The Storm’s Over — The Numbers Are In

The dry air was the wild card. Radar showed moderate snow over all of Connecticut for hours-and-hours before anything hit the ground.

snow-shovel-on-the-steps.jpgThe snow has come and gone. There’s never a bullseye, but the forecast was reasonably close. If success is judged by number of complaints, or lack thereof, I’m doing fine. Here are the final DOT numbers. I have also added the Boston and New York NWS snow totals, which include Connecticut, for the Dec 20-21, 2009 storm at the end of this entry.

Not everyone was as lucky. A friend who forecasts in Springfield sent a text message saying he’d received nothing! “Bust of the decade,” he said. Ouch. Been there. I know exactly what he’s going through.

I was right about Southeastern Connecticut getting the most snow followed by the shoreline in general. The snow was fluffy and windblown as predicted. Accumulations were generally in line with my numbers. My call for the Northwest Hills and most of the area directly adjacent to the Massachusetts line was a few inches higher than the actual totals.

I wrote about this last night, but it bears repeating the most unusual and interesting part of this storm was the exceptionally dry air. During the summer we sometimes see 30 grams of water content per square meter. Last night it was around 1 gram per cubic meter!

The dry air was the wild card. Radar showed moderate snow over all of Connecticut for hours-and-hours before anything hit the ground. Once the atmospheric column over any location became saturated light snow turned to heavy snow. I’d never seen a situation quite like this before. It cut inches off all the accumulations.

It’s a shame this storm will impact Christmas shopping. Otherwise we’re lucky it came on a Saturday night when travel is usually light.

And now the dig out begins.

(NWS totals after the jump)

Continue reading “The Storm’s Over — The Numbers Are In”

Left hand, meet right hand

It was clear, early on, that Friday had a significant chance for severe weather. I was concerned that the computer models downplayed it somewhat. But Thursday, within a few hours of being run, they had already blown the forecast in Michigan… so the computers weren’t to be totally trusted.

A little activity started on Central New York State toward early afternoon and the Storm Prediction Center threw up a Severe Thunderstorm Watch for the entire state, effective until 8:00 PM.

That was the right call.

A little background. I forecast the weather. The folks I work with forecast the weather. My competitors forecast the weather. But, we all leave watches and warnings to the Weather Service. The idea is to present a coordinated front, so as not to be confusing. In my 20+ years in weather I have heard few dissent from this concept.

After a watch is posted, it is the job of the Taunton, MA National Weather Service Office to put out a ‘redefining’ statement for all of Connecticut (even though they normally only forecast for 3 of the 4 northern counties and none of the shoreline). These are needed because watches are parallelograms and they don’t evenly fit within state or county borders. Without the redefinition, a watch area might include a small sliver of a state or something else equally confusing.

Taunton’s original statement only included their counties.

WWUS61 KBOX 221719

SLSMA

WATCH COUNTY NOTIFICATION FOR WATCH #880

NATIONAL WEATHER SERVICE TAUNTON MA

120 PM EDT FRI AUG 22 2003

CTC003-013-015-MAC005-009-011-013-015-017-021-023-025-027-NHC005-011-

RIC001-003-005-007-009-230000-

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH

#880 UNTIL 800 PM EDT FRIDAY EVENING FOR THE FOLLOWING AREAS:

IN CONNECTICUT THIS WATCH INCLUDES 3 COUNTIES…

IN NORTHERN CONNECTICUT:

HARTFORD TOLLAND WINDHAM

Then a correction to include the whole state.

WWUS61 KBOX 221744 CCA

SLSMA

BULLETIN – IMMEDIATE BROADCAST REQUESTED

AREAL OUTLINE FOR SEVERE THUNDERSTORM WATCH NUMBER 880

NATIONAL WEATHER SERVICE TAUNTON MA …CORRECTION

143 PM EDT FRI AUG 22 2003

SEVERE THUNDERSTORM WATCH NUMBER 880 IN EFFECT UNTIL 800 PM EDT.

