Scientific Forecaster Discussion

NWS Discussion
			
				

Area forecast discussion 
National Weather Service Albuquerque nm 
954 PM MDT Thursday may 23 2013 


Update... 
showers and storms propagating northward into NE nm as low level 
moisture pushes to the east slopes of the central Montana chain. Southeast 
winds blowing at ksaf with corresponding increase in dewpoint and kabx 
velocity product showers boundary likely to break into the abq 
metropolitan prior to 11pm-midnight. Consequently have raised probability of precipitation in NE 
nm as well as added some patchy fog after midnight...raised some 
min temperatures central and east and adjusted winds. Also spread some 
isolated probability of precipitation west of the central Montana chain where unable to rule out 
a cell or two developing. Zone forecast product already out. 


&& 


Previous discussion...541 PM MDT Thursday may 23 2013... 


Breezy to windy condiitons will persist into the early evening 
before diminishing. Some gusts to 25 to 30 knots will be common. 
Showers will struggle to develop over much of the central to western 
parts of New Mexico...but any precipitation that develops here will 
evaporate before reaching the ground. This will enhance localized 
wind gusts. In the eastern tier of the state...the dryline will be 
infiltrating the state...bringing additional potential for 
stronger showers/storms. Some brief downpours...hail...and strong 
winds will be possible with these better organized storms through 
the evening. Some precipitation may last well into the evening in 
the east...and as moisture continues to work into the state some 
low stratus clouds will likely develop by the early morning hours 
Friday. This will introduce some MVFR to IFR ceilings over the 
plains with some isolated pockets of LIFR ceilings. 


52 


Previous discussion...305 PM MDT Thursday may 23 2013... 
finally some precipitation over the eastern plains the next few 
days and hopefully decent rainfall amounts. The west will remain 
dry and very warm with gusty winds. 


Back door front moved south through Clovis and Melrose and west to 
Las Vegas and Clines Corners but has stalled to the south and has 
moved back east of lvs and cqc with dewpoints lowering again. The 
higher dewpoints...in the 40s...are hugging the nm...Texas border and 
NE nm. Will carry chance probability of precipitation in this area and mention possible 
severe weather per Storm Prediction Center guidance. Decent low level shear over the 
northeast this evening along with the moist and unstable airmass. 
Tornado and severe thunderstorm watches just east and south of our 
County Warning Area currently. Some lingering showers and storms late tonight over 
the east. 


Low level moisture should back to the east slopes of the central 
mountains late tonight. Could even see a seepage of East Canyon 
wind into the Rio Grande Valley toward daybreak. This moisture 
should mix out by Friday PM but decided to put a few dry storms in 
for the Jemez Mountains...partly based on Storm Prediction Center lightning potential. 
Also unstable even over the west Friday with steep lapse rates. Best 
probability of precipitation Friday will be along the east slopes of the central mountains 
and along the far eastern plains. Will mention gusty winds and 
small hail with the storms near the Texas border. Continued warm and 
dry in the west...aside from possible sprinkles in the jemez. 


Saturday will be similar to Friday with perhaps a bit of a downward 
trend in convection...both in coverage and perhaps intensity. Will 
only carry isolated probability of precipitation even near the Texas border. A bit stronger 
and more west flow Sunday and Monday will lead to a drying trend 
for the east...with only isolated showers and storms Sunday near 
the Texas border and a dry and very warm forecast area wide for 
Memorial Day. 


A slow moving trough of low pressure will approach nm Tuesday and 
cross the state Wednesday. This will mean some cooling in the northwest 
and perhaps some showers. Winds may increase over the southern 
areas. It should be dry for the end of next week. Chj 


Fire weather... 


..critical to near critical conditions continue through the 
Holiday weekend... 


Upper level low continuing to hang out off the Pacific coast. 
Shortwave ridging across the state leaving most locations with 
southwest flow aloft. Critical fire weather conditions through the 
evening in western nm along the Arizona border where winds are gusting 
into the 30's and min relative humidity values are in the single digits. Gusty 
winds prevalent across most of the state through this evening. 
Dryline activity expected to begin in the next hour or two across 
the eastern plains with some potentially strong storms through 
this evening. Activity expected to wane by early morning hours 
Friday with dryline moving even farther west bringing an increase 
in relative humidity values from the Central Mountain chain eastward. This 
westward push of moisture will create excellent overnight relative humidity 
recoveries along the eastern plains while the central and west 
overnight recoveries are poor. Some low clouds are also possible 
at eastern locations through Friday morning. 


Friday the upper level pattern has very little change with continued 
southwest flow aloft. Forecasted high temperatures to be 5 to 10 
degrees above seasonal normals for the day. Ventilation rates will 
be excellent areawide with wind speeds increasing throughout the 
early afternoon areas at all locations. The increased wind speeds 
along with min relative humidity values in the single digits central and west will 
lead to a few hours of spotty critical fire weather conditions in 
the lower Rio Grande Valley as well as the west Central Plateau. 
With the dryline set up along the central mountains bringing in 
higher moisture the chance for wetting precipitation increases 
Friday afternoon with thunderstorm and shower activity expected in 
the east. Overnight relative humidity recoveries will again be excellent in the 
east and poor in the west. 


As we move into the weekend the upper level low deepens over the 
Pacific northwest. Saturday high temperatures very similar to 
fridays staying 5 to 10 degrees above normal. Chance for wetting 
precipitation also continues with a slight chance of storm 
development in the east. Wind speeds will again pick up areawide 
with excellent ventilation expected. Min relative humidity values remaining in the 
single digits central and west and in the 20's in the east. Spotty 
critical fire weather conditions are expected again during the late 
afternoon hours along the far west border with Arizona as well as 
the northeast Highlands. Sunday will see a slight uptick in winds 
central and east as the low shifts across the state. Overnight relative humidity 
recoveries continue excellent in the east and poor elsewhere. High 
temperatures trending up across the east and slightly lowering in 
the west. Any thunderstorm activity Sunday expected to hug the 
eastern border along Texas with mostly sunny skies returning 
areawide. Ventilation rates will be excellent with min relative humidity values in 
the teens and single digits expected at all locations. Critical fire 
weather conditions are expected for a couple hours in the northwest 
Highlands through the afternoon hours. 


Into the beginning of the week the upper level low continues to 
deepen and begins to move south and slightly eastward into Tuesday. 
Wind speeds will begin to pick up as this feature makes its way into 
the state. By Wednesday the low is forecast to be over northern nm. 
This will bring chances for precipitation back to northern nm during 
this time frame. As this features exits models are not in good 
agreement as to what is left behind for the latter half of the week. 


&& 


Abq watches/warnings/advisories... 
none. 


&& 


$$