Alert archive / Pennsylvania / Snow Squall Warnings in 2020
Snow Squall Warning 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this snow squall warning at Jan 8, 2020, 7:44 AM EST for Chester County, Pennsylvania; New Castle County, Delaware; Cecil County, Maryland. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jan 8, 2020, 7:44 AM EST (12:44 UTC)
- Expired
- Jan 8, 2020, 8:30 AM EST
- In force
- 46 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties New Castle County, DE, Cecil County, MD, Chester County, PA
The radar
The Dover AFB radar (KDOX), 89 km from the middle of the area, began a volume at 12:46 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.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 0.7 hours before the alert went out and 159 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1404 m above ground
- 0-6 km bulk shear
- 103 kt
- 0-1 km storm-relative helicity
- 348 m²/s²
- 0-3 km storm-relative helicity
- 424 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
391
WWUS51 KPHI 081245
SQWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Mount Holly NJ
744 AM EST Wed Jan 8 2020
DEC003-MDC015-PAC029-081330-
/O.NEW.KPHI.SQ.W.0001.200108T1244Z-200108T1330Z/
New Castle DE-Cecil MD-Chester PA-
744 AM EST Wed Jan 8 2020
The National Weather Service in Mount Holly NJ has issued a
* Snow Squall Warning for...
New Castle County in northern Delaware...
Cecil County in northeastern Maryland...
Southwestern Chester County in southeastern Pennsylvania...
* Until 830 AM EST.
* At 744 AM EST, a dangerous snow squall was located near Bel Air
North, or 11 miles northwest of Aberdeen, moving east at 65 mph.
HAZARD...Extremely poor visibility in heavy snow.
SOURCE...Radar indicated.
IMPACT...Dangerous life-threatening travel.
* This includes the following highways...
Interstate 95 in Maryland between mile markers 91 and 109.
Interstate 95 in Delaware between mile markers 0 and 16.
Locations impacted include...
Wilmington, Newark, Middletown, Elkton, Calvert, Elsmere, Kennett
Square, New Castle, Oxford, North East, West Grove, Rising Sun,
Delaware City, Charlestown, Newport, Cecilton, Glen Roy, Blake,
Stanton and Glasgow.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.
&&
LAT...LON 3972 7623 3973 7610 3989 7598 3990 7558
3986 7560 3984 7555 3966 7553 3962 7556
3960 7554 3960 7552 3946 7554 3945 7550
3934 7548 3936 7551 3934 7556 3938 7578
3938 7592 3941 7601 3952 7598 3955 7608
TIME...MOT...LOC 1244Z 281DEG 59KT 3963 7633
$$
JEO2 follow-up statements
048
WWUS51 KPHI 081311
SQWPHI
Snow Squall Warning
National Weather Service Mount Holly NJ
810 AM EST Wed Jan 8 2020
DEC003-MDC015-PAC029-081330-
/O.CON.KPHI.SQ.W.0001.000000T0000Z-200108T1330Z/
New Castle DE-Cecil MD-Chester PA-
810 AM EST Wed Jan 8 2020
...A SNOW SQUALL WARNING REMAINS IN EFFECT UNTIL 830 AM EST FOR NEW
CASTLE...CECIL AND SOUTHWESTERN CHESTER COUNTIES...
At 810 AM EST, a dangerous snow squall was located over Brantwood,
or near Elkton, moving east at 70 mph. This squall has a history of
producing 1 to 2 inches of snow in less than one hour. Roads will
rapidly become snow covered.
HAZARD...Extremely poor visibility in heavy snow.
SOURCE...Radar indicated.
IMPACT...Dangerous life-threatening travel.
This includes the following highways...
Interstate 95 in Maryland between mile markers 91 and 109.
Interstate 95 in Delaware between mile markers 0 and 16.
Locations impacted include...
Wilmington, Newark, Middletown, Elkton, Calvert, Elsmere, Kennett
Square, New Castle, Oxford, North East, West Grove, Rising Sun,
Delaware City, Charlestown, Newport, Cecilton, Glen Roy, Blake,
Stanton and Glasgow.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.
&&
LAT...LON 3972 7623 3973 7610 3989 7598 3990 7558
3986 7560 3984 7555 3966 7553 3962 7556
3960 7554 3960 7552 3946 7554 3945 7550
3934 7548 3936 7551 3934 7556 3938 7578
3938 7592 3941 7601 3952 7598 3955 7608
TIME...MOT...LOC 1310Z 281DEG 59KT 3955 7579
$$
JEO250
WWUS51 KPHI 081326
SQWPHI
Snow Squall Warning
National Weather Service Mount Holly NJ
825 AM EST Wed Jan 8 2020
DEC003-MDC015-PAC029-081335-
/O.EXP.KPHI.SQ.W.0001.000000T0000Z-200108T1330Z/
New Castle DE-Cecil MD-Chester PA-
825 AM EST Wed Jan 8 2020
...THE SNOW SQUALL WARNING FOR NEW CASTLE...CECIL AND SOUTHWESTERN
CHESTER COUNTIES WILL EXPIRE AT 830 AM EST...
The snow squall which prompted the warning has moved out of the
warned area. Therefore, the snow squall warning will be allowed to
expire. Roads will remain snow covered.
LAT...LON 3972 7623 3973 7610 3989 7598 3990 7558
3986 7560 3984 7555 3966 7553 3962 7556
3960 7554 3960 7552 3946 7554 3945 7550
3934 7548 3936 7551 3934 7556 3938 7578
3938 7592 3941 7601 3952 7598 3955 7608
TIME...MOT...LOC 1325Z 281DEG 59KT 3952 7557
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 8, 7:49 AM EST | Snow Squall Warning | PHI | Carbon, Monroe, Northampton | 41 min |
| Jan 8, 8:28 AM EST | Snow Squall Warning | PHI | Berks, Bucks, Chester, Delaware, Montgomery | 47 min |
| Jan 8, 8:28 AM EST | Snow Squall Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 47 min |
| Jan 8, 8:30 AM EST | Snow Squall Warning | PHI | Monroe | 45 min |
| Jan 8, 11:25 AM EST | Snow Squall Warning | PHI | Berks | 35 min |
| Jan 8, 12:07 PM EST | Special Weather Statement | PHI | Montgomery | 23 min |
| Jan 8, 12:38 PM EST | Special Weather Statement | PHI | Montgomery, Philadelphia | 37 min |
| Jan 8, 12:49 PM EST | Snow Squall Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 26 min |
| Jan 8, 1:48 PM EST | Snow Squall Warning | PHI | Carbon, Monroe | 42 min |
| Jan 8, 2:05 PM EST | Special Weather Statement | PHI | Montgomery | 25 min |
| Jan 8, 2:32 PM EST | Special Weather Statement | PHI | Carbon, Northampton | 28 min |
| Jan 8, 2:33 PM EST | Special Weather Statement | PHI | Philadelphia | 27 min |
| Jan 8, 2:46 PM EST | Special Weather Statement | PHI | Berks | 44 min |
| Jan 8, 3:05 PM EST | Special Weather Statement | PHI | Northampton | 40 min |
| Jan 8, 9:19 AM EST | Special Weather Statement | PHI | New Castle | 26 min |
Nearby
Snow Squall Warnings in Pennsylvania, 2020Snow Squall Warnings in Delaware, 2020Snow Squall Warnings in Maryland, 2020Every snow squall warning in 2020
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; radar from the NEXRAD Level II archive.