STORM2K • View topic - Heat Burst strikes OK/KS late Friday night ...

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 Post subject: Heat Burst strikes OK/KS late Friday night ...
PostPosted: Sat Jun 12, 2004 1:43 pm 
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Joined: Wed Feb 05, 2003 6:27 pm
Posts: 10619
Location: Summerville, SC
Once in a while, a rare event called a heat burst occurs ...

More information about heat bursts can be found by CLICKING HERE

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1128 PM CDT FRI JUN 11 2004

OKZ044-045-120445-
COTTON OK-JEFFERSON OK-
1128 PM CDT FRI JUN 11 2004

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR COTTON AND JEFFERSON
COUNTIES.

AT 1130 PM... AN AREA OF STRONG WINDS FROM 40 TO 50 MPH... WITH SOME
GUSTS APPROACHING 60 MPH... WAS LOCATED ACROSS MUCH OF WICHITA...
NORTHERN ARCHER AND CLAY COUNTIES IN NORTHERN TEXAS.

THESE WINDS APPEARED TO BE ASSOCIATED WITH A HEAT BURST OCCURING
UNDERNEATH THE NORTHERN EDGE OF THE LARGE COMPLEX OF THUNDERSTORMS
OVER THROCKMORTON AND JACK COUNTIES.

STRONG SOUTH TO SOUTHWEST WINDS MAY DEVELOP THROUGH MIDNIGHT ACROSS
PARTS OF COTTON AND JEFFERSON COUNTIES. WINDS FROM 35 TO 50 MPH...
WITH SOME GUSTS UP TO 60 MPH HAVE BEEN COMMON IN THE WICHITA FALLS
AREA. JUST AS IMPORTANT... THESE WINDS HAVE PASTED FOR 30 TO 60
MINUTES AT ANY ONE LOCATION... AND WILL HAVE THE POTENTIAL TO DO
MINOR DAMAGE TO TREES AND POWER LINES.

A HIGH WIND WARNING MAY BE ISSUED WITHIN THE NEXT HOUR.

$$
MILLER


163
NWUS54 KOUN 120549
LSROKC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1249 AM CDT SAT JUN 12 2004

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..

1150 PM NON-TSTM WND GST WICHITA FALLS 33.91N 98.50W
06/11/2004 70 MPH WICHITA TX PUBLIC

WIND GUST ESTIMATED BY PUBLIC AT SOUTHWEST PKWY AND TAFT
BLVD. ASSOCIATED WITH HEAT BURST EVENT.


PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1239 AM CDT SAT JUN 12 2004

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..

1050 PM NON-TSTM WND GST IOWA PARK 33.96N 98.68W
06/11/2004 51 MPH WICHITA TX AMATEUR RADIO

WIND GUST IN IOWA PARK ASSOCIATED WITH HEAT BURST. SOME
POWER OUTAGES REPORTED BY SKYWARN SPOTTERS.

1120 PM NON-TSTM WND GST KAMAY 33.85N 98.82W
06/11/2004 60 MPH WICHITA TX TRAINED SPOTTER

WIND GUST ASSOCIATED WITH HEAT BURST. REPORTED BY SKYWARN
SPOTTERS.

1124 PM NON-TSTM WND GST IOWA PARK 33.96N 98.68W
06/11/2004 50 MPH WICHITA TX TRAINED SPOTTER

SUSTAINED WINDS ASSOCIATED WITH HEAT BURST. REPORTED BY
SKYWARN SPOTTERS.

1126 PM NON-TSTM WND GST WICHITA FALLS 33.91N 98.50W
06/11/2004 64 MPH WICHITA TX OFFICIAL NWS OBS

WIND GUST MEASURED BY SHEPPARD AFB ASOS. ASSOCIATED WITH
HEAT BURST EVENT.

1126 PM NON-TSTM WND GST IOWA PARK 33.96N 98.68W
06/11/2004 56 MPH WICHITA TX TRAINED SPOTTER

MEASURED WIND GUST ASSOCIATED WITH HEAT BURST. REPORTED
BY SKYWARN SPOTTERS.

