Alert archive / Virginia / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 39, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 1, 1990, 2:35 PM EDT for Fairfax County, Virginia. It was in force for 25 min. 3 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
- Jul 1, 1990, 2:35 PM EDT (18:35 UTC)
- Expired
- Jul 1, 1990, 3:00 PM EDT
- In force
- 25 min
- Issued by
- NWS Baltimore/Washington
- Area
- Whole counties
County Fairfax County, VA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 1, 2:35 PM EDT | Hail 0.75 | Fairfax, VA | |
| Jul 1, 3:00 PM EDT | Thunderstorm Wind 0 | Fairfax, VA | |
| Jul 1, 3:00 PM EDT | Thunderstorm Wind 0 | Fairfax, VA |
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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 6.6 hours before the alert went out and 17 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
- 147 J/kg
- Mixed-layer CIN
- -183 J/kg
- Mixed-layer LCL
- 1047 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 70 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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.
In the hours before
Special weather statement, Jul 1, 1:35 PM EDT, 1 hour before
MDZ001>007-011730 NATIONAL WEATHER SERVICE BALTIMORE MD SPECIAL WEATHER STATEMENT 130PM EDT SUN JUL 1 1990 ..SEVERE THUNDERSTORM WATCH IN EFFECT FOR MUCH OF CENTRAL AND WESTERN MARYLAND INCLDING THE BALTIMORE METRO AREA UNTIL 7PM EDT. AT 115PM EDT..WEATHER RADAR WAS INDICATING AN AREA OF SHOWERS AND THUND- ERSTORMS FROM SOUTHCENTRAL PENNSYLVANIA THROUGH FREDERICK AND WASHINGTON COUNTIES IN MARYLAND INTO WEST VIRGINIA. THERE ARE A COUPLE OF ISOLATED SHOWERS..RECENTLY DEVELOPED OVER WESTERN BALTIMORE AND CARROLL COUNTIES. ALL THE STORMS ARE MOVING SOUTHEAST AT ABOUT 25 TO 35 MILES PER HOUR. THIS AREA IS THE LEADING EDGE OF ACTIVITY WHICH HAS THE POTENTIAL TO PRODUCE LARGE HAIL..DAMAGIN#G WINDS AND DANGEROUS LIGHTNING. PERSONS OUT-OF-DOORS SHOULD BE PREPARED FOR THE POSSIBILITY OF RAPIDLY CHANGING WEATHER CONDITIONS AND TO TAKE APPROPRIATE ACTION IMMEDIATELY. FIGUEROA
Special weather statement, Jul 1, 2:11 PM EDT, 24 minutes before
MDZ001>007-011815 NATIONAL WEATHER SERVICE BALTIMORE MD SPECIAL WEATHER STATEMENT 210PM EDT SUN JUL 1 1990 ..STRONG THUNDERSTORMS MOVING INTO HOWARD AND CARROLL COUNTIES... AT 200PM EDT..WEATHER RADAR WAS INDICATING A VERY STRONG THUNDERSTORM MOVING SOUTHEAST FROM FREDERICK COUNTY AT ABOUT 35 MILES PER HOUR,THIS STORM IS MOVING ALONG THE MONTGOMERYAND HOWARD COUNTY LINE. THIS STORM MAY PRODUCE DAMAGING WINDS AND HAIL AS IT PASSES THROUGH THA`T AREA. PERSONS SHOULD BE PREPARED TO TAKE THE PROPER PRECAUTIONS AS THIS STORM APPROACHES. FIGUEROA
Special weather statement, Jul 1, 2:17 PM EDT, 18 minutes before
MDZ001>007-011815 NATIONAL WEATHER SERVICE BALTIMORE MD SPECIAL WEATHER STATEMENT 210PM EDT SUN JUL 1 1990 ..STRONG THUNDERSTORM MOVING INTO HOWARD AND MONTGOMERY COUNTIES.. AT 200PM EDT..WEATHER RADAR WAS INDICATING A VERY STRONG THUNDERSTORM MOVING SOUTHEAST FROM FREDERICK COUNTY AT ABOUT 35 MILES PER HOUR,THIS STORM IS MOVING ALONG THE MONTGOMERY AND HOWARD COUNTY LINE. THIS STORM MAY PRODUCE DAMAGING WINDS AND HAIL AS IT PASSES THROUGhH THAT AREA. PERSONS SHOULD BE PREPARED TO TAKE THE PROPER PRECAUTIONS AS THIS STORM APPROACHES. FIGUEROA
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 2:00 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 60 min |
| Jul 1, 2:59 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 61 min |
| Jul 1, 3:29 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Saint Mary's | 61 min |
| Jul 1, 3:50 PM EDT | Tornado Warning | LWX | Charles, Saint Mary's | 40 min |
| Jul 1, 5:05 PM EDT | Severe Thunderstorm Warning | LWX | Wicomico, Worcester | 55 min |
| Jun 30, 10:00 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 60 min |
| Jun 30, 11:02 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier | 58 min |
| Jul 1, 3:03 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier, Stafford | 57 min |
| Jul 1, 3:40 PM EDT | Severe Thunderstorm Warning | LWX | King George | 65 min |
Nearby
Severe Thunderstorm Warnings in Virginia, 1990Every severe thunderstorm warning in 1990
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.