Alert archive / Delaware / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 21, NWS Wilmington, NC
NWS Wilmington, NC issued this severe thunderstorm warning at Jul 26, 1987, 2:55 PM EDT for New Castle County, Delaware. It was in force for 65 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 26, 1987, 2:55 PM EDT (18:55 UTC)
- Expired
- Jul 26, 1987, 4:00 PM EDT
- In force
- 65 min
- Issued by
- NWS Wilmington, NC
- Area
- Whole counties
County New Castle County, DE
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 26, 3:30 PM EDT | Thunderstorm Wind 57 | New Castle, DE |
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
Atlantic City In, NJ (KACY), launched 12:00Z, 6.9 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
- 2642 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 1042 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.7
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KILG 261850 SVRILG DEC003-261945- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE WILMINGTON DE 255 PM EDT SUN JUL 26 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 4 PM EDT FOR PEOPLE IN THE FOLLOWING COUNTY... IN DELAWARE...NORTHERN NEW CASTLE AT 255 PM EDT WEATHER RADAR WAS SHOWING A LARGE CLUSTER OF VERY INTENSE THUNDERSTORMS ENTERING THE NORTHWESTERN PART OF NEW CASTLE COUNTY NEAR HOCKESSIN. THESE STORMS WILL MOVE EAST AND SOUTHEAST THROUGH THE NORTHERN HALF OF THE COUNTY DURING THE NEXT HOUR. THESE STORMS HAD PRODUCED HALF INCH HAIL AS THEY PASSED OVER PARTS OF SOUTHEASTERN PENNSYLVANIA. THESE ARE DANGEROUS STORMS. IF YOU ARE IN THEIR PATH YOU SHOULD PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDO2WS. LC
Nearby
Severe Thunderstorm Warnings in Delaware, 1987Every severe thunderstorm warning in 1987
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.