTERN COUNTIES TO LOWER 50S IN THE LOWER BRULE AREA.
AN U/L DISTURBANCE WILL MOVE OFF THE MID ATLANTIC COAST TONIGHT WITH A DEEPENING AREA OF LOW PRESSURE OFF THE NEW ENGLAND COAST. COLD FRONT ASSOCIATED WITH THE LOW PRESSURE SYSTEM WELL TO THE NORTH IS MOVING ACROSS THE FLORIDA PENINSULA ATTM. AND FLORIDA TONIGHT AND SATURDAY WITH CLEARING SKIES AND DRIER COOLER AIR ADVECTING ACROSS THE REGION. HIGHS ON SATURDAY WILL RANGE FROM THE MID 60S NORTH TO THE LOWER 70S SOUTH.
1116 AM CST Fri Jan 30 2015 The 12Z models have come in even warmer for this weekend, significant accumulations now look to be well north of our region. This would put most of our forecast area in a warmer low lvl southeasterly flow regime, which does not bode well for significant winter weather in this region.
Breezy northerly winds will diminish this evening as high pressure builds in across the Southern Appalachians. Light winds and clear skies will allow temps to drop at or just below the freezing mark over our northernmost zones and the normally colder locations. Otherwise, mins will be in the lower to mid 30s except near 40 along the coast.
AT THIS POINT IT LOOKS LIKE IT SHOULD TRACK NORTH OF US CLOSER TO THE KENTUCKY ILLINOIS BORDER LEAVING US TO BE A SLIGHT BIT WARMER THAN PREVIOUSLY FORECASTED. MODEL GUIDANCE ARE FORECASTING OVERNIGHT LOWS TO STRUGGLE TO GET DOWN TO FREEZING ESPECIALLY IN THE SOUTHERN HALF OF THE TENNESSEE VALLEY.
HIGH PRESSURE MOVING INTO THE FORECAST AREA FROM THE WEST TONIGHT WILL BE OVER THE AREA SATURDAY AND SATURDAY NIGHT.
1133 AM EST FRI JAN 30 2015 A NEW ARCTIC AIRMASS WILL CONTINUE TO POUR INTO THE REGION IN THE WAKE OF OUR DEPARTING COLD FRONT.
TODAY THROUGH SATURDAY NIGHT WATER VAPOR SHOWS SHORT WAVE CROSSING THE NRN ROCKIES AND FLATTENING THE UPPER RIDGE IN PLACE. ASSOCIATED TROF IS ADVANCING INTO ERN MT/ERN WY. THIS WILL ALLOW THERMAL RIDGE TO NOSE INTO THE CWFA AND HELP PUSH TEMPS INTO THE 50S ON THE SD PLAINS. A LITTLE COOLER FURTHER WEST. TEMP FCST WILL BE TRICKY AS ARCTIC AIR ATTEMPTS TO BACK INTO THE SD PLAINS WHILE INVERTED SFC TROF OVER NERN WY KEEPS TEMPS WARMER IN THE WEST. AS 140KT JET STREAK ON BACK SIDE OF TROF ENTERS THE WRN ZONES LATE ON SATURDAY/SATURDAY NIGHT. TEMPS SATURDAY NIGHT SHOULD SETTLE IN THE SINGLE DIGITS ON THE SD PLAINS AND SLIGHTLY WARMER IN THE WRN ZONES.
HAVE UPDATED THE SUITE OF FORECAST PRODUCTS TO RAISE HIGH TEMPS FOR THIS AFTERNOON MAINLY INTO THE LOWER TO MID 40S FOR MOST OF MID STATE. BUT WITH TEMPERATURES AOB FREEZING AT KCSV. NO FREEZING SHOULD TAKE PLACE. A MUCH COLDER AIR MASS IS IN PLACE THAN 24 HRS AGO, WITH STRONG HIGH PRESSURE OVER THE UPPER MIDWEST BUILDING INTO MIDDLE TENNESSEE.
