Alert archive / Massachusetts / Red Flag Warnings in 2021
Red Flag Warning 1, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this red flag warning at Mar 12, 2021, 1:30 PM EST for 13 counties in Massachusetts; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut; 5 counties in Rhode Island. It took effect at Mar 13, 2021, 7:00 AM EST. It was in force for 10 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Mar 12, 2021, 1:30 PM EST (18:30 UTC)
- In effect from
- Mar 13, 2021, 7:00 AM EST
- Expired
- Mar 13, 2021, 5:00 PM EST
- In force
- 10 hr
- Issued by
- NWS Boston/Norton, MA
Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Barnstable County, MA, Bristol County, MA, Dukes County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Nantucket County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI
The radar
The Boston radar (KBOX), 26 km from the middle of the area, began a volume at 18:31 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
Chatham, MA (KCHH), launched 12:00Z, 6.5 hours before the alert went out and 127 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 956 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- -110 m²/s²
- 0-3 km storm-relative helicity
- -118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
339 WWUS81 KBOX 121830 RFWBOX URGENT - FIRE WEATHER MESSAGE National Weather Service Boston/Norton MA 130 PM EST Fri Mar 12 2021 CTZ002>004-MAZ002>024-026-RIZ001>008-131100- /O.NEW.KBOX.FW.W.0001.210313T1200Z-210313T2200Z/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA- Eastern Franklin MA-Northern Worcester MA-Central Middlesex MA- Western Essex MA-Eastern Essex MA-Western Hampshire MA- Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA- Southern Worcester MA-Western Norfolk MA-Southeast Middlesex MA- Suffolk MA-Eastern Norfolk MA-Northern Bristol MA- Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA- Southern Plymouth MA-Barnstable MA-Dukes MA-Nantucket MA- Northern Middlesex MA-Northwest Providence RI- Southeast Providence RI-Western Kent RI-Eastern Kent RI- Bristol RI-Washington RI-Newport RI-Block Island RI- 130 PM EST Fri Mar 12 2021 ...RED FLAG WARNING IN EFFECT FROM 7 AM TO 5 PM EST SATURDAY FOR GUSTY NORTHWEST WINDS AND VERY LOW RELATIVE HUMIDITY ACROSS MUCH OF SOUTHERN NEW ENGLAND... The National Weather Service in Boston/Norton has issued a Red Flag Warning for gusty northwest winds and very low relative humidity, which is in effect from 7 AM to 5 PM EST Saturday. * AFFECTED AREA...North central and northeast Connecticut, all of Rhode Island, and Massachusetts from the east slopes of the Berkshires east through the remainder of the state, for locations where a snow pack no longer exists. * TIMING...Saturday morning through late afternoon. * WINDS...Northwest 15 to 25 mph with gusts up to 50 mph during Saturday morning. Winds diminishing by midday, to 10 to 15 mph with gusts to 25 to 30 mph. * RELATIVE HUMIDITY...Between 20 and 30 percent. * TEMPERATURES...Afternoon highs in the mid 30s to upper 40s, coolest along the east slopes of the Berkshires. * IMPACTS...Dry weather and gusty winds will result in critical fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. Any fires that start may spread rapidly and become difficult to extinguish. && $$ For more information from the National Weather Service visit http://weather.gov/box For the latest updates...please visit our webpage at www.weather.gov/boston You can follow us on Facebook at www.facebook.com/us.nationalweatherservice.boston.gov You can follow us on Twitter at @NWSBoston
3 follow-up statements
173 WWUS81 KBOX 130312 RFWBOX URGENT - FIRE WEATHER MESSAGE National Weather Service Boston/Norton MA 1012 PM EST Fri Mar 12 2021 CTZ002>004-MAZ002>024-026-RIZ001>008-131115- /O.CON.KBOX.FW.W.0001.210313T1200Z-210313T2200Z/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA- Eastern Franklin MA-Northern Worcester MA-Central Middlesex MA- Western Essex MA-Eastern Essex MA-Western Hampshire MA- Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA- Southern Worcester MA-Western Norfolk MA-Southeast Middlesex MA- Suffolk MA-Eastern Norfolk MA-Northern Bristol MA- Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA- Southern Plymouth MA-Barnstable MA-Dukes MA-Nantucket MA- Northern Middlesex MA-Northwest Providence RI- Southeast Providence RI-Western Kent RI-Eastern Kent RI- Bristol RI-Washington RI-Newport RI-Block Island RI- 1012 PM EST Fri Mar 12 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 7 AM TO 5 PM EST SATURDAY FOR GUSTY NORTHWEST WINDS AND VERY LOW RELATIVE HUMIDITY ACROSS MUCH OF SOUTHERN NEW ENGLAND... * AFFECTED AREA...North central and northeast