Archive for April, 2010

April Chill … Near Record
April 29, 2010

It is the end of April and temperatures are running close to the bottom of the scale for the season.

Wednesday’s high temperature was only 59 degrees, 10 degrees below the seasonal average. It seemed colder with raw west winds averaging almost 12 mph and gusts as high as 37 mph. The Wednesday morning low was 34 degrees, 1 degree above the 1998 record.

Although Thursday should warm up a bit, morning temperatures will be close to record low levels again. The record low for April 29 is 33 degrees, set in 1874. The low temperature is forecast to be in  the mid to upper 30s in many areas away from the Bay.

The National Weather Service map above outlines areas under a Frost Advisory in a dark blue shade and areas under a Freeze Warning in light blue.

In sharp contrast, weekend temperatures heat up with forecast highs well into the 80s and lows in the 60s, once again approaching records, but at the other end of the scale.

John Collins

8th Anniversary of La Plata Tornado
April 28, 2010

Sunday Soaker … More Monday
April 26, 2010

Rainfall Sunday held off until the end of the day, due in part to clouds and cool temperatures north of a cool front. Baltimore’s high temperature on Sunday was 60 with most of the day spent in the 50s. South of the front, in Washington, temperatures were well into the 70s with afternoon sun.

When the rain came it fell with a vengeance in some areas.

Dover AFB doppler radar estimates of of rainfall Sunday night into Monday morning are in the 2-3 inch range from Frederick County eastward into Harford County. Most of that rain fell Sunday evening. Baltimore’s official recording station was south of the heavy rain band and recorded only .99 inches of rain on Sunday whereas the Weather Service gauge at the Inner Harbor recorded 1.44 inches and farther north on TV Hill the WBAL gauge collected 2.20 inches.

Severe storms Sunday night produced some large hail.

The green dots on the map above show the cluster of hail producing storms and the Weather Service list below supplies additional details.

Monday’s weather is not much of an improvement over Sunday. The warmer air has been pushed farther south and clouds dominate once again.

The Monday afternoon satellite image shows the cloud deck over northeast Maryland and the thunderstorm activity developing in the warmer, sunnier areas of northern Virginia.

The entire storm system is moving farther east.

The Weather Service Monday midday weather map shows the storm center in eastern Ohio with an occluded front reaching to  just west of Maryland and the stalled warm (stationary) front over the southern Chesapeake Bay.

The forecast map above is for Tuesday morning and shows the system progressing eastward.

John Collins

Severe Sunday?
April 25, 2010

So far, spring 2010 has not seen much in the way of thunderstorm activity in the region. In fact, April rainfall in general is way below the seasonal average. All of that could change today.

A major spring storm is rolling across the Midwest and Mid Atlantic region.

Yesterday, the system generated devastating tornadoes across Mississippi and Alabama.

Today, the severe potential is shifting to the east and north.

A slight risk for severe storm activity ranges from the Mid Atlantic through the Southeast.

The Ohio River Valley and parts of Maryland and Pennsylvania have been further targeted for an increased risk for storm development.

The Storm Prediction Center has outlined the area in blue above for an increased risk of severe thunderstorms with strong winds, large hail, and possibly tornadoes for Sunday afternoon and evening. A warm front will be strung out across the area and would provide the trigger mechanism and focal point for any activity. A WATCH may ultimately be issued to further define the risk.

Check in for updates on WBAL-TV 11 and on wbaltv.com. Our Interactive Radar can be particularly useful in tracking storms affecting your neighborhood.

John Collins

A satellite view of Eyjafallajokull
April 16, 2010

April Temperatures
April 12, 2010

After a week of record and near record warm temperatures last week, readings this week are expected to be closer to the seasonal average.

The graph above traces highs recorded at BWI-Marshall Airport last week and high temperatures forecast for the week ahead.

John Collins

March 2010 Review
April 8, 2010

To date, some memorable weather has occurred in 2010. February it was snow, March it was rain and so far April has been notable for warm temperatures.

A number of entries ago we covered the spectacular numbers for February. Now, a quick review of March.

  • 48.5         Average Temperature
  • +4.8         Degrees Above The 30 Year Average
  • 75              Warmest temperature (21st)
  • 29              Coldest Temperature (6th)
  • 5.53″         Total Precipitation
  • +1.6″         Surplus of Precipitation (Against 30 Year Average)
  • 2.31″         Greatest 24 Hour Precipitation (13th)
  • Trace        Total Snowfall (2nd & 3rd)

The graphs below were prepared by the National Weather Service at Sterling, Va.

John Collins

Stormy Thursday?
April 8, 2010

Summer-like weather has come to the Mid Atlantic region this week. Temperature records in Baltimore were broken on Monday and tied on Tuesday with unseasonably warm temperatures continuing on Wednesday. It looks like summertime type thunderstorms are likely to break out over the area on Thursday as a cold front in the Midwest moves eastward.

The satellite image above shows storms lined up along the front just east of the Mississippi River on Wednesday evening.

The forecast map above shows the expected position of the front and the resulting rain area early Thursday afternoon.Conditions will be favorable for the development of a few strong thunderstorms.

The chart above from the National Weather Service Storm Prediction Center outlines the area for potential severe storm development on Thursday. Most of Maryland falls in the “slight risk” area.

Considerably cooler air will follow the front. High temperatures on Friday will be in the upper 50s to near 60 degrees and Saturday morning lows are likely to be in the mid to upper 30s in many areas.

John Collins

Record Territory?
April 5, 2010

The area has experienced some very nice weather recently and the trend should continue for the next few days. Temperatures are expected to run at least 15-20 degrees above the seasonal average of the low 60s for daytime highs.

Will any records be tied or broken? It will be tough. Here is the records list for the early part of the week.Monday would appear the hold the best odds for nearing the record with the forecast calling for highs around 80 degrees. High temperatures Tuesday and Wednesday are expected to run in the 80s but the records are probably out of reach.

An interesting note … the last time temperatures made it into the 80s in Baltimore was October 9, 2009 when it hit 83 degrees.

John Collins