AND SHOULD CONTINUE TO DO SO TONIGHT AS A SLUG OF ELEVATED PACIFIC MOISTURE SPILLS E INTO THE REGION AHEAD OF THE SRN CA/NRN BAJA CLOSED LOW. SFC RIDGING OVER THE MID MS VALLEY SW INTO N TX THIS AFTERNOON REMAINS PROGGED TO GRADUALLY SHIFT E OVERNIGHT AS WELL. SHOULD START TO SEE THE LOW LEVEL MOISTURE TO RETURN TO E TX/WCNTRL LA SATURDAY AFTERNOON.
150 PM PST FRI JAN 30 2015 UPPER LEVEL LOW WILL SLOWLY MOVE EAST OVER THE NEXT 24 HOURS.
HIGH PRESSURE WAS KEEPING THE LOW CLOUDS AND FOG OVER THE LOWER ELEVATIONS OF THE AREA. ELSEWHERE AND ACROSS THE HIGHER ELEVATIONS MOSTLY SUNNY SKIES WILL PERSIST TODAY AS AFTN TEMPS CLIMB TO ABOVE NORMAL.
A DEVELOPING UPPER LOW OVER THE SOUTHERN GREAT BASIN WILL SPREAD MOISTURE INTO UTAH THROUGH SATURDAY. CURRENTLY THERE IS AN EXTENSIVE CLOUD SHIELD ACROSS THE ENTIRE CWA WITH THE LOWEST CEILINGS AND LIGHT PRECIPITATION FROM ABOUT NEPHI TO PRICE SOUTHWARD. THE MAIN CIRCULATION IS LOCATED OVER SOUTHERN CALIFORNIA WITH AN INVERTED TROUGH ANGLED NORTHEASTWARD UP THROUGH CENTRAL UTAH. TO THE EAST OF THIS TROUGH AXIS THERE IS DEEP MOISTURE WITH A SOUTHEAST TO EAST FLOW FAVORING THE UPSLOPE SIDE OF THE HIGHER TERRAIN FROM SALT LAKE CITY SOUTHWARD TO SAINT GEORGE.
354 PM EST FRI JAN 30 2015 LOW PRESSURE WILL INTENSIFY IN THE GULF OF MAINE TONIGHT. THE LOW WILL MOVE TO NEAR THE SOUTHERN TIP OF NOVA SCOTIA EARLY SATURDAY MORNING AND SLOWLY MOVE ACROSS THE MARITIMES THIS WEEKEND.
12Z AND FORECAST SOUNDINGS FROM THE AREA INDICATED THAT DRIER AIR IN THE LOW-MID LEVELS WILL CONTINUE TO FILTER SOUTHWARD INTO THE REGION. THIS WILL RESULT IN CONTINUED DISSIPATION OF THE LOW CLOUDS ACROSS THE FORECAST AREA.
THOUGH HIGH CLOUDS SPILLING OVER AN UPPER RIDGE WILL PASS OVERHEAD AT TIMES THROUGHOUT THE DAY. WEAK MID/UPPER RIDGING WILL BUILD ACROSS THE REGION SATURDAY AND SATURDAY NIGHT. CLOUDS WILL ALSO INCREASE DURING THE PERIOD WITH SLIGHTLY WARMER CONDITIONS EXPECTED.
EXPECT CEILING EROSION BY AROUND 30/22Z AS SFC/UPPER LEVEL RIDGING INFLUENCES BECOME MORE ESTABLISHED. HAVE UPDATED THE SUITE OF FORECAST PRODUCTS TO RAISE HIGH TEMPS FOR THIS AFTERNOON MAINLY INTO THE LOWER TO MID 40S FOR MOST OF MID STATE. BUT WITH TEMPERATURES AOB FREEZING AT KCSV. NO FREEZING SHOULD TAKE PLACE. A MUCH COLDER AIR MASS IS IN PLACE THAN 24 HRS AGO, WITH STRONG HIGH PRESSURE OVER THE UPPER MIDWEST BUILDING INTO MIDDLE TENNESSEE.