1146 PM NON-TSTM WND GST WICHITA FALLS 33.91N 98.50W
06/11/2004 72 MPH WICHITA TX TRAINED SPOTTER

MEASURED WIND GUST AT HIGH SCHOOL STADIUM ON SOUTHWEST
SIDE OF WICHITA FALLS. ASSOCIATED WITH HEAT BURST EVENT.
REPORTED BY SKYWARN SPOTTERS


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 Post subject:
PostPosted: Sat Jun 12, 2004 1:56 pm 
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Joined: Mon Jun 07, 2004 11:18 pm
Posts: 108
Location: Florida
Heat Bursts are similar to Microbursts. The main difference is the level at which the Heat Burst originates in a thunderstorm is much higher than a microburst.


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 Post subject:
PostPosted: Sat Jun 12, 2004 2:06 pm 
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Joined: Wed Feb 05, 2003 6:27 pm
Posts: 10619
Location: Summerville, SC
There was an event a while back that brought Lawton, OK's temperature from 90º to 104º between 10 and 11 pm at night...before falling back off to the surrounding areas ...

Also the air associated with a heat burst is very, very dry...

KSPS last night ...

0452z- 83ºF : 70F Dewpoint.

0537z- 94ºF : 39F Dewpoint.

Incredible Stuff ...

SF


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 Post subject:
PostPosted: Sat Jun 12, 2004 2:14 pm 
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Joined: Mon Jun 07, 2004 11:18 pm
Posts: 108
Location: Florida
That's a temperature change of +11*F and Dewpoint change of -31*F. It's very impressive.


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 Post subject: ..and another heat burst in Texas Saturday night...
PostPosted: Sun Jun 13, 2004 10:35 am 
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Joined: Sat Sep 27, 2003 6:48 pm
Posts: 15677
Location: Niagara Falls, Ontario, Canada
SUNDAY june 13th, 2004

...HEAT BURST STRIKES SAN ANGELO, TEXAS...

A RELATIVELY RARE WEATHER PHENOMENON KNOWN AS A HEAT BURST STRUCK
SAN ANGELO BETWEEN 8 PM AND 9 PM ON SATURDAY EVENING...JUNE 12TH.
TEMPERATURES CLIMBED...RELATIVE HUMIDITY VALUES DROPPED...AND WINDS
GUSTED TO NEARLY 60 MPH AS THE HEAT BURST MOVED ACROSS THE AREA.
AFFECTING MAINLY THE SOUTH SIDE OF THE CITY...DATA FROM NATIONAL
WEATHER SERVICE EQUIPMENT AT MATHIS REGIONAL AIRPORT SHOWED THE
EFFECTS FROM THE HEAT BURST:

AT 820 PM...THE TEMPERATURE HAD COOLED TO 83 DEGREES AND THE
RELATIVE HUMIDITY STOOD AT 53 PERCENT.

JUST 17 MINUTES LATER...AT 837 PM...THE TEMPERATURE HAD CLIMBED BACK
TO 90 DEGREES...AND WHEN COMBINED WITH A DEWPOINT THAT HAD DROPPED
TO 44...THE RELATIVE HUMIDITY PLUMMETED TO A BONE DRY 20 PERCENT.

TEMPERATURE AND RELATIVE HUMIDITY READINGS RETURNED TO THEIR PRE
HEAT BURST READINGS BY 854 PM ...ANOTHER 17 MINUTES SINCE THE HEART
OF THE HEATBURST.

HEAT BURSTS ARE CAUSED BY DISSIPATING THUNDERSTORMS AND MOST OFTEN
FORM IN THE PLAINS STATES DURING THE LATE SPRING AND EARLY SUMMER.
IF ATMOSPHERIC CONDITIONS ARE JUST RIGHT...THE DECAYING THUNDERSTORM
WILL PRODUCE A WEAK DOWNBURST FROM THE MID LEVELS OF THE STORM. AS
THIS AIR SINKS...IT PICKS UP SPEED AND RAPIDLY HEATS...AND A HEAT
BURST IS BORN. THE HEAT BURST THAT STRUCK SAN ANGELO WAS A MILD ONE.
A HEATBURST THAT STRUCK PARTS OF CENTRAL AND SOUTHWEST OKLAHOMA IN
1999 DROVE TEMPERATURES OVER THE 100 DEGREE MARK AS WINDS IN EXCESS
OF 100 MPH BLASTED THROUGH THE AREA.

-justin-


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