Alert archive / Connecticut / Flash Flood Warnings in 2018

Flash Flood Warning 3, NWS Boston/Norton, MA

July 3, 2018Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this flash flood warning at Jul 3, 2018, 5:23 PM EDT for Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut. It was in force for 74 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 3, 2018, 5:23 PM EDT (21:23 UTC)
Expired: Jul 3, 2018, 6:37 PM EDT
In force: 74 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT

The radar

The Brookhaven radar (KOKX), 98 km from the middle of the area, began a volume at 21:23 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.4 hours before the alert went out and 98 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 864 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 920 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

459 
WGUS51 KBOX 032123
FFWBOX
CTC003-013-015-032330-
/O.NEW.KBOX.FF.W.0003.180703T2123Z-180703T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
523 PM EDT TUE JUL 3 2018

The National Weather Service in Boston/Norton has issued a

* Flash Flood Warning for...
  West central Windham County in northern Connecticut...
  Southern Tolland County in northern Connecticut...
  Southeastern Hartford County in northern Connecticut...

* Until 730 PM EDT.

* At 522 PM EDT, doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Flash flooding is expected to 
  begin shortly.

* Some locations that will experience flooding include...
  Hartford, New Britain, Manchester, East Hartford, Glastonbury,
  Newington, Wethersfield, Mansfield, Farmington, Windham, Rocky
  Hill, Willimantic, Plainville, Coventry, Hebron, Marlborough,
  Columbia, Bolton, Andover and Chaplin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means that flooding will occur quickly, and
could be life threatening for those who try to drive through flooded
roads or underpasses. Find alternate routes. Those near small streams
need to get to higher ground immediately.

&&

LAT...LON 4168 7287 4181 7239 4179 7206 4170 7222
      4171 7224 4169 7227 4168 7227 4161 7240
      4162 7249 4165 7251 4164 7258

$$

KJC

1 follow-up statement

651 
WGUS71 KBOX 032237
FFSBOX

Flash Flood Statement
National Weather Service Boston/Norton MA
637 PM EDT TUE JUL 3 2018

CTC003-013-015-032246-
/O.CAN.KBOX.FF.W.0003.000000T0000Z-180703T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Windham CT-Tolland CT-Hartford CT-
637 PM EDT TUE JUL 3 2018

...THE FLASH FLOOD WARNING FOR WEST CENTRAL WINDHAM...SOUTHERN
TOLLAND AND SOUTHEASTERN HARTFORD COUNTIES IS CANCELLED...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

LAT...LON 4168 7287 4181 7239 4179 7206 4170 7222
      4171 7224 4169 7227 4168 7227 4161 7240
      4162 7249 4165 7251 4164 7258

$$

KJC

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 3, 5:08 PM EDT	Special Weather Statement	BOX		37 min

Nearby

Flash Flood Warnings in Connecticut, 2018 Every flash flood warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.