1123 AM EST FRI JAN 30 2015 INITIALLY WEAK LOW PRESSURE WILL TRACK EASTWARD FROM THE GREAT LAKES AND REACH THE NEW ENGLAND COAST TODAY. THIS LOW WILL THEN INTENSIFY RAPIDLY AS IT MOVES NORTHEAST TO THE CANADIAN MARITIMES. HIGH PRESSURE FOLLOWS OVER THE WEEKEND.
LOW CLOUDS WILL HOLD OFF UNTIL LATER IN THE DAY ON SATURDAY AS THE UPPER TROF NOW OVER SRN CA AND THE BAJA PENINSULA TRANSITIONS EAST WITH PACIFIC MOISTURE STREAMING ACROSS THE REGION. WITH WINDS JUST ABOVE THE SFC AND HIGHER ALOFT BECOMING MORE S/SW ON SATURDAY WITH THE APPROACHING UPPER TROF. ORIGINATING FROM THE RICH PACIFIC ELEVATED MOISTURE FEED AHEAD OF THE DEVELOPED SRN CA/NRN BAJA CLOSED LOW.
206 PM EST FRI JAN 30 2015 ARCTIC AIR WILL CONTINUE TO POUR INTO THE REGION IN THE WAKE OF OUR DEPARTING COLD FRONT.
MID AND HIGH LEVEL CLOUDS CONTINUE TO MOVE UP AND OVER THE UPPER LEVEL RIDGE CENTERED OVER NORTHERN MEXICO INTO THE AREA FROM AN UPPER LEVEL TROUGH OVER BAJA CALIFORNIA.
PATTERN SYNOPSIS/FORECAST: LONG WAVE TROUGH AXIS ACROSS THE LOWER GREAT LAKES THIS AFTERNOON. WITH WATER VAPOR IMAGERY SHOWING SOME HIGH LATITUDE SHORT WAVE ENERGY DROPPING INTO THE BACKSIDE OF THIS TROUGH. WITH A TROUGH IN THE SOUTHERN BRANCH FLOW NEAR BAJA MEXICO. AS THE NEXT SHOT OF ARCTIC AIR PUSHES INTO THE NORTHERN PLAINS/UPPER MIDWEST (COLD FRONT EXPECTED TO REACH WESTERN UPPER/NORTHWEST WISCONSIN BY DAYBREAK SATURDAY). PRIMARY FORECAST CONCERNS: SNOW CHANCES AS WARMER AIR RETURNS TO NORTHERN MICHIGAN. UNDER AN INCH IN ANY LOCATION EXPECTED WITH THE HIGHEST POPS OVERNIGHT THE FARTHER NORTH ONE GOES. THE ALBERTA CLIPPER MOVES BY TO OUR NORTH AND DRAGS AN ARCTIC COLD FRONT ACROSS THE REGION DURING THE DAY.
244 PM CST FRI JAN 30 2015 PRECIPITATION CHANCES WILL RAMP UP THIS EVENING AS EXPECTED WITH THE UPPER LOW TO THE WEST PUMPING UP THE MOISTURE INTO WEST TEXAS. CURRENT SHORT WAVE RIDGING HAS MADE IT DIFFICULT FOR THE COLUMN TO COMPLETELY SATURATE ESPECIALLY FOR AREAS OFF THE CAPROCK. IT IS DIFFICULT TO SEE SIGNIFICANT SNOWFALL OR FREEZING PRECIPITATION.
150 PM CST Fri Jan 30 2015 An upper low is located INVOF srn Calif with a rich mid/upper level tap of Pacific moisture streaming nwd across the swrn CONUS. The precip shield this morning was mainly out in the wrn CWFA closer to the track of shrtwv trofs. Overnight we expect that the precip shield will expand as said shrtwv trof progresses ewd and as broad area of lift resides over much of the region.
