Alert archive / Virginia / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 36, NWS Baltimore/Washington

June 30, 1990Frederick County, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 30, 1990, 10:00 PM EDT for Frederick County, Virginia. It was in force for 60 min.

The area

The counties it named.

The facts

Issued: Jun 30, 1990, 10:00 PM EDT (02:00 UTC)
Expired: Jun 30, 1990, 11:00 PM EDT
In force: 60 min
Issued by: NWS Baltimore/Washington
Area: Whole counties

County Frederick County, VA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 2.0 hours before the alert went out and 80 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1495 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 1431 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 5.0

Open this sounding in Storm Lab

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, Jun 30, 7:06 PM EDT, 2 hours 54 minutes before

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Special weather statement, Jun 30, 8:11 PM EDT, 1 hour 49 minutes before

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Special weather statement, Jun 30, 8:16 PM EDT, 1 hour 44 minutes before

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Special weather statement, Jun 30, 9:07 PM EDT, 53 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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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, 11:02 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier	58 min
Jul 1, 2:35 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax	25 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, 1990 Every 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; the sounding from the Mesonet's radiosonde archive.