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February 16-17 Storm Threat


WxUSAF

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Word of caution with the SREF plumes:   they use a formula to calculate snow-to-liquid ratios that ends up VERY generous in "cold" events.     We're going to get good ratios for sure with this event, but the snow plumes will likely look way too healthy.   I prefer to look at the QPF plumes and apply my own ratio.

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Word of caution with the SREF plumes:   they use a formula to calculate snow-to-liquid ratios that ends up VERY generous in "cold" events.     We're going to get good ratios for sure with this event, but the snow plumes will likely look way too healthy.   I prefer to look at the QPF plumes and apply my own ratio.

Thanks. What ratios do you think would be appropriate for this storm?.

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I'm a huge Bernie Rayno fan. He does not hype at all. Lays all the players out on the field and shows you why certain things could happen/should happen. Love the way he breaks it down. He also doesn't put a lot of focus on models, which is something any of us can really do. He focuses more on the energy.

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URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
312 PM EST SUN FEB 15 2015

DCZ001-MDZ011-013-014-016>018-504-506-508-VAZ030-040-051>057-501-
502-506-160415-
/O.NEW.KLWX.WS.A.0003.150216T2300Z-150217T1700Z/
/O.EXT.KLWX.WC.Y.0008.000000T0000Z-150216T1500Z/
DISTRICT OF COLUMBIA-SOUTHERN BALTIMORE-PRINCE GEORGES-
ANNE ARUNDEL-CHARLES-ST. MARYS-CALVERT-
CENTRAL AND SOUTHEASTERN MONTGOMERY-CENTRAL AND SOUTHEAST HOWARD-
SOUTHEAST HARFORD-WARREN-RAPPAHANNOCK-CULPEPER-
PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-
ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA-
KING GEORGE-NORTHERN FAUQUIER-SOUTHERN FAUQUIER-EASTERN LOUDOUN-
INCLUDING THE CITIES OF...WASHINGTON...BALTIMORE...DUNDALK...
CATONSVILLE...ANNAPOLIS...WALDORF...ST MARYS CITY...ROCKVILLE...
COLUMBIA...ELLICOTT CITY...ABERDEEN...FRONT ROYAL...CULPEPER...
MANASSAS...MANASSAS PARK...FAIRFAX...ALEXANDRIA...FALLS CHURCH...
FREDERICKSBURG...WARRENTON...LEESBURG...ASHBURN
312 PM EST SUN FEB 15 2015

...WIND CHILL ADVISORY NOW IN EFFECT UNTIL 10 AM EST MONDAY...
...WINTER STORM WATCH IN EFFECT FROM MONDAY EVENING THROUGH
TUESDAY MORNING...

THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HAS
ISSUED A WINTER STORM WATCH...WHICH IS IN EFFECT FROM MONDAY
EVENING THROUGH TUESDAY MORNING.

* PRECIPITATION TYPE...SNOW.

* ACCUMULATIONS...POTENTIAL FOR 5 OR MORE INCHES.

* TIMING...SNOW IS EXPECTED TO DEVELOP MONDAY EVENING AND CONTINUE
THROUGH TUESDAY MORNING. HEAVIEST SNOW IS EXPECTED MONDAY NIGHT
AND EARLY TUESDAY MORNING.

* WIND CHILL...5 TO 10 BELOW ZERO TONIGHT AND MONDAY MORNING.

* TEMPERATURES...SINGLE DIGITS TONIGHT. HIGHS IN THE LOWER 20S
MONDAY. TEMPERATURES IN THE TEENS MONDAY NIGHT AND TUESDAY
MORNING.

* WINDS...NORTHWEST 15 TO 25 MPH WITH GUSTS TO 35 MPH THIS
EVENING...DIMINISHING TO 10 TO 15 MPH OVERNIGHT. WINDS BECOMING
SOUTHEAST 5 TO 10 MPH MONDAY NIGHT.

* IMPACTS...THE COMBINATION OF GUSTY WINDS AND COLD TEMPERATURES
WILL CONTINUE TO MAKE DANGEROUS WIND CHILLS THAT CAN QUICKLY
CAUSE HYPOTHERMIA AND FROST BITE THROUGH MONDAY MORNING.
BEGINNING MONDAY EVENING...ROADS WILL BECOME SNOW COVERED AND
SLIPPERY WITH VISIBILITIES BEING REDUCED TO ONE HALF MILE OR
LESS AT TIMES. THE COMBINATION OF SNOW COVERED ROADS AND LOW
VISIBILITY WILL MAKE TRAVELLING DANGEROUS.

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