An associated surface cold front will push south out of Canada with light snow expected to develop along the Hi-Line after 09Z.
338 PM CST FRI JAN 30 2015 LARGE PORTION OF SOUTHWEST UPPER LOW ENERGY AND MOISTURE PICKED UP BY WAVE MOVING SOUTHEAST FROM BRITISH COLUMBIA NEXT COUPLE OF DAYS.
PRECIP SHOULD START OUT AS ALL RAIN AT THE KAMA TERMINAL WITH TEMPERATURES ABOVE THE FREEZING MARK. AT KDHT/KGUY ONSET OF PRECIP WILL BE A RAIN/SNOW MIX BUT SHOULD TRANSITION TO ALL SNOW LATER AS LIFT INCREASES IN THE DENDRETIC GROWTH ZONE IN THIS AREA WHILE MODEL SOUNDINGS INDICATE THE COLUMN COOLING BELOW FREEZING. IT LOOKS LIKE THERE WILL BE ENOUGH MOISTURE AND LIFT IN THE DENDRITIC GROWTH ZONE TO KEEP THE PRECIP SNOW OR SLEET AND NOT FREEZING RAIN. RAIN AND SNOW MAY MAKE A RETURN TO MUCH OF THE PANHANDLES AS ANOTHER COLD FRONT MOVES THROUGH THE REGION.
COLD FRONT IS MOVING THROUGH THE GULF WATERS THIS MORNING. A MUCH COOLER DAY IS EXPECTED WITH TEMPERATURES 10 TO 15 DEGREES LOWER. UPPER LOW WILL DIG OVER BAJA AND HELP TO SPREAD CONSIDERABLE HIGH CLOUDINESS OVER THE AREA.
HIGH CLOUDS FROM THIS WILL BE CARRIED EASTWARD AND RIDE OVER AN UPPER LEVEL RIDGE TO BRING US INCREASING CLOUDS IN THE AFTERNOON.
With temperatures expected to remain above freezing, frozen precipitation is not currently expected.
A LOW PRESSURE SYSTEM OFF THE COAST OF SOUTHERN CA/BAJA HAS BEEN RESPONSIBLE FOR PUMPING THIS MOISTURE INTO THE REGION. AND AS THE LOW SHIFTS INTO SOUTHERN CALIFORNIA TODAY. SNOW LEVELS WILL STAY ON THE HIGH SIDE.
1033 AM CST FRI JAN 30 2015 HIGH PRESSURE WILL CONTINUE TO BUILD INTO THE AREA TODAY. HIGH PRESSURE WILL MOVE FROM THE UPPER MIDWEST TO THE OHIO RIVER VALLEY AND EXTEND INTO THE MIDSOUTH. DRY WEATHER WILL PERSIST INTO THE DAY SATURDAY WITH COOL HIGH PRESSURE CONTINUING TO DOMINATE OUR WEATHER. TEMPERATURES WILL BE A LITTLE WARMER IN THE AFTERNOON AS WINDS TURN TO THE SOUTHEAST. A CHANGE IN THE WEATHER WILL OCCUR SATURDAY NIGHT AS A WARM FRONT APPROACHES FROM THE SOUTHWEST AND A NORTHERN STREAM UPPER LEVEL SHORT WAVE APPROACHES FROM THE NORTHWEST.
355 PM CST FRI Jan 30 2015 (Tonight and Saturday) An upper trough over Baja California was bringing lift and scattered showers to Arizona, New Mexico and the Texas Panhandle this afternoon.
