Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 142, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at Jul 30, 1999, 7:23 PM EDT for Cumberland County, Pennsylvania. It was in force for 67 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 30, 1999, 7:23 PM EDT (23:23 UTC)
- Expired
- Jul 30, 1999, 8:30 PM EDT
- In force
- 67 min
- Issued by
- NWS State College, PA
- Area
- Whole counties
County Cumberland County, PA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 30, 7:40 PM EDT | Thunderstorm Wind | Carlisle, PA | A tree fell onto a house. |
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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.4 hours before the alert went out and 135 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
- 1233 J/kg
- Mixed-layer CIN
- -113 J/kg
- Mixed-layer LCL
- 1423 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 14.0
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 State College, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 30, 1:45 PM EDT, 5 hours 38 minutes earlier.
Area forecast discussion, Jul 30, 1:45 PM EDT, 5 hours 38 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 145 PM EDT FRI JUL 30 1999 ...WRK ZONES BY 250 PM... ...ZONES BY 355 PM... ...CHANGES... WILL KEEP FCST CLOSE TO WHAT WE HAVE NOW...BUT UP TEMPS TONIGHT...GIVEN WHAT DEWPOINTS ARE ALREADY. MOST LIKELY WILL HAVE A MENTION OF STORMS EARLY TONIGHT FOR EASTERN AREAS...MAYBE WESTERN AREAS. WILL ADD CHC POPS FOR LATE WED. ...DISC... WARM FRONT FROM C NY...SOUTHWARD TO E PA. CONVECTION DID FIRE OVER SW NY AND DROP SE...AS EXPECTED. ONE THING I DID NOT EXPECT WAS THAT ACTION COULD GET INTO LOWER SUSQUEHANNA VLY THIS AM. ANYWAY...LEADING EDGE OF THE HIGHER DEWPOINTS WORKING IN FROM THE WEST. LIKE IN 1995...THEY CAN COME UP HIGH...EVEN WITH W FLOW. WAS THINKING ABOUT A HEAT ADVISORY FOR SE PORTION OF CWA...FOR TODAY INTO SAT...AS WAS CONCERN THAT FCST DEWPOINTS WERE TOO LOW...BUT WILL HOLD OFF FOR NOW...BUT WILL KEEP AN EYE ON THIS. WOULD LIKE TO SEE MORE OF A CAP. WHILE BEST CHC WILL BE EASTERN AREAS...ACCAS NOTED TO THE WEST. AIRMASS QUITE UNSTABLE AT 12Z. DECIDED ON AM PACKAGE NOT TO PUT STORMS IN NW AREAS THIS AFT. NOT REAL CONCERN ABOUT SEVERE...BUT WILL HAVE TO WATCH FOR ANY STORM THAT CAN FIRE NEAR ANY LAKE BREEZE...AS THEY COULD DROP SE AND FIRE OFF MORE STORMS...AS WAS THE CASE IN 1995...GIVEN THE EXTREMELY HIGH DEWPOINTS TO THE W. MY THOUGHTS FROM THE AM DISC...ABOVE...ARE STILL IN LINE WITH WHAT I SEE. DEWPOINTS IN THE EXTREME RANGE CONTINUE TO ADVECT EASTWARD. FWC DEWPOINT FCST TOO LOW THIS AFT. AIRMASS IS BARELY CAPPED OFF TO THE WEST. CAP JUST HOLDS IT DOWN TILL IT IS MORE DANGEROUS ANYWAY. AIRMASS JUST LIKE A CAN OF GAS...IF MOTHER NATURE THROWS A MATCH IN IT...WATCH OUT. CURRENT CONCERN IS THE LAKES AREA... CONVECTION FIRING FAST OVER ONTARIO...COULD DROP SE ALONG TROUGH LINE INTO N PA. ANYWAY...LOOKS LIKE FRONT MOVES IN SUNDAY. N PA...ESP. NW PA... COULD GET CLIPPED LATE SAT NIGHT BY ANYTHING THAT DROPS SE FROM SOUTHERN CANADA...W NY ETC. SAT AFT...STILL NOT CLEAR CUT...MODELS HINT AT A WEAKNESS OVER THE OHIO VLY...LIKE A SECORDARY WARM FRONT...MOST LIKELY THE LEADING EDGE OF THE EXTREME DEWPOINTS. COULD TOUCH OFF A STORM DURING THE AFTERNOON HOURS. WILL LEAVE OUT OF THE FCST...EXCEPT FOR JST AREA ...AS IT IS ALREADY IN FCST. ETA IS FASTER...AND DROPS PRESSURE FAST...AS LOW MOVES DOWN THE ST. LAWRENCE RIVER VLY. WILL NOT GO TOO FAST WITH PCPN AND >FROPA. .CTP...NONE. MARTIN
