National Weather Service United States Department of Commerce

Thunderstorms, Some Severe, and Heavy Rainfall Across the East

A cold front moving into the eastern U.S. will bring widespread thunderstorms and locally heavy rain to the eastern states. Excessive rain will be possible across the Mid-South and widespread flash flooding will be possible. Severe thunderstorms with damaging winds may occur in the Mid-Atlantic and Northeast. Out west, windy, dry conditions are keeping fire weather threats elevated-to-critical. Read More >

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How to Read The F6 Table

Preliminary Local Climatological Data (F6)
(updated daily around 2am)
  • See below for an example of the table data

    Monthly Summary Data Included
  • High, Low, and Average Temperatures and Departure from Normal
  • Heating and Cooling Degree Days
  • 24 hour Rainfall and Snowfall Amounts
  • Average 24 hour Wind Speed
  • Fastest and Peak Wind Speed and Direction
  • Logs of Specific Weather Occurances, such as Hail, Sleet, Fog, Thunder, Glaze, Dust, Smoke, Blowing Snow, and Tornado
Example monthly F6...

PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6)

                                          STATION:   TULSA OKLAHOMA
                                          MONTH:     MAY
                                          YEAR:      2004
                                          LATITUDE:   36 12 N                   
                                          LONGITUDE:  95 54 W                   

  TEMPERATURE IN F:       :PCPN:    SNOW:  WIND      :SUNSHINE: SKY     :PK WND 
================================================================================
1   2   3   4   5  6A  6B    7    8   9   10  11  12  13   14  15   16   17  18
                                          AVG MX 2MIN
DY MAX MIN AVG DEP HDD CDD  WTR  SNW DPTH SPD SPD DIR MIN PSBL S-S WX    SPD DR
================================================================================

 1  62  48  55 -10  10   0 0.09  0.0    0 11.6 18  20   M    M   8 1      29  20
 2  72  42  57  -8   8   0 0.00  0.0    0  8.1 24 350   M    M   2        30 350
 3  67  39  53 -13  12   0 0.00  0.0    0  6.9 14 180   M    M   2         M  M 

Here is a brief listing of what each of the columns holds:

Column 1 - Day of the Month
Column 2 - Maximum Temperature for the day (Midnight to Midnight CST)
Column 3 - Minimum Temperature for the day (Midnight to Midnight CST)
Column 4 - Average Temperature (MAX+MIN/2)
Column 5 - Daily Departure from Normal Temperature  
Column 6A - Heating Degree Days (COLUMN 4 - 65 degrees) (zero if col 4 > 64)
Column 6B - Cooling Degree Days (65 degrees - COLUMN 4) (zero if col 4 < 66)
Column 7 - Precipitation (rain or melted snow/sleet/ice) in hundreths of inches
Column 8 - Daily Snowfall (in tenths of inches).
Column 9 - Depth of the Snow on the ground (everything).
Column 10- Average Wind Speed for the Day
Column 11 - Maximum 2-min-average wind speed during the Day
Column 12 - Average Wind Direction for the Day (360 degree compass)
Column 13 - Minutes of Sunshine (n/a)
Column 14 - Percent of possible sunshine (n/a)
Column 15 - Sky cover Average Sunrise to Sunset (in tenths of sky covered by clouds)
Column 16 - Any Weather (Numeric Codes found on the form)
Column 17 - Peak Wind Speed
Column 18 - Direction that peak wind came from (360 degree compass)

M - Missing data