PM Sun Will Crank Up the Heat

LATE MORNING UPDATE

At late morning (10:21am CDT), isolated strong thunderstorms were moving out of the SE corner of W. TN into extreme NE MS.  Most of the morning rains should be out of W.TN by the noon hour.  Clearing skies will open the door for sunshine and temperature increases.  Highs in the 90s today with the high humidity in the air will result in heat index values in the 100-105º range. 

Scattered Rains Continue This Morning

“Heat Index” Will Be Used Frequently the Next Several Days

Heat Index (Apparent Temperature) Chart

The Heat Index (HI) is the temperature the body feels when heat and humidity are combined. The chart below shows the HI that corresponds to the actual air temperature and relative humidity. (NOTE: This chart is based upon shady, light wind conditions. Exposure to direct sunlight can increase the HI by up to 15�F.)

(Due to the nature of the heat index calculation, the values in the tables below have an error of +/- 1.3F.) 

Relative Humidity (in percent)
Air Temp (in F)		0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
	140	125
	135	120	128
	130	117	122	131
	125	111	116	123	131	141
	120	107	111	116	123	130	139	148
	115	103	107	111	115	120	127	135	143	151
	110	99	102	105	108	112	117	123	130	137	143	150
	105	95	97	100	102	105	109	113	118	123	129	135	142	149
	100	91	93	95	97	99	101	104	107	110	115	120	126	132	138	144
	95	87	88	90	91	93	94	96	98	101	104	107	110	114	119	124	130	136
	90	83	84	85	86	87	88	90	91	93	95	96	98	100	102	106	109	113	117	122
	85	78	79	80	81	82	83	84	85	86	87	88	89	90	91	93	95	97	99	102	105	108
	80	73	74	75	76	77	77	78	79	79	80	81	81	82	83	85	86	86	87	88	89	91
	75	69	69	70	71	72	72	73	73	74	74	75	75	76	76	77	77	78	78	79	79	80
	70	64	64	65	65	66	66	67	67	68	68	69	69	70	70	70	70	71	71	71	71	72

 

Heat Index	General Effect of Heat Index on People in Higher Risk Groups
80 to 89o – Very Warm	Fatigue possible with prolonged exposure and/or physical activity.
90 to 104o – Hot	Sunstroke, heat cramps and heat exhaustion possible with prolonged exposure and/or physical activity.
105 to 129o – Very Hot	Sunstroke, heat cramps or heat exhaustion likely, and heatstroke possible with prolonged exposure and/or physical activity.
130o or higher – Extremely Hot	Heat/sunstroke highly likely with continued exposure.

Higher Rain Chances For Some Today

Daybreak Weather Summary

Stationary boundary in the neighborhood combined with a complex of showers and thunderstorms over MO will be responsible for increased rain chances today, especially across NW TN.  A few storms could contain gusty winds this afternoon.  Heat and humidity will take a stranglehold on the area once again for the upcoming weekend.

A Comfortable Morning

Daybreak Weather Summary

Only a few passing clouds at sunrise across West TN.  Morning lows were comfortable for July to say the least.  Lows ranged from 57º at Paris, 58º at Huntingdon to 64º at Dyersburg and Selmer.  High pressure over the Midwest will provide a warm day but without the humid air.  That has been pushed south–for the time being.  Highs will be around 90º, much like Wednesday.

Hurricane Dolly Making Landfall NE of Brownsville, TX

Daily Rain Chances … at Least!

Hurricane Dolly 40 Mi East of Brownsville TX at 8 AM CDT

*Slight Risk* Area Pushed a Little Further South

SEVERE WEATHER OUTLOOK
WEST TENNESSEE WEATHER ONLINE JACKSON TN
815 AM CDT TUE JUL 21 2008

* WEATHER HAZARDS EXPECTED AND TIMING

DAMAGING THUNDERSTORM WINDS ARE POSSIBLE.  THE GREATEST THREAT WILL BE BETWEEN 2 PM AND 9 PM.  

* AREAS AFFECTED

IN WEST TENNESSEE…A *SLIGHT RISK* OF SEVERE THUNDERSTORMS
EXISTS NORTH OF A LINE FROM RIPLEY TO BOLIVAR.

* DISCUSSION

A HOT, HUMID AIR MASS IN PLACE OVER THE REGION WILL SERVE AS FUEL FOR THUNDERSTORMS WHICH COULD BECOME SEVERE THIS AFTERNOON AND EVENING AS A COLD FRONT WILL SAG SOUTH INTO WEST TENNESSEE BY TONIGHT. 

* ACTION STATEMENT

AREA RESIDENTS SHOULD STAY ABREAST OF THE LATEST FORECASTS ESPECIALLY THIS AFTERNOON AND EVENING FOR THE POTENTIAL FOR WATCHES AND WARNINGS.

WTWO/SPC/NWS

Heat Advisory Continues; Strong/Severe Storms Possible Today

Daybreak Weather Summary

Satellite images indicating some high clouds moving into northern W.TN.  These clouds are associated with a complex of thunderstorms moving SE from MO.  The main weather story today will the complex of thunderstorms and the increase rain chances today.  A few t’storms may be severe.  A slight risk of severe thunderstorms exists for areas north of a line from Ripley to Savannah.  Large hail and damaging winds will be the main threat. Otherwise, W. TN is under a heat advisory for the second day in a row.  Highs in the upper 90s today along with the high humidity will contribute to heat index values around 105º.