247 PM EST FRI JAN 30 2015 HIGH PRESSURE WILL BUILD IN THROUGH SATURDAY.
THE LATEST VISIBLE SATELLITE IMAGERY SHOWS EROSION OF THE LOW CLOUDS AND FOG BUT THE ENTIRE LENGTH OF THE SANTA CLARA VALLEY. TONIGHT WHEN AN UPPER LOW NOW OVER SOCAL MOVES TO THE EAST. NORTHERN CALIFORNIA REMAINS UNDER A STAGNANT WEATHER PATTERN WITH AN UPPER RIDGE NOSING INTO THE PACIFIC NORTHWEST AND OVER NORTHERN CALIFORNIA. THE HIGH PRESSURE RIDGE WILL CONTINUE TO SHUNT ALL RAIN CHANCES WELL NORTH OF OUR DISTRICT THROUGH THE FORECAST PERIOD. KEEPS THE RIDGE INTACT FOR CONTINUED DRY CONDITIONS FOR NORTHERN CALIFORNIA. VISBILITIES HAVE IMPROVED BUT THE LOW CLOUDS ARE EXPECTED TO LINGER A LITTLE LATER INTO THE MORNING. KSFO BRIDGE APPROACH. SF BAY NORTH OF THE BAY BRIDGE UNTIL NOON.
942 AM PST FRI JAN 30 2015 Areas of low clouds and fog will persist across portions of Inland Northwest as high pressure remains in place.
PLENTY OF CLOUDS WERE FOUND TO BE UNDERCUTTING THE HIGH IN WARM AIR ADVECTION AHEAD OF A CLIPPER LIKE SYSTEM THAT IS PROGGED TO AFFECT THE AREA TODAY AND TONIGHT. HIGH PRESSURE DROPS OVER THE REST OF THE AREA.
328 PM CST Fri Jan 30 2015 Little happening in the short term, as axis of high pressure extends northeast-southwest across the forecast area this afternoon. As with previous systems that have moved across the area the past couple of months, our CWA will be right in the middle of where two mid level troughs will be phasing together. On the surface, the low pressure area is still developing in the southwestern US and will not move out into the southern plains until Saturday evening. However, a cold front will be dropping down into Illinois at the same time, and how far this gets into central Illinois will determine where the cutoff of the warm air and cold air is, which will also determine where the heavy snowfall will occur.
THE MODELS ARE SPLIT ON THE PTYPE RAIN VS SNOW AS TEMPERATURES ALOFT ARE QUITE MARGINAL FOR SNOW GROWTH WITH H700MB TEMPERATURES IN THE LOW SINGLE DIGITS AND H800MB TEMPERATURES NEAR 0C. MID AND UPPER LEVEL SUB TROPICAL MOISTURE WILL BE IN PLACE AS IT STREAMS NORTHWARD AHEAD OF A DEEP UPPER LEVEL TROUGH ACROSS THE WESTERN AND SOUTHWEST PORTIONS OF THE UNITED STATES.
156 PM CST Fri Jan 30 2015 An upper level low is currently located across southern California as an upper level trough is starting to push into the Pacific Northwest. An upper level ridge is located across the plains ahead of these features. Tonight the trough will dive out of the northwest towards the region as the upper level low tracks to the southeast and will they will phase together over the region. As this occurs the ridge will push east and flatten tonight into Saturday. As the upper level low tracks east and the trough south, rain will start to spread towards the area.
/ISSUED 300 AM CST FRI JAN 30 2015/ (Today and Tonight) An upper trough will dominate the western CONUS today with a closed upper low over southern California. A southwest flow aloft on the eastern periphery of the western trough will pump substantial Pacific moisture over the Desert Southwest today including extreme West Texas. As the upper trough continues to trek eastward through tonight, concomitant with periodic disturbances embedded in the southwest flow aloft, chances of rain will be on the increase and should envelop the entire forecast area by late this evening and through the overnight hours. Highs today under cloudy skies will be in the upper 40s to the lower 50s.
THEN ANOTHER CHANCE FOR LIGHT SNOW AHEAD OF A COLD FRONT SAT IN THE SOUTH. IT SHOULD BE DRY AS THE COLD FRONT BEGINS TO MOVE FROM NORTH TO SOUTH.