Connecticut, all of Rhode Island, and Massachusetts from the east slopes of the Berkshires east through the remainder of the state, for locations where a snow pack no longer exists. * TIMING...Saturday morning through late afternoon. * WINDS...Northwest 15 to 25 mph with gusts up to 50 mph during Saturday morning. Winds diminishing by midday, to 10 to 15 mph with gusts to 25 to 30 mph. * RELATIVE HUMIDITY...Between 20 and 30 percent. * TEMPERATURES...Afternoon highs in the mid 30s to upper 40s, coolest along the east slopes of the Berkshires. * IMPACTS...Dry weather and gusty winds will result in critical fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. Any fires that start may spread rapidly and become difficult to extinguish. && $$
969 WWUS81 KBOX 130829 RFWBOX URGENT - FIRE WEATHER MESSAGE National Weather Service Boston/Norton MA 329 AM EST Sat Mar 13 2021 CTZ002>004-MAZ002>024-026-RIZ001>008-131630- /O.CON.KBOX.FW.W.0001.210313T1200Z-210313T2200Z/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA- Eastern Franklin MA-Northern Worcester MA-Central Middlesex MA- Western Essex MA-Eastern Essex MA-Western Hampshire MA- Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA- Southern Worcester MA-Western Norfolk MA-Southeast Middlesex MA- Suffolk MA-Eastern Norfolk MA-Northern Bristol MA- Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA- Southern Plymouth MA-Barnstable MA-Dukes MA-Nantucket MA- Northern Middlesex MA-Northwest Providence RI- Southeast Providence RI-Western Kent RI-Eastern Kent RI- Bristol RI-Washington RI-Newport RI-Block Island RI- 329 AM EST Sat Mar 13 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 7 AM THIS MORNING TO 5 PM EST THIS AFTERNOON FOR GUSTY NORTHWEST WINDS AND VERY LOW RELATIVE HUMIDITY ACROSS MUCH OF SOUTHERN NEW ENGLAND... * AFFECTED AREA...North central and northeast Connecticut, all of Rhode Island, and Massachusetts from the east slopes of the Berkshires east through the remainder of the state, for locations where a snow pack no longer exists. * TIMING...Through 5 PM this evening. * WINDS...Northwest 15 to 25 mph with gusts up to 40 mph this morning. Winds diminishing by midday, to 10 to 20 mph with gusts to 25 to 30 mph. * RELATIVE HUMIDITY...Between 15 and 25 percent. * TEMPERATURES...Afternoon highs in the 40s. * IMPACTS...Dry weather and gusty winds will result in critical fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. Any fires that start may spread rapidly and become difficult to extinguish. && $$ Frank
615 WWUS81 KBOX 131530 RFWBOX URGENT - FIRE WEATHER MESSAGE National Weather Service Boston/Norton MA 1030 AM EST Sat Mar 13 2021 CTZ002>004-MAZ002>024-026-RIZ001>008-132200- /O.CON.KBOX.FW.W.0001.000000T0000Z-210313T2200Z/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA- Eastern Franklin MA-Northern Worcester MA-Central Middlesex MA- Western Essex MA-Eastern Essex MA-Western Hampshire MA- Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA- Southern Worcester MA-Western Norfolk MA-Southeast Middlesex MA- Suffolk MA-Eastern Norfolk MA-Northern Bristol MA- Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA- Southern Plymouth MA-Barnstable MA-Dukes MA-Nantucket MA- Northern Middlesex MA-Northwest Providence RI- Southeast Providence RI-Western Kent RI-Eastern Kent RI- Bristol RI-Washington RI-Newport RI-Block Island RI- 1030 AM EST Sat Mar 13 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM EST THIS AFTERNOON FOR FOR GUSTY NORTHWEST WINDS AND VERY LOW RELATIVE HUMIDITY ACROSS MUCH OF SOUTHERN NEW ENGLAND... * AFFECTED AREA...North central and northeast Connecticut, all of Rhode Island, and Massachusetts from the east slopes of the Berkshires east through the remainder of the state, for locations where a snow pack no longer exists. * TIMING...Through 5 PM this evening. * WINDS...Northwest 15 to 25 mph with gusts up to 40 mph this morning. Winds diminishing by midday, to 10 to 20 mph with gusts to 25 to 30 mph. * RELATIVE HUMIDITY...Between 15 and 25 percent. * TEMPERATURES...Afternoon highs in the 40s. * IMPACTS...Dry weather and gusty winds will result in critical fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. Any fires that start may spread rapidly and become difficult to extinguish. && $$
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 2:53 AM EST | Wind Advisory | BOX | Barnstable, Bristol, Dukes, Essex, Franklin, Hampden and 7 more | 28 hr |
| Mar 12, 2:55 AM EST | Gale Warning | BOX | 33 hr |
Nearby
Red Flag Warnings in Massachusetts, 2021Red Flag Warnings in Rhode Island, 2021Red Flag Warnings in Connecticut, 2021Every red flag warning in 2021
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.