Flood Watch

Monday, November 21st 2011, 5:30 am
By: Alan Crone

Expect a cloudy and cool day with highs in the mid 40s across northern Ok and some lower to mid 50s across the southern portions of the state.  A flood watch is underway through early tomorrow morning and periods of heavy rainfall will be likely later tonight across the flood watch area.  There will also be a chance of some strong to severe storms along and south of the I-40 corridor.  The main threat will be hail, but a few surface based storms may develop near the Red River valley or across far east central Ok and west central Arkansas.  

The cold front rolled over the area late Saturday evening bringing a very cold air mass into the state.  The boundary is located across north Texas this morning and will attempt to slowly move northward during the day as the main upper level system to our west draws closer to the region.  The cold air mass will more than likely re-enforce the boundary keeping it well south of our area.  This would keep our temperatures across northern OK in the mid 40s. If the boundary moves more northward than forecasted, our temps will move into the lower 50s.  I think the boundary will stay south and we'll be in store for another cold day. 

The rain chances will continue throughout the day, but the higher likelihood will be developing by early afternoon and evening as the main upper level system arrives.

This will spread rain and storms across southwestern and central Ok into the eastern pat of the state. The parameters will be favorable for heavy rainfall behind the boundary and the flood watch area may receive 2 to 5 inches of rain with some localized amounts near 8 inches across far southeastern OK.  Portions of Pushmataha and Leflore County have received over 2 inches of rain last night and early this morning.  

The system will be exiting the state early tomorrow morning and we should be left with cloudy and cool conditions.  Lows in the lower 40s will move into the mid 50s Tuesday afternoon with mostly cloudy sky.  The clouds will attempt to clear out late tomorrow night and the fog could become an issue by early Wednesday morning for a few hours. 

Thursday, Thanksgiving Day, appears windy and warm with highs in the upper 60s or even the lower 70s.  But another fast moving system will be approaching Friday into Saturday bringing a round of rain and storms Friday afternoon to the region. 

Additional cool air will slide across the state Friday night into Saturday keeping the weekend on the cool side.