CTC001-003-005-007-009-011-013-015-230000-

IN CONNECTICUT THIS WATCH INCLUDES 8 COUNTIES

FAIRFIELD HARTFORD LITCHFIELD MIDDLESEX

NEW HAVEN NEW LONDON TOLLAND WINDHAM

ADJACENT COASTAL WATERS

But, by then the damage had been done. At the TV station our Weather Warn II computer was confused. It put up a Thunderstorm Watch and then alternated text for a “defined area” and mentioned the three original counties. If we would have aired it, it would have looked like the watch was only for three counties.

As I drove in, Kirk Varner, our news director (who reads this, I can’t blast him here), saw what was going on and basically shifted to manual. This system is supposed to work on its own, without intervention. At the moment, it can’t be trusted. But, thankfully, we had the right info on the screen.

Throughout the afternoon we saw scattered thunderstorms. They probably didn’t get to the ‘official’ severe limit, but were close enough to justify the watch box.

Thursday night, this same system had quieted down and then, with the watches expired, fired up. It even spawned tornadoes in Michigan on the ‘rebound.’

Tonight, the system again died down. And then a series of awful human judgment errors.

At 7:10 PM:

CTZ002>004-MAZ002>021-026-NHZ011-012-015-RIZ001>008-230000-

SPECIAL WEATHER STATEMENT

NATIONAL WEATHER SERVICE TAUNTON MA

710 PM EDT FRI AUG 22 2003

…PART OF THE SEVERE THUNDERSTORM WATCH IS NO LONGER IN EFFECT…

THE WATCH IS NO LONGER IN EFFECT FOR SOUTHWEST NEW HAMPSHIRE…

WESTERN…CENTRAL AND NORTHEAST MASSACHUSETTS…OR NORTHERN

CONNECTICUT. THUNDERSTORMS HAVE MOVED EAST OF THESE AREAS AND THE

THREAT OF SEVERE WEATHER HAS ENDED.

THE SEVERE THUNDERSTORM WATCH CONTINUES UNTIL 8 PM FOR RHODE ISLAND.

IT ALSO CONTINUES FOR SUFFOLK…NORFOLK…BRISTOL AND PLYMOUTH

COUNTIES IN EASTERN MASSACHUSETTS.

But, the threat hadn’t ended. All of a sudden, in Southern Windham County, the storms fired up rapidly and ferociously.

CTC015-RIC003-230015-

BULLETIN – EAS ACTIVATION REQUESTED

SEVERE THUNDERSTORM WARNING

NATIONAL WEATHER SERVICE TAUNTON MA

751 PM EDT FRI AUG 22 2003

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR…

WESTERN KENT COUNTY IN RHODE ISLAND

SOUTHEASTERN WINDHAM COUNTY IN NORTHERN CONNECTICUT

INCLUDING PLAINFIELD

* UNTIL 815 PM.

* AT 747 PM…NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

SEVERE THUNDERSTORM OVER PLAINFIELD…MOVING EAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR…

COVENTRY AROUND 810 PM

WEST GREENWICH AROUND 815 PM.

SEVERE THUNDERSTORMS PRODUCE LARGE HAIL AND/OR WIND STRONG ENOUGH TO

KNOCK DOWN TREES AND POWER LINES. MOVE INDOORS AND STAY AWAY FROM

WINDOWS.

But, in Connecticut, these storms weren’t just over Windham County. They had crossed the border to New London County. In fact, by the time the warning went up, Northern New London County was seeing more action than Windham.

Windham County gets its warnings from Taunton, MA. New London County gets them from Upton, NY. No warning went up for New London County.

If there was reason for warning Windham County, there was reason for a warning to be issued for New London. This lack of coordination is a problem we face a few times a year, at the least.

At 7:51 PM, the watch and warning configuration in Connecticut was out of whack with what was actually happening. This system is supposed prepare and inform. It was confusing.

Thunderstorms continued, though weaker, until sometime past 10:00. Saturday will be a totally different weather animal – cooler and fresher.

I am not happy with what went on Friday. In many ways, I am powerless to change things unless I start ‘buying out’ of the unified watch and warning scenario.

I don’t think I’m ready for that… but I’m close.

——-

By the way, at 4:21 PM the dew point a Meriden, CT (KMMK) reached an unbelievable 79°! I can’t ever remember seeing a dew point that high in Connecticut.