Record Cool Weather!

Now we can say fall is here!  Some very pleasant temperatures have settled into the state and it looks like extreme heat is over.  Even seasonably warm temperatures in October can be tolerated.

On the 26th… the high temperature in Okarche only reached 68 degrees which set a record for the lowest high temperature on the date.  The previous record was 69 degrees set in 1993.

This morning (27th) … the low temperature was a record setting 43 degrees.  The previous record low for today’s date was 49 degrees set in 1996 and reached again in 2000.

It looks like the record temperatures are over for awhile.  Comfortable temperatures and dry weather are in the forecast for the next week.

Supercell/Yearly Thunder Average Reached

Thunderstorms formed in northwest Oklahoma during the afternoon and evening hours of the 15th.  Once again, we found ourselves missing out on significant rain in Okarche, but the storms did come close enough to allow us to hear thunder.  Despite being almost five inches of rain below normal, our total number of days with thunder this year is now 48.  48 just happen to be our yearly average.  So, with three and a half months of the year to go, we have already made our average.  While November and December are usually slow in the thunder department, it still seems likely that we could push or exceed 60 days with thunder in 2010.  http://www.okweatherwatch.com/wx/thunder.JPG

I observed one supercell thunderstorm on Wednesday which appeared close to producing a tornado as it moved southeast out of eastern Major County into southwest Garfield County.

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King Lightning

We are winding down the Summer lightning season, but before we call it good – we have what appears to be several chances of activity this week.  Including last evening when a supercell storm formed near Watonga and moved slowly southeastward.

I totally misjudged this event and should have been out the door an hour earlier.  Still, I was able to see some decent cloud to ground lightning and anvil crawlers before the storm rapidly weakened.

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Part of what caused my distraction this afternoon was dealing with an addition to the household.  Meet “King” -

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More images of King can be found at
http://www.pbase.com/okweatherwatch/king

Thanks for the fun Hermine!

Well… it was fun to keep track of “Hermine” as it made its way

from the western gulf – through Texas – and finally through Oklahoma.

Mainly because, it just doesn’t happen very often.  And what was more cool,

was that Hermine managed to make it to Okarche.  Right on top of.  Yes,

for a period this early morning… winds went totally calm and we had the

lowest pressure in the state as the remnant low passed overhead between

2 and 3 A.M.  This “eye” wasn’t nearly as memorable of an event as what people

along the coastal waters get to see… but remember, this is central Oklahoma for

goodness sakes.  Goodbye Hermine – glad to make your acquaintance… and we

appreciated what rain we got for sure!

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Remnants of “Hermine” poised to move over Okarche tonight…

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A well defined low pressure area has developed late this evening near the southwest corner of Canadian County… or about 25 miles southwest of Okarche.  In all likelihood… this low will track over Okarche during the next few hours.

Most of the heavy precipitation has been confined well east and south of the low center.  So, we don’t expect much more in the way of heavy rain tonight.

Winds in Okarche did get gusty out of the east as the pressure has fallen to 29.72 inches.

As of midnight… 1.13 inches of rain has fallen.  Combined with the 0.54 of an inch yesterday… this storm total has been brought up to 1.67 inches.  A bit more rain is possible after midnight….but it shouldn’t be much.

“Hermine” center becoming difficult to locate

Trying to find the exact center of the low pressure area is becoming more and more difficult.  There are still radar indications that it could be located over eastern Caddo County… however, there is a strung out area of low pressure in mesonet data that extends east across Grady County.  The lowest pressure is at Chickasha and it is believed that this is where the center is likely reorganizing.  To what extent it reorganizes remains to be seen.  Dry air is evident on water vapor satellite imagery spreading into southwest Oklahoma which will continue to erode precipitation on the southwest side of the system.

An arc of heavy thunderstorms extends from northern Grady County to Pontotoc County to Marshall County.  A small supercell storm formed near the southeast corner of McClain County… however, this storm has weakened as it has moved into the southwest corner of Pottawatomie County.

A heavy rain and flooding threat will continue south and east of the metro area for the next several hours.

At 9:50 P.M…. the lowest pressure was 29.70 inches.

“Hermine” still in Comanche County

While I continue to refer to this system as “Hermine” – it has been many hours since it has been recognized by the National Hurricane Center as an organized system – having lost the necessary tropical characteristics to be considered a Tropical Depression.  Still, I feel that it warrants being referred to as something other than just “a low pressure area”.  So, I will continue to call this system “Hermine”.

At 8:50 P.M., careful examination of data from the TOKC TDWR shows a circulation center very close to Elgin in Comanche County.  This matches well with data from the Oklahoma Mesonet – meaning that Hermine has drifted only a few miles north over the past hour.  Three hour pressure falls are greatest over northern Grady County and Hermine should begin to move more to the northeast soon.

Rainfall totals are starting to become impressive with a swath of 4 to greater than 5 inch amounts observed from southern McClain to southern Grady Counties.  Also… greater than 4 inches of rain has fallen in parts of Love County.

The tornado threat has lessened over the past hour… but a few small supercells are still noted from eastern Love County northward to eastern Garvin and western Pontotoc Counties.

The greatest rainfall amount today: 5.09 inches at Acme in Grady County.

Current lowest pressure: 29.68 inches.

The highest wind with the system occurred around Noon at Ninnekah in Grady County – 47 M.P.H.

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“Hermine” getting ready to move northeast out of Comanche County

At 7:50 P.M., the center of the circulation was over eastern Comanche County – just south of Elgin.  This indicates a little turn to the right over the past hour.  Very heavy rainfall continues in Grady, McClain and Garvin Counties where a Flash Flood Warning is in effect.

A Tornado Warning is in effect for eastern Love County where an isolated supercell is moving quickly northeast.  This storm produced a tornado earlier near Gainesville, Texas.

The lowest pressure remains near 29.68 inches.

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“Hermine” makes it to Oklahoma

At 5:50 P.M… the center of what is left of “Hermine” has crossed the Red River into southwest Oklahoma.  The circulation is very close to Grandfield where winds have become calm and the pressure has dropped to 29.69 inches.

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Most of the heavy rainfall has been confined to southern Oklahoma where several places have seen over three inches of rain during the past 24 hours.

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