COLD FRONT PASSED OVERNIGHT. COLD FRONT HAS BEEN MOVING THROUGH THE REGION EARLY THIS MORNING. AND COOLER TEMPERATURES ACROSS THE REGION. IT WILL FEEL FAIRLY COOLER TODAY COMPARED TO THE PAST FEW DAYS.
AN UPPER LOW LOCATED OVER SOUTHERN CA WAS DRAWING ABUNDANT MOISTURE UP ACROSS AZ AND NM. MODELS INDICATE THAT THE UPPER LOW OVER SOUTHERN CA THIS MORNING WILL MOVE VERY LITTLE OVER THE NEXT 24 HRS. THE AREA THAT WILL MOST LIKELY SEE THE HIGHEST AMOUNTS FOR NEW SNOWFALL WILL BE THE SW MTS. SFC COLD FRONT IS FORECAST TO DROP SOUTH OF THE PALMER DVD VERY EARLY SAT MORN.
WITH THE WARMER START SATURDAY MORNING. TEMPERATURES WILL HAVE A CHANCE TO REBOUND WELL INTO THE 20S BEFORE THE COLD FRONT SAGS SOUTHWARD AGAIN LATER IN THE DAY.
A STRONG RIDGE OF HIGH PRES ALOFT OVER THE ROCKIES AND CENTRAL U. LOW LEVEL WINDS MAINLY NLY TONIGHT AND BECOMING LIGHT WILL ENABLE LOWS TO DROP OFF TO THE LOWER AND MID 30S. A FEW LOCATIONS MAY DIP TO FREEZING FOR A SHORT DURATION. TEMPS WILL A BIT COOLER WITH LOWER THICKNESS VALUES AND ONSHORE FLOW AROUND 10 TO OCNL 15 MPH.
A TROUGH ON THE NORTH LOW MOVING THROUGH THE SOUTHWEST MAY BRING ENOUGH MOISTURE FOR ISOLATED SHOWERS NEAR THE NV-TWIN FALLS COUNTY LINE AS IT SHIFTS EAST TODAY. BEHIND THAT LOW HIGH PRESSURE AT THE SURFACE AND ALOFT WILL STRENGTHEN THE INVERSION ACROSS SE OREGON AND SW IDAHO SATURDAY.
356 PM CST FRI JAN 30 2015 A SHORT WAVE TROUGH WILL BRING WIDESPREAD RAIN ACROSS THE SOUTHERN PLAINS LATE TONIGHT AND THROUGH SATURDAY INTO SATURDAY NIGHT. THE HIGHEST RAINFALL AMOUNTS ARE MOST LIKELY ACROSS SOUTHWEST OKLAHOMA AND WESTERN NORTH TEXAS.
309 PM CST FRI JAN 30 2015 HIGH PRESSURE WILL REMAIN OVER THE MIDSOUTH TONIGHT. THE HIGH WILL SHIFT EAST ALLOWING WINDS TO TURN AROUND TO THE SOUTH. THIS WILL ALLOW HIGHS TO GET INTO THE LOWER TO MID 50S IN MUCH OF THE AREA EVEN WITH AN EXPECTED INCREASE IN CLOUD COVER AHEAD OF THE NEXT SYSTEM.
1208 PM CST Fri Jan 30 2015 Updated for the expiration of the High Wind Warning for Guadalupe Pass. With temperatures expected to remain above freezing, frozen precipitation is not currently expected.
/ISSUED 1040 AM CST FRI JAN 30 2015/ HIGH PRESSURE PREVAILS AT THE SURFACE. THE RAIN WILL HAVE A TOUGH TIME PUSHING EAST DURING THE DAY SATURDAY SO THE HIGHEST POPS WILL REMAIN ACROSS THE NORTHWEST PART OF THE FORECAST AREA. RAIN WILL BECOME WIDESPREAD AREA WIDE AS THE UPPER LOW TO OUR WEST OPENS UP AND MOVES EAST TOWARDS THE AREA. TEMPERATURES THROUGHOUT THIS TIME PERIOD WILL REMAIN WELL ABOVE FREEZING.
