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Yesterday was the 29th consecutive day with below normal (warm) national gas-weighted HDDs. We'll add a few more days before that streak finally ends early next week
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Through yesterday, January is tracking as the 2nd-warmest since 1950 from a national gas-weighted HDD perspective (514 vs. normal 664 and record 511 in 2006). Cold in the West/Central in the final week takes us down a peg but still projected to finish at #3 warmest.
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You may recall that at one point last fall the Mississippi River was drying up in areas of the Mid-South, thankfully that is no longer the case (graphs here are at Memphis from mid-October vs. today)
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Much has been made of the moisture improvements in California (deservedly so), but check out how much drought/dryness have improved in the Midwest/South over the last few months droughtmonitor.unl.edu
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Thus far in climatological winter we've basically had three distinct periods--warm Dec 1-16 (12th-lowest GWHDDs since 1950), very cold Dec 17-27 (6th-highest GWHDDs since 1950), and very warm Dec 28-Jan 17 (lowest GWHDDs since 1950)
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We've not had a day with above normal (cold) national gas-weighted HDDs since Dec 27. The ensuing Dec 28-Jan 17 period yields the fewest GWHDDs on record since 1950 for the period (467.6 vs 30-year normal 630.0).
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Dallas reached a record high of 79° yesterday, now the city's 4th record high set this month
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Though there's still plenty of snow season left, and the pattern is turning drier for the rest of January, thus far this year is outpacing the record 1982-83 winter for snow water content in the Sierras, particularly in the south (graph via )
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Charts via , check out how much California's reservoir levels have increased since Christmas Day! California's largest reservoir, Lake Shasta, has increased from 32% total capacity to 52%, while Lake Oroville is now right above the historical average for the date.
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Here's the view this AM from rammb-slider.cira.colostate.edu of the powerful storm that will be bringing flooding rains, strong winds, and heavy mountain snow to California over the next couple of days
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Yesterday marked the end of a stretch of above normal national Gas-Weighted HDDs that lasted from Dec 17-27. The total of 387 GWHDDs in that period ranked 6th-highest for the period since 1950, and the peak of 44.0 GWHDDs on Xmas Eve was the 14th-coldest December day since 1950.
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Despite the brief reprieve from precipitation today, the next seven days will be active across the West as several waves of moisture produce widespread 2-6" rainfall totals in coastal portions of the region, with higher terrain expected to receive several feet of snow. 🌧️❄️
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The same is true of NYC-Central Park (58°/8°)
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Yesterday Philadelphia had a high of 59° (at 3AM) and a low of 9° (right before midnight). That 50° spread between max/min is the largest on record for the city dating back to 1941, edging out 48° (61°/13°) on Jan 9, 1978 (data via mesonet.agron.iastate.edu/plotting/auto)
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A record low temperature of -5 Fahrenheit was set at Pittsburgh today. This breaks the old daily record of -3 set in 1960.
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Wow. I just noticed this but wind stress across the length of the Lake Erie has piled water up towards the east end but look at how much the water level has dropped on its west end. That is unreal. This could be something to watch.
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Serious situation developing as nearly 70,000 customers without power across Vermont – hours away from subzero wind chills #vtwx
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It could be worse. Currently in Buffalo:
Heavy snow
16°
Wind SW 40, G 67 mph
Visibility 0.06 miles
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Current wind chill and 24-hour wind chill change. The noon wind chill in Cleveland is -34° (-4° temp with 37 mph winds), that is an incredible 74°(!) colder than the noon wind chill yesterday (40°).
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The temperature at Nashville has dropped to -1°F. This is the first time we've been below zero since 2/5/1996. However, the record low for this date is -8°F (1989), so that's safe.
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BIG-TIME SEICHE storm surge flooding at Buffalo Naval Park with winds over 60 mph. Dangerous #blizzard conditions
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Over 1.18 million electric customers are without power across the USA due a large winter storm system moving across the country. [2022-12-23 09:43:40 AM EST] poweroutage.us #PowerOutage
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An utterly otherworldly scene as the arctic air meets the Gulf of Mexico generating steam fog and convection! The cloud layer shows just how shallow the depth of the cold air is! #txwx #glswx #texasfreeze #timelapse #galveston
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Another one for the history books: a 37°F drop in 4 hours is the fastest at since at least 1945!
#PAwx
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Lost in the headlines amid the extreme cold/blizzard/wind/flash freeze/etc. across the eastern 2/3 of the US, the Pacific Northwest is also dealing with a major ice storm, upwards of 1" of icing possible in the lower Columbia River Valley
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Between 0.33" and 0.50" of ice accretion. Unreal icing/freezing rain conditions here just west of SeaTac, WA. #wawx
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Those 60-70 mph being forecast by NWS for the last couple of days in New England are verifying (KBTV is Burlington, VT)
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KBTV just gusted to 70 MPH – the second highest wind gust ever recorded there!
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With an average temperature of -15°, yesterday was Denver's 2nd-coldest day on record by that metric
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Actual wind chills:
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Here is the current 24-hour change in wind chill, I don't think I've ever seen a -60° on this map let alone several of them
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Will be curious what the official low in Denver was this morning--5-minute obs (which are Celsius rounded, so sometimes off by a degree or two) say -24° which would be one of the coldest on record (though a degree shy of today's record)
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All-time record low of -42° in Casper WY this morning! (assuming it's not instrumentation error--it has been reporting an erroneous dew point for several hours)
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Automated
RIW issues Record Event Report (RER) at Dec 22, 5:00 AM MST ...ALL-TIME RECORD LOW TEMPERATURE AT CASPER WYOMING... mesonet.agron.iastate.edu/p.php?pid=2022
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If you're searching for the cold front this morning, Oklahoma would be a good place to look (map via )
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ICYMI, some locales in the Rockies saw some of their greatest one-hour temperature changes on record yesterday as a potent arctic front pushed through. It was also one of the largest daily diurnal spreads on record for many. Graphs via mesonet.agron.iastate.edu/plotting/auto
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We'll see if it's legit--the dew point sensor is definitely erroneous with its reading of -76° but the temp seems possible even though most nearby coop stations are "only" in the low -30°s
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Unbelievable: Casper, WY is currently at -40° for just the 5th time on record
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Map of projected wind gusts from NWS thru Friday evening, lots of places seeing gusts of 30-50 mph with higher gusts in New England and in the Rockies
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