Alert archive / Pennsylvania / Flash Flood Warnings in 1999

Flash Flood Warning 16, NWS State College, PA

January 24, 1999Northumberland County, Union County, Pennsylvania

NWS State College, PA issued this flash flood warning at Jan 24, 1999, 3:58 AM EST for Northumberland County, Union County, Pennsylvania. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jan 24, 1999, 3:58 AM EST (08:58 UTC)
Expired
Jan 24, 1999, 8:00 AM EST
In force
4 hr
Issued by
NWS State College, PA
Area
Whole counties

Counties Northumberland County, PA, Union County, PA

The radar

The State College radar (KCCX), 94 km from the middle of the area, began a volume at 09:02 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 00:00Z, 9.0 hours before the alert went out and 222 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-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 1999-01-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 28 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 1999-01-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 384 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
28 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
803 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
384 m²/s²
0-3 km storm-relative helicity
421 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KCTP 240859
FFWCTP
PAC097-119-241300-

BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
358 AM EST SUN JAN 24 1999

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A

* FLOOD WARNING FOR...
  UNION COUNTY IN CENTRAL PENNSYLVANIA.
  NORTHUMBERLAND COUNTY IN CENTRAL PENNSYLVANIA.

* UNTIL 800 AM EST.

* AT 400 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  RAIN CONTINUING ACROSS CENTRAL PENNSYLVANIA. THIS RAIN WILL
  CONTINUE THROUGH THE MORNING...AND MAY BE HEAVY AT TIMES.

* SMALL STREAMS AND CREEKS CONTINUE TO RISE...WITH SOME OUT OF
  THEIR BANKS. DRY RUN IN NORTHUMBERLAND COUNTY IS OUT OF ITS BANKS
  AND FLOODING A TRAILER COURT IN DELAWARE TOWNSHIP. ROUTE 45 IN
  MONTANDON...ALSO IN NORTHUMBERLAND COUNTY...IS CLOSED DUE TO
  FLOODING. BULL RUN IN LEWISBURG IS ALSO OUT OF ITS BANKS.
  ADDITIONAL RAIN THIS MORNING WILL ONLY ADD TO THE EXISTING
  FLOODING PROBLEMS.

DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!

.END/JUNG


&

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jan 24, 2:30 AM EST, 1 hour 28 minutes earlier.

Area forecast discussion, Jan 24, 2:30 AM EST, 1 hour 28 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
230 AM EST MON JAN 24 1999

...WORK ZONES WILL BE SENT BY 330 AM AS PHLADMCTP...
...ZONES TO FOLLOW BETWEEN BY 400 AM...

OTHER THAN TWO RIVER POINTS IN A FLOOD WARNING ATTM (HARPER/S
TAVERN AND HOGESTOWN)...HYDROLOGIC ACTIVITY MUCH QUIETER THAN LAST
NIGHT. ANTICIPATE DROPPING THE FLOOD WARNINGS EARLY TODAY. LOOK FOR
PHLFLSCTP TO ANNOUNCE THE END OF THE FLOOD WARNING. ALSO WILL BE
ISSUING AN EARLY MORNING RVS FOR OTHER HIGH FLOW POINTS ON THE SUSQ.

SNOW AHEAD OF CLIPPER SYSTEM WORKING INTO WESTERN PA ATTM. SNOW HAS
JUST STARTED IN BFD DURING THE PAST HOUR...WITH VSBY/S DOWN TO 4
MILES. EXPECT ACCUMULATING SNOWS WILL PROBABLY HOLD OFF TILL EARLY
MORNING IN MY CWA.

SHORTWAVE...SUPPORTED BY UPPER JET...WORKS ACROSS PA TODAY. THE
STATE REMAINS IN THE RIGHT EXIT REGION OF THE JET THROUGH THE
AFTERNOON... SO SNOW WILL LINGER THROUGH A GOOD PART OF THE DAY.
MODELS NOW IN PRETTY GOOD AGREEMENT WITH AROUND .10 LIQUID ACROSS
THE NORTH. THIS STILL MAY BE SOMEWHAT UNDERDONE...AS 6 HR PCPN PLOTS
IN LOWER MI SHOW .10 TO .25 INCHES. OROGRAPHIC ASCENT MAY ALSO HELP
TO GENERATE A LITTLE ADDITIONAL SNOW ACROSS THE NORTHERN MTS...SO
WILL GO WITH A 1 TO 3 INCH ACCUM THERE. WILL ALSO BUMP LAURELS UP TO
AROUND AN INCH. FARTHER SOUTH AND EAST...WILL TAPER SNOW TO SNOW
SHOWERS AND FINALLY JUST LOW CHANCE POPS IN THE LOWER SUSQ.

THINGS CLEAR TONIGHT AND TUESDAY AS HIGH BUILDS IN. WILL KEEP ZONES
MOSTLY SUNNY TUESDAY...AND ONLY MENTION INCREASING HIGH CLOUDS IN
THE NORTHWEST LATE IN THE DAY.

.CTP...NONE.

JUNG

The office that day

Everything else NWS State College, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 23, 7:32 PM ESTFlash Flood WarningCTPHuntingdon6 hr
Jan 23, 10:40 PM ESTFlash Flood WarningCTPCentre6 hr
Jan 23, 11:01 PM ESTFlash Flood WarningCTPJuniata, Mifflin6 hr
Jan 24, 1:58 AM ESTFlash Flood WarningCTPHuntingdon3 hr
Jan 24, 4:39 AM ESTFlash Flood WarningCTPCentre, Huntingdon, Juniata, Mifflin3 hr
Jan 24, 7:51 AM ESTFlash Flood WarningCTPCentre4 hr
Jan 24, 7:51 AM ESTFlash Flood WarningCTPJuniata4 hr
Jan 24, 8:00 AM ESTFlash Flood WarningCTPColumbia, Northumberland4 hr
Jan 24, 8:00 AM ESTFlash Flood WarningCTPUnion4 hr
Jan 24, 9:23 AM ESTFlash Flood WarningCTPHuntingdon3 hr
Jan 24, 11:59 AM ESTFlash Flood WarningCTPHuntingdon4 hr
Jan 24, 11:59 AM ESTFlash Flood WarningCTPColumbia4 hr
Jan 24, 11:59 AM ESTFlash Flood WarningCTPUnion4 hr
Jan 24, 1:16 PM ESTFlash Flood WarningCTPLycoming3 hr

Nearby

Flash Flood Warnings in Pennsylvania, 1999Every flash flood 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.