THE LATEST VISIBLE SATELLITE IMAGERY SHOWS EROSION OF THE LOW CLOUDS AND FOG BUT THE ENTIRE LENGTH OF THE SANTA CLARA VALLEY. TONIGHT WHEN AN UPPER LOW NOW OVER SOCAL MOVES TO THE EAST. NORTHERN CALIFORNIA REMAINS UNDER A STAGNANT WEATHER PATTERN WITH AN UPPER RIDGE NOSING INTO THE PACIFIC NORTHWEST AND OVER NORTHERN CALIFORNIA. THE HIGH PRESSURE RIDGE WILL CONTINUE TO SHUNT ALL RAIN CHANCES WELL NORTH OF OUR DISTRICT THROUGH THE FORECAST PERIOD. KEEPS THE RIDGE INTACT FOR CONTINUED DRY CONDITIONS FOR NORTHERN CALIFORNIA. KSFO BRIDGE APPROACH. SF BAY NORTH OF THE BAY BRIDGE UNTIL NOON.
A surface cold front will also begin pushing south after 06z.
A BUILDING UPPER RIDGE AND OFFSHORE FLOW SHOULD PRODUCE RELATIVELY MILD TEMPERATURES.
1253 PM PST FRI JAN 30 2015 Areas of low clouds and fog will persist across portions of Inland Northwest as high pressure remains in place.
417 PM EST FRI JAN 30 2015 LAKE EFFECT CLOUDS AND FLURRIES WILL CONTINUE TO DIMINISH THIS EVENING AS HIGH PRESSURE BUILDS ACROSS THE REGION.
326 PM CST FRI JAN 30 2015 COOL CONDITIONS HAVE MOVED IN BEHIND A COLD FRONT THAT PASSED THROUGH LAST NIGHT. HIGH PRESSURE IS MOVING INTO THE REGION WITH RADIATIONAL COOLING EXPECTED TO CAUSE TEMPERATURES TO DROP INTO THE MID TO UPPER 20S FOR THE ENTIRE AREA TONIGHT.
WATER VAPOR LOOP INDICATED AN UPPER TROUGH OVER NORTHERN MAN/HUDSON BAY. TROUGH WILL ROTATE ACROSS SOUTHEAST CANADA TONIGHT AND SAT AND SEND COLD AIR ACROSS THE BORDER TONIGHT THROUGH SAT NIGHT.
INITIAL ROUND OF PRECIP IS EXPECTED TO SPREAD INTO SOUTHEAST NEBRASKA LATE TONIGHT WITH GFS FORECAST SOUNDINGS SHOWING MAINLY RAIN OR A MIX OF RAIN/SNOW WITH SURFACE TEMPERATURES IN THE LOWER TO MID 30S. LITTLE SNOW ACCUMULATION EXPECTED DURING THIS TIME DUE TO ABOVE FREEZING SURFACE TEMPERATURES SOUTH AND LIMITED MOISTURE IN THE NORTH.
/ISSUED 1033 AM CST FRI JAN 30 2015/ HIGH PRESSURE WILL CONTINUE TO BUILD INTO THE AREA TODAY. HIGH PRESSURE WILL MOVE FROM THE UPPER MIDWEST TO THE OHIO RIVER VALLEY AND EXTEND INTO THE MIDSOUTH. DRY WEATHER WILL PERSIST INTO THE DAY SATURDAY WITH COOL HIGH PRESSURE CONTINUING TO DOMINATE OUR WEATHER. TEMPERATURES WILL BE A LITTLE WARMER IN THE AFTERNOON AS WINDS TURN TO THE SOUTHEAST. A CHANGE IN THE WEATHER WILL OCCUR SATURDAY NIGHT AS A WARM FRONT APPROACHES FROM THE SOUTHWEST AND A NORTHERN STREAM UPPER LEVEL SHORT WAVE APPROACHES FROM THE NORTHWEST.