In the hours before
Local storm report, Jul 30, 2:28 PM EDT, 4 hours 55 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
228 PM EDT FRI JUL 30 1999
TIME(EDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0220 PM MANSFIELD PA 1.5 INCH HAIL
07/30/99 TIOGA PING PONG BALL SIZE HAILLocal storm report, Jul 30, 6:05 PM EDT, 1 hour 18 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
605 PM EDT FRI JUL 30 1999
TIME(EDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0220 PM MANSFIELD PA 1.5 INCH HAIL
07/30/99 TIOGA PING PONG BALL SIZE HAIL
0325 PM MANSFIELD PA 1.0 INCH HAIL
07/30/99 TIOGA QUARTER SIZE HAIL
0341 PM MONTOURSVILLE PA .75 INCH HAIL
07/30/99 LYCOMING DIME SIZE HAIL
0350 PM WILLIAMSPORT PA 1.0 INCH HAIL
07/30/99 LYCOMING QUARTER SIZE HAIL
0405 PM MONTGOMERY PA 1.5 INCH HAIL
07/30/99 LYCOMING QUARTER SIZE HAIL
0434 PM WARRENSVILLE PA 1.75 INCH HAIL
07/30/99 LYCOMING GOLF BALL SIZE HAIL
0455 PM WILLIAMSPORT PA 1.75 INCH HAIL
07/30/99 LYCOMING GOLF BALL SIZE HAIL
0500 PM MONTGOMERY PA 1.75 INCH HAIL
07/30/99 LYCOMING GOLF BALL SIZE HAIL
0528 PM SELINSGROVE PA 1.75 INCH HAIL
07/30/99 SNYDER GOLF BALL SIZE HAIL
0530 PM NEW COLUMBIA PA 1.75 INCH HAIL
07/30/99 UNION GOLF BALL SIZE HAIL
0500 PM MILTON PA .75 INCH HAIL
07/30/99 NORTHUMBERLAND DIME SIZE HAIL
LA CORTEThe office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 1:59 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 61 min |
| Jul 30, 2:57 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 63 min |
| Jul 30, 3:40 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 80 min |
| Jul 30, 3:50 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland | 55 min |
| Jul 30, 3:56 PM EDT | Severe Thunderstorm Warning | CTP | Union | 64 min |
| Jul 30, 4:02 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 58 min |
| Jul 30, 4:19 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Perry | 71 min |
| Jul 30, 4:36 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland, Snyder | 69 min |
| Jul 30, 4:52 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Union | 83 min |
| Jul 30, 5:32 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin | 58 min |
| Jul 30, 6:00 PM EDT | Severe Thunderstorm Warning | CTP | Snyder, Union | 60 min |
| Jul 30, 6:17 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Perry | 73 min |
| Jul 30, 6:24 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin | 66 min |
| Jul 30, 7:05 PM EDT | Severe Thunderstorm Warning | CTP | York | 55 min |
| Jul 30, 7:32 PM EDT | Tornado Warning | CTP | York | 28 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1999Every severe thunderstorm warning in 1999
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.