Alert archive / Pennsylvania / Flash Flood Warnings in 1999

Flash Flood Warning 23, NWS State College, PA

January 24, 1999Huntingdon County, Pennsylvania

NWS State College, PA issued this flash flood warning at Jan 24, 1999, 11:59 AM EST for Huntingdon 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, 11:59 AM EST (16:59 UTC)
Expired
Jan 24, 1999, 4:00 PM EST
In force
4 hr
Issued by
NWS State College, PA
Area
Whole counties

County Huntingdon County, PA

The radar

The State College radar (KCCX), 56 km from the middle of the area, began a volume at 17:02 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

Pittsburgh, PA (KPIT), launched 12:00Z, 5.0 hours before the alert went out and 179 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, Pittsburgh, PA at 12:00Z on 1999-01-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Pittsburgh, PA at 12:00Z on 1999-01-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -66 square meters per square second.1939587897117136156Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
711 m above ground
0-6 km bulk shear
72 kt
0-1 km storm-relative helicity
-66 m²/s²
0-3 km storm-relative helicity
-201 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 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, 10:20 AM EST, 1 hour 39 minutes earlier.

Area forecast discussion, Jan 24, 10:20 AM EST, 1 hour 39 minutes before
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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, 3:58 AM ESTFlash Flood WarningCTPNorthumberland, Union4 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 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.