408 PM EST FRI JAN 30 2015 LAKE EFFECT CLOUDS AND FLURRIES WILL CONTINUE TO DIMINISH THIS EVENING AS HIGH PRESSURE BUILDS ACROSS THE REGION.
SURFACE MIXING RATIOS INCREASING WITH THE SOUTH WINDS AND GOOD PRESSURE FALLS EAST OF THE TROUGH. THEN ANOTHER CHANCE FOR LIGHT SNOW AHEAD OF A COLD FRONT SAT IN THE SOUTH. IT SHOULD BE DRY AS THE COLD FRONT BEGINS TO MOVE FROM NORTH TO SOUTH.
AND STAYED ON THE LOW SIDE OF GUIDANCE WITH RESPECT TO TEMPERATURES OVERNIGHT. DROPPING TO AROUND 5 BELOW ZERO THROUGH THE HIGHWAY 14 CORRIDOR TO NEAR ZERO THROUGH THE MO RIVER VALLEY. WITH A SOUTHERLY FLOW RETURNING ON THE BACKSIDE OF THE HIGH. WITH SPORADIC LIGHT SNOW CHANCES AS VARIOUS WARM/COLD FRONTS MOVE ACROSS THE REGION WITH QUICK MID-UPPER LEVEL WAVES IN NORTHWEST FLOW. FIRST WARM FRONT WILL CONTINUE MOVING EAST THURSDAY EVENING.
A mid-level trough was situated over the Great Lakes region with a mid-level ridge strengthening along the Pacific coastline. This cloud cover combined with cold air advection from breezy northerly winds kept conditions cooler with highs in the 30s. Low/mid cloud cover will increase from west to east on Thursday as an area of low pressure over the Rockies shifts further eastward into Kansas.
Steady to even slightly rising temperatures are expected tonight as southerly flow returns, cloud cover increases, and warmer temperatures build in aloft, resulting in lows in the teens to lower 20s early in the night.
1031 PM MST WED FEB 11 2015 LATEST WATER VAPOR LOOP WAS SHOWING THE UPPER LEVEL RIDGE CONTINUING TO DOMINATE THE REGION. THERE IS SOME CIRRUS BEGINNING TO SPILL OVER THE RIDGE WHICH IS EXPECTED TO MOVE OVER THE AREA BEGINNING TONIGHT AND CONTINUING THROUGH TOMORROW.
ASSOCIATED ARCTIC COLD FRONT TO PUSH THROUGH THIS EVENING INTO THE OVERNIGHT WITH A REINFORCING SHOT OF COLD AIR. AS HIGH PRESSURE BUILDS INTO THE STATE LATE TONIGHT. WILL AGAIN REFRAIN FROM ANY HEADLINE ISSUANCE WITH SOME QUESTION AS TO HOW FAST THE WINDS WILL DIMINISH AS THE HIGH MOVES IN AND THE SFC PRES GRADIENT RELAXES. STEEPENED LAPSE RATES EXPECTED THROUGHOUT THE LOWER LEVELS OF THE ATMOSPHERE ALONG WITH SOME WEAK INSTABILITY. THERE WILL BE MINOR FLUCTUATIONS THROUGH THE PERIOD BUT THE OVERALL PATTERN WILL CHANGE LITTLE WITH MEAN TROUGH AXIS ONLY SHIFTING FROM ERN TO CENTRAL CONUS WITH TIME. CURRENT DEEP PV TROUGH AND ASSOCIATED RISE/FALL COUPLET ENTERING THE NRN PLAINS/GREAT LAKES WILL BE WELL PAST THE AREA BY THU WITH COLD AIR CONTINUING TO SPILL INTO THE MS VALLEY.