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The great July heat wave of 2013


Ian

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Very, VERY excited about the upcoming week. I will save money on bottled water this week!! I have naturally cold hands because my normal body temperature is between 95.5-96.5 degrees. Anything above 97 is a fever and I have never gotten above 99 in my life. It is on days like this where my hands finally feel normal.

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cities ftw

URGENT - WEATHER MESSAGENATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC129 PM EDT MON JUL 15 2013DCZ001-MDZ011-VAZ054-160130-/O.NEW.KLWX.HT.Y.0001.130716T1600Z-130716T2300Z/DISTRICT OF COLUMBIA-SOUTHERN BALTIMORE-ARLINGTON/FALLS CHURCH/ALEXANDRIA-INCLUDING THE CITIES OF...WASHINGTON...BALTIMORE...ALEXANDRIA...FALLS CHURCH129 PM EDT MON JUL 15 2013...HEAT ADVISORY IN EFFECT FROM NOON TO 7 PM EDT TUESDAY...THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HASISSUED A HEAT ADVISORY...WHICH IS IN EFFECT FROM NOON TO 7 PM EDTTUESDAY.* HEAT INDEX VALUES...AROUND 105 DEGREES WITH TEMPERATURES IN THE  MID TO UPPER 90S...AND DEWPOINTS IN THE LOW 70S.* IMPACTS...RISK OF HEAT-RELATED ILLNESS FOR THOSE WITHOUT AIR-  CONDITIONING OR THOSE OUTDOORS FOR AN EXTENDED PERIOD.PRECAUTIONARY/PREPAREDNESS ACTIONS...A HEAT ADVISORY MEANS THAT A PERIOD OF HIGH TEMPERATURESIS EXPECTED. THE COMBINATION OF HIGH TEMPERATURES AND HIGHHUMIDITY WILL CREATE A SITUATION IN WHICH HEAT ILLNESSESARE POSSIBLE.TAKE EXTRA PRECAUTIONS IF YOU WORK OR SPEND TIME OUTSIDE.WHEN POSSIBLE...RESCHEDULE STRENUOUS ACTIVITIES TO EARLYMORNING OR EVENING. KNOW THE SIGNS AND SYMPTOMS OF HEATEXHAUSTION AND HEAT STROKE. WEAR LIGHT WEIGHT AND LOOSEFITTING CLOTHING WHEN POSSIBLE AND DRINK PLENTY OF WATER.TO REDUCE RISK DURING OUTDOOR WORK...THE OCCUPATIONAL SAFETYAND HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENTREST BREAKS IN SHADED OR AIR CONDITIONED ENVIRONMENTS.ANYONE OVERCOME BY HEAT SHOULD BE MOVED TO A COOL ANDSHADED LOCATION. HEAT STROKE IS AN EMERGENCY - CALL 9 1 1.&&$$JACKSON
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Glad you posted that, JT. I noticed the PWS near my house had a DP of 79... I had to do a double take

 

79 is still on the upper range of the possibilities for a true reading but more likely it's near 73-76. There are really two main factors that can go into bogus dew point readings. A is that dew point is really the hardest measurement of the basic weather variables to make a accurate instrument for. B is that the weather station site greatly effects dew point on a day like this because of evapotranspiration, and if the station is too close to vegetation that that can throw the dew point off. My guess is that for most stations it's a bit of a and a bit of b.

 

Lucky for me and my station, roof's don't evapotranspirate and the fan on the radiation shield helps mitigate the "A" effect.

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