Alert archive / Maryland / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 65, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 12, 2001, 7:20 PM EDT for Carroll County, Maryland. It was in force for 40 min. 2 reports 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
- Jun 12, 2001, 7:20 PM EDT (23:20 UTC)
- Expired
- Jun 12, 2001, 8:00 PM EDT
- In force
- 40 min
- Issued by
- NWS Baltimore/Washington
- Area
- Whole counties
County Carroll County, MD
The radar
The Sterling radar (KLWX), 77 km from the middle of the area, began a volume at 23:22 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 12, 7:45 PM EDT | Thunderstorm Wind | Northeast Portion, MD | A microburst estimated between 60 and 70 MPH downed trees and power lines. |
| Jun 12, 7:50 PM EDT | Hail 0.75 | Manchester, MD | Dime sized hail fell. |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 12, 3:30 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.3 hours before the alert went out and 76 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
- 290 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 1099 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Baltimore/Washington wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 12, 3:00 PM EDT, 4 hours 20 minutes earlier.
Area forecast discussion, Jun 12, 3:00 PM EDT, 4 hours 20 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON 300 PM EDT TUE JUN 12 2001 WITH TEMPS IN THE LOWER 90 AND DEW POINTS AROUND 70. HEAT INDICES WILL RANGE BETWEEN 95 TO 100 DEGREES. SO HAVE ISSUED HEAT ADVISORY FOR CWA FOR WEDNESDAY. THE CWA WILL BE SQUEEZED BETWEEN EVENING CONVECTION TO THE NORTH AND WEST AND THE REMNANTS OF ALLISON TO THE SOUTH. AS ALLISON MOVES NE IT SHOULD SLOW AS HIGH PRESSURE BUILDS TO THE NORTH. IN ADDITION REMNANTS OF MCS/CONV ACTVTY OVR THE GRT LKS AND VCNTY MAY ALSO AFFECT THE CWA. BY LATE WED A WEAKENING H5 IMPULSE PASS TO THE NORTH IN WEAK NW FLOW OF BLDG UPR RDG. SO WILL INCREASE CLOUDS AND KEEP LOW POPS OF PCPN INTO FRIDAY IN MOST LOCATIONS. A WEAK COLD FRONT IS PROGED OVER THE WEEKEND SO WILL KEEP A SLIGHTLY COOLER AND MOSTLY DRY IN THE EXTENDED. FCSTID = 17 DCA 68 91 68 86 / 20 30 30 30 BWI 68 91 68 87 / 20 30 30 30 MRB 65 91 67 87 / 20 30 30 30 IAD 68 91 68 87 / 20 30 30 30 CHO 65 90 65 85 / 20 30 30 30 HGR 65 91 67 87 / 20 30 30 30 NHK 68 90 68 87 / 20 30 30 30 .LWX... DC...HEAT ADVISORY FOR WEDNESDAY FOR ZONE DCZ001. MD...HEAT ADVISORY FOR WEDNESDAY FOR ZONES MDZ002>007...MDZ009>011...MDZ013>014...MDZ016>018. VA...HEAT ADVISORY FOR WEDNESDAY FOR ZONES VAZ021...VAZ025>031...VAZ036>042...VAZ050>057. WV...HEAT ADVISORY FOR WEDNESDAY FOR ZONES WVZ048>055.
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 5:30 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 30 min |
| Jun 12, 7:49 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore | 41 min |
| Jun 12, 4:33 PM EDT | Severe Thunderstorm Warning | LWX | Morgan | 42 min |
| Jun 12, 6:02 PM EDT | Severe Thunderstorm Warning | LWX | Berkeley | 28 min |
| Jun 12, 6:25 PM EDT | Severe Thunderstorm Warning | LWX | Jefferson | 35 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2001Every severe thunderstorm warning in 2001
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; radar from the NEXRAD Level II archive.