Alert archive / Maryland / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 310, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 22, 2011, 3:07 PM EDT for Frederick County, Washington County, Maryland. It was in force for 45 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 22, 2011, 3:07 PM EDT (19:07 UTC)
- Expired
- Jul 22, 2011, 3:52 PM EDT
- In force
- 45 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
Counties Frederick County, MD, Washington County, MD
The radar
The Sterling radar (KLWX), 66 km from the middle of the area, began a volume at 19:09 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 |
|---|---|---|---|
| Jul 22, 3:26 PM EDT | TSTM WND DMG | 3 Sse Wolfsville, MD | A COUPLE OF TREES WERE DOWN ALONG ROUTE 17 NEAR MEETINGHOUSE ROAD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.1 hours before the alert went out and 70 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
- 2227 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 1296 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
564 WUUS51 KLWX 221907 RRA SVRLWX MDC021-043-222015- /O.NEW.KLWX.SV.W.0310.110722T1907Z-110722T2015Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 307 PM EDT FRI JUL 22 2011 THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN WASHINGTON COUNTY IN NORTH CENTRAL MARYLAND... CENTRAL FREDERICK COUNTY IN NORTH CENTRAL MARYLAND... * UNTIL 415 PM EDT * AT 304 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR BOONSBORO...OR 8 MILES SOUTHEAST OF HAGERSTOWN...AND MOVING EAST AT 5 MPH. * LOCATIONS IMPACTED INCLUDE... WOLFSVILLE... THURMONT... PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WIND GUSTS AND FREQUENT CLOUD TO GROUND LIGHTNING. MOVE INDOORS TO A STURDY BUILDING AND STAY AWAY FROM WINDOWS. && LAT...LON 3966 7737 3945 7736 3948 7771 3961 7771 TIME...MOT...LOC 1908Z 270DEG 3KT 3955 7761 $$ SMZ
2 follow-up statements
896 WWUS51 KLWX 221923 SVSLWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 323 PM EDT FRI JUL 22 2011 MDC021-043-222015- /O.CON.KLWX.SV.W.0310.000000T0000Z-110722T2015Z/ WASHINGTON MD-FREDERICK MD- 323 PM EDT FRI JUL 22 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT FOR FREDERICK AND WASHINGTON COUNTIES... AT 322 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR WOLFSVILLE...OR 9 MILES SOUTHEAST OF HAGERSTOWN...MOVING EAST AT 5 MPH. LOCATIONS IMPACTED INCLUDE... MYERSVILLE... WOLFSVILLE... LEWISTOWN... THURMONT... BLOOMFIELD... PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WIND GUSTS AND FREQUENT CLOUD TO GROUND LIGHTNING. MOVE INDOORS TO A STURDY BUILDING AND STAY AWAY FROM WINDOWS. && LAT...LON 3965 7740 3947 7739 3949 7762 3960 7762 TIME...MOT...LOC 1924Z 270DEG 6KT 3956 7757 $$ SMZ
389 WWUS51 KLWX 221952 SVSLWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 352 PM EDT FRI JUL 22 2011 MDC021-043-222003- /O.CAN.KLWX.SV.W.0310.000000T0000Z-110722T2015Z/ WASHINGTON MD-FREDERICK MD- 352 PM EDT FRI JUL 22 2011 ...THE SEVERE THUNDERSTORM WARNING IS CANCELLED FOR FREDERICK AND WASHINGTON COUNTIES... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS. THUS THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED. LAT...LON 3965 7740 3947 7739 3949 7762 3960 7762 TIME...MOT...LOC 1953Z 270DEG 6KT 3956 7751 $$ JRK
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 2:00 PM EDT | Special Weather Statement | LWX | Washington | 30 min |
| Jul 22, 2:07 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 38 min |
| Jul 22, 2:07 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 38 min |
| Jul 22, 2:43 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 47 min |
| Jul 22, 2:56 PM EDT | Flash Flood Warning | LWX | Washington | 106 min |
| Jul 22, 3:07 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 38 min |
| Jul 22, 3:15 PM EDT | Special Weather Statement | LWX | Allegany | 30 min |
| Jul 22, 3:28 PM EDT | Special Weather Statement | LWX | Frederick | 32 min |
| Jul 22, 3:33 PM EDT | Special Weather Statement | LWX | Washington | 27 min |
| Jul 22, 4:26 PM EDT | Special Weather Statement | LWX | Montgomery | 19 min |
| Jul 22, 4:30 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 45 min |
| Jul 22, 7:35 PM EDT | Special Weather Statement | LWX | Allegany | 20 min |
| Jul 22, 7:59 PM EDT | Special Weather Statement | LWX | Allegany | 16 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2011Every severe thunderstorm warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.