Squall Line to affect the Delta today

The Storm Prediction Center has issued a Moderate Risk for the Delta today. I expect a linear feature given the wind profile with heavy rain. Expect 2 inches in the strongest Thunderstorms.


The SPC has issued a Public Severe Weather Outlook that I have posted here for your convenience. 

ZCZC SPCPWOSPC ALL
   WOUS40 KWNS 040905
   ALZ000-MSZ000-TNZ000-041800-
   
   PUBLIC SEVERE WEATHER OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0405 AM CDT MON APR 04 2011
   
   ...WIDESPREAD SEVERE THUNDERSTORMS EXPECTED OVER PARTS OF THE LOWER
   MISSISSIPPI VALLEY INTO TENNESSEE VALLEY TODAY INTO TONIGHT...
   
   THE NWS STORM PREDICTION CENTER IN NORMAN OK IS FORECASTING THE
   DEVELOPMENT OF WIDESPREAD DAMAGING WINDS AND POSSIBLY A FEW
   TORNADOES OVER PARTS OF THE LOWER MISSISSIPPI VALLEY INTO TENNESSEE
   VALLEY TODAY INTO TONIGHT.
   
   THE AREAS MOST LIKELY TO EXPERIENCE THIS ACTIVITY INCLUDE
   
          NORTHERN ALABAMA
          NORTHERN AND CENTRAL MISSISSIPPI
          WESTERN AND MIDDLE TENNESSEE
   
   ELSEWHERE...SEVERE STORMS ARE ALSO POSSIBLE FROM THE UPPER OHIO
   VALLEY TO THE GULF COAST STATES.
   
   A STRONG UPPER-LEVEL STORM SYSTEM WITH ASSOCIATED JET STREAM WINDS
   GREATER THAN 100 MPH WILL PROGRESS FROM THE GREAT PLAINS THROUGH THE
   OHIO AND TENNESSEE VALLEYS AND GULF COAST STATES TODAY AND TONIGHT. 
   A COLD FRONT WILL ACCOMPANY THE UPPER-AIR STORM SYSTEM WITH THIS
   FEATURE PROVIDING THE FOCUS FOR SEVERE THUNDERSTORMS IT SURGES
   EASTWARD THROUGH THE REGION.  
   
   THROUGH THE REMAINDER OF THE MORNING...EXPECT LOCATIONS FROM THE MID
   MISSISSIPPI VALLEY SOUTHWESTWARD INTO ARKANSAS...EASTERN TEXAS AND
   LOUISIANA TO BE IMPACTED BY A FEW SEVERE STORMS.  BY AFTERNOON...THE
   FRONT WILL ENCOUNTER A WARMER AND MORE HUMID AIR MASS STREAMING
   NORTHWARD FROM THE GULF OF MEXICO THROUGH THE LOWER MISSISSIPPI
   VALLEY INTO TENNESSEE VALLEY.  THIS WILL RESULT IN A MARKED INCREASE
   IN SEVERE THUNDERSTORMS ALONG THE COLD FRONT.  THESE STORMS WILL BE
   CAPABLE OF WIDESPREAD DAMAGING WINDS AND PERHAPS A FEW TORNADOES AS
   THEY ADVANCE ACROSS THE TENNESSEE VALLEY AND GULF COAST STATES TODAY
   INTO TONIGHT.
   
   STATE AND LOCAL EMERGENCY MANAGERS ARE MONITORING THIS DEVELOPING
   SITUATION. THOSE IN THE THREATENED AREA ARE URGED TO REVIEW SEVERE
   WEATHER SAFETY RULES AND TO LISTEN TO RADIO...TELEVISION...AND NOAA
   WEATHER RADIO FOR POSSIBLE WATCHES...WARNINGS...AND STATEMENTS LATER
   TODAY.
   
   ..MEAD.. 04/04/2011

Notice how the Solid Red Line (Temperature) Cools rapidly with height. This is conducive for severe weather.

Current Surface Observations reveal a Southwest Flow, which will limit rotation of storms.