Heavy Snow in NE, Tornadoes in LA
Posted by JAC on 10/22/2009, 8:40 am
 MESOSCALE DISCUSSION 2121 NWS STORM PREDICTION CENTER NORMAN OK 0525 AM CDT THU OCT 22 2009 AREAS AFFECTED...W CNTRL NEB CONCERNING...HEAVY SNOW VALID 221025Z - 221630Z SNOWFALL RATES UP TO 1 IN/HR ARE LIKELY THROUGH THE EARLY MORNING HOURS. LOW LEVEL WARM ADVECTION AND DYNAMIC COOLING ARE CONTRIBUTING TO LIFT AROUND THE NRN EDGE OF AN UPPER LOW THAT WILL CONTINUE TO SLIGHTLY DEEPEN FOR THE NEXT SEVERAL HOURS. THE RAIN/SNOW LINE CURRENTLY EXTENDS JUST W OF A ODX-HDE LINE...AND IS NOT LIKELY TO MOVE VERY MUCH FARTHER E. HOURLY LIQUID AMOUNTS OF 0.19 INCHES HAVE RECENTLY BEEN MEASURE AT LOCATIONS JUST UPSTREAM ACROSS S CNTRL NEB. THIS GENERAL AREA OF PRECIPITATION IS EXPECTED TO MAINTAIN INTENSITY WITH WET HEAVY SNOW BURSTS POSSIBLE W OF THE RAIN/SNOW LINE. ..JEWELL.. 10/22/2009  MESOSCALE DISCUSSION 2122 NWS STORM PREDICTION CENTER NORMAN OK 0535 AM CDT THU OCT 22 2009 AREAS AFFECTED...UPR TX CST AND WRN LA CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 221035Z - 221200Z WATER VAPOR IMAGERY SHOWS A MID-LVL DISTURBANCE...UPR PORTION OF FORMER TC RICK...TRANSLATING RAPIDLY NEWD THROUGH S TX AHEAD OF A MID-LATITUDE WAVE OVER THE SRN HIGH PLAINS. AHEAD OF THE FORMER FEATURE...SSELY LOW-LEVEL FLOW HAS INCREASED SINCE EARLY MORNING PER VWP WITH 30-35 KT VALUES BETWEEN 0-3 KM. RESULTANT MOISTURE TRANSPORT HAS CAUSED BOUNDARY LAYER DEW POINTS TO SURGE INTO THE LWR-MID 70S ALONG/S OF THE WRMFNT...ROUGHLY LOCATED KUTS-KLCH AT 10Z. BAND OF TSTMS...INCLUDING ISOLD ROTATING CELLS...HAS INCREASED THIS MORNING...WITHIN A BROADER CONFLUENCE ZONE BETWEEN THE APCHG UPR DISTURBANCE AND ANTICYCLONIC FLOW OVER THE CNTRL/ERN GULF. INSPECTION OF VWP/S SUGGESTS THAT 0-1KM SRH WAS HIGHEST ALONG THE UPR TX CST NEWD INTO THE SABINE RVR VLY /AOA 250 M2 PER S2/ INVOF THE RETREATING WRMFNT. THUS...AS CELLS MOVE OFF THE GULF AND APCH THE ZONE OF ENHANCED SRH...EXPECT THAT THERE WILL BE A LOW PROBABILITY /NON-ZERO THREAT/ FOR A BRIEF TORNADO...PARTICULARLY NE OF THE HOUSTON METRO AREA EWD TO KLCH AND NWD TO KLFK AND KPOE. ..RACY.. 10/22/2009  URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 771 NWS STORM PREDICTION CENTER NORMAN OK 555 AM CDT THU OCT 22 2009 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTHERN AND WESTERN LOUISIANA SOUTHEAST TEXAS COASTAL WATERS EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 555 AM UNTIL 100 PM CDT. TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. |
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