Alert archive / Maine / Tornado Warnings in 1999

Tornado Warning 1, NWS Caribou, ME

August 12, 1999Aroostook County, Penobscot County, Maine

NWS Caribou, ME issued this tornado warning at Aug 12, 1999, 4:26 PM EDT for Aroostook County, Penobscot County, Maine. It was in force for 49 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 12, 1999, 4:26 PM EDT (20:26 UTC)
Expired
Aug 12, 1999, 5:15 PM EDT
In force
49 min
Issued by
NWS Caribou, ME
Area
Whole counties

Counties Aroostook County, ME, Penobscot County, ME

What was reported inside it

TimeReportWhereRemark
Aug 12, 4:45 PM EDTThunderstorm Wind 50Shin Pond, MEA large tree was snapped off by the winds.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Caribou, ME (KCAR), launched 12:00Z, 8.4 hours before the alert went out and 105 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-pSkew-T log-p diagram, Caribou, ME at 12:00Z on 1999-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 31 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Caribou, ME at 12:00Z on 1999-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 76 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
31 J/kg
Mixed-layer CIN
-103 J/kg
Mixed-layer LCL
576 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
76 m²/s²
0-3 km storm-relative helicity
150 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KCAR 122028 RRA
TORCAR
MEC003-019-122115-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CARIBOU ME
426 PM EDT THU AUG 12 1999

THE NATIONAL WEATHER SERVICE IN CARIBOU HAS ISSUED A

* TORNADO WARNING FOR...
  AROOSTOOK COUNTY IN NORTHERN MAINE
  PENOBSCOT COUNTY IN NORTH CENTRAL MAINE
  
* UNTIL 515 PM EDT

* AT 427 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO 10 MILES SOUTH OF OXBOW...MOVING SOUTHEAST AT 30 MPFH..

  THE TORNADO WILL BE NORTH SHIN POND BY 445 PM AND KNOWLES CORNER
  BY 500 PM.

  GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR!

  JAH/LG

The office that day

Everything else NWS Caribou, ME issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 12, 2:59 PM EDTSevere Thunderstorm WarningCARAroostook31 min
Aug 12, 3:56 PM EDTSevere Thunderstorm WarningCARAroostook, Penobscot49 min
Aug 12, 5:29 PM EDTSevere Thunderstorm WarningCARAroostook46 min
Aug 12, 5:40 PM EDTFlash Flood WarningCARAroostook2 hr
Aug 12, 5:51 PM EDTTornado WarningCARAroostook49 min

Nearby

Tornado Warnings in Maine, 1999Every tornado warning in 1999Tornadoes in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.