Alert archive / Maryland / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 2, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Mar 29, 1997, 12:01 PM EST for Frederick County, Maryland. It was in force for 59 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
- Mar 29, 1997, 12:01 PM EST (17:01 UTC)
- Expired
- Mar 29, 1997, 1:00 PM EST
- In force
- 59 min
- Issued by
- NWS Baltimore/Washington
- Area
- Whole counties
County Frederick County, MD
The radar
The Sterling radar (KLWX), 56 km from the middle of the area, began a volume at 17:00 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 |
|---|---|---|---|
| Mar 29, 12:15 PM EST | Hail 1.5 | Frederick, MD |
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
Wallops Is Stn, VA (KWAL), launched 12:00Z, 5.0 hours before the alert went out and 244 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
- 301 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 433 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 117 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KWBC 291701 RRA SVRWBC MDC021-291800- BULLETIN -IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE STERLING VA 1201 PM EST SAT MAR 29 1997 THE NATIONAL WEATHER SERVICE IN STERLING VA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 100 PM EST FOR PEOPLE IN THE FOLLOWING LOCATION... IN WEST CENTRAL MARYLAND ...NORTHERN FREDERICK COUNTY IN MARYLAND AT 1157 AM EST...A SEVERE THUNDERSTORM WAS INDICATED BY STERLING DOPPLER RADAR 14 MILES WEST OF THURMONT OR 6 MILES NORTHWEST OF PLEASANT WALK MOVING EAST AT 35 MPH. THIS STORM IS EXPECTED TO AFFECT THE FOLLOWING COMMUNITIES FROM 1157 AM EST TO 100 PM EST ... CASCADE...EMMITSBURG... FOXVILLE AND THURMONT. IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG BUILDING. DAMAGING WIND...HAIL OVER 1 INCH IN DIAMETER...VERY HEAVY RAIN AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HA*S PASSED. WOODCOCK/THEDE
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 29, 11:48 AM EST | Severe Thunderstorm Warning | LWX | Washington | 32 min |
| Mar 29, 1:25 PM EST | Severe Thunderstorm Warning | LWX | Charles | 45 min |
| Mar 29, 1:36 PM EST | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 64 min |
| Mar 29, 2:01 PM EST | Severe Thunderstorm Warning | LWX | Harford | 34 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 1997Every severe thunderstorm warning in 1997
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.