Alert archive / Maryland / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 97, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 1, 2001, 6:43 PM EDT for Calvert County, Saint Mary's County, Maryland. It was in force for 47 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
- Jul 1, 2001, 6:43 PM EDT (22:43 UTC)
- Expired
- Jul 1, 2001, 7:30 PM EDT
- In force
- 47 min
- Issued by
- NWS Baltimore/Washington
- Area
- Whole counties
Counties Calvert County, MD, Saint Mary's County, MD
The radar
The Sterling radar (KLWX), 107 km from the middle of the area, began a volume at 22:44 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 1, 7:05 PM EDT | Thunderstorm Wind | Countywide, MD | Trees and wires were downed. |
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 |
|---|---|---|---|
| Jul 1, 6:30 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.7 hours before the alert went out and 99 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
- 737 J/kg
- Mixed-layer CIN
- -52 J/kg
- Mixed-layer LCL
- 1231 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.2
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 Jul 1, 2:35 PM EDT, 4 hours 8 minutes earlier.
Area forecast discussion, Jul 1, 2:35 PM EDT, 4 hours 8 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON 235 PM EDT SUN JUL 1 2001 KPBZ/KCCX RADARS SHOWING SOLID LINE OF THUNDERSTORMS SAGGING SLOWLY SOUTHWARD ACROSS CENTRAL PA. SEVERAL WARNINGS COMING OUT FROM OFFICES TO THE NORTH. 18Z ANALYSIS SHOWING COLD FRONT EXTENDING FROM EASTERN LAKE ONTARIO THROUGH CENTRAL OHIO. THIS COLD FRONT PROGGED BY 12Z ETA AND AVN TO MOVE THROUGH THE AREA DURING THE EARLY EVENING HOURS... AND 15Z RUC SHOWING NO DIFFERENCE IN THE TREND. ETA AND NOW THE RUC ARE HINTING THAT THE LINE OF STORMS TO THE NORTH WILL BREAK UP AS IT APPROACHES... DUE TO THE FACT THAT THE WIND FIELDS OVER OUR AREA ARE NOT NEARLY AS FAVORABLE AS THEY ARE TO THE NORTH AND THAT MAIN SHORT WAVE AND HEIGHT FALLS REMAIN OVER PA. STILL... UNSTABLE AMS IN PLACE WITH LI VALUES CURRENTLY IN THE -5 TO -7 RANGE. CONSIDERING STRENGTH OF SURFACE BOUNDARY... WOULD EXPECT THAT AT LEAST SCATTERED THUNDERSTORMS WOULD DEVELOP OVER OUR AREA DURING THE LATE AFTERNOON AND EARLY EVENING HOURS. FORECAST SOUNDINGS CONTINUE TO SHOW POTENTIAL FOR STRONG/SEVERE WIND GUSTS... WILL MENTION HARDER IN THE NORTH THAN THE SOUTH. CLEAR SKIES AND DRY AIR SHOULD WORK INTO THE AREA AFTER MIDNIGHT. NEXT COUPLE OF DAYS LOOK VERY PLEASANT. MAY SEE SOME LOWS IN THE 40S IN THE FAVORED VALLEYS OUT WEST MONDAY NIGHT. NEXT CHANCE OF PRECIP APPEARS TO BE LATE TUESDAY NIGHT IN THE WEST... AND WEDNESDAY THROUGH EARLY THURSDAY FOR THE ENTIRE AREA. WARM ADVECTION AND WEAK SHORT WAVE MOVING ACROSS THE WEST LATE TUESDAY NIGHT... FOLLOWED BY A COLD FRONT MOVING THROUGH THE AREA WEDNESDAY AFTERNOON. HIGH PRESSURE BUILDING IN BEHIND THIS SYSTEM RESULTING IN DRY WEATHER FOR THE REST OF THE EXTENDED. DCA 63 78 61 81 / 50 0 0 0 BWI 58 78 55 81 / 40 0 0 0 MRB 57 76 51 80 / 30 0 0 10 IAD 57 78 52 81 / 40 0 0 0 CHO 64 78 55 82 / 50 0 0 0 HGR 58 75 50 79 / 30 0 0 10 NHK 64 77 58 82 / 50 0 0 0 W99 57 78 50 82 / 40 0 0 10 .LWX... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...SCA FOR TIDAL POTOMAC AND MD PORTION OF CHESAPEAKE BAY. MARGRAF!
In the hours before
Special weather statement, Jul 1, 4:44 PM EDT, 1 hour 59 minutes before
DCZ001-MDZ002>007-009>011-013-014-VAZ021-026>031-040>042-052>054- WVZ048>055-020100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON 444 PM EDT SUN JUL 1 2001 SEVERE THUNDERSTORM WATCH NUMBER 492 IS IN EFFECT UNTIL 900 PM EDT FOR THE FOLLOWING AREAS... THE DISTRICT OF COLUMBIA IN MARYLAND... ALLEGANY...ANNE ARUNDEL...CARROLL...FREDERICK... HARFORD...HOWARD...MONTGOMERY...NORTHERN BALTIMORE...PRINCE GEORGES...SOUTHERN BALTIMORE AND WASHINGTON IN VIRGINIA... ARLINGTON/FALLS CHURCH/ALEXANDRIA...CLARKE... FAIRFAX...FAUQUIER...FREDERICK...HIGHLAND...LOUDOUN...PAGE...PRINCE WILLIAM/MANASSAS/MANASSAS PARK...RAPPAHANNOCK...ROCKINGHAM... SHENANDOAH AND WARREN IN WEST VIRGINIA... BERKELEY...GRANT...HAMPSHIRE...HARDY... JEFFERSON...MINERAL...MORGAN AND PENDLETON A LINE OF STRONG THUNDERSTORMS OVER SOUTHERN PENNSYLVANIA AND WESTERN MARYLAND WILL MOVE THROUGH THE WATCH AREA DURING THE LATE AFTERNOON AND EARLY EVENING HOURS. THE MAIN THREAT FROM THESE STORMS WILL BE DAMAGING WIND. VERY HEAVY DOWNPOURS AND LARGE HAIL ARE ALSO POSSIBLE. MARGRAF!
Special weather statement, Jul 1, 6:39 PM EDT, 4 minutes before
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</html>The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 4:51 PM EDT | Severe Thunderstorm Warning | LWX | Prince William, City of Manassas, City of Manassas Park | 39 min |
| Jul 1, 4:51 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier | 39 min |
| Jul 1, 5:28 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Prince William | 47 min |
| Jul 1, 5:28 PM EDT | Severe Thunderstorm Warning | LWX | City of Manassas | 47 min |
| Jul 1, 5:28 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier | 47 min |
| Jul 1, 6:14 PM EDT | Severe Thunderstorm Warning | LWX | Loudoun | 46 min |
| Jul 1, 3:49 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, City of Baltimore | 41 min |
| Jul 1, 3:49 PM EDT | Severe Thunderstorm Warning | LWX | Carroll | 41 min |
| Jul 1, 5:59 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 46 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.